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Method for preparing sorbic acid through photo-efficient catalytic isomerization

A technology of sorbic acid and isomerization, which is applied in the field of preparing sorbic acid by light-efficient catalytic isomerization, can solve the problems of incomplete depolymerization of polyester, large amount of acid-containing wastewater, and long reaction time, so as to increase yield, The effect of reducing the amount of by-product tar and easy operation

Active Publication Date: 2020-07-24
江苏润普食品科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method usually cannot completely depolymerize the polyester, the reaction time is long, the reaction temperature is high, and the amount of acid-containing wastewater is large
[0007] Patent CN110642698A discloses a production method for preparing sorbic acid by acidolysis of sorbic acid polyester. The acidolysis method is used to prepare sorbic acid. The by-product rate of final tar is still very high. In addition, the preparation time is long and the yield per unit time is not high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The preparation method of described solid base catalyst is as follows:

[0030] (1) Ion exchange resin pretreatment

[0031] Wash the macroporous anion resin with water and methanol respectively, soak in 0.015mol / L EDTA solution, let stand for 6h, filter, and dry at 30°C for 6h;

[0032] (2) PdCl 2 Dissolved in 25% ethanol mixed solvent to prepare a 0.15wt% solution, then impregnated the pretreated ion exchange resin for 12 hours, and dried at 30°C for 10 hours to obtain the loaded anion exchange resin.

[0033] The method for preparing sorbic acid by described light-efficient catalytic isomerization comprises the following steps:

[0034] (1) Put 200g of sorbic acid polyester into the reaction kettle, add 250g of deionized water, turn on the ultraviolet light source, the light intensity is 600Lux, put in 20g of loaded anion exchange resin, stir, heat up to the catalytic temperature of 70°C, and the alkali catalysis time 20min;

[0035] (2) after completion of the r...

Embodiment 2

[0052] The preparation method of described solid base catalyst is as follows:

[0053] (1) Ion exchange resin pretreatment

[0054] Wash the macroporous anion resin with water and methanol respectively, soak in 0.015mol / L EDTA solution, let stand for 6h, filter, and dry at 30°C for 6h;

[0055] (2) Dissolve the raw material containing platinum ions in 25% ethanol mixed solvent to prepare a 0.15wt% solution, then impregnate the pretreated ion exchange resin for 12h, and dry at a constant temperature of 30°C for 10h to obtain the loaded anion exchange resin.

[0056] The method for preparing sorbic acid by described light-efficient catalytic isomerization comprises the following steps:

[0057] (1) Put 200g of sorbic acid polyester into the reaction kettle, add 250g of deionized water, turn on the white LED light source, the light intensity is 800Lux, put in 15g of loaded anion exchange resin, stir, heat up to the catalytic temperature of 70°C, and base catalysis Time 20min; ...

Embodiment 3

[0061] The preparation method of described solid base catalyst is as follows:

[0062] (1) Ion exchange resin pretreatment

[0063] Wash the macroporous anion resin with water and methanol respectively, soak in 0.01mol / L EDTA solution, let stand for 20h, filter, and dry at 30°C for 10h;

[0064] (2) Dissolve the raw material containing zinc ions in 50% ethanol mixed solvent to prepare a 0.50wt% solution, then impregnate the pretreated ion exchange resin for 12h, and dry at a constant temperature of 30°C for 10h to obtain the loaded anion exchange resin.

[0065] The method for preparing sorbic acid by described light-efficient catalytic isomerization comprises the following steps:

[0066] (1) Put 200g of sorbic acid polyester into the reaction kettle, add 250g of deionized water, turn on the green LED light source, the light intensity is 800Lux, put in 15g of loaded anion exchange resin, stir, heat up to the catalytic temperature of 70°C, and base catalysis Time 10min;

...

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Abstract

The invention belongs to the technical field of preparation of sorbic acid, and particularly relates to a method for preparing sorbic acid through photo-efficient catalytic isomerization, and the method comprises the following steps: (1) putting sorbic acid polyester into a reaction kettle, adding deionized water, turning on a light source, putting a solid base catalyst, stirring and heating to react; (2) after the reaction is finished, filtering while hot to obtain a sorbic acid aqueous solution; (3) cooling, crystallizing, washing and drying to obtain the sorbic acid, wherein the solid basecatalyst is supported anion exchange resin, macroporous anion resin is taken as a carrier, EDTA (Ethylene Diamine Tetraacetic Acid) is taken as a complexing medium, palladium, platinum, zinc or copperions are supported, and the loading capacity is 0.1-1wt%. According to the method, the photocatalysis technology is simple and convenient to operate and environmentally friendly, the adopted supported ion exchange resin is high in alkalinity and short in catalytic reaction time, the production efficiency is improved, meanwhile, the supported metal ions and a light source have a synergistic promotion effect on isomerization, and the amount of byproduct tar can be further reduced.

Description

technical field [0001] The invention belongs to the technical field of preparation of sorbic acid, and in particular relates to a method for preparing sorbic acid by light-efficient catalytic isomerization. Background technique [0002] Sorbic acid (Sorbic acid), the chemical formula is C 6 h 8 o 2 , also known as herbal tea acid, 2,4-hexadienoic acid, 2-propenyl acrylic acid. It is a food additive that has an inhibitory effect on many fungi such as yeast and mold. It is also used in animal feed, cosmetics, pharmaceuticals, packaging materials and rubber additives. [0003] Sorbic acid has 4 isomers, trans-trans isomers (E-E), cis-cis isomers (Z-Z), trans-cis isomers (E-Z) and cis-trans isomers (Z-E), where trans -The anti-isomer is the active ingredient of sorbic acid. The other three isomers account for 8-20%, are more sensitive to oxygen in the air, and are easily oxidized, gelled, and discolored as a by-product "tar", which reduces the yield and quality of sorbic a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/08C07C51/09C07C57/10
CPCC07C51/09B01J31/08B01J2231/4288B01J35/39C07C57/10
Inventor 付强陈艳艳熊新国官凤钢刘宗飞
Owner 江苏润普食品科技股份有限公司
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