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A kind of method and device for continuous synthesis of tetrahydrophthalic anhydride

A technology of tetrahydrophthalic anhydride and maleic anhydride, applied in chemical instruments and methods, organic chemistry, chemical/physical/physical chemical processes, etc., can solve the problems of poor product quality, long reaction time, low conversion rate and the like, Achieve the effect of low production cost, high product quality and reduced equipment cost

Active Publication Date: 2022-07-01
河北龙亿环境工程有限公司
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  • 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

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  • A kind of method and device for continuous synthesis of tetrahydrophthalic anhydride
  • A kind of method and device for continuous synthesis of tetrahydrophthalic anhydride
  • A kind of method and device for continuous synthesis of 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 via the butadiene transfer pump 28; the maleic anhydride in the maleic anhydride material tank 1 enters via the transfer 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 0.1-1 MPa;

[0045] After completion of the reaction, the reaction product enters the flashing still 24, removes excess butadiene and solvent, the pressure is 5-100kpa, and the product tetrahydrophthalic anhydride enters the product storage tank; the butadiene removed enters the jet mixer 22 in gas phase form (Second-stage absorption reactor), maleic anhydride enters the jet mixer 22 through the circulating pump 23 to react with butadiene to absorb butadiene, and the reaction temperature is 60-150 ° C; maleic anhydride absorbs butadiene The m...

Embodiment 2

[0048] The technological process conditions are the same as those in Example 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 set in sequence from the outside to the inside, wherein the inner tube 3 has Karman vortex street generating parts 4 arranged at intervals along its length direction, and the mixing tube 18 passes through the outer tube 3. The tube 19 is communicated with the reaction tube 9; and the position where the mixing tube 18 is connected with the reaction tube 9 is located between the two Karman vortex street generation parts 4, and is close to the previous Karman vortex street generation part 4; the 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 maleic a...

Embodiment 3

[0052] The technological process conditions and other structures are the same as those 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 formed with tubular microporous parts 20 communicating with the inner space of the reaction tube 9 at intervals along its length direction, and each tubular microporous part 20 is located at two Karman vortices Between the street generation parts 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 the butadiene enters the reaction through the tubular microporous part 20 The inside of the tube 9 is mixed with maleic anhydride forming the Karman vortex 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 ...

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Abstract

The invention discloses a method and a device for continuously synthesizing tetrahydrophthalic anhydride, and belongs to the technical field of organic synthesis. The first stage adopts a tubular microemulsion reactor to react maleic anhydride and butadiene, and the reaction temperature and pressure are controlled to ensure the conversion rate of maleic anhydride; the reaction product enters the flash tank to remove excess butadiene and Butadiene enters the second-stage absorption reactor in the form of gas phase, and absorbs butadiene by chemical reaction with excess maleic anhydride solution, and the reaction liquid enters the first-stage reactor to continue to react with butadiene. The method of the invention has stable product quality, high utilization rate, high device automation, low production cost, high product quality, reduced equipment requirements, reduced equipment cost, advanced technology and extremely competitive process.

Description

technical field [0001] The invention relates to a synthesis method of tetrahydrophthalic anhydride, and belongs to the technical field of organic synthesis. Background technique [0002] As a maleic anhydride derivative, tetrahydrophthalic anhydride is widely used in resin curing agent, electronics, polyester high-grade coatings, green plasticizers, medicines and pesticides and other fields. The cured product formed by tetrahydrophthalic anhydride derivative 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 prepared by Dlels-Alder in 1928, using maleic anhydride and butadiene polycondensation, the synthesis reaction ...

Claims

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Application Information

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Patent Type & Authority Patents(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
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