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Combined production method of methacrylamide and methyl methacrylate

A technology of methyl methacrylate and methacrylamide, which is applied in the field of joint production of methacrylamide and methyl methacrylate, to achieve the effects of increased yield, high yield and easy operation

Active Publication Date: 2015-02-18
CHONGQING UNISPLENDOUR CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the present invention provides a method for the joint production of methacrylamide and methyl methacrylate, which can solve the problem of the mother liquor containing methacrylamide extracted in the process of producing methacrylamide, and reduce the production of methacrylamide. Loss of amides, reduced waste water discharge

Method used

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  • Combined production method of methacrylamide and methyl methacrylate

Examples

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Effect test

Embodiment 1

[0029] 1) Put concentrated sulfuric acid (1403 kg) and acetone cyanohydrin (850 kg) through the rotameter, and put them into the reaction kettle according to the ratio of 1.65:1 (mass ratio), and the acetone cyanohydrin and concentrated sulfuric acid will be hydrolyzed to form α-formamide Base isopropyl hydrosulfate, because the reaction at this time is an exothermic reaction, so the cooling system is turned on to keep the reaction temperature in the pot at 90°C, and the product overflows from the overflow of the reactor and enters the tubular reactor;

[0030] 2) The above reactants continue to react with concentrated sulfuric acid in the tubular reactor, and α-formamidoisopropyl hydrogen sulfate is dehydrated under the action of concentrated sulfuric acid to form methacrylamide sulfate. This reaction is endothermic Reaction, heated to 130°C with steam, because the temperature is too low, the chemical reaction is incomplete, and the temperature is too high, it is easy to cause...

Embodiment 2

[0037] 1) Put concentrated sulfuric acid (1403 kg) and acetone cyanohydrin (850 kg) through the rotameter, and put them into the reaction kettle according to the ratio of 1.65:1 (mass ratio), and the acetone cyanohydrin and concentrated sulfuric acid will be hydrolyzed to form α-formamide Base isopropyl hydrosulfate, because the reaction at this time is an exothermic reaction, so the cooling system is turned on to keep the reaction temperature in the pot at 90°C, and the product overflows from the overflow of the reactor and enters the tubular reactor;

[0038] 2) The above reactants continue to react with concentrated sulfuric acid in the tubular reactor, and α-formamidoisopropyl hydrogen sulfate is dehydrated under the action of concentrated sulfuric acid to form methacrylamide sulfate. This reaction is endothermic Reaction, heated to 130°C with steam, because the temperature is too low, the chemical reaction is incomplete, and the temperature is too high, it is easy to cause...

Embodiment 3

[0046] 1) Put concentrated sulfuric acid (1403 kg) and acetone cyanohydrin (850 kg) through the rotameter, and put them into the reaction kettle according to the ratio of 1.65:1 (mass ratio), and the acetone cyanohydrin and concentrated sulfuric acid will be hydrolyzed to form α-formamide Base isopropyl hydrosulfate, because the reaction at this time is an exothermic reaction, so the cooling system is turned on to keep the reaction temperature in the pot at 90°C, and the product overflows from the overflow of the reactor and enters the tubular reactor;

[0047] 2) The above reactants continue to react with concentrated sulfuric acid in the tubular reactor, and α-formamidoisopropyl hydrogen sulfate is dehydrated under the action of concentrated sulfuric acid to form methacrylamide sulfate. This reaction is endothermic Reaction, heated to 130°C with steam, because the temperature is too low, the chemical reaction is incomplete, and the temperature is too high, it is easy to cause...

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Abstract

The invention discloses a combined production method of methacrylamide and methyl methacrylate. The combined production method comprises the following steps of: with acetone cyanohydrin as a main raw material, generating methacrylamide sulfate through actions of concentrated sulfuric acid hydrolysis, dehydration and the like, neutralizing the methacrylamide sulfate by using ammonia and ammonia water, and circulating at least part of neutralized mother liquor and aqueous methanol recovered in purification of a crude methacrylamide product to an esterification step for producing the methyl methacrylate, wherein the mother liquor and the aqueous methanol are used for producing the methyl methacrylate. According to the combined production method, the methacrylamide in the mother liquor can be sufficiently utilized again to be converted into the methyl methacrylate, so that the loss of the methacrylamide is reduced, the yield of the methyl methacrylate is improved and the emission of the wastewater is reduced; and in addition, the neutralized mother liquor can be used for preventing impurities from accumulating in the process of purifying the methyl methacrylate, meanwhile, the recovered aqueous methanol does not need to be rectified and can be directly used for producing the methyl methacrylate, and therefore the investment of methanol rectification equipment is saved.

Description

technical field [0001] The invention relates to a joint production method of methacrylamide and methyl methacrylate. Background technique [0002] Methyl methacrylate is a monomer for the production of plexiglass, and it is one of the few macromolecular monomers produced in large tonnages in the world. At present, the practical production process route of methyl methacrylate is the acetone cyanohydrin method, which is obtained by adding acetone and hydrogen cyanide to acetone cyanohydrin, and then undergoes amidation and methylation to obtain monomeric methyl methacrylate. [0003] Methacrylic acid amine is mainly used as silk weighting agent, fiber leveling agent, hygroscopic agent, adhesive and antistatic agent, and also used as cement additive, mortar additive, artificial leather additive, etc. At present, methacrylamide also adopts the acetone cyanohydrin method, that is, sulfuric acid and acetone cyanohydrin are put into the reactor for amidation reaction to generate m...

Claims

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Application Information

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IPC IPC(8): C07C233/09C07C231/12C07C69/54C07C67/20C01C1/24
Inventor 吴传隆丁永良郑道敏陈宏杨王贵王用贵
Owner CHONGQING UNISPLENDOUR CHEM
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