Method for recycling colvent utilized in producting polyphenylene sulfide

The technology of a polyphenylene sulfide and a recovery method is applied in the recovery field of recovering a solvent used for the production of polyphenylene sulfide, and can solve the problems of affecting the solvent recovery efficiency, being difficult to recover the solvent, and easily blocking a rectifying tower, and achieving a simple and convenient extraction method. Improve the recovery rate and quality, the effect of high recovery rate

Inactive Publication Date: 2003-10-01
自贡鸿鹤化工股份有限公司
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Problems solved by technology

[0003] Thereby, above-mentioned background technology exists: 1, when rectifying, because the existence that contains oligomer and polymerization reaction auxiliary agent in the mixed liquid, it is easy to block the rectification tower, and the solvent in the res

Method used

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Examples

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Example Embodiment

[0016] Example

[0017] When using p-dichlorobenzene and sodium chloride as raw materials, alkali metal chlorides as additives (catalysts), and N-methyl-2-pyrrolidone (ie NMP) as solvents, the production of poly In the process of phenyl sulfide resin:

[0018] A. Take 300kg of the dehydrated liquid after dehydration of sodium sulfide, 470kg of the mixture filtrate after polycondensation reaction, and the previous circulating filter cake washing water as the extractant. The filter cake is extracted three times in the countercurrent gap until the NMP solvent content in the filter cake is less than 1% 500kg of the extracted liquid obtained afterwards; all input into the treatment tank to form a mixed liquid;

[0019] B. Add 50kg of industrial sodium carbonate with a purity of ≥98% to the mixture and heat the mixture to 50°C and stir evenly. Use LiCO as the auxiliary agent. 3 Precipitate in the form of, and separate some low-molecular substances at the same time, to obtain 1210 kg of ...

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Abstract

A process for recovering the solvent used in preparing polyphenyl thioether includes such steps as using the washing water of filter cake as extractant to extract the solvent from filter cake, mixingthe extract with the dewatered liquid and/or filtrate generated in production of polyphenyl thioether, adding treating agent to separate out assistant, and dual-tower rectifying to obtain refined NMPsolvent. Its advantages are high recovery rate increased by 10%, high content of NMP (99.6% or more), and low cost.

Description

technical field [0001] The invention belongs to a method for recovering a solvent used in polyphenylene sulfide production. Especially a kind of solvent N-methyl-2-pyrrolidone used in the production of polyphenylene sulfide, which is recovered from the mixed liquid containing the solvent produced at each stage of the production process of polyphenylene sulfide , in order to reuse the method. Background technique [0002] In the production of polyphenylene sulfide resin (abbreviated as PPS), dichlorobenzene and hydrous sodium sulfide are used as raw materials, alkali metal chlorides are used as catalysts, and N——methyl——2—pyrrolidone (referred to as NMP ) as a solvent, after dehydration by sodium sulfide, compression polymerization to obtain the target object. The NMP used in this production process is a very expensive solvent, in order to reduce production costs, it must be recycled. The mixed liquid containing NMP solvent produced during the production of polyphenylene s...

Claims

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Application Information

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IPC IPC(8): C08J11/02
Inventor 彭布尔陈玉珊曾理康石森昊芶粱吾
Owner 自贡鸿鹤化工股份有限公司
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