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 ha

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0023] Example 1:

[0024] (1) Take a sample of ADA desulfurization waste liquid for analysis. The analysis results are: 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 and decolorize for 30 minutes, then filter out the activated carbon, and wash the activated carbon into the mother liquor, collecting a total of 1002 g of mother liquor;

[0025] (2) Carry out the vacuum evaporation and concentration operation of the collected mother liquor, evaporate to remove the moisture in the mother liquor, and then cool to about 60°C to obtain 524g of the first concentrated liquid;

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

Example Embodiment

[0028] Example 2:

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

[0030] (2) Carry out the vacuum evaporation and concentration operation of the collected mother liquor, evaporate and remove the moisture in the mother liquor, and then cool to about 60°C to obtain 584g of the concentrated material liquid once;

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

Example Embodiment

[0033] Example 3:

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

[0035] (2) The collected material liquid is subjected to a vacuum evaporation and concentration operation, and the water in the mother liquor is removed by evaporation, and then cooled to about 60°C to obtain 591g of the material liquid after concentration;

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

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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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