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Method for removing mono-valent negative ion inorganic salt by using nano-filtration constant solvent of forward osmosis technology

An anion, inorganic salt technology, applied in the field of chemical treatment, to achieve the effect of good concentration, less fixed investment and convenient operation

Active Publication Date: 2014-04-09
HANGZHOU TIAN CHUANG ENVIRONMENTAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no report on the research of using forward osmosis technology to carry out constant volume desalination by nanofiltration.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The feed liquid to be treated is a mixed solution of sodium sulfate and sodium chloride, wherein the mass fraction of sodium sulfate is 14%, and the mass fraction of sodium chloride is 5%. Take part of the feed liquid, control the pressure 3.5MPa, and enter the nanofiltration membrane device at a temperature of 25°C for separation to obtain the nanofiltration concentrate and nanofiltration salt-containing leachate, and then put the above-mentioned nanofiltration concentrate and nanofiltration salt-containing leachate into To the forward osmosis membrane device, wherein the nanofiltration concentrated liquid is used as the driving liquid of the forward osmosis membrane device to carry out forward osmosis concentration on the nanofiltration saline leachate; the processed feed liquid can be divided into concentrated feed liquid and highly concentrated saline liquid; The mass fraction of sodium chloride in the concentrated feed liquid is 1%, and the mass fraction of sodium c...

Embodiment 2

[0020] The feed liquid to be treated is a mixed solution of sodium sulfate and sodium chloride, wherein the mass fraction of sodium sulfate is 8%, and the mass fraction of sodium chloride is 15%. Take part of the feed liquid, first dilute it with water until the mass fraction of sodium chloride is 10%, control the pressure 3.0MPa, and enter the nanofiltration membrane device at a temperature of 25°C for separation to obtain nanofiltration concentrated liquid and nanofiltration salt-containing permeate. Filtrate, and then the above-mentioned nanofiltration concentrated solution and nanofiltration salt-containing leachate enter the forward osmosis membrane device, wherein the nanofiltration concentrate is used as the driving solution of the forward osmosis membrane device to carry out forward osmosis concentration on the nanofiltration salt-containing leachate; The processed feed liquid is divided into concentrated feed liquid and highly concentrated saline liquid, and the highly...

Embodiment 3

[0022] The concentrated feed liquid obtained after the treatment of Example 2 is processed again, that is, it enters the treatment of the nanofiltration membrane device and the forward osmosis membrane device, and the pressure is controlled at 3.0 MPa and the temperature is 25 ° C; finally, the concentration of sodium chloride in the concentrated feed liquid can be obtained. The mass fraction is 0.5%.

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PUM

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Abstract

The invention discloses a chemical treatment method, in particular a method for separating mono-valent ions from bivalent or more organics by adopting a film technology. The method comprises the following steps of: separating treated material liquid through a nano-filtration film device, and thus obtaining nano-filtration condensed liquid and nano-filtration salt-contained filtered liquid; and then putting the nano-filtration condensed liquid and the nano-filtration salt-contained filtered liquid which are filtered by the nano-filtration film device into a forward osmosis film device, wherein the nano-filtration condensed liquid serving as driving liquid of the forward osmosis film device is used for performing forward osmosis condensation on the nano-filtration salt-contained filtered liquid, so that a material can be condensed. The method has the advantages that: the treatment can be performed at low temperature or normal temperature, supplied energy caused by temperature raising can be reduced, the method is convenient to operate, and the fixed investment is relatively low; and the separation effect and the condensation effect are relatively good. In the whole process, problems of chemical additives, secondary pollution and the like are solved; and the method is relatively environment-friendly. The method can be widely applied to chemical industrial enterprises.

Description

technical field [0001] The invention relates to a chemical treatment method, in particular to a method for separating monovalent ions from divalent or higher ions and organic matter using membrane technology. technical background [0002] In the production process of organic chemical industry, the problem of desalination and purification of products and intermediates is often encountered. In the production process of inorganic chemical industry, the problem of separation of monovalent ions and multivalent ions is often encountered. In the traditional process, it is often Use the different solubility of each substance in water under different conditions to separate, or use chemical precipitation to separate. For example, in the production process of the pesticide glyphosate, an aqueous solution with 1% glyphosate content and 15% sodium chloride content will be produced. The principle of little change is to crystallize sodium chloride to achieve the purpose of separating sodi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D61/02
Inventor 丁国良赵经纬谢柏明邱晖
Owner HANGZHOU TIAN CHUANG ENVIRONMENTAL TECH