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Method for treating and cycling light salt brine containing sodium carbonate and sodium hypochlorite

A technology of sodium hypochlorite and sodium carbonate, applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problem that sodium chloride and sodium carbonate cannot be effectively used and increase the amount of wastewater treatment in enterprises The amount and treatment cost and other issues can be solved to achieve the effects of saving waste water treatment cost and raw material cost, easy operation and environmental protection

Active Publication Date: 2018-01-16
SHANGHAI CHLOR ALKALI CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] This kind of waste liquid containing sodium carbonate and sodium hypochlorite light brine is generally discharged as industrial wastewater after treatment, which not only increases the amount and cost of wastewater treatment in enterprises, but also the sodium chloride and sodium carbonate in the waste liquid cannot be effectively utilized.

Method used

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  • Method for treating and cycling light salt brine containing sodium carbonate and sodium hypochlorite
  • Method for treating and cycling light salt brine containing sodium carbonate and sodium hypochlorite
  • Method for treating and cycling light salt brine containing sodium carbonate and sodium hypochlorite

Examples

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Effect test

Embodiment 1

[0027] (1) 1000kg of light brine containing sodium carbonate and sodium hypochlorite (see Table 1 for specific components and content) produced by the hydrogen chloride catalytic oxidation chlorine production device is delivered to the baffle tank, and adding a weight concentration in the baffle tank is a 31% hydrochloric acid solution , adjust the pH to 8, transport to the reaction kettle, the stirring of the reaction kettle is in the normal open state, and the temperature of the solution in the tower kettle is maintained at 40°C through the jacketed hot water, and the reaction is carried out for 240 minutes, so that the sodium hypochlorite is decomposed. The solution is pumped to the middle tank;

[0028] (2) Adding the sodium hydroxide solution that the weight concentration is 32% in the middle tank, adjust the pH to 12, and add anhydrous sodium sulfite, react for 15 minutes, and the treatment solution obtained (see Table 1 for specific components and contents) is delivered ...

Embodiment 2

[0043] (1) 1000kg of light brine containing sodium carbonate and sodium hypochlorite (see Table 3 for specific components and content) produced by the hydrogen chloride catalytic oxidation chlorine production device is delivered to the baffle tank, and the hydrochloric acid solution that is 31% by weight is added in the baffle tank , adjust the pH to 8.5, transport to the reactor, the reactor is in the normal state of stirring, and the temperature of the solution in the tower kettle is maintained at 60°C through the jacketed hot water, and react for 180 minutes to make the sodium hypochlorite decompose. The solution is pumped to the middle tank;

[0044] (2) Adding the sodium hydroxide solution that the weight concentration is 32% in the intermediate tank, adjust the pH to 11, and add anhydrous sodium sulfite, react for 15 minutes, and the treatment solution obtained (see Table 3 for specific components and contents) is delivered to In the reactor after the brine section; wher...

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Abstract

The invention discloses a method for treating and cycling light salt brine containing sodium carbonate and sodium hypochlorite. The method comprises: (1) adding hydrochloric acid to light salt brine containing sodium carbonate and sodium hypochlorite for a reaction; (2) adding sodium hydroxide, and adding sodium sulfite for a reaction to obtain a treatment fluid; (3) reacting the treatment fluid obtained from the step (2) with crude brine, and performing filtration to obtain pre-treated brine; and (4) adding hydrochloric acid to the pre-treated brine obtained from the step (3) to obtain primary fine brine, which is used for electrolytic production of chlorine and caustic soda. According to the method, light salt brine containing sodium carbonate and sodium hypochlorite is efficiently treated and cycled. A waste liquid is treated mainly through decomposition of sodium hypochlorite itself, so that the consumption of a treatment agent is greatly reduced, the enterprise cost is reduced, and the environment is protected. The method is simple in process, less in equipment investment, and easy to operate. The waste liquid treatment cost and raw material cost are saved for enterprises, andenvironmental pollution probably resulting from waste liquid discharge is greatly reduced.

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 light brine containing sodium carbonate and sodium hypochlorite. Background technique [0002] 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, and the organic matter and inorganic substances such as carbon monoxide contained in it are destroyed in the process of hydrogen chloride catalytic oxidation It is converted into carbon dioxide and enters the product separation system together with the product chlorine and unconverted hydrogen chloride and oxygen. [0003] In the product separation system, most of the unconverted hydrogen chloride is removed by water absorption, and most of the chlorine gas is frozen by freezing, leaving oxygen and carbon dioxi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/12C02F101/10
Inventor 黄旭马斌全崔巍袁茂全陈斌武张建
Owner SHANGHAI CHLOR ALKALI CHEM