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Process for synthesizing propylene glycol monomethyl ether acetate (PMA)

A technology of propylene glycol methyl ether acetate and propylene glycol methyl ether, which is applied in the production process field of propylene glycol methyl ether acetate, can solve problems such as polluting the environment and affecting products, and achieves high activity, improved selectivity and conversion rate, and good selectivity Effect

Active Publication Date: 2005-11-23
JIANGSU HUALUN CHEM
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The present invention has carried out the development and research of a new catalyst for the problems of polluting the environment and affecting products by using traditional sulfuric acid catalysts in the synthesis of PMA

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0015] (1) After adding 18 tons of propylene glycol methyl ether (PM), 12.1 tons of acetic acid, and 500 kilograms of entrainer toluene in the esterification reactor, add 122 kilograms of p-toluenesulfonic acid.

[0016] (2) heating up to 103 degrees for reaction, dehydration is carried out simultaneously, and water and toluene are separated. After 16-20 hours of esterification reaction, the reaction temperature rises to 150 degrees again. After the esterification reaction is completed, the reaction materials are input into the light removal tower. Recover excess propylene glycol methyl ether while pumping the reactants to the rectification tower.

[0017] (3) After rectifying the reactants, the residual liquid in the rectification tower is collected and filled into barrels for measurement, (discharge of 300 tons of products is about 3 tons of residual liquid), and the initial 5 batches of ester When feeding the reaction, use a new type of esterification catalyst to obtain 2...

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Abstract

The invention relates to a process for synthesizing propylene glycol monomethyl ether acetate, which comprises subjecting propylene glycol methyl ether, acetic acid and toluene to esterification reaction at the presence of methyl benzene sulfonic acid catalyst, then reclaiming the excess propylene glycol methyl ether with dealkylation tower and rectifying, thus obtaining propylene glycol methyl ether acetic ester.

Description

technical field [0001] The invention relates to a production process of propylene glycol methyl ether acetate. Background technique [0002] Propylene Glycol Methyl Ether Acetate (PMA) is an important advanced solvent, which has a strong dissolving ability for polar and non-polar substances. Its solubility is much higher than general solvents and propylene glycol ether and glycol ether solvents, and it has good miscibility with water. PMA can be used as a solvent for cellulose, polymers, rubber and natural macromolecules. Because propylene glycol methyl ether acetate has the characteristics of high solubility, good environmental performance, excellent thermal stability, and small viscosity change, it is widely used in the fields of coatings, inks, printing and dyeing, and pesticides, and is replacing the more toxic glycol ether. and its ester solvents. [0003] At present, the industry mainly uses propylene glycol methyl ether (PM) and acetate to synthesize PMA, and the t...

Claims

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Application Information

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IPC IPC(8): C07C69/16
Inventor 吴义彪陈忠平
Owner JIANGSU HUALUN CHEM
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