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Dual membrane method brine refining technology and device in whole bittern caustic soda production

A brine purification and double-membrane technology, applied in alkali metal halide purification and other directions, can solve the problems of unavailability of high-nitrate brine, weak membrane processing capacity, and small filling area of ​​separation membrane, so as to reduce the types of pharmaceutical dosage and improve the Membrane processing capacity, the effect of saving the cost of chemicals

Active Publication Date: 2016-07-06
JIANGSU NINE HEAVEN HIGH TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem solved by the present invention lies in the shortcomings of existing separation membranes with small filling area and weak membrane processing capacity, and the defect that the high-nitrate brine obtained by nanofiltration cannot be used. The purpose of the present invention is to provide a hollow fiber membrane for ultrafiltration and The double-membrane brine refining process in the all-halogen soda production combined with nanofiltration and denitrification meets the needs of brine refining, and applies calcium denitrification to the treatment of high-nitrate brine in the chlor-alkali industry

Method used

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  • Dual membrane method brine refining technology and device in whole bittern caustic soda production

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Embodiment 1

[0046] Double-membrane brine refining process in all-halogen soda production of the present invention:

[0047] S1: The raw brine extracted from the mine is directly pumped into the brine reaction tank Ⅰ, the NaCl concentration of the raw brine is 305g / L, the calcium content is 0.53g / L, the magnesium content is 0.1g / L, and the sulfate content is 17g / L 1.80g / L of sodium carbonate and 0.52g / L of sodium hydroxide are metered into the brine reaction tank Ⅰ, and Ca 2+ , Mg 2+ The reaction produces CaCO 3 Precipitate and Mg(OH) 2 Colloid, through hollow fiber separation membrane I for ultrafiltration, operating pressure 0.15MPa, membrane flux 85L / m 2 h, the total content of calcium and magnesium in permeate brine is less than 4mg / L;

[0048] S2: The permeate from the ultrafiltration enters the nanofiltration membrane module for nanofiltration after being raised by the high pressure pump, the operating pressure is 2.4MPa, and the membrane flux is 25L / m 2 h, most SO 4 2- After ...

Embodiment 2

[0051] Double-membrane brine refining process in all-halogen soda production of the present invention:

[0052] S1: The raw brine extracted from the mine is directly pumped into the brine reaction tank Ⅰ, the NaCl concentration of the raw brine is 305g / L, the calcium content is 0.53g / L, the magnesium content is 0.1g / L, and the sulfate content is 17g / L 1.80g / L of sodium carbonate and 0.52g / L of sodium hydroxide are metered into the brine reaction tank Ⅰ, and Ca 2+ , Mg 2+ The reaction produces CaCO 3 Precipitate and Mg(OH) 2 Colloid, through hollow fiber separation membrane I for ultrafiltration, operating pressure 0.15MPa, membrane flux 85L / m 2 h, the total content of calcium and magnesium in the permeated liquid brine is less than 4mg / L; the concentrated liquid intercepted by the hollow fiber separation membrane I is sent to the filter press system, and the pressed sludge is transported outside for treatment, and the filter press liquid is recycled;

[0053] S2: The perme...

Embodiment 3

[0056] Double-membrane brine refining process in all-halogen soda production of the present invention:

[0057] S1: The raw brine extracted from the mine is directly pumped into the brine reaction tank Ⅰ, the NaCl concentration of the raw brine is 305g / L, the calcium content is 0.53g / L, the magnesium content is 0.1g / L, and the sulfate content is 17g / L 1.80g / L of sodium carbonate and 0.52g / L of sodium hydroxide are metered into the brine reaction tank Ⅰ, and Ca 2+ , Mg 2+ The reaction produces CaCO 3 Precipitate and Mg(OH) 2 Colloid, through hollow fiber separation membrane I for ultrafiltration, operating pressure 0.15MPa, membrane flux 85L / m 2 h, the total content of calcium and magnesium in the permeated liquid brine is less than 4mg / L; the concentrated liquid intercepted by the hollow fiber separation membrane I is sent to the filter press system, and the pressed sludge is transported outside for treatment, and the filter press liquid is recycled;

[0058] S2: The perme...

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Abstract

The invention relates to a dual membrane method brine refining technology and device in whole bittern caustic soda production, and belongs to the technical field of brine refining. The technology comprises the following steps: step one, refining bittern, and then introducing refined bittern into a hollow fiber separating membrane (I); step two, mixing the filtrate and brine (I), introducing the mixture into a nano filtration membrane system, wherein the nano filtration membrane divides the brine into two parts namely low nitrite brine and high nitrite brine, adding Ca<2+> into high nitrite brine to generate calcium sulfate, and carrying out solid-liquid separation to obtain calcium sulfate solids; step three, after nano filtration, adsorbing the filtrate by resin to obtain refined brine, and finally delivering the refined brine to an ionic membrane caustic soda production system. The adopted technology can reduce membrane pollution and improve the membrane processing ability. The technology is more advanced, moreover, the technology process is simple, the resource utilization rate is high, the investment and production cost is low, the operation is safe and convenient, and great economic benefits and social benefits are generated.

Description

technical field [0001] The invention relates to a double-membrane brine refining process and device in all-halogen soda production, in particular to a hollow fiber membrane combined with a nanofiltration membrane double-membrane brine refining process. Background technique [0002] At present, the domestic chlor-alkali industry mainly adopts the ion-exchange membrane method to make alkali, and uses saturated brine as raw material to electrolyze to produce sodium hydroxide and other products. with OH on the anode - The insoluble matter generated by the reaction is deposited on the ionic membrane, which seriously affects the life of the ionic membrane. However, the sulfate radical cannot pass through the ionic membrane and accumulates in the brine system. After reaching a certain concentration, it will discharge at the anode, and the generation of free oxygen will cause serious damage to the anode. Therefore, brine refining is extremely important in the production process o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/14
CPCC01D3/14C01P2006/80
Inventor 石风强庆珺余从立纪祖焕
Owner JIANGSU NINE HEAVEN HIGH TECH
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