Process for purifying gases from the gasification of fossil fuels

Patent · Tue May 09 04:00:00 EDT 1978

OSTI ID:7072185

Bratzler, K; Doerges, A; Hochgesand, G; Kriebel, M

A process is disclosed for purifying gases produced by the gasification of fossil fuels by a treatment with water vapor and oxygen under superatmospheric pressure. The raw gas produced is treated to remove catalyst-deteriorating impurities such as mono- and polyunsaturated hydrocarbons, mercaptans, HCN, HCl, H/sub 2/S, CS/sub 2/, COS, and NH/sub 3/, and to desulfurize the gas to produce an exhaust gas which is rich in H/sub 2/S. The gas is cooled and scrubbed under superatmospheric pressures and at normal temperatures. The raw gas, at a temperature of 150/sup 0/--170/sup 0/C, is indirectly cooled to ambient temperature. The condensible hydrocarbons are then separated and removed, and the gas is then scrubbed with water to remove ammonia in a first scrubbing stage wherein the rate of water addition is controlled to be just sufficient to remove the ammonia. The gas is then scrubbed with a high-boiling organic solvent which is miscible with water and to which sulfur has been added in a second scrubbing stage in which the rate of solvent addition is controlled in dependence on the solubility of the methyl mercaptan, which is to be removed, in the solvent. The gas is scrubbed with the same solvent in a third scrubbing stage in which the water content of the solvent is kept at 5--30 mol percent H/sub 2/O in which H/sub 2/S and COS are entirely and selectively removed from the gas. Lastly, the scrubbing agents from the second and third scrubbing stages are separately regenerated and recycled to the second and the third scrubbing stages for re-use.

• Assignee: Metallgesellschaft AG
• Patent Number(s): US 4088735
• OSTI ID: 7072185
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010404* -- Coal
Lignite
& Peat-- Gasification
AMMONIA
CARBON COMPOUNDS
CARBON OXYSULFIDE
CARBON SULFIDES
CHALCOGENIDES
COAL GASIFICATION
CRYOGENIC FLUIDS
ELEMENTS
ENERGY SOURCES
FLUIDS
FUEL GAS
FUELS
GAS FUELS
GASES
GASIFICATION
HYDRIDES
HYDROCARBONS
HYDROCHLORIC ACID
HYDROCYANIC ACID
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
INORGANIC ACIDS
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
NONMETALS
ORGANIC COMPOUNDS
ORGANIC SOLVENTS
ORGANIC SULFUR COMPOUNDS
OXYGEN
OXYGEN COMPOUNDS
PURIFICATION
REGENERATION
REMOVAL
SCRUBBING
SOLVENTS
SULFIDES
SULFUR COMPOUNDS
THERMOCHEMICAL PROCESSES
THIOLS
VAPORS
WATER
WATER VAPOR