Decoloring method of redissolved syrup

A syrup and solution technology, which is applied in the decolorization field of resolvable syrup, can solve the problems of inability to retain small molecular pigments of resolvable syrup, and high color value of finished white sugar, so as to improve its own properties, improve the adsorption effect, and improve the collapse of pore structure. Effect

Pending Publication Date: 2022-07-12
GUANGXI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a decolorization method for remelted syrup, which solves the green sugar production process of the membrane method. The membrane separation technology is used to filter the remelted syrup, and the small molecule pigment in the remelted syrup cannot be retained, resulting in the color value of the finished white granulated sugar. high technical issues

Method used

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  • Decoloring method of redissolved syrup

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Effect test

Embodiment 1

[0032] The preparation of quaternary ammonium functionalized chitosan / graphene oxide composite aerogel, the specific steps are as follows:

[0033] (1) Mix chitosan, sodium hydroxide aqueous solution with a concentration of 30% and analytically pure isopropanol solution in a mass ratio of 1.0:2:12, and heat it to 40°C in a water bath to make chitosan generate Swelling reaction, the mixture was stirred and swollen in a constant temperature magnetic stirrer for 200min;

[0034] (2) 60% of (3-chloro-2-hydroxypropyl) trimethylammonium chloride was added dropwise to the mixture, wherein (3-chloro-2-hydroxypropyl) trimethylammonium chloride was the same as the step (1) The mass ratio of the mixture is 0.1:1, and the temperature of the water bath of the mixture is increased to 60°C, stirred in a constant temperature magnetic stirrer, and the stirring condition is 60°C for 6 hours;

[0035] (3) adjust the pH of the reaction mixture with 5% dilute HCl solution to keep the pH neutral; ...

Embodiment 2

[0052] The preparation of quaternary ammonium functionalized chitosan / graphene oxide composite aerogel, the specific steps are as follows:

[0053] (1) Mix chitosan, sodium hydroxide aqueous solution with a concentration of 50% and isopropanol solution in a ratio of 1.5:5:20 by mass, and heat it to 60°C in a water bath to make chitosan undergo a swelling reaction, The mixture was swollen in a constant temperature magnetic stirrer for 300 min;

[0054] (2) 60% of (3-chloro-2-hydroxypropyl) trimethylammonium chloride was added dropwise to the mixture, wherein (3-chloro-2-hydroxypropyl) trimethylammonium chloride was the same as the step (1) The mass ratio of the mixture is 1.0:1, and the temperature of the water bath of the mixture is increased to 80°C, stirred in a constant temperature magnetic stirrer, and the stirring condition is 80°C for 8h;

[0055] (3) adjust the pH of the reaction mixture with 15% dilute HCl solution to keep the pH neutral;

[0056] (4) Collect the rea...

Embodiment 3

[0072] The preparation of quaternary ammonium functionalized chitosan / graphene oxide composite aerogel, the specific steps are as follows:

[0073] (1) Mix chitosan, sodium hydroxide aqueous solution with a concentration of 40% and isopropanol solution in a mass ratio of 1.3:3:15, and heat it to 50°C in a water bath to make the chitosan undergo a swelling reaction, The mixture was swollen in a constant temperature magnetic stirrer for 250 min;

[0074] (2) 60% of (3-chloro-2-hydroxypropyl) trimethylammonium chloride was added dropwise to the mixture, wherein (3-chloro-2-hydroxypropyl) trimethylammonium chloride was the same as the step (1) The mass ratio of the mixture is 0.5:1, and the temperature of the water bath of the mixture is increased to 70°C, stirred in a constant temperature magnetic stirrer, and the stirring condition is 70°C for 7 hours;

[0075] (3) adjust the pH of the reaction mixture with 10% dilute HCl solution to keep the pH neutral;

[0076] (4) Collect t...

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PUM

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Abstract

The invention discloses a decoloring method of remelt syrup, which comprises the following steps: mixing quaternary ammonium functionalized chitosan / graphene oxide composite aerogel with remelt syrup, and adsorbing pigment of the remelt syrup. The quaternary ammonium functionalized chitosan / graphene oxide composite aerogel is prepared by taking chitosan and graphene oxide as raw materials and 25% glutaraldehyde as a cross-linking agent and stripping the graphene oxide through a cross-linking polymerization method, and then amino on a chitosan molecular chain is subjected to graft modification and grafted with quaternary ammonium groups with positive charges. According to the invention, chitosan is used as a raw material to prepare the decolorizing agent for sugar, and graphene oxide solves the problem that pores are easy to collapse after quaternization of chitosan, so that the chitosan-based aerogel decolorizing agent has a rich pore structure and is coupled with a membrane-method green sugar production process; the problem that the color value of finished white granulated sugar is high due to the fact that small molecular pigments cannot be intercepted when remelt syrup is treated through a membrane separation technology is solved, the greening of the sugar manufacturing process is achieved, and meanwhile the quaternary ammonium functionalized chitosan / graphene oxide composite aerogel can be recycled after being subjected to decoloration treatment.

Description

technical field [0001] The invention belongs to the technical field of sugar-making engineering, in particular to a decolorization method for redissolving syrup. Background technique [0002] The state lists sugar, along with grain, cotton and oil, as important strategic materials related to the national economy and people's livelihood. my country's edible sugar is mainly divided into two categories, cultivated sugar and refined sugar. Cultivated white sugar refers to white granulated sugar produced by "one-step method" using sugarcane raw materials, and the product grade is superior grade white granulated sugar or first-class white granulated sugar. At present, the main production process for the production of refined sugar is the "two-step method". The sugar cane is first produced by the lime method to produce raw sugar for indirect consumption, and the raw sugar is redissolved and then further decolorized and clarified to produce a product with a grade of refined sugar. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C13B20/12
CPCC13B20/126
Inventor 谢文博李明星熊艳舒肖尧焦丽程莉芸韦伟李凯陆海勤李文
Owner GUANGXI UNIV
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