Removal of hydrogen cyanide from other acid gases - present in gas washing liquors by reacting with alkaline poly-sulphide soln, to convert the cyanide to thiocyanate salts

HCN and other acid gases, e.g. CO2, H2S and COS are physically washed from gas streams and the charged wash liquor reacted with aq. alkaline polysulphide soln. to convert the HCN to a thiocyanate salt which is separated from the wash liquor. Pref. most of the other acid gases are separated from the...

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Main Authors WEBER, GERHARD. ER.NAT., 8000 MUENCHEN, KARWAT, HEINZ. ER.NAT., 8023 PULLACH
Format Patent
LanguageEnglish
German
Published 12.06.1974
Edition1
Subjects
CHEMISTRY
FUELS
LUBRICANTS
METALLURGY
PEAT
PERFORMING OPERATIONS
PETROLEUM, GAS OR COKE INDUSTRIES
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLEGASES CONTAINING CARBON MONOXIDE
SEPARATION
TECHNICAL GASES CONTAINING CARBON MONOXIDE
TRANSPORTING
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Summary:HCN and other acid gases, e.g. CO2, H2S and COS are physically washed from gas streams and the charged wash liquor reacted with aq. alkaline polysulphide soln. to convert the HCN to a thiocyanate salt which is separated from the wash liquor. Pref. most of the other acid gases are separated from the wash liquor e.g. by pressure release, before adding the polysulphide. Methanol is the pref. was liquid and is separated from the thiocyanate soln. by distillation. The process is suitable for purifying coke oven, combustion and distillation gases, and natural gas. The need for a separate alkaline pre-wash of the whole gas stream to remove HCN, and water or air pollution problems arising from its corrosivity and extreme toxicity are eliminated.
Bibliography:Application Number: DE19722260247