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Synthesis of acrylic ester using organic sulfonicacid-heteropolyacid mixed catalytic system

A technology of acrylates and organic sulfonic acids, applied in organic compound/hydride/coordination complex catalysts, organic chemistry, preparation of organic compounds, etc., can solve problems such as corrosion of metal equipment, and achieve production costs lower than, The effect of reducing usage and reducing corrosion problems

Inactive Publication Date: 2006-05-24
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this type of catalyst still has the problem of corroding metal equipment when used alone

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Add 43g of acrylic acid, 56g of n-butanol, 1.0g of p-toluenesulfonic acid, 0.2g of phosphomolybdic acid and 0.1g of hydroquinone into a three-necked flask with a reflux water separator and a thermometer, and the reaction temperature is 116°C. In the water separator, water and butanol will be separated into layers, and 10 ml of water (theoretical water output is 10.75 ml) will be separated. The reaction time is 45 minutes, and the conversion rate of acrylic acid reaches 93%.

[0013] Under the same reaction conditions, p-toluenesulfonic acid-phosphomolybdic acid, p-toluenesulfonic acid, sulfuric acid, and phosphomolybdic acid were used to evaluate their catalytic activity according to the water effluent time. The experimental results are shown in Table 1. From the experimental results, it can be seen that when p-toluenesulfonic acid-phosphomolybdic acid is used as a mixed catalytic system, its catalytic activity is slightly higher than that of p-toluenesulfonic acid alone...

Embodiment 2

[0016] SUS-304 and SUS-316 stainless steel were used to make 20 × 15 × 2mm test pieces, which were polished, degreased, cleaned, and dried with metallographic sandpaper of different particle sizes in advance, and used an analytical balance (accurate to 0.0001g) before and after the experiment. ) and weighed, hang the test piece on a glass hook and put it into a 500ml three-necked flask equipped with a reflux condenser and a thermometer. The flask is equipped with 300g of experimental medium, which consists of 60.0% acrylic acid (mass fraction, the same below), formazan 35.0% butyl acrylate, 1.5% p-toluenesulfonic acid, 0.2% phosphomolybdic acid, 0.1% hydroquinone, and the rest is water. Heat to make the solution boil at a temperature of 120-124°C for 48 hours. Stainless steel Corrosion rate <0.05mm / a.

[0017] Under the condition that the above-mentioned other experimental conditions remain unchanged, when phosphomolybdic acid is not added to the experimental medium, p-toluene...

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PUM

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Abstract

The present invention relates to a method for synthesizing acrylic esters by using organic sulfoacid-heteropolyacid mixed catalysis system. The raw material for synthesizing acrylic esters can be acrylic acid, also can be methylacrylic acid, its used alcohol is C2-C8 aliphatic alcohol. It is characterized by that it uses organic fulfoacid as catalyst, and adds small quantity of heteropolyacid as corrosion inhibitor so as to form the invented mixed catalysis system.

Description

technical field [0001] The invention relates to an organic sulfonic acid-heteropolyacid mixed catalytic system for synthesizing acrylates. Belongs to the field of organic chemistry. Background technique [0002] Acrylates, such as methyl methacrylate, ethyl methacrylate, and butyl methacrylate, are important chemical raw materials and are widely used in organic synthesis, coatings, plastics, and adhesive industries. There are many production processes for the synthesis of acrylates, one of which is to react alcohols and methacrylic acid under the action of a catalyst at a certain reaction temperature, and the ester produced by the reaction is evaporated from the esterification kettle, and then decompressed Distillation to obtain the finished ester. [0003] Shao Yanqiu etc. introduced a kind of synthetic method of butyl acrylate in " the improvement of butyl acrylate synthesis method " (" Shenyang Chemical Industry " magazine, the 2nd phase in 2000, 70-71 pages), and the c...

Claims

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Application Information

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IPC IPC(8): B01J31/02B01J27/18C07C67/08C07C69/54
Inventor 刘文彬王军陈家林
Owner HARBIN ENG UNIV