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Solvent refining method in technology for recovering maleic anhydride from organic solvent

An organic solvent and solvent refining technology, applied in organic chemistry, separation methods, chemical instruments and methods, etc., can solve problems such as equipment blockage, accelerated solvent decomposition, and by-product accumulation, so as to save addition, avoid equipment blockage, and save production cost effect

Inactive Publication Date: 2015-05-20
TIANJIN BOHUA ZHONGHE CHEM
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  • Abstract
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Problems solved by technology

[0003] In order to solve the shortcomings of the organic solvent recycled in the existing maleic anhydride absorption process, after a period of use, the by-products accumulate, cause equipment blockage, and accelerate solvent decomposition, and provide a solvent refining method in the organic solvent recovery maleic anhydride process

Method used

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Embodiment 1

[0015] A solvent refining method in an organic solvent recovery process for maleic anhydride, comprising the following steps:

[0016] (1) Through the absorption of maleic anhydride by the organic solvent in the absorber, they enter the resolver together, and the maleic anhydride crude product is obtained after being desorbed by the desorber, and the remaining organic solvent enters the alkaline solvent scrubber;

[0017] (2) The alkaline solvent scrubber is filled with 0.05-0.5mol / L lye, the temperature of the lye is 30-50°C, and the flow rate of the organic solvent is 0.5-1kg / h;

[0018] (3) The organic solvent passing through the alkaline solvent scrubber enters the acidic scrubber, which contains 0.05-0.1mol / L acid solution, the temperature of the acid solution is 10-20°C, and the flow rate of the organic solvent is 0.5-1kg / h;

[0019] (4) The organic solvent passing through the acid solvent scrubber enters the water scrubber, the flow rate of the organic solvent is 0.5~...

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Abstract

The invention discloses a solvent refining method in a technology for recovering maleic anhydride from an organic solvent. The method comprises the following steps: (1) desorbing to obtain maleic anhydride through a desorber and then feeding the residual organic solvent into an alkaline solvent washer; (2) controlling the concentration of alkaline liquor to be 0.05-0.5mol / L and the temperature to be 30-50 DEG C; (3) feeding the organic solvent which is processed in the alkaline solvent washer into an acid solvent washer, wherein the concentration of acid liquid is 0.05-0.1mol / L and the temperature is 10-20 DEG C; (4) feeding the organic solvent which is processed through the acid solvent washer to a water washer, wherein the water washing temperature is a room temperature; and (5) processing the organic solvent which is processed through the water washer in a drying tower, and then feeding to an absorber for recycling. The solvent refining method in the technology for recovering the maleic anhydride from the organic solvent is simple, convenient and practical; most of by-products can be effectively removed; equipment is prevented from being blocked; the service life of the equipment is prolonged; meanwhile, addition of a novel solvent can be reduced; and the production cost is reduced.

Description

technical field [0001] The invention relates to the field of production process optimization of maleic anhydride, and specifically designs a solvent refining method in the process of recovering maleic anhydride from an organic solvent. Background technique [0002] Maleic anhydride, also known as maleic anhydride and maleic anhydride, is an important organic chemical raw material. Its unique chemical structure determines its active chemical properties. It can send substitution, addition, esterification, polymerization, etc. reaction, so it has been increasingly widely used in many fields. According to raw materials, maleic anhydride production can be divided into phthalic anhydride by-product method, benzene method, carbon tetraolefin and n-butane method, among which benzene method and n-butane method are more common, and the production process is divided into three parts: catalytic oxidation, gas phase absorption and refining and purification. Among them, gas phase recover...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D307/60B01D53/14
CPCC07D307/60B01D53/1425B01D2252/20
Inventor 王健
Owner TIANJIN BOHUA ZHONGHE CHEM
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