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Ionic membrane caustic soda light salt brine fine purification technique

A technology of ionic membrane caustic soda and light brine, applied in the direction of alkali metal chloride, etc., can solve the problems of increasing NaClO preparation equipment and pipelines, affecting the service life of electrolysis efficiency, increasing salt mud discharge, etc., so as to reduce varieties and consumption, ensure Effects of operation and pollution reduction

Active Publication Date: 2010-08-04
昊华宇航化工有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1. Need to add reducing substance Na to the dechlorination system 2 SO 3 ; both cause Na 2 SO 3 waste, and need to increase Na 2 SO 3 Preparation of equipment and pipelines, complex process
[0006] 2. Added Na 2 SO 3 causing SO in brine systems 4 2- The impurity content increased, SO 4 2- The existence of will not only affect the electrolysis efficiency and the service life of the membrane, but also need to add BaCl 2 Removed, increased production cost, also increased discharge of salt mud
[0007] 3. In the brine refining process, NaClO needs to be added to remove organic matter and bacteria and algae impurities, which not only causes waste of NaClO, but also requires additional NaClO preparation equipment and pipelines, and the process is complicated

Method used

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  • Ionic membrane caustic soda light salt brine fine purification technique
  • Ionic membrane caustic soda light salt brine fine purification technique
  • Ionic membrane caustic soda light salt brine fine purification technique

Examples

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Embodiment 1

[0020] Ionic membrane caustic soda light brine refining process, adjust the pH of the light brine from the ion membrane electrolyzer to 2.0, and then pump it into the vacuum dechlorination tower for dechlorination. After dechlorination, the free chlorine content in the brine is detected to be 40mg / L, and then sent to To the first brine process, add barium chloride to remove the sulfate radical brought into the system by the raw salt, then distribute the water and send it to the salt tank; add NaOH, FeCl to the crude brine coming out of the salt tank in sequence 3 Refining removes magnesium ions and then adds Na 2 CO 3 The refined preparation removes calcium ions, adjusts the pH value to 10 after membrane filtration, and adds 25 mg of Na per liter 2 SO 3 Dechlorination, the free chlorine in the treated brine is lower than the detection limit, and the organic matter content is below 10mg / L, and then sent to the secondary brine.

Embodiment 2

[0022] Ionic membrane caustic soda light brine refining process, adjust the pH of the light brine from the ion membrane electrolytic cell to 1.3, and then pump it into the vacuum dechlorination tower for dechlorination. After dechlorination, the free chlorine content in the brine is detected to be 15mg / L, and then sent to To the first brine process, add barium chloride to remove the sulfate radical brought into the system by the raw salt, then distribute the water and send it to the salt tank; add NaOH, FeCl to the crude brine coming out of the salt tank in sequence 3 Refining removes magnesium ions and then adds Na 2 CO 3 The refined preparation removes calcium ions, adjusts the pH value to 9 after membrane filtration, and adds 2 mg of Na per liter 2 SO 3 Dechlorination, the content of free chlorine in the treated brine is lower than the detection limit, and the content of organic matter reaches below 10mg / L, and then sent to the secondary brine.

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Abstract

The invention relates to a refining process for fresh brine of ion film caustic soda, in particular to dechlorination of the fresh brine and desorption of organics in the fresh brine; wherein, the fresh brine from an ion-exchange membrane electrolyzer is dechlorinated by a dechlorination tower to a range that the process allows, sent to a first brine process, added barium salt to remove sulfate radical brought in the system by material salt, and then is sent to a salt dissolving tank after water distribution; crude brine from the salt dissolving tank is added a refining agent for purification, Na2SO3 for dechlorination and a PH regulator in sequence, and then is sent to a second brine process after processing. The process is simple, reduces the process of adding Na2SO3 in a dechlorinationsystem and that of adding NaClO in a brine refining system, reduces the variety and quantity of additives, decreases equipment investment and correspondingly saves power consumption of the part as well as alleviates the environmental pollution.

Description

(1) Technical field [0001] The invention relates to an ion membrane caustic soda dilute brine refining process, in particular to the dechlorination of dilute brine and the removal of organic matter therein. (2) Background technology [0002] In the production of ion-exchange membrane caustic soda, the light brine from the ion-exchange membrane electrolyzer must be returned to the salt system for salt formation. However, since the light brine contains a large amount of free chlorine, in order to reduce its corrosion on the equipment and pipelines of the brine system, It needs to be dechlorinated by dechlorination tower, but after dechlorination, it still contains about 10-100mg / L of free chlorine (mainly ClO - form), and then add the reducing substance Na 2 SO 3 and ClO - reaction to completely remove free chlorine. [0003] ClO - +SO 3 2- → SO 4 2- +Cl - [0004] The light brine after complete dechlorination is sent to a brine process, adding BaCl 2 Removed by or...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D3/04
Inventor 刘志强赵述彬郭金星王志勇
Owner 昊华宇航化工有限责任公司