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Method for recovering sodium chloride and glycerol from high-salt glycerol-containing high-depth organic wastewater

A technology of organic waste water and recovery methods, applied in the preparation of organic compounds, organic chemistry, chemical instruments and methods, etc., can solve the problems of waste of resources, unrecycling, environmental pollution, etc., and achieve the effect of ensuring feasibility

Inactive Publication Date: 2014-12-24
BOYING XIAMEN SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For a long time, most of the high-salt glycerin-containing wastewater such as epoxy resin production wastewater in my country has been discharged beyond the standard. The high-concentration sodium chloride and glycerin in it have not been recycled, which not only pollutes the environment, but also causes great damage to resources. waste

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  • Method for recovering sodium chloride and glycerol from high-salt glycerol-containing high-depth organic wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Recovery method of sodium chloride and glycerin in high-salt glycerin-containing high-depth organic wastewater:

[0052] (1) Complexation

[0053] 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.

[0054] 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.

[0055] (2) Nanofiltration desalination (separation of glycerol and salt)

[0056] 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 po...

Embodiment 2

[0079] A recovery method for sodium chloride and glycerin in high-salt glycerin-containing high-depth organic wastewater.

[0080] (1) Complexation

[0081] 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.

[0082] 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.

[0083] (2) Nanofiltration desalination (separation of glycerol and salt)

[0084] The waste water after the complexation treatment in step (1) is desalinated by graded filtration through a nanofiltration membrane to obtain a nanofiltration ...

Embodiment 3

[0107] A recovery method for sodium chloride and glycerin in high-salt glycerin-containing high-depth organic wastewater.

[0108] (1) Complexation

[0109] 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.

[0110] 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.

[0111] (2) Nanofiltration desalination (separation of glycerol and salt)

[0112] The wastewater after the complexation treatment in step (1) is passed through a nanofiltration membrane for graded filtration and desalination to obtain a nanofiltration c...

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Abstract

The invention discloses a method for recovering sodium chloride and glycerol from high-salt glycerol-containing high-depth organic wastewater. The method comprises the steps of complexing, carrying out nanofiltration to desalt, evaporating to concentrate, crystallizing, decomplexing, separating glycerol from copper hydroxide or other metal hydroxides, carrying out nanofiltration to separate glycerol, carrying out reverse osmosis to concentrate glycerol, distilling to concentrate glycerol and fractionating. The salinity of the wastewater treated by the method is lowered, and a biochemical treatment process is adopted after the treated wastewater is diluted, so as to enable the quality of outlet water to reach the standards; meanwhile, sodium chloride and glycerol are effectively recovered, wherein the purity of finished product glycerol reaches 95%.

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, decomplexation, centrifugation, adsorption, evaporation concentration, crystallization, fractionation and other methods to recover chlorine in high-salt glycerol-containing high-depth organic wastewater. Sodium Chloride and Glycerin. 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...

Claims

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Application Information

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IPC IPC(8): C02F9/10C07C29/74C07C29/00C07C31/22C01D3/04
CPCY02A20/131
Inventor 张世文王峰许雅玲林建龙
Owner BOYING XIAMEN SCI & TECH
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