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Production method of durene

A technology of durene and xylene, applied in the field of durene production, which can solve the problems of uneven quality of coal tar, dependence on imports, and limited raw materials, and achieve stable product quality, low consumption of raw and auxiliary materials, and improved purity Effect

Inactive Publication Date: 2019-07-05
JIANGSU ZHENGDAN CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the shortage of petroleum resources, domestic crude oil mostly relies on imports; coupled with factors such as unevenness and unstable quality of coal tar in the downstream of coal chemical industry, the raw materials for the preparation of durene are limited

Method used

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  • Production method of durene

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] figure 2 The part on the left shows the technical process of raw material gasification: xylene and alkylating agent pass through the first heat exchanger 11 below the radial fixed bed reactor 10, and absorb the heat generated by the reaction in the radial fixed bed reactor 10. The heat is then sent to the second heat exchanger 12, and the steam from the heating furnace 13 is sent to the second heat exchanger 12 at the same time, so that the xylene and the alkylating agent are heat-exchanged with the steam to obtain gasified xylene and alkylating agents.

[0069] Such as figure 2 As shown, the raw material xylene (volume space velocity is 0.2h -1 ) and methanol are gasified by heat exchange with steam, and the gasified raw materials are sent into the radial fixed bed reactor through the inlet pipe at the top of the radial fixed bed reactor. 0.9m 3 ZSM-5 molecular sieve catalyst, alkylation reaction at 0.1Mpa, 320°C. The alkylation liquid obtained by the alkylation...

Embodiment 2

[0072] The raw material xylene (volume space velocity is 0.65h -1 ) and methanol are gasified by heat exchange with steam, and the gasified raw materials are sent into the radial fixed bed reactor through the inlet pipe at the top of the radial fixed bed reactor. 1.1m 3 ZSM-5 molecular sieve catalyst, alkylation reaction at 0.45MPa, 350°C. The alkylation liquid obtained by the alkylation reaction is discharged from the outlet pipe at the bottom of the radial fixed bed reactor, and is sent to the rectification tower T1 after being heat-exchanged in the first heat exchanger (the operating pressure at the top of the tower is 110KPa, the operating temperature at the top of the tower is 90°C, and the operating temperature at the bottom of the tower is 110°C); the material produced at the top of the rectifying tower T1 is sent to the cooler, and the material passing through the cooler is condensed by a pump The uncondensed gas obtained at the end is pumped out and sent back to the...

Embodiment 3

[0075] The raw material xylene (volume space velocity is 1.2h -1) and methanol are gasified by heat exchange with steam, and the gasified raw materials are sent into the radial fixed bed reactor through the inlet pipe at the top of the radial fixed bed reactor. 1.5m 3 HZSM-5 molecular sieve catalyst, carry out alkylation reaction at 0.8MPa, 380°C. The alkylation liquid obtained by the alkylation reaction is discharged from the outlet pipe at the bottom of the radial fixed bed reactor, and is sent to the rectification tower T1 after being heat-exchanged in the first heat exchanger (the operating pressure at the top of the tower is 115KPa, the operating temperature at the top of the tower is 95°C, and the operating temperature at the bottom of the tower is 115°C); the material produced at the top of the rectifying tower T1 is sent to the cooler, and the condensed material passing through the cooler is pumped The uncondensed gas obtained at the end is pumped out and sent back t...

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Abstract

The invention discloses a production method of durene. The method includes: gasification and mixing of xylene and an alkylating agent, alkylation reaction, refining, freezing crystallization filtration and squeezing. The production method of durene provided by the invention has the advantages of: high catalyst activity and long service life, high product selectivity, high production safety, few alkylation by-product, stable finished product quality, low consumption of raw and auxiliary materials, and long service life of equipment, and is suitable for large-scale industrial production.

Description

technical field [0001] The present application relates to but not limited to the field of organic chemical industry, and particularly relates to but not limited to a method for producing durene. Background technique [0002] Durene is an important fine chemical raw material. After oxidation of durene, pyromellitic dianhydride can be obtained. Polymerization of pyromellitic dianhydride and diamine compounds can produce polyimide engineering with high temperature resistance and good insulation performance. Plastics, polyimide engineering plastics are important materials for high-tech industries such as microelectronics, aerospace and military industries. Durene can also be used as high temperature resistant plasticizer, intermediate of medicine and dye, etc. There are also high-grade aromatic hydrocarbon solvents that are by-products widely used in pesticides, light industry, machinery and other industries, and are important raw materials for industries such as pesticides, me...

Claims

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Application Information

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IPC IPC(8): C07C15/02C07C2/86C07C7/00
CPCC07C2/864C07C2/865C07C7/005
Inventor 曹正国李江华王福张小平
Owner JIANGSU ZHENGDAN CHEM IND CO LTD
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