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Refining agent for refining primary brine in chlor-alkali industry and its application

A technology for salt water purification and chlor-alkali chemical industry, which is applied in the purification of alkali metal halides and other directions, can solve the problem of insufficient quality of salt water in resin towers, and achieve the effects of reducing production costs, good application prospects and strong adaptability.

Active Publication Date: 2018-02-27
PANZHIHUA STEEL ENTERPRISES XINYU CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is that in the current chlor-alkali chemical process, the quality of the brine entering the resin tower is still not high enough

Method used

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  • Refining agent for refining primary brine in chlor-alkali industry and its application
  • Refining agent for refining primary brine in chlor-alkali industry and its application

Examples

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Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1 Use the refined preparation of the present invention to prepare primary brine

[0020] The outlet water flow rate of the salt tank is 21.5m per hour 3 , the total amount of calcium and magnesium ions is 74ppm, add 54L sodium phosphate solution containing phosphate radical 40.18g / l in 2# baffle tank per hour, after sodium phosphate fully reacts, measure the salt water phosphate excess value is 0.13g / l, go through figure 1 In the process shown, primary brine is obtained after filtration through a Kai membrane. It is determined that the total amount of calcium and magnesium in the obtained primary brine is 0.0879ppm after Kaymembrane filtration, which can be used in the next resin tower treatment process

Embodiment 2

[0021] Embodiment 2 Use the refined preparation of the present invention to prepare primary brine

[0022] The salt flow rate is 43m per hour 3 , the total amount of calcium and magnesium ions is 78ppm. Add 110L sodium phosphate solution containing phosphate radical 39.75g / l in 2# baffle tank per hour, after sodium phosphate fully reacts, measure the excess value of saltwater phosphate radical to be 0.11g / l, after figure 1 In the process shown, primary brine is obtained after filtration through a Kai membrane. After determination, the total amount of calcium and magnesium in the resulting primary brine is 0.0792ppm. Can be used in the next resin tower treatment process

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Abstract

The invention relates to the field of the chlorine alkali chemical industry, and in particular relates to a novel refining agent for replacing an existing refining agent in a refining process of primary brine in the chlorine alkali industry. The invention aims to solve the technical problem that in the chlorine alkali chemical industry process at present, the quality of brine entering a resin tower is still not high. The technical scheme for solving the technical problem is to provide the novel refining agent used in the refining process of the brine used in the chlorine alkali industry to replace the originally used 'two-alkali' refining agent. The refining agent takes phosphate as an active ingredient. The novel refining agent is strong in adaptability, and can reduce the total amount of calcium and magnesium in the primary brine by 10 times by replacing the original refining agent, so that the operating load of the resin tower is reduced, the regeneration time of the resin tower is prolonged, then the production cost is reduced, and the refining agent has a very good application prospect.

Description

technical field [0001] The invention relates to the field of chlor-alkali chemical industry, in particular to a novel refining agent which replaces the existing refining agent in the primary brine refining process in the chlor-alkali industry. Background technique [0002] In the ion chlor-alkali chemical industry, the brine entering the tank has high quality requirements. After the brine is pretreated by adding sodium hydroxide and sodium carbonate refined preparations to precipitate calcium and magnesium, it needs to enter the filter and ion exchange resin tower for further impurity removal, so as to obtain brine that meets the requirements of the ion membrane alkali production process. [0003] The flow chart of the existing typical production process is as follows: figure 1 shown. Its main steps are: [0004] The brine is a closed-circuit circulation system, dechlorinated light brine from the electrolysis process, part of which is mixed with barium chloride solution (...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D3/14
CPCC01D3/14
Inventor 张芋石玉英
Owner PANZHIHUA STEEL ENTERPRISES XINYU CHEM
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