JPH0220300A - Recovery of sacchrose from end molasses of sweet potato - Google Patents

Abstract

PURPOSE:To readily improve yield by adding phosphoric acid to a solution obtained by diluting end molasses of sweet potato (EML) with water, controlling pH by adding Ca(OH)2, filtering adding CaCl2, etc., to resultant filtered solution and heating. CONSTITUTION:0.003-0.02wt.% phosphoric acid such as orthophosphoric acid or phosphate is added to a dilute solution obtained by dilution of EML with 4-8 times water and Ca(OH)2 is added to control pH at 10-13, then filtered to obtain a filtered solution. Next, CaCl2 in amount of 5-7wt.% of total sugar is added to said filtered, klept at 8-23 deg.C, 100-120wt.% CaO powder having <=200 mesh in amount of 7-8mol equivalent per 1mol saccharose is added, mixed and filtered to obtain a filtered solution fraction and a low temperature saccharate or residue fraction. Then, said filtered solution fraction is heated at about 90 deg.C and further filtered to obtain a high temperature saccharate as a residue and waste solution. Thus, saccharose is recovered from EML in yield of >=80wt.% in total of low temperature and high temperature saccharates.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for recovering sucrose from cane final molasses in a simple manner.

<Prior Art> The most well-known and simple method of sugar removal is the Stelafen method. This sterafene method is currently in practical use as a method for recovering sucrose from final beet molasses. However, the finished cane molasses contains a large amount of reducing sugar, which interferes with the production of Zaracalate, so it is said that the Stelafen method cannot be applied. is not collected and is only used as fermentation material, feed, and fertilizer. However, since this final cane molasses still contains more than 30% by weight of sucrose, there is currently a need for an effective method for recovering the sucrose.

<Problems to be Solved by the Invention> As described above, the present invention is directed to the final cane molasses, which currently contains 30% by weight of sucrose, but which is not effectively recovered. The purpose of this invention is to provide a simple method for recovering sucrose with high yield.

<Means for Solving the Problems> The above objects of the present invention are achieved by the following means. That is, cane final molasses is diluted 4 to 8 times with water,
After adding phosphoric acid to this diluted solution in an amount of 0.003 to 0.02% by weight, Ca(OH)z was added to adjust the pH to 10 to 1.
The total sugar content of the resulting filtrate was adjusted to 5.
Add ~7% by weight of CaCλ, maintain at 8~23°C, add 100~120% by weight of CaO powder containing sucrose, and filter this mixture to obtain low-temperature saccharate as a residue. , on the other hand, is a method for recovering sucrose from final cane molasses, which is characterized in that the filtrate is heated to about 90° C. and then filtered again to obtain high-temperature saccharate.

In the method of the present invention, when first diluting the final cane molasses with water, if the dilution is not 4 times or more, the insoluble matter will become suspended matter and a large amount of cane powder will not be recovered as the suspended matter. If it is too large, the treatment efficiency will be poor, so it is preferably 8 times or less, and most preferably diluted at a dilution rate of about 6 times so that the sucrose content in the filtrate is about 5% by weight. Also, when adding phosphoric acid such as orthophosphoric acid or phosphate, this phosphoric acid and Ca (O
) l) 2 to destroy reducing sugars and remove impurities such as organic non-sugars as much as possible.
The effect is not noticeable unless it is added in an amount of 0.003% by weight or more, but on the other hand, if it exceeds 0.02% by weight, the amount of saccharate produced decreases, so the amount is limited to 0.003 to 0.02% by weight. In addition, the purpose of adding Ca (Jyo) is to increase the production rate of saccharate due to the salting-out effect, and as a result of the experiments described below, the effect is not significant when it is less than 5% by weight; If the Ca
The amount of CaO added to the mixture containing C1 is 100 to 120% by weight of an amount equivalent to 7 to 8 mol per 1 mol of potato 1i, which is the amount known in the conventionally known Stellafen method. If the temperature of the solution becomes too high, impurities in the saccharate will increase, so it is best to keep it below 23°C.On the other hand, if it becomes too low, the reaction time will take too long, so it is set above 8°C.

<Example> Examples of the present invention will be shown below.

First, the sugar content analysis values of the final cane molasses used in the examples are shown in Table 1 below.

The analytical values of the cleaned filtrate are shown in Table 2 below. The values in Table 2 are converted to final molasses.

Table 2 The final molasses as shown in Table 1 is first diluted 6 times according to the flow sheet showing the pretreatment process shown in FIG. Add, 70
The mixture was heated to 0.degree. C., Ca(OH)x was added in an amount such that the pn of the liquid was 10.8, and the mixture was suction-filtered to obtain a lime-cleaned filtrate.

To this lime-cleaned filtrate, according to the flow sheet showing the sucrose recovery process in Fig. 2, various amounts of CaC 12t'' were added, cooled to 10°C, and 120% by weight of sucrose content of CaO powder of 200 mesh or less was added. The residue was collected as a low-temperature saccharate by suction filtration, and the filtrate was heated to 90'C.
A hot saccharate was obtained by suction filtration.

During the above operation, the analysis values of saccharate and sugar in the waste liquid are shown in Table 3 for low-temperature saccharates and for high-temperature saccharates when using the lime method when the amount of P20G added is changed and the amount of CaCρ2 added is changed. Table 4 and the waste liquid were as shown in Table 5.

Same as Table 3 (The recovery rate of sugar when changing the amount of CaCM added is as shown in Table 6 for low-temperature saccharate, Table 7 for high-temperature saccharate, and Table 8 for waste liquid. Table 9 shows the total of both low and high temperature saccharates.

Table 4 Table 6 Table 7 Table 8 Table 9 6-fold diluted wisteria lime purified filtrate <Effects of the invention> As described above, according to the method of the present invention, the conventional method contains a large amount of reducing sugar. By subjecting the final cane molasses, which was considered to be inapplicable to the Stellafen method, to a pre-treatment process of cleaning it using phosphoric acid and calcium hydroxide, a simple method similar to the Stellafen method can be used thereafter. in,
It is possible to recover sucrose with a high yield of nearly 80% by weight.

Another advantage is that the organic non-sugar content in the resulting saccharate is extremely small.

[Brief explanation of the drawing]

Figure 1 is a flow sheet showing the pretreatment process of the present invention;
The figure is a flow sheet showing the sucrose recovery process.

Claims (1)

[Claims] 1. Dilute final cane molasses 4 to 8 times with water, add phosphoric acid to this diluted solution in an amount of 0.003 to 0.02% by weight, and then add Ca(OH)_2 to adjust the pH to 10 to 1. 13
The total sugar content of the obtained filtrate is 5 to 5.
Add 7% by weight of CaCl_2, maintain at 8-23°C, add 100-120% by weight of CaO powder with sucrose content, filter the mixture to obtain low-temperature saccharate as a residue, while A method for recovering sucrose from final cane molasses, characterized in that the filtrate is heated to about 90°C and then filtered again to obtain high-temperature saccharate.