CN105603129A - Preparation method of healthy and nutritional sugar - Google Patents

Abstract

The invention belongs to the technical field of sugar processing and discloses a preparation method of healthy and nutritious sugar. The preparation method is to pre-ash and heat the sugar juice, and then undergo rapid clarification and separation through forced centrifugal sedimentation, add activated carbon or diatomite clarifier to the obtained settled sugar juice, and then pass through a preferred membrane separation and clarification system to react sugar Juice cleaning treatment, the clean sugar juice enters the process of evaporation and concentration into sugar to make corresponding healthy and nutritious products; the mud juice and filter cake obtained by centrifugal sedimentation and membrane separation cleaning enter the deep dejuicing system of multiple pairs of rollers for high-pressure deep dejuicing , the moisture content of the dry filter residue is less than 60%, and the residual sugar is controlled within 5 degrees of light conversion, further reducing the amount of filter residue and sugar loss. The healthy and nutritious sugar prepared by the method of the invention largely retains the active ingredients in the sugar juice, the product has high purity, good quality and certain nutritional value, and has broad market application prospects.

Description

A kind of preparation method of healthy nutrition sugar

technical field

The invention belongs to the technical field of sugar processing, and in particular relates to a preparation method of healthy and nutritious sugar.

Background technique

The production mode of foreign sugar production is raw sugar production and sugar refining production mode, which is somewhat different from the production mode of direct production of cultivated land white sugar in China. The more advanced sugar solution clarification methods in foreign countries include: membrane separation method, ion exchange method, membrane separation method Due to the addition of a large amount of lime, phosphoric acid, flocculant, CO ₂ /S0 ₂ and high temperature treatment during the clarification of sugar juice, problems such as the dissolution and increase of colloidal substances in the clarified sugar juice, and the backwardness of the early membrane material industry technology resulted in poor membrane accuracy. High membrane cost, high membrane cost, and fast attenuation during membrane use have not been continuously applied and demonstrated in industrialized large-scale sugar production so far; the ion exchange method has been widely used in foreign sugar refineries, and advanced ion exchange methods have also been introduced in China. Exchange equipment, but there are problems such as high material quality requirements and complicated operation, and domestic sugar refineries have not been able to apply and promote it well.

Domestic sugar factories have two classic processes for cleaning sugar juice. Beet mostly adopts carbonation process. This process needs to add a large amount of Ca(OH) ₂ and CO ₂ in the process of cleaning sugar juice. The content of organic matter is low, the content of calcium carbonate is over 80%, it has no agricultural value, and the discharge is large, which has caused some pollution to the environment; at present, most of the cane sugar factories use the sulfurous acid clarification process, which has the following shortcomings:

(1) A large amount of SO ₂ is used in the production process to convert sucrose, which reduces the recovery rate of sucrose in sugar juice, and will inevitably increase the content of SO ₂ in white sugar, affecting the safety of sugar;

(2) The clarification efficiency of cane juice is low, the product quality fluctuates greatly with the change of raw materials, and the sugar yield is low.

The mud juice treatment process of the two processes needs to consume a large amount of process hot water (the water consumption is generally about 1.5 times the amount of wet filter mud) to reduce the amount of residual sugar in the filter mud.

With the needs of clean production, sustainable development, and the demand for sugar products, especially the demand for specialty sugar and nutritious sugar, the traditional sugar clarification process is facing great challenges, and it is urgent to find new production methods for specialty sugar and nutritious sugar In order to meet the needs of the continuous development of the market and enrich the sugar demand of consumers.

my country's sugar industry research work has been exploring new special sugar production processes. The nutritional sugar described in Chinese patents 201310048613.8 and 92104442.9 is to produce nutritious sugar products with honey directly or after air flotation clarification of the by-product molasses. Heating at high temperature, the nutrients in it are greatly transformed or lost, and the classic sulfite method is still used in the production process, and the product quality has certain limitations; The method of flavor cane juice and feed raw materials, the method is based on the integration of functions such as membrane process separation, concentration and cold sterilization, using multi-stage membranes to produce nutritional sugar, flavor cane juice and feed raw materials in parallel, with no need to add chemicals, production energy consumption It can realize the maximum preservation of the natural nutrition and flavor of the finished sugar, which is conducive to the optimization and upgrading of sugar products and the comprehensive utilization of sugar resources. Although membrane separation has many advantages for the separation process, pure multi-stage membrane separation systems are limited. The quality of material clarification treatment, the filtration performance of membrane elements, cost performance, membrane attenuation performance and life, and expensive operating costs and other issues.

Centrifugal forced sedimentation technology uses the difference in specific gravity between solid and liquid, and relies on the centrifugal force field to enlarge it thousands of times. The solid phase is settled under the action of centrifugal force, thereby realizing solid-liquid separation. It is suitable for the extraction and separation of solid-containing suspension solutions, but this Technology has high requirements on equipment and technology. At present, there are no reports on the distribution of clarified materials in the traditional sugar industry. Because the traditional sugar industry adopts carbonation and sulfurous acid production processes, heavy calcium carbonate and sulfurous acid are produced. Calcium precipitation, the application of traditional sedimentation tanks can solve the production problem, but with the continuous development of social living standards, people's demand for nutritional and healthy products is getting higher and higher, and adding more additives obviously cannot meet the differentiated needs. Therefore, there is an urgent need in the sugar field to develop an efficient method for producing healthy and nutritious sugar products to produce healthy and nutritious products.

Contents of the invention

In order to solve the shortcomings and deficiencies of the prior art, the object of the present invention is to provide a method for preparing healthy and nutritious sugar.

The object of the invention is achieved through the following technical solutions:

A preparation method of healthy nutritional sugar is characterized in that it is realized through the following steps:

A. Sugar juice pretreatment: add lime milk to the sugar juice to adjust the pH value to 4.5-8.5, and heat it to 45-60°C once;

B. Centrifugal sedimentation and separation: after pretreatment, the sugar juice enters the centrifuge for forced sedimentation treatment to obtain sedimented sugar juice and mud juice;

C. Clarification of sugar juice: The sugar juice is heated to 65-90°C for the second time, and the clarification of the heated sugar juice is divided into two ways:

1. Add 0.1%-3% (to juice ratio) of powdered activated carbon and stir for 20-50 minutes for adsorption reaction, then add 0.1%-1.5% (to juice ratio) of diatomite and stir evenly;

2. Add 0.2%-5% (to juice ratio) of diatomite to the sugar juice for 3-10 minutes;

D. Membrane separation and cleaning: After clarification, the sugar juice enters a 0.1-30 micron membrane filtration system for clean separation, and clear and bright clean sugar juice and filter cake are obtained;

E. Concentration into sugar: clean sugar juice is obtained through the evaporation and concentration system to obtain concentrated massecuite, which is then processed into sugar, and finally packaged to obtain healthy and nutritious sugar;

F. Deep de-juicing of mud juice and filter cake: The residual sugar in mud juice and filter cake is reduced to below 5 degrees by using a belt-type rolling deep de-juicing treatment system.

The sugar juice is preferably sugarcane juice, beet juice and sweet sorghum juice.

The separation factor of the centrifugal sedimentation centrifuge is 2000G-15000G, and the material residence time is 3-15 minutes.

The membrane separation and cleaning membrane element is a titanium metal membrane, a stainless steel membrane, a PE filter element and a PA filter element, the pressure resistance is above 0.4MPa, and the operating filtration pressure is 0.02-0.3MPa.

The condensing into sugar refers to condensing the clear sugar juice into crystalline sugar, tablet sugar, powdered sugar, instant sugar or syrup.

The mud juice and filter cake deep de-juicing system has 1-5 sets of pressure rollers, the pressure is gradually increased to de-juice the material, the pressure is controlled at 1-90MPa, and the residual sugar of the dry filter residue after de-juicing is controlled at a light rotation degree of 5 Below, the moisture content is controlled below 60%.

The preparation method of the present invention has the following innovations and beneficial effects:

(1) For the first time, the method of the present invention adopts the technology of forced centrifugal sedimentation and membrane separation coupling to clean sugar juice, which has high clarification efficiency, short residence time of sugar juice, less sugar conversion, and no addition of additives such as SO ₂ and flocculants;

(2) For the first time, the mud juice and filter cake adopt the belt-type rolling deep de-juicing system, which belongs to the modern green and efficient physical separation technology. High, stable cleaning effect, clean and environmentally friendly, etc., the dry slag cake has low moisture content and less waste solids;

(3) The healthy and nutritious sugar product produced by the preparation method of the present invention has the advantages of good safety, no addition of SO ₂ and flocculant (polyacrylamide, poisonous monomer) in the clarification process, high product quality, and long shelf life.

Description of drawings

Fig. 1 is the process flow chart of a kind of preparation method of healthy nutritional sugar of the present invention.

detailed description

The present invention will be further described in detail below in conjunction with examples, but the embodiments of the present invention are not limited thereto.

Example 1

The preparation method of a healthy and nutritious sugar in this embodiment, the specific operation steps are as follows: add lime milk to the sugarcane mixed juice to adjust the pH value to 7.2 and heat it to 55°C, enter it into a centrifuge with a centrifugal force of 3200G for sedimentation and separation, and control the residence time After 10 minutes, the clear sugar juice and mud juice were obtained, and the clear sugar juice was heated to 80°C for the second time, then 1.5% (to juice ratio) diatomaceous earth was added, stirred and reacted for 5 minutes, and then passed through a 1 micron stainless steel membrane for clean separation , to obtain clean sugar juice and mud juice. The clean sugar juice is concentrated by an evaporation and concentration system to obtain a massecuite with a hammer weight of 90oBx. The temperature of the pot is controlled at about 126°C. Nutritious brown sugar products; mud juice obtained by centrifugal sedimentation and membrane separation is mixed and then entered into three sets of pressure roller deep de-juicing system, control the roller pressure within 30MPa, add 40% of 80 ℃ process hot water to the dry filter mud, and process to obtain moisture content For the dry filter cake with less than 58%, the residual sugar is controlled within 4.5 degrees of light, and the filtered juice is returned to the mixed juice for further processing.

Example 2

A method for preparing healthy and nutritious sugar in this embodiment, the specific operation steps are as follows: add milk of lime to the sugarcane mixed juice to adjust the pH value to 8.5 and heat it to 55°C, enter it into a centrifuge with a centrifugal force of 6000G for sedimentation and separation, and control the residence time After 8 minutes, the clear sugar juice and mud juice were obtained. After heating the clear sugar juice to 85°C for the second time, add 0.8% (to juice ratio) of powdered activated carbon and stir for 40 minutes, then add 1.0% (to juice ratio) of Diatomaceous earth, stirred evenly and then cleaned and separated through a 5-micron PA membrane to obtain clean sugar juice and filter cake. The cleaned sugar juice was concentrated by a five-effect vacuum evaporation and concentration system to obtain a syrup with a hammer weight of 65oBx. The syrup was stored in an atmospheric crystallization tank It is further concentrated into the traditional three-series sugar cooking process to produce white sugar and high-quality brown sugar products; the mud juice and filter cake respectively enter the four sets of pressure roller deep de-juicing systems, and the roller pressure is controlled within 40MPa, and the water content is less than 55 % of the dry filter cake, the residual sugar is controlled within 4 degrees of light, and the filtered juice is returned to the mixed juice box for further processing.

The above-mentioned embodiment is a preferred embodiment of the present invention, but the embodiment of the present invention is not limited by the above-mentioned embodiment, and any other changes, modifications, substitutions, combinations, Simplifications should be equivalent replacement methods, and all are included in the protection scope of the present invention.

Claims (6)

1. A preparation method of healthy nutritional sugar, characterized in that it is realized through the following steps: A. Sugar juice pretreatment: add lime milk to the sugar juice to adjust the pH value to 4.5-8.5, and heat it to 45-60°C once; B. Centrifugal sedimentation and separation: after pretreatment, the sugar juice enters the centrifuge for forced sedimentation treatment to obtain sedimented sugar juice and mud juice; C. Clarification of sugar juice: The sugar juice is heated to 65-90°C for the second time, and the clarification of the heated sugar juice is divided into two ways: 1. Add 0.1%-3% (to juice ratio) of powdered activated carbon and stir for 20-50 minutes for adsorption reaction, then add 0.1%-1.5% (to juice ratio) of diatomite and stir evenly; 2. Add 0.2%-5% (to juice ratio) of diatomite to the sugar juice for 3-10 minutes; D. Membrane separation and cleaning: After clarification, the sugar juice enters a 0.1-30 micron membrane filtration system for clean separation, and clear and bright clean sugar juice and filter cake are obtained; E. Concentration into sugar: clean sugar juice is obtained through the evaporation and concentration system to obtain concentrated massecuite, which is then processed into sugar, and finally packaged to obtain healthy and nutritious sugar; F. Deep de-juicing of mud juice and filter cake: The residual sugar in mud juice and filter cake is reduced to below 5 degrees by using a belt-type rolling deep de-juicing treatment system. 2. The preparation method of a kind of healthy nutritional sugar according to claim 1, characterized in that: said sugar juice is preferably sugarcane juice, beet juice and sweet sorghum juice. 3. A method for preparing healthy and nutritious sugar according to claim 1, characterized in that: the separation factor of the centrifugal sedimentation centrifuge is 2000G-15000G, and the material residence time is 3-15 minutes. 4. A method for preparing healthy and nutritious sugar according to claim 1, characterized in that: the membrane separation and cleaning membrane elements are titanium metal membranes, stainless steel membranes, PE filter cores and PA filter cores, and the pressure resistance is above 0.4MPa. The operating filtration pressure is 0.02-0.3MPa. 5. The preparation method of a kind of healthy and nutritious sugar according to claim 1, characterized in that: said condensing into sugar refers to condensing clean sugar juice into crystalline sugar, tablet sugar, powdered sugar, instant sugar or syrup . 6. A method for preparing healthy and nutritious sugar according to claim 1, characterized in that: the deep de-juicing system of the mud juice and filter cake has 1-5 groups of counter-pressing rollers, and the pressure increases step by step to reduce the depth of the material For dejuicing, the pressure is controlled at 1-90MPa. After dejuicing, the residual sugar of the dry filter residue is controlled below the light conversion degree of 5, and the water content is controlled below 60%.