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 salt mud discharge, Na2SO3 waste, NaClO waste, etc., and achieve the reduction of equipment investment, reduction of addition amount, and reduction of external discharge Effect

Active Publication Date: 2008-10-29
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

1. It is necessary to add reducing substance Na2SO3 to the dechlorination system; it not only causes waste of Na2SO3, but also needs to increase Na2SO3 preparation equipment and pipelines, and the process is complicated
2. The added Na2SO3 increases the impurity content of SO4 2- in the brine system. The existence of SO4 2- will not only affect the electrolysis efficiency and the service

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

Examples

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Example 1

Ion-exchange membrane caustic soda dilute brine purification process, adjust the pH of the dilute brine from the ion-exchange 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 determined to be 40mg / L, and then sent To the first brine process, after adding barium chloride to remove the sulfate radical brought into the system by the raw salt, the water is distributed to the salt tank; NaOH and FeCl3 refined agents are sequentially added to the crude brine from the salt tank to remove magnesium ions, and then added The Na2CO3 refined preparation removes calcium ions. After membrane filtration, the pH is adjusted to 10, and 25mg Na2SO3 is added per liter for dechlorination. The free chlorine in the brine after detection and treatment is below the detection limit, and the organic content is below 10mg / L. Then send secondary brine.

Example Embodiment

Example 2

Ion-exchange membrane caustic soda dilute brine refining process, adjust the pH of the dilute brine from the ion-exchange membrane electrolyzer 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 the first brine process, after adding barium chloride to remove the sulfate radical brought into the system by the raw salt, the water is distributed to the salt tank; NaOH and FeCl3 refined agents are sequentially added to the crude brine from the salt tank to remove magnesium ions, and then added The Na2CO3 refined preparation removes calcium ions. After membrane filtration, the pH is adjusted to 9 and 2mg Na2SO3 is added per liter for dechlorination. The free chlorine content in the tested brine is below the detection limit, and the organic content is below 10mg / L , And then sent 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 dechlorination system 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

Ion-exchange membrane caustic soda dilute brine refining process (1) Technical field The invention relates to an ion-exchange 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 In the production of ion-exchange membrane caustic soda, the dilute brine from the ion-exchange membrane electrolyzer must be returned to the smelting system for smelting. However, since the dilute brine contains a large amount of free chlorine, in order to reduce the corrosion of the equipment and pipelines of the brine system, It needs to go through the dechlorination tower for dechlorination, but after dechlorination, it still contains about 10-100mg / L of free chlorine (mainly in the form of ClO-), and then add the reducing substance Na2SO3 and ClO- to react to completely remove the free chlorine. ClO-+SO3 2-→SO4 2-+Cl- After thorough dechlorination, the dilute brine is sent to a...

Claims

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Application Information

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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
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