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

Method and device for continuously synthesizing tetrahydrophthalic anhydride

A technology for the generation of tetrahydrophthalic anhydride, applied in chemical instruments and methods, chemical/physical/physical chemical fixed reactors, chemical/physical/physical chemical processes, etc., can solve low conversion rate, poor product quality, reaction Long time and other issues

Active Publication Date: 2021-04-23
河北龙亿环境工程有限公司
View PDF7 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the conversion rate of the reaction is low, the reaction time is long, the side reactions are many, and the product quality is poor.

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
  • Method and device for continuously synthesizing tetrahydrophthalic anhydride
  • Method and device for continuously synthesizing tetrahydrophthalic anhydride
  • Method and device for continuously synthesizing tetrahydrophthalic anhydride

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The butadiene in the butadiene material tank 29 enters the first-stage tubular microemulsion reactor 26 through the butadiene delivery pump 28; the maleic anhydride in the maleic anhydride material tank 1 enters through the delivery pump 27 In the first-stage tubular microemulsion reactor 26, butadiene and maleic anhydride react in the first-stage tubular microemulsion reactor 26; the reaction temperature is 60-150°C, and the pressure is 0.1-1MPa;

[0045] After the reaction is completed, the reaction product enters the flash tank 24 to remove excess butadiene and solvent, the pressure is 5-100kpa, and the product tetrahydrophthalic anhydride enters the product storage tank; the removed butadiene enters the jet mixer 22 in gas phase (Second-stage absorption reactor), maleic anhydride enters the jet mixer 22 through the circulation pump 23 to react with butadiene to absorb butadiene, and the reaction temperature is 60-150°C; maleic anhydride absorbs butadiene The mixed s...

Embodiment 2

[0048] Process flow condition is the same as embodiment 1.

[0049] The first-stage tubular microemulsion reactor such as figure 2 As shown, it includes an outer tube 19, a reaction tube 9 and an inner tube 3 that are sequentially set from the outside to the inside, wherein the inner tube 3 has Karman vortex generation parts 4 that are arranged at intervals along its length direction, and the mixing tube 18 passes through the outer tube. Pipe 19 is also communicated with reaction tube 9; and the position that mixing tube 18 is connected with reaction tube 9 is positioned between two Karman vortex street generating parts 4, and near the former Karman vortex street generating part 4 places; Material maleic anhydride Flowing through the space between the reaction tube 9 and the inner tube 3, the material butadiene enters the space between the reaction tube 9 and the inner tube 3 through the mixing tube 18, and mixes and reacts with the maleic anhydride. The working principle an...

Embodiment 3

[0052] Process conditions and other structures are the same as in Example 2.

[0053] This embodiment discloses another tubular microemulsion reactor, such as image 3 As shown, the reaction tube 9 is a microporous membrane tube, and the microporous membrane tube is configured with tubular micropores 20 communicated with the internal space of the reaction tube 9 at intervals along its length direction. Between the street generation part 4, maleic anhydride flows between the reaction tube 9 and the inner tube 3, butadiene flows between the outer tube 19 and the reaction tube 9, and butadiene enters the reaction tube through the tubular micropore part 20. The inside of the tube 9 is mixed with maleic anhydride which forms the Karman vortex street phenomenon, the heat exchange medium A flows through the inside of the inner tube 3 , and the heat exchange medium B flows through the outside of the outer tube 19 . The advantage of this embodiment is that: the tubular microporous par...

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 and device for continuously synthesizing tetrahydrophthalic anhydride, and belongs to the technical field of organic synthesis. In a first stage, a tubular micro-emulsion reactor is adopted, maleic anhydride and butadiene react, the reaction temperature and pressure are controlled, and the conversion rate of maleic anhydride is ensured; and a reaction product enters a flash evaporation kettle, excessive butadiene is removed, the removed butadiene enters a second-stage absorption reactor in a gas-phase form, the butadiene is absorbed by chemical reaction of excessive maleic anhydride solution, and the reaction liquid enters a first-stage reactor to continuously react with the butadiene. The method is stable in product quality, high in utilization rate, high in device automation degree, low in production cost and high in product quality, equipment requirements are reduced, equipment cost is reduced, the technology is advanced, and the process is extremely competitive.

Description

technical field [0001] The invention relates to a synthesis method of tetrahydrophthalic anhydride, belonging to the technical field of organic synthesis. Background technique [0002] Tetrahydrophthalic anhydride, as a derivative of maleic anhydride, is widely used in resin curing agents, electronics, high-end polyester coatings, green plasticizers, pharmaceuticals and pesticides and other fields. The cured product formed by tetrahydrophthalic anhydride derivatives and epoxy resin is an ideal packaging material, which is widely used in the packaging of basic electronic components such as resistors, capacitors, inductors, diodes, and triodes to complex devices such as semiconductor devices and integrated circuits. As an important chemical intermediate, the domestic demand for this product has been increasing in recent years. [0003] Tetrahydrophthalic anhydride was first produced by Dlels-Alder in 1928 by polycondensation of maleic anhydride and butadiene. The synthesis re...

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 Applications(China)
IPC IPC(8): C07D307/89B01J19/24B01J19/00
CPCC07D307/89B01J19/0053B01J19/2415B01J19/0093B01J2219/00081
Inventor 程曜峰周永林周旭康周玉
Owner 河北龙亿环境工程有限公司
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