Production method for preparing sorbic acid by catalyzing depolymerization of sorbic acid polyester with solid base catalyst

A catalyst technology for catalyzing sorbic acid and solid base catalysts, which is applied in catalyst activation/preparation, carboxylate/lactone preparation, molecular sieve catalysts, etc. It can solve the problems of incomplete depolymerization of polyester, large amount of acid-containing wastewater, and reaction temperature. Advanced problems, to achieve the effect of mild reaction temperature, high atom economy and high catalytic activity

Inactive Publication Date: 2020-07-28
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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Solid base catalyst preparation:

[0030] (1) Immerse the 13X molecular sieve in the ammonium fluoride solution with a solubility of 2.5%, place it on a magnetic stirrer and stir for 1 hour, filter it with suction, oven dry at 150°C for 2 hours, place it in a muffle furnace and roast it for 4 hours at a temperature of 650°C to obtain a large-diameter solid alkali carrier with an average pore diameter of 3.5nm;

[0031] (2) Configure KNO with a concentration of 10wt% 3 , impregnated with the prepared macroporous solid alkali carrier in vacuum equal volume, impregnated for 12 hours, dried at 100°C, and roasted at 550°C to obtain a strongly basic solid alkali catalyst.

[0032] Described solid base catalyst catalyzes the production method of sorbic acid polyester depolymerization and prepares sorbic acid, comprises the following steps:

[0033] (1) Put 200g of sorbic acid polyester into the flask, add 30g of deionized water, put in 15g of solid alkali catalyst, stir, hea...

Embodiment 2

[0038] Solid base catalyst preparation:

[0039] (1) Immerse the KL molecular sieve in an ammonium fluoride solution with a solubility of 2.5%, place it on a magnetic stirrer and stir for 1 hour, filter it with suction, oven dry at 150°C for 2 hours, place it in a muffle furnace and roast it for 4 hours at a temperature of 650°C to obtain a large-diameter solid alkali carrier with an average pore diameter of 3.5nm;

[0040] (2) Prepare KOH with a concentration of 10wt%, impregnate with the prepared large-pore solid base carrier in vacuum equal volume for 12 hours, dry at 100°C, and roast at 550°C to obtain a strongly basic solid base catalyst.

[0041] Described solid base catalyst catalyzes the production method of sorbic acid polyester depolymerization and prepares sorbic acid, comprises the following steps:

[0042] (1) Put 200g of sorbic acid polyester into the flask, add 30g of deionized water, put in 15g of solid alkali catalyst, stir, heat up to the catalytic temperatu...

Embodiment 3

[0047] Solid base catalyst preparation:

[0048] (1) Immerse the KL molecular sieve in an ammonium fluoride solution with a solubility of 2.5%, place it on a magnetic stirrer and stir for 1 hour, filter it with suction, oven dry at 150°C for 2 hours, place it in a muffle furnace and roast it for 4 hours at a temperature of 650°C to obtain a large-diameter solid alkali carrier with an average pore diameter of 3.0 nm;

[0049] (2) Prepare KOH with a concentration of 15wt%, impregnate with the prepared large-pore solid base carrier in vacuum equal volume for 12 hours, dry at 100° C., and roast at 550° C. to obtain a strongly basic solid base catalyst.

[0050] Described solid base catalyst catalyzes the production method of sorbic acid polyester depolymerization and prepares sorbic acid, comprises the following steps:

[0051] (1) Put 200g of sorbic acid polyester into the flask, add 30g of deionized water, put in 20g of solid alkali catalyst, stir, heat up to the catalytic temp...

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Abstract

The invention belongs to the technical field of preparation of sorbic acid and relates to a production method for preparing sorbic acid by catalyzing depolymerization of sorbic acid polyester with a solid base catalyst. The production method comprises the following steps: (1) putting sorbic acid polyester into a reaction kettle, then adding deionized water and the solid base catalyst, stirring, heating to a catalytic temperature of 30-60 DEG C, and carrying out a base catalytic reaction for 10-20 min, (2) after the reaction is finished, raising the temperature to 100-150 DEG C for sublimation,and condensing and collecting sorbic acid to obtain a crude sorbic acid product, and (3) washing the crude sorbic acid with hot water at 80-100 DEG C, cooling, crystallizing and drying to obtain sorbic acid, wherein the solid base catalyst is a catalyst which takes a molecular sieve as a carrier and is loaded with an alkali metal compound. The method does not generate a waste liquid, has the advantages of environment friendliness, cleanness, high atom economy and no three wastes, is mild in reaction and low in energy consumption, and can increase the yield of sorbic acid and reduce tar byproducts.

Description

technical field [0001] The invention belongs to the technical field of sorbic acid preparation, in particular to a production method for preparing sorbic acid by catalyzing the depolymerization of sorbic acid polyester with a solid base catalyst. 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] At present, the preparation of sorbic acid by depolymerizing sorbic acid polyester is a common preparation process, and the conversion of sorbic acid from sorbic acid polyester usually includes alkali-acid hydrolysis and acid hydrolysis. [0004] The alkali-acid hydrolysis method is to convert sorbic acid polyester into sorbic acid in two steps. The first step ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C51/09C07C27/02C07C57/10B01J29/08B01J29/60B01J35/10B01J37/02
CPCB01J29/082B01J29/60B01J35/1061B01J37/0201B01J2229/186C07C51/09C07C57/10
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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