Recovering method of by-product sodium chloride in polyphenylene sulfide production

A polyphenylene sulfide and recovery method technology, applied in the direction of alkali metal chlorides, etc., can solve problems such as adverse environmental effects and restrictions on the industrialization of polyphenylene sulfide, and achieve the goals of reducing energy consumption, avoiding adverse effects, and not wasting resources Effect

Active Publication Date: 2014-07-30
江苏新任环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The disadvantages of the above-mentioned by-product sodium chloride treatment method are: it restricts the industrialized development of polyphenylene sulfide, and causes great adverse effects on the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Embodiment 1, the recovery method of by-product sodium chloride in the production of polyphenylene sulfide, comprises the following steps: (1) adsorption and impurity removal, sodium chloride aqueous solution is squeezed into a 30m 3 The collection tank was stirred and mixed, the temperature was controlled at 55°C, 0.6% of the weight of sodium chloride was added to the activated carbon, mixed and stirred evenly, and the adsorption was carried out for 30 minutes; the weight of sodium chloride could be obtained by an online analysis instrument. (2) solid-liquid separation, filter the mixed solution in step (1) through a filter, separate activated carbon and sodium chloride aqueous solution, and the separated activated carbon is reused through regeneration; (3) concentrate and crystallize, inject the sodium chloride aqueous solution separated in step (2) Efficient distillation system concentrates, after the sodium chloride is precipitated, when the solid content of sodium c...

Embodiment 2

[0012] Embodiment two, the recovery method of by-product sodium chloride in the production of polyphenylene sulfide, comprises the following steps: (1) adsorption and impurity removal, sodium chloride aqueous solution is squeezed into a 30m 3 The collection tank was stirred and mixed, the temperature was controlled at 60°C, 0.8% of the weight of sodium chloride was added into the activated carbon, mixed and stirred evenly, and the adsorption was carried out for 25 minutes; the weight of sodium chloride could be obtained by an online analysis instrument. (2) solid-liquid separation, filter the mixed solution in step (1) through a filter, separate activated carbon and sodium chloride aqueous solution, and the separated activated carbon is reused through regeneration; (3) concentrate and crystallize, inject the sodium chloride aqueous solution separated in step (2) Efficient distillation system concentrates, after the sodium chloride is precipitated, when the solid content of sodi...

Embodiment 3

[0013] Embodiment three, the recovery method of by-product sodium chloride in the production of polyphenylene sulfide comprises the following steps: (1) adsorption and impurity removal, sodium chloride aqueous solution is squeezed into a 30m 3 The collection tank was stirred and mixed, the temperature was controlled at 65°C, 1.0% of the weight of sodium chloride was added with activated carbon, mixed and stirred evenly, and the adsorption was carried out for 35 minutes; the weight of sodium chloride could be obtained by an online analysis instrument. (2) solid-liquid separation, filter the mixed solution in step (1) through a filter, separate activated carbon and sodium chloride aqueous solution, and the separated activated carbon is reused through regeneration; (3) concentrate and crystallize, inject the sodium chloride aqueous solution separated in step (2) Efficient distillation system concentrates, after the sodium chloride is precipitated, when the solid content of sodium ...

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Abstract

The invention discloses a recovering method of a by-product sodium chloride in polyphenylene sulfide production. The method comprises the steps that: (1) impurities are removed by absorption, wherein a water solution containing sodium chloride is added into a collection tank and is stirred and mixed, a temperature is controlled at 55-65 DEG C, active carbon is added, the mixture is well mixed by stirring, and absorption is carried out for 25-35min; (2) solid-liquid separation is carried out, wherein the mixed liquid obtained in the step (1) is filtered, and active carbon and sodium chloride aqueous solution are obtained by separation; and (3) concentration and crystallization are carried out, wherein the sodium chloride aqueous solution obtained in the step (2) is injected into a multi-effect distillation system for concentration, solid-liquid separation is carried out after sodium chloride is precipitated, and sodium chloride crystals are obtained. In the above method, the active carbon used for absorption can be recovered and repeatedly used, such that resource is not wasted. Multi-effect distillation is adopted, such that energy consumption can be greatly reduced. The appearance and content of the recovered sodium chloride satisfy industrial sodium chloride standards, and provide a certain economic benefits. Further, adverse influences of sodium chloride to the environment can be avoided.

Description

technical field [0001] The present invention relates to the production field of polyphenylene sulfide (abbreviated as PPS), in particular to a method for recovering sodium chloride, a by-product in the industrial production of polyphenylene sulfide. Background technique [0002] The by-product sodium chloride is produced in the industrial production of polyphenylene sulfide. At present, there are few domestic studies on how to treat and separate the by-product sodium chloride. Generally, the by-product sodium chloride is treated as waste. [0003] The above-mentioned by-product sodium chloride treatment method has the following disadvantages: it restricts the industrial development of polyphenylene sulfide, and causes great adverse effects on the environment. Contents of the invention [0004] The purpose of the present invention is to provide a recovery method of by-product sodium chloride in the production of polyphenylene sulfide capable of effectively separating out so...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D3/04
Inventor 马建中唐峰夏海峰
Owner 江苏新任环保科技有限公司
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