Energy-saving device for separating maleic anhydride based on multi-stage condensation and two-stage absorption integration and process thereof

A secondary absorption and maleic anhydride technology, applied in the chemical industry, sustainable manufacturing/processing, organic chemistry, etc., can solve the problem of high energy consumption and achieve high maleic anhydride yield, good effect, and significant economic benefits

Active Publication Date: 2020-12-04
CHINA CONSTR IND & ENERGY ENG GRP CO LTD
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  • Abstract
  • Description
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Problems solved by technology

[0008] Aiming at the problem of high energy consumption in the traditional solvent absorption and purification process of maleic anhydride, the present invention provides an energy-saving device and process based on multi-stage condensation, two-stage absorption and integrated separation of maleic anhydride, which can effectively improve the purity and yield of maleic anhydride , to ensure low equipment investment, stable operation effect, remarkable effect of energy saving and consumption reduction

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  • Energy-saving device for separating maleic anhydride based on multi-stage condensation and two-stage absorption integration and process thereof

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Effect test

Embodiment 1

[0065] An energy-saving process based on multi-stage condensation and two-stage absorption integrated separation of maleic anhydride, comprising the following steps:

[0066] S1, 232251kg / h of air and 8244kg / h of benzene mixed to form the reaction raw material mixed gas 1 enters the maleic anhydride reactor R1 from the reaction raw material inlet, and generates a reaction product mixture with a maleic anhydride content of 3.2% through catalytic oxidation reaction Gas 2; the reaction product mixture gas 2 is cooled to 265°C by the reaction gas primary cooler E1, and enters the reaction gas secondary cooler E2 to continue cooling to 130°C;

[0067] S2. Maleic anhydride reaction gas with 240495kg / h maleic anhydride content of 3.2% is extracted from the outlet of reaction gas secondary cooler E2 and is divided into two streams of materials 4 and 5, which enter the absorption at the flow rates of 151512kg / h and 88983kg / h respectively The 25th tray of tower T1 and the reaction gas t...

Embodiment 2

[0081] An energy-saving process based on multi-stage condensation and two-stage absorption integrated separation of maleic anhydride, comprising the following steps:

[0082] S1, the reaction raw material mixed gas 1 formed by mixing 78144 kg / h of air and 2987 g / h of n-butane enters the maleic anhydride reactor R1 from the reaction raw material inlet, and generates a maleic anhydride content of 3.26% through catalytic oxidation reaction The reaction product mixture gas 2; the reaction product mixture gas 2 is cooled to 278°C by the reaction gas primary cooler E1, and enters the reaction gas secondary cooler E2 to continue cooling to 140°C;

[0083] S2. Maleic anhydride reaction gas with 3.2% maleic anhydride content of 81131kg / h is extracted from the outlet of reaction gas secondary cooler E2 and is divided into two streams of materials 4 and 5, which enter into the absorption at flow rates of 43000kg / h and 38131kg / h respectively The 25th tray of tower T1 and the reaction gas ...

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Abstract

The invention provides an energy-saving device for integrated separation of maleic anhydride based on multistage condensation and secondary absorption. The device comprises a maleic anhydride reactor,a crude maleic anhydride separator, an absorption tower, a desorption tower, a rear flash tower and a plurality of heat exchangers. The invention also discloses an energy-saving process for integrated separation of maleic anhydride based on multistage condensation and secondary absorption. An existing maleic anhydride recovery device is modified, so that maleic anhydride in reaction gas is partially condensed and separated firstly, the use amount of an absorbent, the load of a maleic anhydride post-treatment section device and the energy consumption of a reboiler are reduced, the economic benefit is remarkable, and popularization and application in the field of maleic anhydride recovery are facilitated.

Description

technical field [0001] The invention relates to a device for recovering maleic anhydride, in particular to an energy-saving device and process for separating maleic anhydride based on multistage condensation and secondary absorption integration. Background technique [0002] Maleic anhydride is a commonly used important organic chemical raw material, its consumption is second only to phthalic anhydride and acetic anhydride. It is mainly used in the production of unsaturated polyester resin, BDO, paint, etc. In recent years, the demand for maleic anhydride has been strong, the market prospect is good, the price of downstream products BDO has been rising, and the import volume has remained at a relatively high scale. [0003] The maleic anhydride production process can be generally divided into two parts: oxidation process and post-treatment process. The oxidation process can be divided into benzene method and n-butane method according to the raw materials. The post-treatment ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D307/60
CPCC07D307/60Y02P20/10
Inventor 孙玉玉岳昌海黄益平吴丹朱忆宁
Owner CHINA CONSTR IND & ENERGY ENG GRP CO LTD
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