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Production of methacrylic acid

A technology of methacrylic acid and methacrylamide, which is applied in the direction of organic chemistry, can solve the problems of low product purity and yield, low equipment utilization rate, difficult reaction control, etc. shortened, fully responsive effect

Inactive Publication Date: 2005-12-28
PEN MAKING FACTORY SHANGHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of the batch reaction method is that the reaction cycle is long and the utilization rate of equipment is low; also because the exothermic and endothermic reactions are carried out in the same reactor, the reaction is difficult to control, especially the phenomenon of incomplete reaction in the first step, As a result, the product purity and yield are relatively low

Method used

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Examples

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Embodiment

[0009] Put sulfuric acid and acetone cyanohydrin into the reaction pot through the rotameter at a ratio of 2:1 (weight ratio), because the reaction at this time is an exothermic reaction, so turn on the cooling system to keep the temperature in the pot at 90°C-100°C , the product overflows from the overflow port of the reaction pot and enters the tubular reactor; the above-mentioned reaction product continues to undergo a chemical reaction with sulfuric acid in the tubular reactor. This reaction is an endothermic reaction and is heated to 130°C-140°C with steam , Because the temperature is too low, the chemical reaction is unsafe, and the purity is too high, it is easy to cause polymerization or carbonization, so controlling the temperature is the key factor; in order to make the reaction tend to be complete, the product will enter the incubator again, and the holding temperature is controlled at about 135 ℃; Then the cooled material enters the amide acceptor, and the flow proc...

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Abstract

Production of methacrylic acid consists of amidation, hydrolytic reaction and distillation purification. It is characterized by using a set of continuous reactor comprising reaction vessel, tubing reactor, thermal insulating device and amide acceptor. Its advantages include easy reacting temperature control, short reacting period and higher productivity.

Description

technical field [0001] The invention relates to fine chemical industry, in particular to a method for producing methacrylic acid. Background technique [0002] The basic method of producing methacrylic acid is to put sulfuric acid and acetone cyanohydrin into the reaction pot for amidation reaction to generate methacrylamide, then carry out hydrolysis reaction to generate methacrylic acid, and finally carry out distillation and purification. Amidation reaction is an important process in the production process of methacrylic acid. There are two chemical reaction processes in the amidation reaction: the first step is to react sulfuric acid with acetone cyanohydrin to generate α-formamidoisopropyl hydrogen sulfate, which is an exothermic reaction, and the heat of formation is 60kcal / mol; In the second step, the α-formamido isopropyl hydrogen sulfate generated in the first step continues to react with sulfuric acid to generate methacrylamide. This stage is an endothermic reacti...

Claims

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Application Information

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IPC IPC(8): C07C57/04
Inventor 黄海荣奚德明陈建生
Owner PEN MAKING FACTORY SHANGHAI
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