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Method for treating cyanate ions in benzyl cyanide production wastewater

A technology for the production of wastewater and treatment methods, applied in the directions of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve problems such as unsatisfactory effects, complicated operations, and large investment, and achieve The effect of reduced CN-concentration, simple operation and low investment

Inactive Publication Date: 2011-06-29
聊城鲁西氯苄化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional treatment methods include adding acid to extract cyanide, biochemical method, electrolysis method, etc. These methods have large investment, complicated operation, high cost and unsatisfactory effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Adopt 5000L enamel kettle as reaction kettle, squeeze into cyanogen-containing waste water 5000L in the reaction kettle, add sodium hydroxide, regulate waste water pH value to 10, then add sodium hypochlorite solution (available chlorine 10%) by volume ratio 250: 1 ratio, Seal the mouth of the still, turn on the steam to raise the temperature to 140°C, keep it warm for 2 hours, then lower the temperature to 50°C, the waste water cyanide can be treated below 100PPM.

Embodiment 2

[0013] Adopt 5000L enamel kettle as reaction kettle, squeeze into cyanogen-containing waste water 5000L in the reaction kettle, add sodium hydroxide, regulate waste water pH value to 10, then add sodium hypochlorite solution (available chlorine 13%) by volume ratio 250: 1 ratio, Seal the mouth of the kettle, turn on the steam to raise the temperature to 150°C, keep it warm for 1 hour, then lower the temperature to 40°C, the waste water cyanide can be treated below 100PPM.

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PUM

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Abstract

The invention discloses a method for treating cyanate ions in benzyl cyanide production wastewater. The method comprises the following steps of: throwing cyanogen-containing wastewater into a reaction kettle; adding sodium hydroxide to adjust the pH value to 10; adding sodium hypochlorite solution; sealing an opening of the kettle; heating the reaction kettle to 140 to 150 DEG C; preserving the heat for 1 to 2 hours; cooling to 40 to 50 DEG C; and opening a pump and throwing the solution into a wastewater storage tank after the cyanogen is broken for recovering and reusing. By the method, cyanate ion (CN<->) concentration of the benzyl cyanide wastewater is greatly reduced; and requirements of wastewater standard emission are met through simple system treatment. The technique is small in investment, simple in operation, high in safety because of no hydrogen cyanide gas and low in treatment cost.

Description

Technical field: [0001] The invention relates to a treatment method for cyanide-containing wastewater. Background technique: [0002] During the production of phenylacetonitrile, a large amount of CN-containing - Wastewater cannot be discharged directly. Traditional treatment methods include adding acid to extract cyanide, biochemical methods, electrolysis, etc. These methods have large investment, complicated operation, high cost, and unsatisfactory effects. Invention content: [0003] The purpose of this invention is to provide a kind of treatment method of cyanate ion in the phenylacetonitrile production waste water, and this kind method is simple, and treatment effect is good. [0004] The technical scheme that the present invention takes is: [0005] The method for treating cyanate ions in phenylacetonitrile production wastewater is to pour cyanide-containing wastewater into the reaction kettle, add sodium hydroxide, adjust the pH value of the wastewater to 10, the...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F101/18
Inventor 吴宪清刘卫宁
Owner 聊城鲁西氯苄化工有限公司
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