Recovery of sodium thiocyanate

Details Recovery of sodium thiocyanate Recovery of sodium thiocyanate

1974-09-10

1976-06-22

Thomas, Earl C.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Carbon dioxide or hydrogen sulfide component

423223, 423229, 423355, 423366, 423428, 423437, 423563, 210 21, B01D 5334, C01C 320

Patent

active

039652432

ABSTRACT:
A process is described whereby accumulated impurities, consisting mainly of sodium tiocyanate are continuously removed from scrubbing liquors used for removal of hydrogen sulphide from fuel gases and the liquors thereby regenerated and re-used in the hydrogen sulphide scrubbing operation. The thiocyanate is removed by contacting the used scrubbing liquor with an organic solvent, e.g. n-butanol, separating the thiocyanate-bearing solvent from the scrubbing liquor, re-using the treated scrubbing liquor, recovering the thiocyanate from the solvent and re-using the solvent. The extracted sodium thiocyanate can be converted to pure, saleable chemicals or converted to an alkali which can be re-used in the absorbing liquors, thereby producing a completely closed system with no effluent.

REFERENCES:
patent: 1570047 (1926-01-01), Darrin
patent: 2386985 (1945-10-01), Shaw
patent: 2621108 (1952-12-01), Hill et al.
patent: 3652203 (1972-03-01), Nakamura et al.

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