Method for concentrating chlor-alkali anode light salt brine

A technology of brackish water and anode, applied in the field of anode brackish water, can solve the problems such as inability to concentrate and reuse brackish water with high efficiency and low energy consumption, and achieve the effect of saving pretreatment cost, reducing water vapor pressure, and reducing equipment investment.

Active Publication Date: 2020-05-15
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

None of these methods can realize the concentration and reuse of light brine with high efficiency and low energy consumption

Method used

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  • Method for concentrating chlor-alkali anode light salt brine
  • Method for concentrating chlor-alkali anode light salt brine
  • Method for concentrating chlor-alkali anode light salt brine

Examples

Experimental program
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Effect test

Embodiment 1

[0048] The invention provides a method for concentrating chlor-alkali anode brine. According to production requirements, the anode brine electrolyzed from an ion-exchange membrane electrolyzer is dechlorinated and denitrified, and then entered into a raw material solution storage tank of a membrane distillation system, and obtained after desalination. The saturated crude brine enters the permeate storage tank of the membrane distillation system.

[0049] (1) Pass the anode light brine into the raw material liquid storage tank of the membrane distillation system, the concentration of sodium chloride in the light brine is 180g / L, no free chlorine, and the temperature is 50°C.

[0050] (2) Pass the saturated crude brine after desalting into the permeation side of the membrane distillation system, the concentration of saturated crude brine NaCl is 310g / L, Ca 2+ , Mg 2+ and SO 4 2- The concentration of other hetero ions is lower than 10g / L, and the temperature is 20°C.

[0051]...

Embodiment 2

[0055] The operation steps of Example 2 are the same as those in Example 1. The difference from Example 1 is that in order to further shorten the concentration time of the anode brine, the flow rate of the feed liquid on both sides of the membrane module is adjusted to 600mL / min, and the running time can be shortened to 40 minutes. The composition of the final light brine is shown in Table 2. The concentrated light brine enters the ion-exchange membrane electrolyzer to realize the reuse of the anode light brine.

[0056] The invention utilizes the osmotic membrane distillation technology to concentrate the anode brine. Membrane distillation uses a hydrophobic microporous membrane, and uses the vapor pressure difference on both sides of the membrane as the driving force for mass transfer, so as to achieve efficient concentration and treatment of the solution. Especially in areas rich in waste heat, solar energy and geothermal resources, membrane distillation technology is consi...

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Abstract

The invention relates to a method for concentrating chlor-alkali anode light salt brine. The method comprises the following steps: step 1, respectively introducing dechlorinated and denitrified anodelight salt brine and saturated crude brine subjected to salt melting into a raw material liquid circulating storage tank and a penetrating fluid circulating storage tank in an osmotic membrane distillation concentration system; step 2, opening a raw material side circulating pump and a permeation side circulating pump, and opening a membrane component valve; and introducing the dechlorinated and denitrified anode light salt brine into the raw material side of the membrane distillation device from the raw material liquid circulating tank, enabling effluent liquid at the raw material side of themembrane distillation device to flow back to the raw material liquid circulating tank, introducing saturated crude brine subjected to salt melting into the permeation side of the membrane distillation device from the permeation liquid circulating tank, and enabling effluent liquid at the permeation side of the membrane distillation device to flow back to the permeation liquid circulating tank toform circulation; and step 3, when the concentration of sodium chloride is concentrated to 240-320 g/L, stopping circulation. The method can obviously improve the concentration rate, shorten the treatment time and reduce the equipment investment.

Description

technical field [0001] The invention relates to the technical field of ionic membrane caustic soda production, in particular to a method for concentrating anode brine discharged from an electrolytic cell in ionic membrane caustic soda production by using permeable membrane distillation technology. Background technique [0002] The raw material used in the ion membrane alkali production method is mainly coarse salt, and the content of the main component sodium chloride is greater than 96%. The technological process is mainly divided into the following procedures: salt formation, primary refining of brine, secondary refining of brine, ion membrane electrolysis. First, the crude salt is subjected to the salt process in the salt tank to produce crude brine containing 310g / L sodium chloride and then enters the primary refining process. In a refining process, after successively adding soda ash, caustic soda and barium chloride to the crude brine, the Ca in the crude brine 2+ , M...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/36C25B15/08C25B1/46
CPCB01D61/364B01D61/366C25B1/46C25B15/08
Inventor 邓会宁刘国驰胡柏松张忠明张少峰
Owner HEBEI UNIV OF TECH
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