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Method for lowering content of monovalent ions in final concentrate of nanofiltration system and nanofiltration system

A technology of ion content and concentrate, applied in the field of nanofiltration system, can solve the problems of high monovalent ion content and incomplete separation of brine, and achieve the effect of improving separation efficiency and complete separation

Pending Publication Date: 2018-10-16
威立雅水务技术(无锡)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, nanofiltration systems often have incomplete separation problems in the treatment of brine, specifically, the content of monovalent ions in the final concentrate of the system is still high

Method used

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  • Method for lowering content of monovalent ions in final concentrate of nanofiltration system and nanofiltration system
  • Method for lowering content of monovalent ions in final concentrate of nanofiltration system and nanofiltration system
  • Method for lowering content of monovalent ions in final concentrate of nanofiltration system and nanofiltration system

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0047] Example 1 uses such as figure 1 The nanofiltration system 100 shown in , processes brines containing sodium chloride and sodium sulfate. The concentrations of sodium chloride and sodium sulfate in the brine are 10g / L and 18g / L respectively, and the brine is 3 The flow rate of / h is passed into the nanofiltration system 100, and the specific operating parameters are shown in Table 1.

[0048] Table 1.

[0049]

[0050] Can draw from Table 1, the content of sodium chloride in the feed liquid is 10g / L, and the content of sodium chloride in the final concentrate is 4g / L, and the sodium chloride content in the final concentrate is lower.

example 2

[0052]Example 2 is used as figure 2 The nanofiltration system 200 shown in , processes brines containing sodium chloride and sodium sulfate. The concentrations of sodium chloride and sodium sulfate in the brine are 10g / L and 10g / L respectively, and the brine is 3 The flow rate of / h is passed into the nanofiltration system 200, and the specific operating parameters are as shown in Table 2.

[0053] Table 2.

[0054]

[0055] Can draw from Table 2, the content of sodium chloride in the feed liquid is 10g / L, and the content of sodium chloride in the final concentrate is 4g / L, and the sodium chloride content in the final concentrate is lower.

example 3

[0057] Example 3 is used as image 3 The nanofiltration system 300 shown in , processes brines containing sodium chloride and sodium sulfate. The concentrations of sodium chloride and sodium sulfate in the brine are 10g / L and 10g / L respectively, and the brine is 3 The flow rate of / h is passed into the nanofiltration system 300, and the specific operating parameters are as shown in Table 3.

[0058] table 3.

[0059]

[0060] As can be seen from Table 2, the content of sodium chloride in the incoming liquid is 10g / L, and the content of sodium chloride in the final concentrated solution is 1.3g / L, and the content of sodium chloride in the final concentrated solution is relatively low.

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Abstract

The invention discloses a method for lowering content of monovalent ions in final concentrate of a nanofiltration system and a corresponding nanofiltration system. The nanofiltration system comprisesnanofiltration membrane components of at least three sections, wherein concentrate of each section flows into next stage. The method comprises the steps: inputting feed liquor to one section to produce a concentrated solution; returning a first part of the concentrated solution to the corresponding section; and controlling the pH value of the feed liquor to 2 to 7, and controlling the temperatureof the feed liquor to 20 DEG C to 60 DEG C, wherein the feed liquor comprises at least one part of an upstream concentrated solution and the first part of the concentrated solution, and the upstream concentrated solution means a concentrated solution produced from last section of the corresponding section. According to the method and the system, disclosed by the invention, the content of the monovalent ions in the final concentrate can be greatly lowered during nanofiltration separation, and more complete separation is achieved.

Description

technical field [0001] The invention relates to a nanofiltration system, in particular to a method for reducing the content of monovalent ions in the final concentrate of the nanofiltration system, and a corresponding nanofiltration system. Background technique [0002] Nanofiltration (Nanofiltration, NF) is a new membrane separation technology between reverse osmosis and ultrafiltration. The relative molecular mass cut-off of the nanofiltration membrane is between 200-2000, and the membrane pore size is about 1-2nm. It is suitable for separating dissolved components with a size of about 1nm, so it is called "nanofiltration" or "nanofiltration". The nanofiltration membrane can effectively intercept divalent and high-valent ions and organic substances with a relative molecular mass greater than 200, while allowing most monovalent inorganic salts to pass through. [0003] Nanofiltration membranes are typically used in the form of membrane elements, such as coiled membrane ele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/02B01D61/08
CPCB01D61/027B01D61/08B01D61/0271B01D2311/2523C02F1/442B01D2311/10B01D2311/18B01D2311/246B01D2317/022C02F2209/02C02F2209/06C02F2209/40C02F2301/046C02F2301/08C02F2101/12
Inventor 翟建文罗敏
Owner 威立雅水务技术(无锡)有限公司
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