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Method for extracting sodium thiocyanate from ADA desulfurization waste liquid

A technology of desulfurization waste liquid and sodium thiocyanate, which is applied in the direction of thiocyanate, etc., can solve the problems of high ethanol moisture content, large investment in ethanol recovery equipment, and high ethanol content in waste residue, so as to reduce the investment in ethanol recovery equipment, Reduced production costs and high extraction efficiency

Inactive Publication Date: 2018-08-17
江苏燎原环保科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (1) The ADA desulfurization waste liquid needs to be evaporated before the treatment of the ADA desulfurization waste liquid, and the mixed salt is extracted by centrifugal separation, which has high energy consumption, many safety hazards, and the waste residue contains more ethanol;
[0006] (2) The requirements for the moisture content of ethanol are high, and absolute ethanol is required, the cost of use is high, and the investment in ethanol recovery equipment is large

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) ADA desulfurization waste liquid samples were taken for analysis, and the analysis results were: sodium thiocyanate 14.5%; sodium thiosulfate 6.2%; sodium sulfate 2.7%. First, add 3 g of activated carbon to 1000 g of desulfurization waste liquid under stirring at 40 ° C, stir for 30 minutes to decolorize, then filter out the activated carbon, wash the activated carbon and incorporate it into the mother liquor, collecting a total of 1002 g of the mother liquor;

[0025] (2) The collected mother liquor was evaporated and concentrated under reduced pressure to remove the water in the mother liquor, and then cooled to about 60°C to obtain 524g of the concentrated feed liquid once;

[0026] (3) Slowly add 160g of ethanol to the concentrated material under stirring, and cool down while adding, stir and cool for 30 minutes after the addition, and finally cool down to about 40°C, then filter to remove the precipitated sodium thiosulfate and Sodium sulfate, rinse filter cake...

Embodiment 2

[0029] (1) ADA desulfurization waste liquid samples were taken for analysis, and the analysis results were: sodium thiocyanate 14.5%; sodium thiosulfate 6.2%; sodium sulfate 2.7%. First, add 3 g of activated carbon to 1000 g of desulfurization waste liquid under stirring at 40-60 ° C, stir for 30 minutes to decolorize, then filter out the activated carbon, wash the activated carbon and incorporate it into the mother liquor, collect a total of 1001 g of the mother liquor; combine with the previous mother liquor to obtain a total of 1082 g of the feed liquor;

[0030] (2) The collected mother liquor was evaporated and concentrated under reduced pressure to remove the moisture in the mother liquor, and then cooled to about 60°C to obtain 584g of the concentrated feed liquid once;

[0031] (3) Slowly add 205g of ethanol to the concentrated material under stirring, then cool down after adding, stir and cool for 30min after the addition, and finally cool down to about 40°C, then filt...

Embodiment 3

[0034] (1) ADA desulfurization waste liquid samples were taken for analysis, and the analysis results were: sodium thiocyanate 14.5%; sodium thiosulfate 6.2%; sodium sulfate 2.7%. First, add 4 g of activated carbon to 1000 g of desulfurization waste liquid under stirring at 40-60 ° C, stir for 30 minutes to decolorize, then filter out the activated carbon, wash the activated carbon and incorporate it into the mother liquor, collect a total of 1002 g of mother liquor; combine with the previous mother liquor to obtain a total of 1092 g of feed liquor;

[0035] (2) The collected feed liquid was evaporated and concentrated under reduced pressure to remove the water in the mother liquor, and then cooled to about 60°C to obtain 591g of the feed liquid once concentrated;

[0036] (3) Slowly add 210g of ethanol to the concentrated material under stirring, then cool down after adding, stir and cool for 30 minutes after the addition, and finally cool down to about 40°C, then filter to re...

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Abstract

The invention provides a method for extracting sodium thiocyanate from an ADA desulfurization waste liquid, and relates to the technical field of extraction of sodium thiocyanate, wherein the ADA desulfurization waste liquid includes the following steps: (1) directly taking the ADA desulfurization waste liquid, decolorizing, filtering, and collecting mother liquor; (2) carrying out decompression evaporation concentration operation on the collected mother liquor, to obtain a concentrated material solution; (3) adding an ethanol aqueous solution slowly into the concentrated material solution, and cooling down to 35-45 DEG C while stirring; and (4) filtering, collecting a filtrate, carrying out decompression evaporation concentration, carrying out cooling crystallization, and carrying out centrifugal separation to prepare sodium thiocyanate. The technical problems that an ADA desulfurization waste liquid needs to be subjected to high-temperature evaporation and centrifugal separation to extract mixed salts in the earlier stage of the prior art, resulting in high energy consumption and high separation equipment requirements are effectively solved, high-efficiency dissolution of thiocyanate by the ethanol aqueous solution system is achieved, and the dissolution amount of impurity salts is guaranteed to reach low level at low temperature, so as to achieve the technical effect of precipitating sodium thiocyanate crystals from the mixed solvent rapidly.

Description

technical field [0001] The invention belongs to the technical field of extracting sodium thiocyanate, in particular to a method for extracting sodium thiocyanate from ADA desulfurization waste liquid. Background technique [0002] Sodium thiocyanate is a valuable chemical raw material, which has very important uses in various sectors of the national economy. It is mainly used as solvent for acrylic fiber spinning, chemical analysis reagent, color film film flushing agent, some plant defoliants and airport road herbicides, also used in pharmaceuticals, printing and dyeing, rubber processing, black nickel plating and the manufacture of artificial mustard oil etc. The industrial production processes mainly include: separation of waste liquid in coke oven gas to sodium thiocyanate, synthesis of sodium thiocyanate with sodium cyanide and sulfur, production of sodium thiocyanate by double decomposition of ammonium thiocyanate and sodium hydroxide . Its synthetic sodium thiocyan...

Claims

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Application Information

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IPC IPC(8): C01C3/20
CPCC01C3/20C01P2006/80
Inventor 邓百策周庆崔健吴蕾许顺龙
Owner 江苏燎原环保科技股份有限公司
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