CN1759923A - Method through hyper filtration method for treating aqueous solution of dense etio sodium chloride - Google Patents
Method through hyper filtration method for treating aqueous solution of dense etio sodium chloride Download PDFInfo
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- CN1759923A CN1759923A CN 200410064992 CN200410064992A CN1759923A CN 1759923 A CN1759923 A CN 1759923A CN 200410064992 CN200410064992 CN 200410064992 CN 200410064992 A CN200410064992 A CN 200410064992A CN 1759923 A CN1759923 A CN 1759923A
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- sodium
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- chloride water
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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
The present invention relates to separate the commercial run of sodium chloride and purification sodium sulphate with reverse osmosis membrane.
Background technology
The pressure-driven membrane separating method is known, this method is to apply positive osmotic pressure by the side to filter membrane to make organic molecule or inorganic molecule ionization in the aqueous solution, solubility is concentrated or is split in various degree, and the method for this class press filtration has reverse-permeation process (RO), ultrafiltration (UF) and nano filtering process (NF).
The patent of invention of CN1180322A discloses " method of dense saline solution nanofiltration ", utilized the monovalent ion of nanometer film just to high salt concentration, particularly the repulsive interaction of chlorion influence is very little, the principle that does not perhaps have influence, after the nanofiltration effect, common salt concentration in the concentrate is almost equal or lower slightly with respect to the NaCl concentration in the material liquid, be that NaCl concentration in the concentrate is less than or equal to the NaCl concentration in the material liquid, this concentrate can't directly utilize, not only raw material is wasted, but also pollutes.
Summary of the invention
The object of the invention is to invent a kind of reverse osmosis membrane that utilizes, not only can in diffusate, obtain the high sodium chloride of content, metabisulfite solution that content is low, and the hyperfiltration that can also utilize concentrate directly to extract sodium sulphate is handled the dense method of sodium-chloride water solution just.
The present invention with dense sodium-chloride water solution just just be pressed into that the desalination rate is 90～93%, in the low pressure, energy-conservation, charged reverse osmosis membrane, the sodium sulphate clearance is 80～95% in the diffusate, and its concentrate is isolated sodium sulphate through cold process technique of nitrate removal or hot method technique of nitrate removal.
It is 90～93% that the present invention has adopted the desalination rate, have low pressure, energy-conservation, charged reverse osmosis membrane, it is the RO film, chlorion in the stoste there is certain crown_interception, can effectively improve the sodium chloride content in the concentrate, further directly remove nitre or hot method is removed the nitre separating sodium sulfate with this concentrate, need not in concentrate, to add solid sodium chloride by cold process.Therefore, the present invention is the simple and easy method of pollution-free, the low energy consumption of membrane separating sodium chloride and sodium sulphate.
In stoste, when promptly containing 50～220 grams per liter sodium chloride, 5～15 grams per liter sodium sulphate in the concentrated sodium chloride aqueous solution, more can manifest superiority of the present invention.
Filter pressure of the present invention is 2.0～3.0MPa.
Specific embodiment
It is 90～93% that the desalination rate is installed, and has low pressure, energy-conservation, charged reverse osmosis membrane, and promptly the RO membrane module is connected material liquid import, concentrated solution outlet, leaches mouth with pipeline respectively.
Just be pressed into dense sodium-chloride water solution material liquid just to the material liquid import, contain 50～220 grams per liter sodium chloride, 5～15 grams per liter sodium sulphate in the material liquid, obtain filter liquor leaching mouth, obtain concentrate at the concentrated solution outlet pipeline, and concentrate carried out cold process is removed nitre or hot method is removed nitre, isolate the sulfate crystal body.
Example one:
The material liquid that will contain 220 grams per liter sodium chloride, 10 grams per liter sodium sulphate is pressed into above-mentioned membrane module, and filter pressure is 2.2MPa, and sodium sulphate content is 1 grams per liter in its diffusate, and sodium chloride content is 180 grams per liters; Sodium sulphate content is 28 grams per liters in the concentrate, and sodium chloride content is 280.5 grams per liters.
Cold process is removed nitre: above-mentioned concentrate is cooled to about-5 ℃, and sulfate crystal is separated out.
Example two:
The material liquid that will contain 180 grams per liter sodium chloride, 10 grams per liter sodium sulphate is pressed into above-mentioned membrane module, and filter pressure is 2.0MPa, and sodium sulphate content is 0.9 grams per liter in its diffusate, and sodium chloride content is 160 grams per liters; Sodium sulphate content is 30 grams per liters in the concentrate, and sodium chloride content is 270.5 grams per liters.
Hot method is removed nitre: above-mentioned concentrate is warming up to about 120 ℃, and sulfate crystal is separated out.
Claims (4)
1, a kind of hyperfiltration is handled the dense method of sodium-chloride water solution just, it is characterized in that with dense sodium-chloride water solution just just be pressed into that the desalination rate is 90～93%, in the low pressure, energy-conservation, charged reverse osmosis membrane, the sodium sulphate clearance is 80～95% in the diffusate, and its concentrate is isolated sodium sulphate through cold process technique of nitrate removal or hot method technique of nitrate removal.
2, handle the dense method of sodium-chloride water solution just according to the described hyperfiltration of claim 1, it is characterized in that containing 50～220 grams per liter sodium chloride in the dense first sodium-chloride water solution.
3, handle the dense method of sodium-chloride water solution just according to claim 1 or 2 described hyperfiltrationes, it is characterized in that containing 5～15 grams per liter sodium sulphate in the dense first sodium-chloride water solution.
4, handle the dense method of sodium-chloride water solution just according to the described hyperfiltration of claim 1, it is characterized in that filter pressure is 2.0～3.0Mpa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410064992 CN1759923A (en) | 2004-10-15 | 2004-10-15 | Method through hyper filtration method for treating aqueous solution of dense etio sodium chloride |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410064992 CN1759923A (en) | 2004-10-15 | 2004-10-15 | Method through hyper filtration method for treating aqueous solution of dense etio sodium chloride |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1759923A true CN1759923A (en) | 2006-04-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200410064992 Pending CN1759923A (en) | 2004-10-15 | 2004-10-15 | Method through hyper filtration method for treating aqueous solution of dense etio sodium chloride |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102320625A (en) * | 2011-06-01 | 2012-01-18 | 杭州天创净水设备有限公司 | Treatment method of sodium chloride solution containing sodium sulfate |
| CN102351362A (en) * | 2011-08-08 | 2012-02-15 | 天威四川硅业有限责任公司 | Treatment method for waste water with high chloride ion content in polysilicon production |
| CN102806013A (en) * | 2012-05-04 | 2012-12-05 | 北京化工大学 | Method for desalting waste liquid generated during production of soda ash by using nanofiltration membrane device |
| CN102933507A (en) * | 2010-06-15 | 2013-02-13 | 通用电气公司 | Seawater desalination plant and production of high purity salt |
-
2004
- 2004-10-15 CN CN 200410064992 patent/CN1759923A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102933507A (en) * | 2010-06-15 | 2013-02-13 | 通用电气公司 | Seawater desalination plant and production of high purity salt |
| CN102320625A (en) * | 2011-06-01 | 2012-01-18 | 杭州天创净水设备有限公司 | Treatment method of sodium chloride solution containing sodium sulfate |
| CN102351362A (en) * | 2011-08-08 | 2012-02-15 | 天威四川硅业有限责任公司 | Treatment method for waste water with high chloride ion content in polysilicon production |
| CN102806013A (en) * | 2012-05-04 | 2012-12-05 | 北京化工大学 | Method for desalting waste liquid generated during production of soda ash by using nanofiltration membrane device |
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