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Method and system for feeding acetone cyanohydrin during preparation of methyl methacrylate

A technology of methyl methacrylate and acetone cyanohydrin, which is applied in the field of feeding methods and systems in the preparation of methyl methacrylate, and can solve the problems of overheating of the droplet surface, increased consumption of acetone cyanohydrin, decomposition of acetone cyanohydrin, etc. problem, to achieve the effect of reducing the degree of decomposition, increasing the conversion rate and reducing consumption

Active Publication Date: 2017-04-26
中石油吉林化工工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But, in the preparation device that adopts at present, acetone cyanohydrin adopts the mode feeding of injection pipeline or directly injects amide reactor, causes the mixing of acetone cyanohydrin and sulfuric acid to be insufficient and rapid thus, has bigger acetone cyanohydrin droplet produce
This will not only cause overheating on the surface of the droplet, causing partial decomposition of acetone cyanohydrin, but also increase the consumption of acetone cyanohydrin and reduce the conversion rate of the acylation reaction
[0006] For the above-mentioned problems existing in related technologies, no effective solution has been proposed yet

Method used

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  • Method and system for feeding acetone cyanohydrin during preparation of methyl methacrylate
  • Method and system for feeding acetone cyanohydrin during preparation of methyl methacrylate
  • Method and system for feeding acetone cyanohydrin during preparation of methyl methacrylate

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Experimental program
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Effect test

Embodiment 1

[0035] Concentrated sulfuric acid is continuously added to the amide circulation loop through the sulfuric acid mixer M-2. After that, acetone cyanohydrin was injected into two streams at two locations by spraying. One of acetone cyanohydrin was continuously added to the amide circulation loop through the first acetone cyanohydrin mixer M-1 located at the first location. The acetone cyanohydrin is continuously injected into the amide circulation loop through the second acetone cyanohydrin injector J-1. The first acetone cyanohydrin mixer M-1 is arranged on the pipeline between the outlet of the amide cooler E1 and the inlet of the gas separator V1. The weight ratio of the acetone cyanohydrin passing through the first acetone cyanohydrin mixer M-1 and the acetone cyanohydrin injected through the second acetone cyanohydrin injector J-1 is 3:1. The molar ratio of the concentrated sulfuric acid injected into the amide circuit to the total amount of acetone cyanohydrin is 1.6:1. T...

Embodiment 2

[0038] Concentrated sulfuric acid is continuously added to the amide circulation loop through the sulfuric acid mixer M-2. After that, acetone cyanohydrin was injected into two streams at two locations by spraying. One acetone cyanohydrin was continuously added to the amide circulation loop through the first acetone cyanohydrin mixer M-1 located at the first location. The acetone cyanohydrin is continuously injected into the amide circulation loop through the second acetone cyanohydrin injector J-1. The first acetone cyanohydrin mixer M-1 is arranged on the pipeline between the outlet of the amide cooler and the inlet of the gas separator. The weight ratio of the acetone cyanohydrin passing through the first acetone cyanohydrin mixer M-1 and the acetone cyanohydrin injected through the second acetone cyanohydrin injector J-1 is 1:1. The molar ratio of the concentrated sulfuric acid injected into the amide circuit to the total amount of acetone cyanohydrin is 1.5:1. The operat...

Embodiment 3

[0041] Concentrated sulfuric acid is continuously added to the amide circulation loop through the sulfuric acid mixer M-2. After that, acetone cyanohydrin was injected into two streams at two locations by spraying. One acetone cyanohydrin was continuously added to the amide circulation loop through the first acetone cyanohydrin mixer M-1 located at the first location. The acetone cyanohydrin is continuously injected into the amide circulation loop through the second acetone cyanohydrin injector J-1. The first acetone cyanohydrin mixer M-1 is arranged on the pipeline between the outlet of the amide cooler E-1 and the inlet of the gas separator V1. The weight ratio of the acetone cyanohydrin passing through the first acetone cyanohydrin mixer M-1 and the acetone cyanohydrin injected through the second acetone cyanohydrin injector J1 is 2:1. The molar ratio of the concentrated sulfuric acid injected into the amide circuit to the total amount of acetone cyanohydrin is 1.5:1. The ...

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Abstract

The invention discloses a method for feeding acetone cyanohydrin during preparation of methyl methacrylate. The method comprises a step of jetting acetone cyanohydrin into an amide circulation loop, wherein the amide circulation loop is composed of an amide cooler, a gas separator and an amide circulation pump which is located between the outlet of the gas separator and the inlet of the amide cooler. According to the invention, through jetting of acetone cyanohydrin into the amide circulation loop at a plurality of positions, smaller acetone cyanohydrin drops are formed, so material mixing is more sufficient and faster, the decomposition degree of acetone cyanohydrin is reduced, the conversion rate of amide is increased, and unnecessary consumption of acetone cyanohydrin is lowered; thus, the conversion rate of an acylation reaction is increased.

Description

Technical field [0001] The invention relates to the field of chemical engineering, and in particular, to a feeding method and system in the preparation process of methyl methacrylate. Background technique [0002] Methyl methacrylate (abbreviated as MMA) is an important organic chemical raw material and chemical product, mainly used for the production of plexiglass (abbreviated as PMMA), polyvinyl chloride additives ACR, methyl methacrylate-styrene- Butadiene copolymer (abbreviated as MBS) and used as the second monomer for acrylic fiber production. It can also be used as resin, adhesive, coating, ion exchange resin, paper polish, textile printing and dyeing auxiliary, leather treatment agent , Lubricating oil additives, crude oil pour point depressant, wood and soft wood sizing agent, motor coil saturating agent, insulating pouring material and plasticizer for plastic emulsion, etc., which are very versatile. [0003] At present, the main MMA production technologies used in the w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C67/20C07C69/54
CPCC07C67/20C07C69/54
Inventor 李雪刘清娟潘秀亮刘学线李洪明孙秀利刘伟明
Owner 中石油吉林化工工程有限公司
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