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Preparation method of tert-butyl acrylate

A technology of tert-butyl acrylate and acrylic acid, applied in the field of preparation of tert-butyl acrylate, can solve the problems of complex polymerization inhibitor and high reaction temperature, and achieve the effects of mild reaction, simple process and improved yield

Inactive Publication Date: 2020-05-05
TAICANG YUNTONG BIOCHEM ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this process still has defects such as complex inhibitors and high reaction temperature.

Method used

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  • Preparation method of tert-butyl acrylate
  • Preparation method of tert-butyl acrylate

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Put acrylic acid, catalyst, polymerization inhibitor and isobutylene into the reactor, under the conditions of temperature 30°C and pressure 1MPa, esterification reaction occurs at the volume space velocity of isobutylene 1.0 / h to synthesize tert-butyl acrylate;

[0023] Wherein, the molar ratio of acrylic acid, polymerization inhibitor and isobutylene is 1:0.1:0.5, the catalyst is a mixture of sulfonic acid type cation exchange resin and p-toluenesulfonic acid, the mass ratio of the two is 3:1, the total mass of the catalyst It is 10% of the mass of acrylic acid; the polymerization inhibitor is a mixture of tert-butylcatechol and tert-butanol, and the mass ratio of the two is 1:1.

Embodiment 2

[0025] Put acrylic acid, catalyst, polymerization inhibitor and isobutylene into the reactor, under the conditions of temperature 30°C and pressure 1MPa, esterification reaction occurs at the volume space velocity of isobutylene 1.0 / h to synthesize tert-butyl acrylate;

[0026] Wherein, the molar ratio of acrylic acid, polymerization inhibitor and isobutylene is 1:0.1:0.5, the catalyst is a mixture of sulfonic acid modified SBA-15 mesoporous molecular sieve and p-toluenesulfonic acid, the mass ratio of the two is 3:1, The total mass of the catalyst is 10% of the mass of acrylic acid; the polymerization inhibitor is a mixture of tert-butylcatechol and tert-butanol, and the mass ratio of the two is 1:1.

Embodiment 3

[0028] Put acrylic acid, catalyst, polymerization inhibitor and isobutylene into the reactor, under the conditions of temperature 30°C and pressure 1MPa, esterification reaction occurs at the volume space velocity of isobutylene 1.0 / h to synthesize tert-butyl acrylate;

[0029] Wherein, the molar ratio of acrylic acid, polymerization inhibitor and isobutylene is 1:0.2:0.8, the catalyst is a mixture of sulfonic acid modified SBA-15 mesoporous molecular sieve and p-toluenesulfonic acid, the mass ratio of the two is 3:1, The total mass of the catalyst is 8% of the mass of acrylic acid; the polymerization inhibitor is a mixture of tert-butylcatechol and tert-butanol, and the mass ratio of the two is 1:1.

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Abstract

The invention discloses a preparation method of tert-butyl acrylate, which comprises the following steps: acrylic acid, a catalyst, a polymerization inhibitor and isobutene are added into a reactor, and esterification reaction is carried out at 20-50 DEG C under the pressure of 1-3 MPa at the isobutene volume space velocity of 0.5-5.0 / h to synthesize tert-butyl acrylate, wherein the feeding molarratio of the acrylic acid to the polymerization inhibitor to the isobutene is 1: (0.05-0.2): (0.2-0.8), the catalyst is selected from at least one of strongly acidic cation exchange resin, p-toluenesulfonic acid and an acid group modified SBA-15 mesoporous molecular sieve, the polymerization inhibitor is a mixture of tert-butyl catechol and tert-butyl alcohol, and the mass ratio of tert-butyl catechol to tert-butyl alcohol is 1: (1-3). According to the preparation method of tert-butyl acrylate, through the combination of the special catalyst and the polymerization inhibitor, the yield of esterification reaction is greatly improved, the reaction temperature is reduced, and the reaction is milder, greener and more economical.

Description

technical field [0001] The invention relates to the technical field of organic synthesis, in particular to a preparation method of tert-butyl acrylate. Background technique [0002] Tert-butyl acrylate is an extremely important chemical basic raw material and intermediate. Because of its unique and highly active polar molecule, unsaturated double bond and carboxylate (-COOR) structure, it can be derived into many kinds It has a polymer formula with good performance, and can prepare plastic, cross-linked and other polymers through emulsion polymerization, solution polymerization, copolymerization and other processing methods. Its strong polymer cohesion, good transparency, and clear film formation make it have great potential in the modification of various chemicals. It is used in coatings, coatings, papermaking, non-woven fabrics, super absorbent materials, Detergents, synthetic fibers, synthetic rubber, plastics, leather, adhesives, etc. are more and more widely used. In ...

Claims

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Application Information

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IPC IPC(8): C07C67/04C07C67/62C07C69/54B01J31/10B01J31/02B01J31/26B01J29/03
CPCC07C67/04C07C67/62B01J31/10B01J31/0225B01J31/26B01J29/0308B01J2231/49C07C69/54
Inventor 张卫东
Owner TAICANG YUNTONG BIOCHEM ENG
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