CN116918905A - Method for producing cottonseed protein by puffing leaching method - Google Patents

Abstract

The invention relates to the technical field of agricultural product processing, and discloses a method for producing cottonseed protein by an puffing leaching method, which comprises the following steps: separating the kernel and shell of the cotton kernel optical seed to obtain cotton shell and cotton kernel; mechanically rolling the cotton seeds after softening treatment to obtain cotton seed embryo pieces; conveying the cotton seed embryo pieces to a bulking machine for bulking to obtain bulked cotton embryo; feeding the puffed cotton embryo into a shallow material bed double-layer drag chain type leacher with forced draining, spraying and soaking the puffed cotton embryo between a feeding end and a discharging end of the leacher by mixed oil with decreasing concentration, and draining to obtain wet meal; discharging wet meal from the leacher, and putting the wet meal into a bulking machine for bulking again; drying and cooling the wet meal subjected to re-puffing treatment to obtain the cottonseed protein. The invention not only can improve the nutritive value of the final cottonseed protein, but also can reduce the content of gossypol and reduce toxicity, so that the application of the cottonseed protein in livestock and poultry feeds is safer and more efficient, and the application range and the dosage are enlarged.

Description

A method for producing cottonseed protein by puffing and leaching

Technical field

The invention relates to the technical field of agricultural product processing, and in particular to a method for producing cottonseed protein by puffing and leaching.

Background technique

Cottonseed is one of the four major oil crops in my country. The oil content of cotton kernel is as high as 40%. Cottonseed oil contains a large amount of essential fatty acids and protein, of which the protein content can be as high as 39%. It is an important oil and protein crop in the world after soybeans. . Cottonseed is an important plant protein resource for countries around the world. The annual global cottonseed output is about 30 million tons, and China accounts for one-third of its cottonseed output. It is the world's largest cotton-producing country. The cake produced by cottonseed deoiling accounts for 5% of the world's protein supply. my country's cottonseed cake accounts for 5% of the world's protein supply. The proportion of protein meal produced is approximately 11%.

The presence of gossypol during cottonseed processing will affect the use of cottonseed protein. Gossypol is a toxic phenolic pigment unique to cottonseed. Depending on the cotton variety and planting area, the content of gossypol in cottonseed is 0.15%-1.8%.

In order to reduce the toxicity of gossypol, in the current cottonseed pre-pressing and leaching process, high-moisture steaming is used for steaming and frying cotton kernels. In the first layer of the auxiliary steaming and frying pot, the moisture content of the green body reaches 18%. -22%. Due to the large draft of the billet, the phospholipids first absorb water and condense in the cake, reducing the chance of combining with free gossypol. At this time, free gossypol combines with protein to form gossypol and remains in the cake. Due to the combined gossypol Phenol has low toxicity and will not affect the feeding value of cottonseed cake. It also reduces the deepening of oil color and the content of free gossypol in crude oil, thus improving the quality of crude oil; however, the limiting amino acid of cottonseed protein is lysine. , during the high-moisture steaming process, the protein combines with free gossypol, in which the E-amino group of lysine combines with the active aldehyde group of gossypol to form a Schiff base, which makes lysine ineffective. Therefore, from a nutritional point of view, this pair The nutritional value of cottonseed protein is unfavorable, because cottonseed protein will retain the toxicity of gossypol, making it unable to be directly used in livestock feed. If used in feed, further specialized detoxification treatment will be required, which will cause a waste of cotton protein.

Contents of the invention

In view of this, the present invention provides a method for producing cottonseed protein by puffing and leaching, which solves the problems of deep protein deformation, high toxicity, and low nutritional value during cottonseed processing.

The first object of the present invention is to provide a method for producing cottonseed protein by puffing and leaching, which includes the following steps:

(1) Separation of kernels and shells: Separation of kernels and shells from cotton kernel light seeds through a roller shelling machine to obtain cotton shells and cotton kernels;

(2) Conditioning and embryo rolling: The cotton kernels are softened and then mechanically rolled to obtain cotton seed embryo pieces;

(3) Puffing: The cotton seed embryo pieces are transported to a puffing machine for puffing to obtain puffed cotton embryos;

(4) Leaching: Send the puffed cotton embryo into a shallow material bed double-layer drag chain type extractor with forced draining, and the puffed cotton embryo passes between the feed end and the discharge end of the extractor. The mixed oil with decreasing concentration is sprayed, soaked and then drained to obtain wet meal;

(5) Re-expanding: the wet meal is discharged from the extractor and enters the puffing machine for puffing treatment again;

(6) Wet meal evaporation: dry and cool the re-expanded wet meal to obtain cottonseed protein.

Preferably, in the above method for producing cottonseed protein by puffing and leaching, the separated cotton kernels are subjected to secondary screening and winnowing in step (1) to adjust the cotton hull content in the cotton kernels to less than 5%. To obtain cottonseed meal with different protein contents.

Preferably, in the above method for producing cottonseed protein by puffing and leaching, the separated cotton husks are whipped twice to obtain secondary cotton husks and secondary cotton kernels in step (1), and the secondary cotton husks are obtained. The secondary cotton shells are transported to the cotton shell warehouse through a conveyor, and the secondary cotton kernels and the cotton kernels are mixed together and then enter the softening process together.

Preferably, in the above method for producing cottonseed protein by puffing and leaching, in step (2), a vertical softening pot and a horizontal drum softening pot are used to soften the cotton kernels, and the softening temperature is 75-75 85℃, softening time is 20-30min, softening moisture is 9-10%.

The invention uses a vertical softening pot and a horizontal drum softening pot to steam the cottonseed embryo pieces with high moisture to inactivate the free gossypol in the cottonseed in advance, combine it with the protein in the cottonseed, and reduce the free gossypol in the finished cotton meal. Gossypol content.

It should be noted that if the softening time is not enough, the material will be overcooked, which is not conducive to the molding during puffing and will also increase the residual oil in the meal after leaching; if the softening time is too long, the oil will easily come out early during the puffing process, and boronization will occur. The materials cannot be bonded and formed, which affects the entire process effect.

Preferably, in the above method for producing cottonseed protein by puffing and leaching, the heating sources of the vertical softening pot and the horizontal drum softening pot are sequentially high-temperature condensed water, low-pressure exhaust steam, and saturated water vapor to ensure the softening effect.

Preferably, in the above-mentioned method for producing cottonseed protein by puffing and leaching, the mechanical rolling in step (2) is to press the softened cotton kernel through a roller hydraulic flaking machine to obtain cottonseed embryo pieces.

During the embryo pressing process, the cell walls of the oil seeds rupture under the action of squeezing and rubbing, releasing the oil wrapped in the cells. Pressing into thin sheets greatly shortens the distance for the oil to flow out, making it easy to remove the oil during leaching.

Preferably, in the above-mentioned method for producing cottonseed protein by puffing and leaching, the thickness of the cottonseed embryo sheet is 0.25-0.3mm.

It should be noted that the thinner the cotton seed embryo, the better. If it is too thin, the powderiness of the cotton seed embryo will increase, the penetration rate of the leaching solvent will decrease, and the power consumption of the embryo rolling machine will also increase. After a lot of research, it was found that , the best balance effect can be achieved by controlling the thickness of the cotton seed embryo sheet at 0.25-0.3mm.

Preferably, in the above method for producing cottonseed protein by puffing and leaching, the temperature inside the puffing machine described in step (3) is 250-280°C, and the puffing time is 5-8 minutes.

Puffing can increase the bulk density and the permeability of the mixed oil during leaching, increase the concentration of the mixed oil, increase the leaching capacity and product quality, reduce the consumption of steam and electricity in the leaching workshop, and at the same time improve the digestion of the meal to animals during feeding. Absorption efficiency.

Specifically, the puffing process of the present invention heats the raw materials to 250-280°C, which can obtain an intermediate product with a larger specific surface area, further destroying the cell structure of the oil seeds, and the cotton seed embryo pieces form high pressure under the action of machinery and steam pressure. The material at the discharge port expands rapidly and the water evaporates rapidly to form a puffed cotton embryo with a sponge-like structure.

Preferably, in the above-mentioned method for producing cottonseed protein by puffing and leaching, step (4) is specifically:

The extruded cotton embryos are fed into the feed hopper of the extractor by the feeding scraper through the safety inserting plate and the feeding sealing auger. A material level sensor is installed above the hopper to automatically control the spindle speed of the extractor to ensure that the The material level is stable; the puffed cotton embryo is driven by the drag chain in the extractor, during which it flips over at the tail of the upper layer and falls to the lower grid plate, and continues to run to the discharge port; fresh solvent is added from near the discharge end to maximize the Reduce the solvent oil content in the puffed cotton embryo; the material is sprayed and soaked by the mixed oil with decreasing concentration between the feed end and the discharge end, forming a counter-current operation; the extraction liquid collection hopper in the draining section adopts a special design, which can A pressure difference is formed between the upper and lower parts of the grate, which strengthens the final draining effect.

The extractor of the present invention can produce better draining effect of puffed cotton embryos without any side effects. The drained wet meal is discharged from the bottom of the extractor and enters the puffing machine for re-expanding treatment.

Preferably, in the above method for producing cottonseed protein by puffing and leaching, the temperature inside the puffing machine described in step (5) is 150-180°C, and the puffing time is 1-3 minutes.

The re-expansion process can further eliminate the anti-nutritional factors in the wet meal and improve the nutritional value. At the same time, the extrusion and re-expansion process can reduce the gossypol content in the wet meal, reduce the toxicity, and further improve the nutritional value of the wet meal, making cottonseed protein more effective in livestock and poultry feeds. The applications in it are more safe and efficient, and the scope of use and usage are expanded.

Preferably, in the above-mentioned method for producing cottonseed protein by puffing and leaching, the drying temperature in step (6) is 110-130°C, and the material is dried until the moisture content of the material is less than 6.5%.

Preferably, in the above method for producing cottonseed protein by puffing and leaching, the cooling temperature in step (6) is 0-15°C.

Preferably, in the above-mentioned method for producing cottonseed protein by puffing and leaching, the wet meal evaporation and removal process in step (6) is realized by evaporation and removal.

Specifically, the steam dehydration machine consists of a pre-delayering layer, a desolvation layer, a steam layer, a comprehensive layer, a drying layer and a cooling layer. Among them, the pre-delayering uses indirect steam heating to evaporate part of the surface solvent of the wet meal; the desolvation layer uses the direct steam injected from the steam layer into the meal to distill the water vapor generated when the wet meal comes into counter-current contact according to Schumacher's principle. function to remove the remaining trace solvent in the meal; the comprehensive layer uses the secondary water vapor generated by the flashing of the hot meal to replace part of the direct steam after being compressed by a heat pump, thereby saving energy and improving the flavor of the meal. At the same time, it can more conveniently accept substances that need to be added to the meal, such as waste water, colloid, etc.; the hot meal after desolvation falls from the comprehensive layer through the unloading rotary valve into the drying layer, and the ambient air is heated by the fan through the air heater. After the hot air is formed, it is blown into the meal from the drying layer jacket to dry the meal; the ambient air is then used to cool the meal in the cooling layer.

Drying and cooling can adjust the temperature and moisture of the meal, so that the moisture and temperature of the meal meet the storage requirements. The waste air generated by drying and cooling is separated from the meal powder by Shakron and then emptied. The separated meal powder is collected from the ash outlet of Sakron to the meal conveying equipment through the air shutoff device, and the finished meal is sent to the meal warehouse through the conveying equipment.

The second object of the present invention is to also provide a cottonseed protein produced by the above-mentioned puffing and leaching method.

The invention provides a method for producing cottonseed protein by puffing and leaching. Compared with the existing technology, its beneficial effects are:

The present invention adds a re-expansion process between the leaching and wet meal evaporation and removal processes, which can not only improve the nutritional value of the final cottonseed protein, but also reduce the gossypol content and toxicity, making the cottonseed protein more suitable for livestock and poultry feeds. It is safer and more efficient, and expands the scope and dosage of use.

Detailed ways

The technical solutions in the embodiments of the present invention will be described clearly and completely below. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

Example 1

A method for producing cottonseed protein by puffing and leaching, including the following steps:

(1) Separation of kernels and shells: Separation of kernels and shells from cotton kernel light seeds through a roller shelling machine to obtain cotton shells and cotton kernels;

(2) Quenching, tempering and flaking: A vertical softening pot and a horizontal drum softening pot are used to soften the cotton kernels in sequence, and then the softened cotton kernels are pressed by a roller hydraulic flaking machine to obtain a thickness of 0.25- 0.3mm cotton seed embryo piece;

Among them, the heating sources of the vertical softening pot and the horizontal drum softening pot use high-temperature condensed water, low-pressure exhaust steam, and saturated water vapor in sequence; the softening temperature is 80°C, the softening time is 25 minutes, and the softened moisture is 9%;

(3) Puffing: Transport the cotton seed embryo pieces to an extruder at a temperature of 275°C for puffing for 6 minutes to obtain puffed cotton embryos;

(4) Leaching: The leaching material, puffed cotton embryos, is sent into the hopper of the leaching device through the feeding scraper through the safety inserting plate and the feeding sealing auger. There is a material level sensor above the hopper to automatically control the spindle speed of the leaching device. This ensures that the material level in the hopper is stable; the puffed cotton embryo is driven by the drag chain in the extractor, during which it flips over at the tail of the upper layer and falls to the lower grid plate, and continues to run to the discharge port; fresh solvent is added from near the discharge end , to minimize the solvent oil content in the puffed cotton embryo; the material is sprayed and soaked by the mixed oil with decreasing concentration between the feed end and the discharge end to form a counter-current operation; the extraction liquid collection hopper in the draining section adopts The special design can create a pressure difference between the upper and lower sides of the grid plate, thereby strengthening the final draining effect and obtaining wet meal;

(5) Re-expansion: The wet meal is discharged from the extractor and enters the expansion machine at a temperature of 165°C for another expansion process for 2 minutes;

(6) Wet meal evaporation: dry the re-expanded wet meal at a temperature of 120°C until the material moisture is less than 6.5%, and then cool and store it at 0-15°C to obtain cottonseed protein;

Specifically, the wet meal steaming and stripping process is realized by steaming and stripping. The steam dehydration machine consists of pre-delayering, desolvation layer, steam layer, comprehensive layer, drying layer and cooling layer. Among them, the pre-delayering uses indirect steam heating to evaporate part of the solvent on the surface of the wet meal; the desolvation layer uses the steam distillation effect generated when the direct steam injected from the steam layer into the meal and the wet meal countercurrently contacts the wet meal according to Schumacher's principle. The remaining trace solvent in the meal is removed; the comprehensive layer uses the secondary water vapor generated by the hot meal to be compressed by a heat pump to replace part of the direct steam, thereby saving energy and improving the flavor of the meal. At the same time, it is also more convenient to accept substances that need to be added to the meal, such as waste water, colloid, etc.; the hot meal after desolvation falls from the comprehensive layer through the unloading rotary valve into the drying layer, and the ambient air is heated by the fan through the air heater to become hot. The air is then blown into the meal from the drying layer jacket to dry the meal; the ambient air is then used to cool the meal in the cooling layer.

Example 2

A method for producing cottonseed protein by puffing and leaching, including the following steps:

(1) Separation of kernels and shells: Separation of kernels and shells from cotton kernel light seeds through a roller shelling machine to obtain cotton shells and cotton kernels;

(2) Quenching, tempering and flaking: A vertical softening pot and a horizontal drum softening pot are used to soften the cotton kernels in sequence, and then the softened cotton kernels are pressed by a roller hydraulic flaking machine to obtain a thickness of 0.25- 0.3mm cotton seed embryo piece;

Among them, the heating sources of the vertical softening pot and the horizontal drum softening pot use high-temperature condensed water, low-pressure exhaust steam, and saturated water vapor in sequence; the softening temperature is 75°C, the softening time is 30 minutes, and the softening moisture is 10%;

(3) Extrusion: Transport the cotton seed embryo pieces to an extruder at a temperature of 250°C for 8 minutes to obtain puffed cotton embryos;

(4) Leaching: The leaching material, puffed cotton embryos, is sent into the hopper of the leaching device through the feeding scraper through the safety inserting plate and the feeding sealing auger. There is a material level sensor above the hopper to automatically control the spindle speed of the leaching device. This ensures that the material level in the hopper is stable; the puffed cotton embryo is driven by the drag chain in the extractor, during which it flips over at the tail of the upper layer and falls to the lower grid plate, and continues to run to the discharge port; fresh solvent is added from near the discharge end , to minimize the solvent oil content in the puffed cotton embryo; the material is sprayed and soaked by the mixed oil with decreasing concentration between the feed end and the discharge end to form a counter-current operation; the extraction liquid collection hopper in the draining section adopts The special design can create a pressure difference between the upper and lower sides of the grid plate, thereby strengthening the final draining effect and obtaining wet meal;

(5) Re-expansion: The wet meal is discharged from the extractor and enters the expansion machine at a temperature of 150°C for another expansion process for 3 minutes;

(6) Wet meal evaporation: dry the re-expanded wet meal at a temperature of 110°C until the material moisture is less than 6.5%, then cool and store it at 0-15°C to obtain cottonseed protein;

Specifically, the wet meal steaming and stripping process is realized by steaming and stripping. The steam dehydration machine consists of pre-delayering, desolvation layer, steam layer, comprehensive layer, drying layer and cooling layer. Among them, the pre-delayering uses indirect steam heating to evaporate part of the solvent on the surface of the wet meal; the desolvation layer uses the steam distillation effect generated when the direct steam injected from the steam layer into the meal and the wet meal countercurrently contacts the wet meal according to Schumacher's principle. The remaining trace solvent in the meal is removed; the comprehensive layer uses the secondary water vapor generated by the hot meal to be compressed by a heat pump to replace part of the direct steam, thereby saving energy and improving the flavor of the meal. At the same time, it is also more convenient to accept substances that need to be added to the meal, such as waste water, colloid, etc.; the hot meal after desolvation falls from the comprehensive layer through the unloading rotary valve into the drying layer, and the ambient air is heated by the fan through the air heater to become hot. The air is then blown into the meal from the drying layer jacket to dry the meal; the ambient air is then used to cool the meal in the cooling layer.

Example 3

A method for producing cottonseed protein by puffing and leaching, including the following steps:

(1) Separation of kernels and shells: Separation of kernels and shells from cotton kernel light seeds through a roller shelling machine to obtain cotton shells and cotton kernels;

(2) Quenching, tempering and flaking: A vertical softening pot and a horizontal drum softening pot are used to soften the cotton kernels in sequence, and then the softened cotton kernels are pressed by a roller hydraulic flaking machine to obtain a thickness of 0.3mm. Cottonseed embryo pieces;

Among them, the heating sources of the vertical softening pot and the horizontal drum softening pot use high-temperature condensed water, low-pressure exhaust steam, and saturated water vapor in sequence; the softening temperature is 85°C, the softening time is 20 minutes, and the softening moisture is 10%;

(3) Puffing: Transport the cotton seed embryo pieces to an extruder at a temperature of 280°C for puffing for 5 minutes to obtain puffed cotton embryos;

(4) Leaching: The leaching material, puffed cotton embryos, is sent into the hopper of the leaching device through the feeding scraper through the safety inserting plate and the feeding sealing auger. There is a material level sensor above the hopper to automatically control the spindle speed of the leaching device. This ensures that the material level in the hopper is stable; the puffed cotton embryo is driven by the drag chain in the extractor, during which it flips over at the tail of the upper layer and falls to the lower grid plate, and continues to run to the discharge port; fresh solvent is added from near the discharge end , to minimize the solvent oil content in the puffed cotton embryo; the material is sprayed and soaked by the mixed oil with decreasing concentration between the feed end and the discharge end to form a counter-current operation; the extraction liquid collection hopper in the draining section adopts The special design can create a pressure difference between the upper and lower sides of the grid plate, thereby strengthening the final draining effect and obtaining wet meal;

(5) Re-expansion: The wet meal is discharged from the extractor and enters the expansion machine at a temperature of 180°C for expansion treatment again for 1 minute;

(6) Wet meal evaporation: dry the re-expanded wet meal at a temperature of 130°C until the material moisture is less than 6.5%, and then cool and store it at 0-15°C to obtain cottonseed protein;

Specifically, the wet meal steaming and stripping process is realized by steaming and stripping. The steam dehydration machine consists of pre-delayering, desolvation layer, steam layer, comprehensive layer, drying layer and cooling layer. Among them, the pre-delayering uses indirect steam heating to evaporate part of the solvent on the surface of the wet meal; the desolvation layer uses the steam distillation effect generated when the direct steam injected from the steam layer into the meal and the wet meal countercurrently contacts the wet meal according to Schumacher's principle. The remaining trace solvent in the meal is removed; the comprehensive layer uses the secondary water vapor generated by the hot meal to be compressed by a heat pump to replace part of the direct steam, thereby saving energy and improving the flavor of the meal. At the same time, it is also more convenient to accept substances that need to be added to the meal, such as waste water, colloid, etc.; the hot meal after desolvation falls from the comprehensive layer through the unloading rotary valve into the drying layer, and the ambient air is heated by the fan through the air heater to become hot. The air is then blown into the meal from the drying layer jacket to dry the meal; the ambient air is then used to cool the meal in the cooling layer.

Comparative example 1

The method of producing cottonseed protein by puffing and leaching in Comparative Example 1 is basically the same as that in Example 1. The only difference is that Comparative Example 1 omits the re-expanding process of step (5).

Comparative example 2

The method of producing cottonseed protein by puffing and leaching in Comparative Example 2 is basically the same as that in Example 1. The only difference is that in the re-expanding process of step (5), the wet meal is discharged from the leaching device and enters the puffing machine at a temperature of 275°C for puffing again. Process for 6 minutes.

Comparative example 3

The method of producing cottonseed protein by puffing and leaching in Comparative Example 3 is basically the same as that in Example 1. The only difference is that the softening temperature in step (2) is 90°C and the softening time is 10 minutes.

Comparative example 4

The method of producing cottonseed protein by puffing and leaching in Comparative Example 4 is basically the same as that in Example 1. The only difference is that the softening temperature in step (2) is 70°C and the softening time is 35 minutes.

The crude protein content, crude fiber content, crude ash content, protein solubility, residual oil rate, moisture and free gossypol content were measured on the cottonseed protein prepared in Examples 1-3 and Comparative Examples 1-4. The measurement results are as follows: Shown:

Table 1 Test results

As can be seen from the above table, the crude protein content and protein solubility of the cottonseed protein prepared by the present invention are significantly improved, and the free gossypol content, residual oil rate, crude fiber content, etc. are significantly reduced. Therefore, the present invention uses re-expansion treatment and softening The limitation of process parameters greatly improves product quality and safety.

Each embodiment in this specification is described in a progressive manner. Each embodiment focuses on its differences from other embodiments. The same and similar parts between the various embodiments can be referred to each other. As for the solution disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple. For relevant details, please refer to the description in the method section.

The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be practiced in other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (9)

1. The method for producing the cottonseed protein by the puffing leaching method is characterized by comprising the following steps of:

(1) Kernel-shell separation: separating the kernels and the shells of the optical seeds of the cotton kernels by a roller type sheller to obtain cotton shells and cotton kernels;

(2) Tempering and rolling blanks: mechanically rolling the cotton seeds after softening treatment to obtain cotton seed embryo pieces;

(3) Puffing: conveying the cotton seed embryo pieces to a bulking machine for bulking to obtain bulked cotton embryo;

(4) Leaching: the puffed cotton embryo is sent into a shallow material bed double-layer drag chain type leacher with forced draining, and the puffed cotton embryo is sprayed and soaked by mixed oil with decreasing concentration between the feeding end and the discharging end of the leacher, and then drained to obtain wet meal;

(5) Puffing: the wet meal is discharged from the leacher and enters an expansion machine to be expanded again;

(6) Steaming wet meal: drying and cooling the wet meal subjected to re-puffing treatment to obtain the cottonseed protein.

2. The method of producing cottonseed protein by the puffing and leaching method according to claim 1, wherein the separated cotton hulls in the step (1) are subjected to secondary beating to obtain secondary cotton hulls and secondary cotton seeds, the secondary cotton hulls are transported to a cotton hull warehouse, and the secondary cotton seeds and the cotton seeds are mixed and then enter softening treatment together.

3. The method for producing cottonseed protein by the puffing leaching method according to claim 1, wherein the cotton seeds are softened by adopting a vertical softening pot and a horizontal roller softening pot in sequence in the step (2), the softening temperature is 75-85 ℃, the softening time is 20-30min, and the softening moisture is 9-10%.

4. The method for producing cottonseed protein by the puffing leaching method according to claim 1, wherein the thickness of the cotton seed embryo piece is 0.25-0.3mm.

5. The method for producing cottonseed protein by the puffing leaching method according to claim 1, wherein the temperature in the puffing machine in the step (3) is 250-280 ℃ and the puffing time is 5-8min.

6. The method for producing cottonseed protein by the expansion leaching method according to claim 1, wherein the temperature in the expander in the step (5) is 150-180 ℃ and the expansion time is 1-3min.

7. The method for producing cottonseed protein by the puffing leaching method according to claim 1, wherein the drying temperature in the step (6) is 110-130 ℃, and the cottonseed protein is dried until the moisture content of the material is lower than 6.5%.

8. The method for producing cottonseed protein by the process of claim 1 wherein the cooling temperature in step (6) is 0-15 ℃.

9. A cottonseed protein produced by the process of any one of claims 1 to 8.