Method for recovering sodium chloride and glycerin from glycerin-containing high-salinity organic wastewater
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A technology of organic waste water and recovery methods, applied in chemical instruments and methods, alkali metal chlorides, water pollutants, etc., can solve problems such as waste of resources, pollution of the environment, and non-recycling
Inactive Publication Date: 2015-01-21
BOYING XIAMEN SCI & TECH
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For a long time, most of the high-salt glycerol-containing wastewater such as epoxy resin production wastewater in my country has always been in a state of excessive dischar
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Embodiment 1
[0038] Sodium chloride and glycerin were used to prepare a solution with a certain concentration to simulate wastewater. The quality of wastewater is shown in Table 1.
[0039] Table 1 Water quality of simulated wastewater
[0040] name
COD (ppm)
Chloride ion (ppm)
Glycerin (%)
Sodium chloride(%)
simulated wastewater
60908
121380
10.0
20.0
[0041] (1) Adsorption
[0042] The contents of sodium chloride and glycerin in the simulated waste water are 20% and 10% respectively. After adsorption by macroporous resin, the contents of sodium chloride and glycerin in the raffinate are 19.2% and 0.4% respectively, which shows that most of the glycerin adsorption On the macroporous resin, the separation of glycerin and sodium chloride is realized.
[0043] (2) Evaporation and concentration
[0044] The sodium chloride-containing effluent obtained by the adsorption in the step (1) flows into the evaporator through a pipeline, and...
Embodiment 2
[0063] The raw water quality of petrochemical wastewater in a chemical plant is shown in Table 4.
[0064] Table 4 Experimental results of petrochemical wastewater
[0065]
[0066] (1) Adsorption
[0067] The contents of sodium chloride, glycerin, GLD, 2,3-DCH, and MCH in the raw water of petrochemical wastewater are 21.2%, 9.47%, 0.04%, 0.012%, and 0.01%, respectively. The contents of sodium, glycerin, GLD, 2,3-DCH, and MCH are 20.1%, 0.25%, 0.01%, 0.003%, and 0.002%, respectively, which shows that most of the organic substances such as glycerin, GLD, 2,3-DCH, and MCH Adsorbed on the macroporous resin to realize the separation of organic matter and sodium chloride.
[0068] (2) Evaporation and concentration
[0069] The sodium chloride-containing effluent obtained by the adsorption in the step (1) flows into the evaporator through a pipeline, and the sodium chloride-containing effluent is evaporated and concentrated to obtain a sodium chloride concentrate.
[0070] Th...
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Abstract
The invention discloses a method for recovering sodium chloride and glycerin in glycerin-containing high-salinity organic wastewater, which relates to the treatment of organic wastewater. The method comprises the following steps that: 1) the organic wastewater passes through macroporous resin, so that glycerin molecules in the wastewater are adsorbed, and macroporous resin with the glycerin molecules and sodium chloride-containing effluent are obtained; 2) the sodium chloride-containing effluent obtained in the step 1) is evaporated and concentrated in an evaporator, thus obtaining a sodium chloride concentrated solution; 3) the sodium chloride concentrated solution obtained in the step 2) is crystallized, thus obtaining solid sodium chloride and mother liquor left after crystallization and filtration; 4) after being diluted and biochemically treated, the mother liquor is discharged; 5) the macroporous resin treated in the step 1) is washed by using a desorption agent so as to elute the glycerin adsorbed on the macroporous resin to obtain glycerin-containing eluant and the macroporous resin subjected to eluting is put into the step 1) for cyclical utilization; 6) the glycerin-containing eluant obtained after desorption in the step 5) is distilled so as to obtain the desorption agent and crude glycerin, and the desorption agent is put into the step 5) for cyclical utilization; and 7) the crude glycerin obtained in the step 6) is fractionated, thus obtain a finished glycerin product and distillation residue liquid.
Description
technical field [0001] The invention relates to organic wastewater treatment, in particular to a recovery method for sodium chloride and glycerin in high-salt glycerol-containing 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, and glycerin production, a large amount of organic wastewater with high salt content and a certain concentration of glycerin will be produced. The concentration of sodium chloride is about 5% to 25%, and glycerin Content about 3% ~ 15%, COD Cr About 20000~350000mg / L. The characteristics of high salt make it difficult to use biological technology for treatment, and it is also difficult to use membrane separation, electrodialysis separati...
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