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A method for separating sodium chloride and glycerin in high-salt glycerin-containing wastewater

A separation method, sodium chloride technology, applied in chemical instruments and methods, alkali metal chloride, water/sewage multi-stage treatment, etc., can solve the problems of waste of resources, ineffective treatment and recycling, pollution of the environment, etc. To achieve the effect of ensuring feasibility

Inactive Publication Date: 2015-11-18
BOYING XIAMEN SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For a long time, most of the high-salt glycerin-containing wastewater such as epichlorohydrin production wastewater, epoxy resin production wastewater, soap-making industrial wastewater, and biodiesel production wastewater in China has always been discharged in excess of the standard. The high-concentration sodium chloride and Glycerin has not been effectively treated and recycled, which not only pollutes the environment, but also causes a great waste of resources

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  • A method for separating sodium chloride and glycerin in high-salt glycerin-containing wastewater

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Effect test

Embodiment 1

[0037] A method for separating sodium chloride and glycerin in high-salt glycerin-containing wastewater.

[0038] (1) Complexation

[0039] Alkaline solution and copper sulfate are added to the high-salt glycerol-containing wastewater, so that the glycerol contained in the wastewater undergoes a complex reaction with copper ions under alkaline conditions to form glycerol copper.

[0040] The concentration of sodium chloride in the high-salt glycerin-containing wastewater is 30%, the concentration of glycerin is 2%, and the alkaline solution is sodium hydroxide solution.

[0041] (2) Nanofiltration desalination (separation of glycerol and salt)

[0042] The waste water after the complexation treatment in step (1) is desalted by graded filtration through a nanofiltration membrane to obtain a nanofiltration concentrate containing copper glycerol and a nanofiltration dialysate containing sodium chloride. In order to ensure that the nanofiltration membrane is not polluted, before...

Embodiment 2

[0053] A method for separating sodium chloride and glycerin in high-salt glycerin-containing wastewater.

[0054] (1) Complexation

[0055] Alkaline solution and other metal salts are added to the high-salt glycerin-containing wastewater, so that the glycerol contained in the wastewater undergoes a complex reaction with other metal ions under alkaline conditions to form other glycerol metal complexes.

[0056] The concentration of sodium chloride in the high-salt glycerin-containing wastewater is 18%, the concentration of glycerin is 20%, the alkaline solution is sodium carbonate solution, other metal salts are zinc oxide, other metal ions are zinc ions, and other glycerol metal complexes The substance is zinc glycerol.

[0057] (2) Nanofiltration desalination (separation of glycerol and salt)

[0058] The waste water after the complexation treatment in step (1) is desalinated by graded filtration through a nanofiltration membrane to obtain a nanofiltration concentrate conta...

Embodiment 3

[0069] A method for recovering sodium chloride and glycerin in high-salt glycerin-containing wastewater.

[0070] (1) Complexation

[0071] Alkaline solution and metal salts are added to the high-salt glycerol-containing wastewater, so that the glycerol contained in the wastewater undergoes a complex reaction with other metal ions under alkaline conditions to form other glycerol metal complexes.

[0072] The concentration of sodium chloride in the high-salt glycerol-containing wastewater is 30%, the concentration of glycerin is 12%, the alkali solution is sodium bicarbonate solution, other metal salts are ferric chloride, other metal ions are iron ions, and other glycerol metal The complex is iron glycerol.

[0073] (2) Nanofiltration desalination (separation of glycerol and salt)

[0074] The wastewater after the complexation treatment in step (1) is passed through a nanofiltration membrane for graded filtration and desalination to obtain a nanofiltration concentrate contai...

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Abstract

The invention discloses a method for separating sodium chloride from glycerin in high-salinity and high-depth glycerin-containing organic wastewater. The method comprises the steps of complexing, nanofiltrating and desalinating, decomplexing, separating copper hydroxide or other metal hydroxides from glycerin, and nanofiltrating for separating the glycerin. According to the method disclosed by the invention, through complexation, nanofiltration and centrifugal treatment, the separation of sodium chloride and glycerin is realized, so that a glycerin-containing organic phase does not contain inorganic salts, and thus the feasibility of follow-up evaporation and concentration treatment and fractionated treatment is ensured, and a basis established for the follow-up treatment and recycling of sodium chloride and glycerin.

Description

technical field [0001] The invention relates to the field of water pollution treatment of environmental engineering, in particular to the combined treatment process of complexation, nanofiltration, centrifugation and other methods to separate sodium chloride and glycerin from high-salt glycerin-containing wastewater. Background technique [0002] With the development of industry, the discharge of organic wastewater is increasing day by day. It is of great significance to treat organic wastewater so that it can be discharged up to the standard or recycled. In industrial production such as soap making industry, epichlorohydrin production, biodiesel production, glycerin production, etc., a large amount of organic wastewater with high salt and a certain concentration of glycerin will be produced. The concentration of sodium chloride is about 5-30%, and the content of glycerin About 2~20%, COD Cr About 20000~350000mg / L. The characteristics of high salt make it difficult to use ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C01D3/04
Inventor 张世文王峰江中央林建龙
Owner BOYING XIAMEN SCI & TECH