High-concentration salt water nano-filtration membrane bidirectional separating device and method

A two-way separation, concentrated brine technology, applied in chemical instruments and methods, water/sewage treatment, water/sewage treatment equipment, etc., can solve the problems of complicated operation and high investment and operation cost of evaporation and salt separation, to simplify the process, reduce The effect of one-time investment and operating costs, and overall low energy consumption

Pending Publication Date: 2017-12-22
SHAANXI RES DESIGN INST OF PETROLEUM CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The raw water quality and wastewater treatment process determine that the salt components in most high-concentration brines are currently sodium sulfate and sodium chloride. The targeted zero-emission process is mainly evaporation and salt separation. This process is based on the phase diagram theory for salt separation. It can be divided into thermal method and cold method, but the investment and operation cost of evaporation and salt separation is relatively high, and the operation is more complicated

Method used

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  • High-concentration salt water nano-filtration membrane bidirectional separating device and method
  • High-concentration salt water nano-filtration membrane bidirectional separating device and method
  • High-concentration salt water nano-filtration membrane bidirectional separating device and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The water volume is 30m 3 / h, the influent salt content (TDS) is 4%, the sodium chloride content is 2.5%, the sodium sulfate content is 1.5%, and the high-concentration brine with impurities 2 SO 4 Separation results of mixed brine with NaCl.

[0027]

Embodiment 2

[0029] The water volume is 30m 3 / h, the influent salt content (TDS) is 3%, among which the sodium chloride content is 1.5%, the sodium sulfate content is 1.5% as an example, and the high-concentration brine with impurities 2 SO 4 Separation results of mixed brine with NaCl.

[0030]

[0031] Examples 1 and 2 show that the product purity of two-way concentration is artificially controlled by adjusting the concentration ratio. When the concentration ratio is about 7, the purity of sodium chloride on the product water side reaches more than 95% ("Industrial Salt GBT5462-2015" Industrial Dry Salt Superior Grade product requirements), and at the same time, the purity of sodium sulfate on the concentrated water side reaches more than 95% ("GBT 6009-2014 Industrial Anhydrous Sodium Sulfate" three qualified products); and the reverse migration of sodium chloride is greater than the residual sodium sulfate, making the product water The concentration of sodium chloride increases. ...

Embodiment 3

[0033] The water volume is 30m 3 / h, the salt content (TDS) of the influent water is 4%, among which the sodium chloride content is 1.5%, the sodium sulfate content is 2.5% Control different concentration ratios, measure salt content and component purity in its concentrated water tank and product water tank by sampling titration, test result is as shown in table 3, and table 3 is the present invention under different concentration ratios to Na 2 SO 4 Separation results of mixed brine with NaCl.

[0034]

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PUM

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Abstract

The invention discloses a high-concentration salt water nano-filtration membrane bidirectional separating device and a high-concentration salt water nano-filtration membrane bidirectional separating method. Univalent salt is separated from bivalent salt through a nano-filtration device by intruding high-concentration salt water to be treated into a primary liquid trough; bidirectional separating is realized and required purity is achieved by performing nano-filtration treatment on a two-component inorganic salt solution; the nano-filtration in specific application ensures the purity of sodium chloride, simultaneously takes the purification of sodium sulphate into consideration, and has the advantages of helping to realize resource of salt to the greatest extent and the like. The process of performing nano-filtration and evaporating can be greatly simplified and the one-time investment and the operating cost of a salt separating device are reduced when the device and the method are applied to engineering.

Description

technical field [0001] The invention relates to the separation of multi-component salts in high-concentration brine, in particular to a nanofiltration membrane bidirectional separation device and method for high-concentration brine, which is especially suitable for the separation and purification of sodium sulfate and sodium chloride in the process of recycling waste salt. Background technique [0002] The process of chemical wastewater treatment will produce a large amount of high-concentration brine. In recent years, the zero discharge of high-concentration brine has become a backup condition for whether a new chemical project can be approved, and even whether the operating device can continue to produce. [0003] Zero discharge not only requires all the water to be reused, but also requires the solid waste to be harmless or even recycled. For most enterprises, due to the complex salt content of wastewater, if no salt separation treatment is carried out, the mixed salt or m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/08C02F1/44
CPCB01D61/08C02F1/442C02F2201/007
Inventor 田磊马红鹏齐永红巢志理
Owner SHAANXI RES DESIGN INST OF PETROLEUM CHEM IND
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