Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Feeding method and system of acetone cyanohydrin during the 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 process of methyl methacrylate, can solve the problem of overheating of the droplet surface, increased consumption of acetone cyanohydrin, decomposition of acetone cyanohydrin, etc. problems, to achieve the effect of reducing the degree of decomposition, improving the conversion rate and improving the efficiency

Active Publication Date: 2020-04-17
中石油吉林化工工程有限公司
View PDF6 Cites 0 Cited by
  • 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

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
  • Feeding method and system of acetone cyanohydrin during the preparation of methyl methacrylate
  • Feeding method and system of acetone cyanohydrin during the preparation of methyl methacrylate
  • Feeding method and system of acetone cyanohydrin during the preparation of methyl methacrylate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Concentrated sulfuric acid is continuously added to the amide recycle loop through sulfuric acid mixer M-2. Afterwards, inject acetone cyanohydrin into acetone cyanohydrin in spray mode in two streams at two positions, wherein one stream of acetone cyanohydrin is continuously added in the amide circulation loop by the first acetone cyanohydrin mixer M-1 at the first position, and the other Acetone cyanohydrin is continuously injected into the amide recycle loop through the second acetone cyanohydrin injector J-1. Wherein 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 passed 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 concentrated sulfuric acid injected into the amide loop to the total amount of acetone cyano...

Embodiment 2

[0038] Concentrated sulfuric acid is continuously added to the amide recycle loop via sulfuric acid mixer M-2. Afterwards, inject acetone cyanohydrin into acetone cyanohydrin in spray mode in two streams at two positions, wherein one stream of acetone cyanohydrin is continuously added in the amide circulation loop by the first acetone cyanohydrin mixer M-1 positioned at the first position, and the other Acetone cyanohydrin is continuously injected into the amide recycle loop through the second acetone cyanohydrin injector J-1. Wherein 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 passed 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 concentrated sulfuric acid injected into the amide loop to the total amount of acetone cyan...

Embodiment 3

[0041] Concentrated sulfuric acid is continuously added to the amide recycle loop via sulfuric acid mixer M-2. Afterwards, inject acetone cyanohydrin into acetone cyanohydrin in spray mode in two streams at two positions, wherein one stream of acetone cyanohydrin is continuously added in the amide circulation loop by the first acetone cyanohydrin mixer M-1 positioned at the first position, and the other Acetone cyanohydrin is continuously injected into the amide recycle loop through the second acetone cyanohydrin injector J-1. Wherein 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 passed 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 concentrated sulfuric acid injected into the amide loop to the total amount of aceton...

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 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 industry, and in particular, relates to a feeding method and system in the preparation process of methyl methacrylate. Background technique [0002] Methyl methacrylate (MMA for short) is an important organic chemical raw material and chemical product, mainly used in the production of plexiglass (PMMA for short), polyvinyl chloride additive ACR, methyl methacrylate-styrene- Butadiene copolymer (abbreviated as MBS) and used as the second monomer for the production of acrylic fibers can also be used as resins, adhesives, coatings, ion exchange resins, paper polishes, textile printing and dyeing auxiliaries, leather treatment agents , lubricating oil additives, crude oil pour point depressant, wood and soft wood sizing agent, motor coil impregnation agent, insulating potting material and plasticizer of plastic emulsion, etc., are widely used. [0003] At present, the main MMA production technologies used in ...

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): 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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com