Gas purification liquors
AssigneeBritish Gas Corporation
InventorsThomas Nicklin, Frederick Farrington
Life of this patent
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Abstract
Thiosulphate ions present in gas purification liquors, particularly those employed for removing H.sub.2 S by washing with aqueous alkaline solutions of vanadium compounds and anthraquinone disulphonic acids, are decomposed to sulphide and hydroxyl ions by exposing the liquor to a hydrogen rich gas at elevated temperature e.g., 650.degree. C. The liquor may be evaporated and the solid residue subjected to decomposition. Any thiocyanate ions are hydrolyzed; it being necessary to mix steam with the hydrogen rich gas if a solid residue is being decomposed.
Claims16
A process for the decomposition of thiosulphate ions present in aqueous gas purification liquors employed for removing hydrogen sulphide from fuel gases or liquid hydrocarbons by means of a wash liquor containing vanadium compounds and sodium anthraquinone disulphonate, concentrating and cooling said liquors so as to crystallize out the sodium anthraquinone disulphonate, recovering the sodium anthraquinone disulphonate and exposing the resulting liquor or a solid residue derived therefrom by evaporation to a hydrogen-rich gas at a temperature of 300.degree. to 800.degree. C. in the absence of a catalyst.
Dependencies are inferred from the claim text.