A method for comprehensive recovery and utilization of by-product slurry in the production process of polyphenylene sulfide
A production process, technology of polyphenylene sulfide, applied in alkali metal halide purification, organic chemistry, lithium carbonate;/acid carbonate, etc., can solve the cumbersome recovery process, low product purity and yield and other problems to achieve the effect of reducing production costs and high purity
Active Publication Date: 2018-09-28
TIANJIN UNIV OF SCI & TECH +1
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It is worth noting that the current recycling method for PPS by-product slurry only recovers one or two components, and the recovery process is cumbersome, and the purity and yield of the obtained product are low
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[0029] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0030] by figure 1 The process scheme shown recycles the PPS by-product slurry. Lithium-containing dry waste salt was obtained after the slurry was distilled and dried under reduced pressure, and its composition was shown by XRD and quantitative analysis, NaCl, Li 2 CO 3 , organic matter were 84.6%, 7% and 6.8%, and other components accounted for 1.6%.
[0031] Under the condition that the liquid-solid ratio is 2.9, the dry waste salt is reacted and leached with HCl solution, the leaching time is 2 hours, and the final pH of the solution is controlled to be 3.2. Then use 5% NaOH solution to adjust the pH of the leaching solution to control the end point pH=6.8. The pH-adjusted solution is filtered to recover insoluble PPS oligomers, and 20-40 mesh activated carbon is used to adsorb and purify the filtered solution to remove dissolved organi...
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Disclosed is a method for comprehensive recycling of a by-product slurry during polyphenylene sulfide (PPS) production. Na2CO3 is added to the slurry, and then a solvent NMP is recovered by distillation and drying, then an acid solution is used for dissolving and leaching the resulting dry waste salt, the leaching liquor is subjected to pH adjustment and then filtered, with the insoluble components being removed, the liquid phase is subjected to adsorption and purification and evaporation concentration to separate out NaCl, then Na2CO3 is added to the solution with NaCl separated out for precipitation to obtain Li2CO3, the mother liquor with lithium precipitated is subjected to pH adjustment and then mixed with the solution obtained after adsorption and purification, and a closed circulation of the process is achieved. The method can be used in the comprehensive recycling of the by-product slurry during PPS production, the recovered NaCl can be directly used for caustic soda preparation by ionic membrane electrolysis, and Li2CO3 can directly serve as an industrial product or can be further converted into LiCl to serve as a PPS production auxiliary for recycling.
Description
technical field [0001] The invention relates to the production field of polyphenylene sulfide (PPS), in particular to an efficient comprehensive recycling method for by-product slurry in the industrial production of polyphenylene sulfide. Background technique [0002] Polyphenylene sulfide (PPS) is a thermoplastic special engineering plastic with excellent electrical insulation, flame retardancy, chemical corrosion resistance and other excellent properties. It is widely used in aerospace, electronic appliances, chemical industry and many other fields. using Na 2 S and p-dichlorobenzene are used as raw materials, N-methylpyrrolidone (NMP) is used as a solvent, and LiCl is used as an auxiliary agent. and other by-product slurry. Because LiCl and NMP are expensive, if the comprehensive recycling of the by-product slurry is not carried out, it will lead to a sharp increase in production costs and serious environmental pollution problems. [0003] At present, there have been r...
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IPC IPC(8): C08G75/0277C08G75/0281C08G75/0254C08G75/0213C01D15/08C01D3/14C07D207/267
CPCC01D3/14C01D15/08C07D207/267C08G75/0213C08G75/0254C08G75/0277C08G75/0281
Inventor 邓天龙余晓平李乾华吕天生胡洪铭郭亚飞王士强李珑陈尚敬谢晓鸿张思思
Owner TIANJIN UNIV OF SCI & TECH