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Method for producing maleic anhydride by using o-xylene as dehydrating agent

A technology of o-xylene and dehydrating agent, applied in the field of maleic anhydride products, can solve the problems of slow dehydration speed and low purity of maleic anhydride, achieve fast dehydration speed and improve production efficiency

Active Publication Date: 2010-07-14
江苏中超新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The key to the dehydration effect is the content of o-xylene, so there are problems such as slow dehydration speed, high temperature requirements for azeotropic rectification kettle, and low purity of maleic anhydride after dehydration

Method used

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  • Method for producing maleic anhydride by using o-xylene as dehydrating agent
  • Method for producing maleic anhydride by using o-xylene as dehydrating agent
  • Method for producing maleic anhydride by using o-xylene as dehydrating agent

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Embodiment 1

[0015] Depend on figure 1 Know, the method that uses ortho-xylene of the present invention produces maleic anhydride as dehydrating agent, comprises the following steps: 1, adds ortho-xylene: 2, throws concentrated maleic acid water: 3, dehydration: 4, separates.

[0016] Depend on figure 2 It is the process flow diagram of the production of maleic anhydride of the present invention. Its technological process is:

[0017] 1. Add o-xylene: from the o-xylene storage tank through the o-xylene delivery pump, put 30000±5Kg of o-xylene with a purity of more than 99.9% as a dehydrating agent into the azeotropic rectification kettle equipped with a heating coil, and use a The heating coil reboiler is used for heating. The heat source of the heating coil is 1.1Mpa steam, so that the o-xylene is fully refluxed in the tower, and the temperature of the azeotropic distillation kettle reaches 145±0.5°C;

[0018] 2. Thick acid water injection: open the valve of the azeotropic rectificati...

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Abstract

The invention discloses a method for producing maleic anhydride by using o-xylene as a dehydrating agent, which is characterized by comprising the following steps: 1) adding or-xylene, 2) feeding aqueous concentrated maleic acid, 3) dehydrating and 4) separating. The purity of an o-xylene product after dehydrating and separating reaches 99.9 percent; compared with the method using mixed xylene asthe dehydrating agent, the method of the invention has the advantages that: the temperature of the tower top is controlled to be 4 DEG C lower, the temperature of the middle tower is controlled to be2 DEG C lower, the using amount of steam is saved by nearly 1 ton per hour, and the dehydrating speed is low; the amount of acid added into the tower of which the diameter is phi2,400 can reach 7.2M<3> / h; and the production efficiency is greatly improved.

Description

technical field [0001] The invention belongs to the improvement of chemical and physical method purification process for chemical products, and specifically relates to a crude product of maleic anhydride containing water molecules and free water—concentrated maleic acid water, using xylene as a dehydrating agent, through constant Boiling dehydration removes molecular water and free water in concentrated maleic acid water to obtain maleic anhydride product. Background technique [0002] Maleic anhydride (referred to as maleic anhydride or maleic anhydride, English abbreviation MA) is an important basic organic chemical raw material and the third largest anhydride in the world after phthalic anhydride and acetic anhydride. The main uses are: the plastics industry is used to make plasticizers; the paper industry is used to make paper treatment agents; the synthetic resin industry is used to make unsaturated polyester resins, alkyd resins, etc.; the paint industry is used to mak...

Claims

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Application Information

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IPC IPC(8): C07D307/60
Inventor 殷云武薛保安杨勇
Owner 江苏中超新材料科技有限公司
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