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Treating and recycling method of sodium hypochlorite-containing waste liquid

A technology of sodium hypochlorite and waste liquid, which is applied in water/sewage treatment, chemical instruments and methods, oxidized water/sewage treatment, etc. Effectiveness of utilization, cost saving in wastewater treatment, easy operation

Inactive Publication Date: 2017-04-26
SHANGHAI CHLOR ALKALI CHEM
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method not only increases the amount and cost of wastewater treatment in the enterprise, but also the sodium chloride and sodium carbonate in the waste liquid cannot be effectively utilized.

Method used

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  • Treating and recycling method of sodium hypochlorite-containing waste liquid
  • Treating and recycling method of sodium hypochlorite-containing waste liquid
  • Treating and recycling method of sodium hypochlorite-containing waste liquid

Examples

Experimental program
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Embodiment 1

[0026] (1) The sodium hypochlorite waste liquid (concrete composition and content see Table 1) that hydrogen chloride catalytic oxidation system chlorine plant produces is sent into absorption tower from the top with the flow rate of 1000kg / h, simultaneously with the hydrogen peroxide solution of mass percent 8% Send it into the absorption tower from the top at a flow rate of 114.3kg / h;

[0027] The waste liquid containing sodium hypochlorite and hydrogen peroxide are in the absorption tower. After rapid reaction, they flow into the bottom of the absorption tower. Excessive hydrogen peroxide is completely decomposed, and the treatment liquid is obtained from the absorption tower kettle, and the components and contents are shown in Table 1;

[0028] (2) 1408kg of treatment liquid is delivered to the post-reactor of the primary brine section with a pump, and reacts with 150000kg of crude brine (see Table 2 for specific components and content) to generate calcium carbonate precip...

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Abstract

The invention discloses a treating and recycling method of sodium hypochlorite-containing waste liquid. The method comprises the following steps: (1) simultaneously conveying the sodium hypochlorite-containing waste liquid and a hydrogen peroxide solution from the top into an absorption tower to obtain treating liquid; (2) conveying the treating liquid to a rear reactor at a primary brine workshop section, carrying out reaction with crude brine to generate calcium carbonate precipitates, and enabling the liquid to flow into a middle tank; (3) adding sodium sulfite into the middle tank, carrying out stirring and filtering, and collecting pre-treated brine; and (4) adding hydrochloric acid into the pre-treated brine, and adjusting the PH to 9 to 11 to obtain primary fine brine. According to the treating and recycling method, the hydrogen peroxide solution is used for treating the sodium hypochlorite-containing waste liquid produced by a device for preparing chloride by catalytic oxidization of hydrogen chloride, and the treating liquid is recycled as a raw material for a saline solution desalting workshop section for electrolysis, so that recycling of resources is realized, and the environment is protected. Effective treatment and recycling of the sodium hypochlorite-containing waste liquid are realized.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a treatment and reuse method for waste liquid containing sodium hypochlorite. Background technique [0002] Chlorine is an important basic chemical raw material, which is currently mainly prepared by electrolysis of salt water. With the continuous increase of industrial by-product hydrogen chloride and the urgent requirement of the chlorine cycle, the technology of hydrogen chloride catalytic oxidation to chlorine has been widely concerned. [0003] In the process of catalytic oxidation of hydrogen chloride to chlorine, the by-product hydrogen chloride in the process of alkane chlorination, ethylene oxychlorination, MDI and TDI production is usually used as raw material, which contains a small amount of organic substances such as ethylene and chlorobenzene and inorganic substances such as carbon monoxide. These organic and inorganic substances are converted...

Claims

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Application Information

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IPC IPC(8): C25B1/26C25B15/08C02F9/06C02F101/12
CPCC02F1/461C02F1/722C02F1/76C02F2101/12C25B1/26C25B15/08
Inventor 黄旭马斌全张建陈斌武孙策鲁迪
Owner SHANGHAI CHLOR ALKALI CHEM
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