Process for the selective removal of hydrogen sulphide and carbonyl sulfide from light hydrocarbon gases containing carbon dioxide

Patent · Tue Jun 07 00:00:00 EDT 1988

OSTI ID:6956592

Bush, W V

A process for the selective removal of H/sub 2/S and COS from a gas containing light hydrocarbons, H/sub 2/S, COS and CO/sub 2/, is described which comprises in a one step absorption, at treatment conditions, contacting the gas stream with a solvent stream consisting essentially of: (i) water, (ii) a bridgehead amine comprising a bicyclo tertiary amine or a bicyclo amidine to selectively hydrolyze the COS to H/sub 2/S and CO/sub 2/, (iii) a tertiary amine to selectively absorb the H/sub 2/S and to selectively exclude from absorption the CO/sub 2/ in the gas stream and the CO/sub 2/ produced by the hydrolysis of the COS, and (iv) a physical solvent acceptable for COS absorption wherein two streams are formed comprising: (1) a light hydrocarbon and CO/sub 2/-containing stream having 1 ppm to about 200 ppm H/sub 2/S and having 1 ppm COS to about 10 ppm COS and (2) a solvent stream rich in H/sub 2/S, water, tertiary amine and the bridgehead amine.

• Assignee: Shell Oil Co., Houston, TX
• Patent Number(s): US 4749555
• OSTI ID: 6956592
• Resource Relation: Patent File Date: Filed date 2 Oct 1986
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
HYDROCARBONS
DESULFURIZATION
HYDROGEN SULFIDES
REMOVAL
ADSORPTION
AMINES
CARBON DIOXIDE
CARBONYL RADICALS
HYDROLYSIS
PROCESS SOLUTIONS
SEPARATION PROCESSES
SOLVENTS
SULFIDES
WATER
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
DECOMPOSITION
DISPERSIONS
HYDROGEN COMPOUNDS
LYSIS
MIXTURES
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
RADICALS
SOLUTIONS
SOLVOLYSIS
SORPTION
SULFUR COMPOUNDS
400201* - Chemical & Physicochemical Properties