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Method for producing maleic anhydride through benzene process and absorbing maleic anhydride with solvent

A solvent absorption and maleic anhydride technology, which is applied in the field of maleic anhydride production by benzene method and solvent absorption, can solve the problems of high energy consumption, complicated process, and lower yield, and achieve high yield, advanced process flow, and energy saving Effect

Inactive Publication Date: 2013-04-17
WEIFANG YUANLI CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The production process of maleic anhydride in my country has long been dominated by the production process of benzene oxidation and water absorption. In the water absorption process, the maleic anhydride gas obtained by oxidizing benzene with desalted water is absorbed into maleic acid aqueous solution. In order to obtain maleic anhydride , water must be azeotropically absorbed and separated with dehydrating agent xylene, the process is complex, energy consumption is high, and maleic anhydride contacts water, generating a large amount of trans-structure fumaric acid, reducing the yield

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The maleic anhydride gas obtained by passing benzene and air through the oxidizer enters the solvent absorption tower from the bottom after heat exchange, and dibutyl phthalate enters the absorption tower from the top. The falling dibutyl phthalate and the rising The maleic anhydride gas is in countercurrent contact in the absorption tower, the dibutyl phthalate absorbs the maleic anhydride gas and cools it, and the dibutyl phthalate rich in maleic anhydride is extracted from the bottom of the solvent absorption tower, and the low The boiling tail gas is sent from the top of the solvent absorption tower into the high-temperature incinerator, operated under normal pressure, and the temperature inside the tower is controlled at 130°C;

[0034] After the dibutyl phthalate rich in maleic anhydride is extracted from the bottom of the solvent absorption tower, it enters the solvent desorption tower from the middle and upper part. Crude maleic anhydride, dibutyl phthalate c...

Embodiment 2

[0038] The maleic anhydride gas obtained by passing benzene and air through the oxidizer enters the absorption tower from the bottom after heat exchange, and dibutyl phthalate enters the absorption tower from the top. The falling dibutyl phthalate and the rising cis The anhydride gas is in countercurrent contact in the absorption tower, the dibutyl phthalate absorbs and cools the maleic anhydride gas, and the dibutyl phthalate rich in maleic anhydride is extracted from the bottom of the solvent absorption tower. Tail gas is sent from the top of the solvent absorption tower into the high-temperature incinerator, operated at normal pressure, and the temperature inside the tower is controlled at 135°C;

[0039] After the dibutyl phthalate rich in maleic anhydride is extracted from the bottom of the solvent absorption tower, it enters the solvent desorption tower from the middle and upper part. Crude maleic anhydride, dibutyl phthalate containing a small amount of maleic anh...

Embodiment 3

[0043] The maleic anhydride gas obtained by passing benzene and air through the oxidizer enters the solvent absorption tower from the bottom after heat exchange, and dibutyl phthalate enters the solvent absorption tower from the top, and the falling dibutyl phthalate and The rising maleic anhydride gas is in countercurrent contact in the absorption tower, dibutyl phthalate absorbs and cools the maleic anhydride gas, and extracts dibutyl phthalate rich in maleic anhydride from the bottom of the solvent absorption tower, after absorption The low-boiling tail gas is sent from the top of the solvent absorption tower into the high-temperature incinerator, operated at normal pressure, and the temperature inside the tower is controlled at 140°C;

[0044] After the dibutyl phthalate rich in maleic anhydride is extracted from the bottom of the solvent absorption tower, it enters the solvent desorption tower from the middle and upper part. Crude maleic anhydride, dibutyl phthalate...

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Abstract

The invention discloses a method for producing maleic anhydride through a benzene process. The method comprises the steps of: enabling a maleic anhydride gas and air mixture obtained by oxidizing benzene and air with an oxidizer to pass a solvent absorption tower and be absorbed by a solvent, separating the maleic anhydride from the solvent containing the maleic anhydride through a desorber, enabling the separated coarse maleic anhydride to enter a refining tower and be refined to prepare the maleic anhydride finished product, and regenerating the separated solvent for recycling. According to the method, a non-water recovery technology is adopted, lots of energy consumption for evaporation and dehydration is reduced, the generation of impurities such as fumaric acid is avoided, the recovery rate of the maleic anhydride is increased, the equipment investment is reduced, and the cost is saved.

Description

technical field [0001] The invention relates to a method for producing maleic anhydride, in particular to a method for producing maleic anhydride with a benzene method and absorbing it with a solvent. Background technique [0002] Maleic anhydride (MA), also known as maleic anhydride, is an important organic chemical raw material and the third largest anhydride after phthalic anhydride and acetic anhydride. It is mainly used in the production of unsaturated polyester and alkyd resin. In addition, it is also used in pesticides, coatings, inks, lubricating oil additives, paper chemicals, textile finishing agents, surfactants and other fields. [0003] At present, the production process routes of maleic anhydride can be divided into four types according to the raw materials: benzene oxidation method, n-butane oxidation method, C4 olefin method and phthalic anhydride by-product method. The production process of maleic anhydride in my country has long been dominated by the prod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D307/60
Inventor 杨辉张建梅许元元张平郑红军
Owner WEIFANG YUANLI CHEM
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