Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for synthesizing unsaturated isopropyl gadoleate

An isopropyl enoate, unsaturated technology, applied in chemical instruments and methods, preparation of carboxylic acid esters, preparation of organic compounds, etc., can solve the problems of difficult recovery and reuse of catalysts, difficult treatment of reaction waste liquid, and equipment corrosion. , to achieve the effect of high selectivity, less by-products and high conversion rate

Active Publication Date: 2011-09-07
NANJING RESOURCES & ENVIRONMENT ENG TECH RES INST CO LTD
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This acid alcohol esterification synthesis process has problems such as long process, serious equipment corrosion, difficult recovery and reuse of catalysts, and difficult treatment of reaction waste liquid.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for synthesizing unsaturated isopropyl gadoleate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] In a 0.3L reactor, add 100g of methacrylic acid, 0.5g of hydroquinone and 4g of sulfonic acid group strongly acidic styrene-based cation exchange resin catalyst, the reaction temperature is 100°C, the reaction pressure is 0.7MPa, and the stirring speed is 800rpm , Continuously feed propylene at a rate of 12.81g / h for 4h. After the reaction, the catalyst was recovered by filtration. The filtrate was the reaction product, weighing 151.8 g. The product was analyzed by gas chromatography. The conversion rate of methacrylic acid was 99.3%. Calculated by propylene, the selectivity of isopropyl methacrylate was 94.7%.

Embodiment 2

[0016] In a 0.3L reactor, add 100g of methacrylic acid, 3g of hydroquinone, 2g of copper dibutylthiocarbamate and 15g of sulfonic acid group strongly acidic styrene-based cation exchange resin as a catalyst, and the reaction temperature is 60°C. The pressure was 0.2MPa, the stirring speed was 1200rpm, and propylene was continuously introduced at a rate of 4.64g / h for 10h. After the reaction, the catalyst was recovered by filtration. The filtrate was the reaction product, weighing 151.4 g. The product was analyzed by gas chromatography. The conversion rate of methacrylic acid was 95.1%. Calculated by propylene, the selectivity of isopropyl methacrylate was 98.0%.

Embodiment 3

[0018] In a 0.3L reactor, add 100g of methacrylic acid, 1g of hydroquinone methyl ether and 0.1g of sulfonic acid group strongly acidic styrene-based cation exchange resin as a catalyst, the reaction temperature is 160°C, the reaction pressure is 3MPa, and the stirring speed is At 1000rpm, propylene was continuously introduced at a rate of 5.53g / h for 9h. After the reaction, the catalyst was recovered by filtration. The filtrate was the reaction product, weighing 150.8 g. The product was analyzed by gas chromatography. The conversion rate of methacrylic acid was 96.5%. Calculated by propylene, the selectivity of isopropyl methacrylate was 94.8%.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a method for synthesizing unsaturated olefin acid isopropyl. Unsaturated olefin acid of C3-C4 is directly subject to the addition esterification with propylene under the action of catalyst to synthesize the unsaturated olefin acid isopropyl. The acid transformation ratio of the reaction reaches more than 95 percent, isopropyl selectivity achieves more than 95 percent calculated on the basis of the propylene, and the mass fraction of a final product is more than 99.5 percent. The method adopts that the unsaturated olefin acid is directly subject to the addition esterification reaction with the propylene, which belongs to the atom-economic reaction; atoms of reactants basically and entirely enter the product, so the method has high transformation ratio, high selectivity, and fewer byproducts; and no waste water is generated during the whole reaction press. The catalyst and the product have simple separation, and the catalyst can be repeatedly utilized.

Description

technical field [0001] The invention belongs to the field of synthesis of unsaturated ethylenic acid esters, in particular to a method for synthesizing unsaturated ethylenic acid isopropyl esters by reacting unsaturated ethylenic acid containing 3 to 4 carbon atoms with propylene. Background technique [0002] Containing 3 to 4 carbon atoms (C3 to C4) unsaturated isopropyl acrylate mainly refers to isopropyl acrylate, isopropyl methacrylate and isopropyl 2-butenoate. Unsaturated ethylenic acid ester is an extremely important basic raw material and intermediate in organic chemical industry. It is a unique and highly active polar molecule. Because of its unsaturated double bond and carboxyl structure, it can be processed by emulsion polymerization, solution polymerization, copolymerization, etc. Prepare polymers with good properties such as plasticity and crosslinking. It is widely used in coatings, synthetic fibers, synthetic rubber, plastics, leather, paper, adhesives, pack...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C07C69/54C07C69/56C07C67/08
Inventor 崔咪芬乔旭王萍汤吉海陈献
Owner NANJING RESOURCES & ENVIRONMENT ENG TECH RES INST CO LTD