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Production method of 1, 2-propylene glycol diacetate

A technology for the production of propylene glycol diol, which is applied to the preparation of carboxylic acid esters, chemical instruments and methods, and the preparation of organic compounds. Excellent industrial application value, reduction of solid pollutants and waste water discharge, and simple operation

Inactive Publication Date: 2013-12-25
JIANGSU HUALUN CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

High pressure (0.4-0.6Mpa) is required for the reaction of defects; the reaction temperature is high (130-135°C); the batch reaction in a reactor is low in efficiency and yield, which is not conducive to large-scale production; the drop-feeding method is slow and the process is complicated

Method used

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Embodiment Construction

[0011] 1. Preparation of catalyst:

[0012] 1. Please introduce the preparation method of the catalyst in detail:

[0013] Will 732 # The ion exchange resin is washed with deionized water until clear water flows out, soaked in 4% NaOH for 8-12 hours, then washed with deionized water until neutral, and then soaked in 5% hydrochloric acid for 8-12 hours to obtain H + type resin. Take ZnCl with a mass fraction of 0.1% to 10% 2 , FeCl 3 , AlCl 3 , NaCl, FeCl 2 Or a solution in KCl, ion-exchange with ion-exchange resin at a certain temperature, and finally wash with deionized water until there is no Cl - Existence, dried in a vacuum oven to constant weight, obtained modified ion exchange resin catalyst.

[0014] 2. The characteristics of the catalyst:

[0015] It has the characteristics of metal ions, enhanced type, and macropores.

[0016] 2. Production of 1,2-propanediol diacetate (PGDA):

[0017] In a fixed bed reactor, mix propylene glycol methyl ether and acetic ...

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Abstract

The invention provides a production method of 1, 2-propylene glycol diacetate, and relates to a chemical synthesis technology. The production method comprises the following steps of carrying out esterification reaction by using propylene glycol monomethyl ether and acetic acid as raw materials in the existence of a catalyst, and rectifying a produced 1, 2-propylene glycol diacetate crude product so as to obtain the high-quality 1, 2-propylene glycol diacetate product, wherein the catalyst is a styrene-divinyl benzenesulfonic acid type acid cation exchange resin which is modified by metal ions and has compound enhancement type macropores, and the cation exchange resin is prepared by sulfonating on a benzene ring after polymerizing styrene and a divinyl benzene monomer, and an ion is any one of Zn<2+>, Fe<3+>, Al<3+>, Na<+>, Fe<2+> or K<+>. The production method has the advantages that the adopted catalyst has high activity and long service life, the selectivity and the yield of the product are high, few byproducts are generated, and after the catalyst is inactivated, the catalyst is filtered, recovered, subjected to acid treatment and dried so as to be recycled.

Description

technical field [0001] The invention relates to chemical synthesis technology, in particular to the technical field of production of 1,2-propanediol diacetate. Background technique [0002] 1,2-Propanediol diacetate (PGDA) is an important industrial solvent. The solvent has a unique molecular structure. Polar substances have good solubility. It has the characteristics of high solubility (can dissolve cellulose and polymer substances), good thermal stability, small viscosity change, low toxicity and low corrosion. It is widely used as a solvent in ink, paint, plastics, spices, medicine and other industries, such as a retarding solvent in automobile baking varnish and a solvent for phenolic resin baking paint. [0003] "Green Chemical Approach to Synthesis of 1,2-Propanediol Diacetate by Embedding Propylene Oxide in Acetic Anhydride" reports a method for synthesizing propylene glycol methyl ether diacetate in an autoclave with acetic anhydride and propylene oxide. High pres...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C69/16C07C67/24B01J31/10
Inventor 吴义彪陈忠平吴增才许飞李冬春潘学林
Owner JIANGSU HUALUN CHEM
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