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Method for recycling glycerol in organic wastewater with high salt content

A technology of organic waste water and recovery method, applied in the preparation of organic compounds, organic chemistry, chemical instruments and methods, etc., can solve the problems of waste of resources, pollute the environment, and have not been recycled, and achieve the effect of ensuring feasibility

Inactive Publication Date: 2015-02-04
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 recycling glycerol in organic wastewater with high salt content

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Recover sodium chloride and glycerin from wastewater containing 30% sodium chloride and 2% glycerol.

[0046] (1) Primary complexation

[0047] Sodium hydroxide solution and copper sulfate solution are added to high-salt organic wastewater, so that glycerol contained in the wastewater undergoes a complex reaction with copper ions under alkaline conditions to form a negative divalent glycerol copper complex.

[0048] (2) Primary nanofiltration desalination

[0049] Step (1) The waste water after the complexation treatment is desalted by graded filtration through the nanofiltration membrane to obtain the nanofiltration concentrate containing glycerin copper and the nanofiltration dialysate containing sodium chloride. The dialysate contains 19% sodium chloride, and the menstrual fluid Phase chromatographic analysis showed that the glycerin content was 350mg / L. In order to ensure that the nanofiltration membrane is not polluted, before nanofiltration desalination, an ultraf...

Embodiment 2

[0065] Recover sodium chloride and glycerin from waste water containing 18% sodium chloride and 20% glycerin.

[0066] (1) Primary complexation

[0067] Add alkali hydroxide and copper hydroxide newly made from copper sulfate into the high-salt organic wastewater, and keep stirring, so that the glycerol contained in the wastewater undergoes a complex reaction with copper hydroxide under alkaline conditions to form a negative divalent Glycerol Copper Complex.

[0068] (2) Primary nanofiltration desalination

[0069] The waste water after the primary 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 15% sodium chloride and 8% glycerin. In order to ensure that the nanofiltration membrane is not polluted, before nanofiltration desalination, a microfiltration device is added to remove large particles of impurities to obtai...

Embodiment 3

[0098] Recover sodium chloride and glycerin from waste water containing 22% sodium chloride and 12% glycerin.

[0099] (1) Primary complexation

[0100] Sodium hydroxide solution and copper sulfate solution are added to high-salt organic wastewater, so that the glycerin contained in the wastewater undergoes a complex reaction with copper ions under alkaline conditions to form a glycerol-copper complex.

[0101] (2) One-stage nanofiltration desalination (separation of copper glycerol and salt)

[0102] 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 17% sodium chloride and 4% glycerin.

[0103] The above-mentioned nanofiltration membrane adopts a nanofiltration membrane with a rejection rate of 98% for magnesium sulfate. The nanofiltration membrane is any one of grades 1-4, and the membrane m...

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Abstract

The invention discloses a method for recycling glycerol in organic wastewater with high salt content. The method includes complexation, nanofiltration and desalination, evaporation and concentration, crystallization, decomplexation, copper hydroxide and glycerol separation, distillation, and fractionation, wherein the complexation can adopt first-level complexation, second-level complexation, third-level complexation or fourth-level complexation, according to the number of complexation levels, first-level nanofiltration and desalination, second-level nanofiltration and desalination, third-level nanofiltration and desalination or fourth-level nanofiltration and desalination are correspondingly adopted, and finally the glycerol content in a nanofiltration dialysate is less than 0.5%. The wastewater is treated by the method, the glycerol is effectively recycled, the purity of the finished product glycerol reach 95%, simultaneously, the salinity is decreased, a biochemical treatment process is adopted after dilution, and the water quality of an effluent is qualified.

Description

technical field [0001] The invention relates to the field of water pollution treatment of environmental engineering, in particular to a combined treatment process of complexation, nanofiltration, adsorption, evaporation concentration, crystallization, fractionation and the like to recover glycerin from high-salt organic 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 d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/22C07C29/74C07C29/80C07C29/88
CPCC01D3/04C07C29/74C07C29/80C07C29/88C07C31/225
Inventor 张世文王峰江中央林菁许雅玲
Owner BOYING XIAMEN SCI & TECH
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