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Method through hyper filtration method for treating aqueous solution of dense etio sodium chloride

A sodium chloride aqueous solution, concentrated primary sodium chloride technology, applied in osmosis/dialysis water/sewage treatment, reverse osmosis and other directions, can solve problems such as pollution, waste of raw materials, inability to use directly, and achieve the effect of low energy consumption

Inactive Publication Date: 2006-04-19
凯膜过滤技术(上海)有限公司
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Problems solved by technology

[0003] The invention patent of CN1180322A discloses the "nanofiltration method of concentrated brine solution", which utilizes the principle that the nano-membrane has little or no influence on the repulsion of monovalent ions with high salt concentration, especially chloride ions. After nanofiltration, the concentration of sodium chloride in the concentrated solution is almost equal or slightly lower than that of the NaCl in the raw material, that is, the concentration of NaCl in the concentrated solution is less than or equal to the concentration of NaCl in the raw material. This concentrated solution cannot be directly Utilization, not only the raw materials are wasted, but also cause pollution

Method used

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Examples

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Effect test

example 1

[0012] The raw material containing 220 g / L sodium chloride and 10 g / L sodium sulfate is hydraulically injected into the above membrane module, the filtration pressure is 2.2 MPa, the content of sodium sulfate in the exudate is 1 g / L, and the content of sodium chloride is 180 grams per liter; the content of sodium sulfate in the concentrated solution is 28 grams per liter, and the content of sodium chloride is 280.5 grams per liter.

[0013] Cold denitrification: Cool the above-mentioned concentrated solution to about -5°C, and sodium sulfate crystallizes out.

example 2

[0015] The raw material containing 180 g / L sodium chloride and 10 g / L sodium sulfate is hydraulically injected into the above membrane module, the filtration pressure is 2.0 MPa, the content of sodium sulfate in the exudate is 0.9 g / L, and the content of sodium chloride is 160 grams per liter; the content of sodium sulfate in the concentrated solution is 30 grams per liter, and the content of sodium chloride is 270.5 grams per liter.

[0016] Thermal denitrification: raise the temperature of the above-mentioned concentrated solution to about 120°C, and sodium sulfate crystallizes out.

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Abstract

A process for treating the raw concentrated aqueous solution of sodium chloride by reverse osmosis method features that under the action of positive pressure, said aqueous solution flows through a reverse osmosis membrane for removing 80-95% of sodium sulfate, and the concentrated liquid is denitrified by cold or hot method for separating sodium sulfate, so effectively increasing the content of sodium chloride.

Description

technical field [0001] The invention relates to an industrial method for separating sodium chloride and purifying sodium sulfate by reverse osmosis membrane method. Background technique [0002] The pressure-driven membrane separation method is well known, which is to ionize the organic or inorganic molecules in the aqueous solution by applying positive osmotic pressure to one side of the filter membrane, and the solubility is concentrated or separated to different degrees. Press filtration methods include reverse osmosis (RO), ultrafiltration (UF) and nanofiltration (NF). [0003] The invention patent of CN1180322A discloses the "nanofiltration method of concentrated brine solution", which utilizes the principle that the nano-membrane has little or no influence on the repulsion of monovalent ions with high salt concentration, especially chloride ions. After nanofiltration, the concentration of sodium chloride in the concentrated solution is almost equal or slightly lower t...

Claims

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Application Information

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IPC IPC(8): B01D61/02C02F1/44
Inventor 李国新
Owner 凯膜过滤技术(上海)有限公司
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