Method for clearing, decoloring and decontaminating sugar juice

A technology for decolorization and impurity removal and sugar juice, which is applied in the purification of sugar juice, sugar production, sucrose production, etc., can solve the problems of high cost and strong technicality, and achieve the effect of low cost, simple clarification process and good effect

Inactive Publication Date: 2011-11-30
GUANGXI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Regarding the decolorization technology of sugar juice, sugar workers from all over the world have carried out a lot of research, and successively proposed ion exchange technology, membrane separation technology, ultra-freezing crystall

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: To the clarification, decolorization and impurity removal of brown granulated sugar back-dissolving solution.

[0021] Take 100g of red granulated sugar redissolving solution with a concentration of 10wt% in a 250ml beaker, stir and heat to 30°C in a constant temperature magnetic stirrer, start pre-ashing until the pH is 7.02, keep at a constant temperature of 30°C for 20 minutes, and then raise the temperature to Keep the constant temperature at 65°C. At this time, add 8.0ml of 1mol / L calcium hydroxide emulsion (equivalent to 0.59g of calcium hydroxide), 2.1ml of 1mol / L citric acid solution (equivalent to 0.40g of citric acid), and keep the temperature at 65 React at ℃ for 25 minutes, heat to 100℃ for the second time, quickly add 7ppm PAM (polyacrylamide), keep the constant temperature and let it stand for 30 minutes, flocculate and settle, and obtain clarified sugar juice, the decolorization rate can reach 78%.

Embodiment 2

[0022] Example 2: Clarification, decolorization and impurity removal of mixed juice.

[0023] Take 200g of sugarcane mixed juice in a 500ml beaker, stir and heat to 30°C in a constant temperature magnetic stirrer, start pre-ashing until the pH is 7.1, keep the constant temperature at 30°C for 30 minutes, then raise the temperature to 65°C for the first time to keep the constant temperature, at this time Add 5.4ml of 2mol / L calcium hydroxide emulsion (equivalent to 0.80g of calcium hydroxide), 3.3ml of 1mol / L citric acid solution (equivalent to 0.63g of citric acid), and react at a constant temperature of 65°C for 30 minutes. Heating to 90°C for the first time, quickly adding 5ppm PAM (polyacrylamide), keeping the constant temperature and standing still, flocculation and sedimentation.

Embodiment 3

[0024] Embodiment 3: Clarification, decolorization and impurity removal of clear juice.

[0025] Take 100g of the clear juice in a 250ml beaker, stir and heat it to 35°C in a constant temperature magnetic stirrer, start pre-ashing until the pH is 6.8, keep the constant temperature at 35°C for 20 minutes, then raise the temperature to 70°C for the first time to maintain the constant temperature, then add 1mol / L calcium hydroxide emulsion 2.0ml, 2mol / L citric acid solution 0.4ml, react at a constant temperature of 70°C for 30 minutes, heat to 85°C for the second time, quickly add 3ppm PAM (polyacrylamide), keep the constant temperature and let stand, flocculate and settle.

[0026] The time for standing at constant temperature described in each embodiment of the present invention is determined according to the actual situation, and generally stands at constant temperature until the flocculation and sedimentation are complete.

[0027] Each embodiment of the present invention ca...

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Abstract

The invention relates to a method for clearing, decoloring and decontaminating sugar juice. The method comprises the following steps: heating the sugar juice to 25-35 DEG C; pre-liming until the pH value is 6.5-7.5; after preliming, heating the sugar juice to 55-75 DEG C; adding calcium hydroxide emulsion and a citric acid solution, stirring, and reacting for 15-35 minutes at the constant temperature of 55-75 DEG C, wherein the adding amount of calcium hydroxide is 0.10%-0,60% of weight of sugar juice, and the adding amount of citric acid is 0.10%-0.50% of weight of sugar juice; and further heating to 75-100 DEG C, adding 0.5-10ppm of flocculation auxiliary polyacrylamide, standing at the constant temperature, flocculating and precipitating so as to obtain the clear sugar juice. In the method, citric acid reacts with calcium hydroxide so as to obtain a regenerated calcium citrate precipitate particle which is used for decoloring, decontaminating and clearing the sugar juice; the clearing process is simple, is easy to control and is environmentally-friendly; and the method provided by the invention has the advantages of good clearing, decoloring and decontaminating effects, low cost, available raw materials and less filter mud.

Description

technical field [0001] The invention relates to a method for clarifying, decolorizing and removing impurities of sugar juice. Background technique [0002] The clarification, decolorization and impurity removal of sugarcane mixed juice is the key process of sugarcane sugar production. At present, sugar cane sugar production generally adopts the sulfurous acid sugar production process or the carbonation sugar production process. The sulphite sugar production process is to generate sulfur dioxide gas through sulfur combustion, and the sulfur dioxide gas is passed into the pre-ashed cane juice (or sugar juice) for reaction, and the new calcium sulfite precipitate is obtained, and the new calcium sulfite precipitate particles are absorbed in the sugar juice Pigment and other impurities, and then add flocculant for flocculation and sedimentation to realize decolorization, impurity removal and clarification of sugar juice. This method uses harmful sulfur dioxide gas, causes seri...

Claims

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Application Information

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IPC IPC(8): C13B20/00C13B20/02
Inventor 李利军孔红星黄永春杨锋
Owner GUANGXI UNIVERSITY OF TECHNOLOGY
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