Method for producing aqueous solution of glycolic acid

A glycolic acid aqueous solution and production method technology, applied in the separation/purification of carboxylic acid compounds, preparation of carboxylic acid esters/lactones, organic chemistry, etc., can solve the problems of low yield, short catalyst life, low product purity, etc. Achieve the effect of high yield, low production cost, high purity and yield

Inactive Publication Date: 2015-08-12
SHANGHAI HUAYI GRP CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The technical problem to be solved by the present invention is the problem of low yield, low product purity and short catalyst life in the prior art, and a new production method of glycolic acid aqueous solution is provided

Method used

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  • Method for producing aqueous solution of glycolic acid
  • Method for producing aqueous solution of glycolic acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The technique that the present invention produces glycolic acid by methyl glycolate comprises the steps:

[0028] 1) Inert Al 2 o 3 Porcelain balls are put into a fixed bed reactor, and methyl glycolate and water are mixed at a molar ratio of 1:10, and then enter the fixed bed reactor through a pump, with a space velocity of 2.5h -1 , the reaction temperature is 70°C, the reaction pressure is normal pressure, the conversion rate of methyl glycolate at the outlet of the fixed bed is 30.4%, and the selectivity of glycolic acid is 100%. The packing in the distillation is θ ring, the catalyst is 001*7, and the liquid hourly space velocity is 2.5h -1 , the number of theoretical plates is 25, the feeding position is at the 10th theoretical plate, the reaction area is at the 8th to 16th theoretical plate, the reflux ratio is 1:1, the vacuum degree is 50kPa, the reboiler temperature of the tower kettle is 80°C, the reaction process The discharge pipeline at the top of the mi...

Embodiment 2

[0030] According to the conditions and steps described in Example 1, change the type of catalyst in the continuous reaction rectification unit, specifically including 001*7, 001*14.5, D-72, NKC-9, Amberlyst 35, etc., the conversion rate of methyl glycolate was 99.0%, and the selectivity of glycolic acid was 99%.

Embodiment 3

[0032] According to the conditions and steps described in Example 1, the reactive distillation column adopts fillers of SM700, SM350, and SM500 mixed fillers, and the volume ratio of SM700, SM350, and SM500 is 1:1:1, and the final methyl glycolate conversion rate is 100%. , Glycolic acid selectivity 96.7%.

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Abstract

The invention relates to a method for producing an aqueous solution of glycolic acid, and mainly solves the problems of low yield and low product purity in the prior art. The method for producing the aqueous solution of glycolic acid is as below: conducting hydrolysis reaction on the raw materials of methyl glycolate and water in a fixed bed reactor under autocatalysis conditions without a catalyst at the reaction temperature of 60-80 DEG C, atmospheric pressure and liquid hourly space velocity of 0.4-3.0 / h; sending the fixed bed reactor outlet products into a reaction distillation column; and continuously extracting methanol and water condensate from the top of the reaction distillation column. The technical scheme of continuous extraction of aqueous solution of glycolic acid can solve the above problems, and can be applied to the production of aqueous solution of glycolic acid.

Description

technical field [0001] The invention relates to a production method of glycolic acid aqueous solution. Background technique [0002] With the increasing shortage of petroleum resources, the development of C1 chemical industry based on natural gas and coal-based raw materials has important practical significance for our country. Remarkable results have been achieved, and the further development of the downstream product chain of methyl glycolate has become a hot spot and focus of research in this field. [0003] Glycolic acid was mainly used in the manufacture of boiler descaling agents and cleaning agents in the past. In recent years, it has been widely used in cosmetics and pharmaceuticals, and it has also attracted attention as a raw material for polyglycolic acid. Commercially available glycolic acid products include 70% glycolic acid solution and glycolic acid crystals. The industrial grade 70% glycolic acid solution contains a certain amount of methoxyacetic acid and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C59/06C07C51/09C07C51/44
CPCC07C51/09C07C51/44C07C59/06
Inventor 于鹏浩蔡清白陈建伟孙佳仕侯世敏邵锋张新平唐勇张春雷
Owner SHANGHAI HUAYI GRP CO
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