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Uses of benzoic acid stannous as catalyst

A stannous benzoate and catalyst technology, applied in physical/chemical process catalysts, organic compound/hydride/coordination complex catalysts, organic chemistry, etc., can solve low yield, yellow product color, and oligomerization rate Slow and other problems, to achieve the effect of high yield, high product melt index, mild polymerization reaction speed

Active Publication Date: 2009-07-29
ZHEJIANG HISUN BIOMATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims at the shortcomings of the existing catalysts that the oligomerization rate of lactic acid and glycolic acid is slow, and the products are easily coked into blocks in the reactor during the cracking reaction process, the color of the obtained product is yellow, and the yield is relatively low, so it provides benzene Use of stannous formate as oligomerization and cracking catalyst

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Take by weighing 10Kg of L-lactic acid aqueous solution (concentration is 88wt%) and put into 10 liters of there-necked flasks, add 30g stannous benzoate catalyst (0.3wt%), reduce pressure, heat up and dehydrate, dehydration temperature is controlled at 120~180 ℃, Dehydration under reduced pressure in the later stage forms oligomers, and the reaction is completed in 8 hours. Switch the receiving device, collect L-lactide by cracking under reduced pressure at 180-240°C, and complete in 6 hours to obtain 6.5Kg of crude L-lactide, the product yield is 92%, and the melting point of the product is 94°C.

Embodiment 2

[0034]Take by weighing 10Kg of L-lactic acid aqueous solution (concentration is 88wt%) and put into 10 liters of three-necked flasks, add 5g stannous benzoate catalyst (0.05wt%), depressurize, heat up and dehydrate, dehydration temperature is controlled at 120~180 ℃, Dehydration under reduced pressure in the later stage forms oligomers, and the reaction is completed in 10 hours. Switch the receiving device, and collect L-lactide by cracking under reduced pressure at 180-240°C. After 8 hours, 6.2Kg of crude L-lactide is obtained, the product yield is 88%, and the melting point of the product is 93°C.

Embodiment 3

[0036] Weigh 10Kg of L-lactic acid aqueous solution (concentration is 88wt%) and put it into a 10-liter three-necked flask, add 100g of stannous benzoate catalyst (1wt%), decompress, heat up and dehydrate, and the dehydration temperature is controlled at 120~180°C. Dehydration under reduced pressure resulted in the formation of oligomers, and the reaction was complete in 7 hours. Switch the receiving device, and collect L-lactide by cracking under reduced pressure at 180-240°C. After 5 hours, 6.6Kg of crude L-lactide is obtained, the product yield is 94%, and the melting point of the product is 94°C.

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Abstract

The invention mainly relates to the usage of benzoic acid stannous, in particular to the usage of the benzoic acid stannous as a catalyst for the oligomer pyrolysis. The oligomer is one of lact-acid oligomer or oligomeric hydroxyacetic acid. The lact-acid oligomer cracks to generate lactide, and the oligomeric hydroxyacetic acid cracks to generate glycolide.

Description

[0001] This application is a divisional application with application number 200610049288.7, application date January 27, 2006, and invention name "Use of stannous benzoate as a catalyst". technical field [0002] The present invention relates to the purposes of stannous benzoate, relate in particular to the purposes of stannous benzoate in catalyst field. Background technique [0003] Catalyst refers to a substance that can change the reaction rate in a chemical reaction, but its quality and chemical composition do not change before and after the reaction; under the action of the catalyst, the reaction temperature, time and pressure can be greatly reduced. [0004] Under the action of a catalyst, lactic acid or glycolic acid is dehydrated to form an oligomer with a molecular weight of 2,000 to 10,000, and then directly cracked at high temperature and distilled under reduced pressure to obtain crude lactide or crude glycolide. Commonly used catalysts for dehydration oligomeri...

Claims

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Application Information

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IPC IPC(8): C07D319/12B01J31/04C08G63/664C08G63/78C08G63/82
CPCC07D319/12
Inventor 边新超白骅陈志明庄秀丽黄景琴项盛梁奇志陈学思陈文启
Owner ZHEJIANG HISUN BIOMATERIALS
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