Purification recovering method for sodium thiocyanate solution of acrylic fiber production

A technology of sodium thiocyanate and recovery methods, applied in the direction of thiocyanate, etc., can solve the problems of high energy consumption and material consumption, waste water, large quantities, etc., and achieve the reduction of desalinated water consumption, reduction of evaporated and concentrated water, and reduction of sewage discharge Effect

Inactive Publication Date: 2008-05-21
JIANGDU COUNTY ENVIRONMNT PROTECTION EQUIPS FACTORY +1
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Problems solved by technology

[0004] The recovery rate of traditional sodium thiocyanate solution purification recovery method can only reach 90% usually, because the high energy consumption of evaporation concentration crystallization and chemical agent (diatomaceous earth, The consumption of sulfuric acid, sodium hydroxide) not only consumes high energy and material costs, but also produces a large amount of waste water and waste solids, and the quality of sodium thiocyanate solution will also be affected due to the occurrence of side reactions and impurities brought in with chemical agents

Method used

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  • Purification recovering method for sodium thiocyanate solution of acrylic fiber production

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Embodiment Construction

[0023] step one:

[0024] The high-heterothiocyanate-containing sodium thiocyanate solution B (control the sodium thiocyanate concentration to account for the solution weight percentage concentration of no more than 25%) produced by spinning and other production processes, after passing through the heat exchanger 9, the temperature is controlled at 20-40 ° C, the best The temperature is 25-35°C, and then it enters the buffer storage tank 1 to skim off the oily substances in the solution; after that, it is filtered through a bag filter 2 with a precision of 5-200 microns (preferably 10-50 microns) to intercept the solution The insoluble impurities in the solution will enter the first-level nanofiltration circulation tank 3 in one batch per 50 cubic meters of solution.

[0025] Step two:

[0026] After passing through a first-level nanofiltration device 4 circulating with the first-level nanofiltration circulation tank 3, filter out the qualified sodium thiocyanate solution of ...

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Abstract

A method for purifying and recovering sodium thiocyanate aqueous solution in acrylic production relates to a sewage treatment method, in particular to a method for purifying and recovering sodium thiocyanate aqueous solution in the acrylic production process. Including buffer storage, filtration, primary nanofiltration, secondary nanofiltration, evaporation and concentration process. After the purification and recovery of the present invention, the quality of sodium thiocyanate in the waste liquid accounts for no more than 5% of the total mass of sodium thiocyanate in the raw feed solution, and the recovery of sodium thiocyanate can reach more than 98%, and the production process does not need to add Chemical raw materials such as caustic soda, sulfuric acid, diatomaceous earth, etc., compared with the usual traditional purification and recovery methods, one evaporation and concentration process is reduced, the amount of desalted water is reduced by more than 80%, the amount of evaporation and concentration water is also greatly reduced, and the amount of sewage discharge is also greatly reduced.

Description

technical field [0001] The invention relates to a sewage treatment method, in particular to a method for purifying and recovering sodium thiocyanate aqueous solution in the acrylic production process. Background technique [0002] Most of the acrylic production process uses sodium thiocyanate solution as the polymerization solvent and silk-melting cooling solvent. In the production process, impurities such as sulfate ions, iron ions, β-SPN, β-SPA, etc. will enter the thiocyanate in sodium solution. Sodium thiocyanate solution is recycled in the acrylic production process, and the accumulation of impurities will cause many adverse effects. Therefore, there is a special solution purification and recycling production process to remove impurities. [0003] There are multiple methods for purifying sodium thiocyanate solution at present. Preliminary purification usually adopts sodium hydroxide precipitation method combined with diatomaceous earth filtration or ion exchange method...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C3/20
Inventor 李必文孙在柏张伟虞荣松袁义俞杰
Owner JIANGDU COUNTY ENVIRONMNT PROTECTION EQUIPS FACTORY
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