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Method for removing polyphenylene sulfide byproduct dry salt organic substance adopting self-propagating heat-storing incinerating device

An incineration device and polyphenylene sulfide technology, applied in the direction of combustion methods, raw material granulation methods, chemical instruments and methods, etc., can solve the problems of lithium salt purification affecting the quality of lithium salts, etc., to achieve reduced losses and uniform temperature distribution , the effect of small gradient

Inactive Publication Date: 2019-05-31
CHONGQING ANGRUIYUE SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The organic solvent extraction method is to use the difference in solubility of inorganic salts such as sodium chloride and lithium chloride in organic solvents to filter and remove inorganic salts such as sodium chloride, but organic substances such as oligomeric PPS, residual NMP and NMP derivatives are dissolved in the filtrate. , which will still lead to further purification of lithium salt or affect the quality of lithium salt

Method used

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  • Method for removing polyphenylene sulfide byproduct dry salt organic substance adopting self-propagating heat-storing incinerating device
  • Method for removing polyphenylene sulfide byproduct dry salt organic substance adopting self-propagating heat-storing incinerating device
  • Method for removing polyphenylene sulfide byproduct dry salt organic substance adopting self-propagating heat-storing incinerating device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A self-propagating thermal storage incineration device is used to remove the dry salt organic matter of the by-product of polyphenylene sulfide. The dry salt of the by-product of polyphenylene sulfide comes from a polyphenylene sulfide production enterprise. Before treatment, it mainly contains NMP, PPS short chain (oligomeric substances) and organic substances such as thiophenol.

[0024] First, the by-product dry salt is homogenized until the particle size is less than 3mm, and then pelletized with a binder (10% syrup solution). N, the number of drops ≥ 15.

[0025] Pellets and agricultural waste (straw) are formed into a mixed material, and the agricultural waste accounts for 5%. The above mixed material is pyrolyzed, wherein, the thickness of the pyrolyzed material layer is 350mm, and the pyrolysis temperature is 653°C. After a certain period of time, the material layer is cooled to obtain the finished salt, and the specific parameters of the finished salt after py...

Embodiment 2

[0030] The polyphenylene sulfide used in the above-mentioned test 1 is enlarged, and the method is as follows: figure 1 For the shown pyrolysis device, the processing capacity is increased to 1 ton, and the method is as shown in Example 1, pyrolyzing for 1.5 hours. After pyrolysis, the finished salt in different positions of the material layer is taken for inspection. The finished salt is brown in appearance and particle size Uniform, no melting and agglomeration, the particle size range of the finished salt is 3-10mm, the TOC is 216ppm, the lithium content is 2.29%, and the lithium loss rate is 0.4%.

[0031] see figure 1 , the self-propagating pyrolysis negative pressure heat storage device includes a chain-belt conveyor 1, and the chain-belt conveyor 1 is composed of a drive mechanism 11 (not marked), a sprocket 12 and a chain belt 13 matched with the sprocket 12; Above the head of the chain-belt conveyor 1 along the direction of travel of the chain belt 13, a distributor ...

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Abstract

The invention relates to the technical field of solid waste treatment, and particularly relates to a method for removing a polyphenylene sulfide byproduct dry salt organic substance adopting a self-propagating heat-storing incinerating device. The method comprises the following steps that (1) byproduct dry salt is homogenized into dry salt particles or into powder salt, and then the powder salt ispelletized to obtain dry salt pellets; and (2) the dry salt pellets or the dry salt particles are used as materials to be subjected to self-propagating pyrolysis treatment, the pyrolysis temperatureis 600-800 DEG C, the materials are subjected to pyrolysis to obtain finished salt, wherein self-propagating pyrolysis refers to the process that on the premise of not turning over the materials, pyrolysis is carried out through heat on the basis of self-propagating of the materials. According to the method, the materials are not turned over in the pyrolysis process of the byproduct dry salt, theheat is transferred through self-propagating of the materials to carry out pyrolysis, and then loss of the lithium salt in the pyrolysis process is reduced; and meanwhile, oligomers in the byproduct dry salt can be completely removed, so that the phenomenon that the finished salt melts and agglomerates is avoided, and subsequent lithium salt extraction is facilitated.

Description

technical field [0001] The invention relates to the technical field of solid waste treatment, in particular to a method for removing polyphenylene sulfide by-product dry salt organic matter by self-propagating pyrolysis. Background technique [0002] Polyphenylene sulfide (PPS) is a new high-performance thermoplastic resin with good heat resistance, corrosion resistance, flame retardancy, electrical insulation, mechanical strength and processing performance. It is known as the sixth largest engineering plastic and has been widely used Used in automobiles, electronics, aerospace, precision instruments and other fields. [0003] So far, sodium sulfide and p-dichlorobenzene are mainly used as raw materials at home and abroad, lithium chloride is a catalyst, N-methylpyrrolidone (NMP) is a solvent, and pressure and compression polymerization are used to prepare PPS. Sodium chloride and oligomeric by-products and the filtrate of NMP, and among them, NMP and lithium chloride are e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23G5/027F23G5/44F23G5/46F23J15/02B01J2/00
Inventor 李秉正李一吴汕甘奕张军
Owner CHONGQING ANGRUIYUE SCI & TECH
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