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
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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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