C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
48/46
C01B 3/00 (2006.01) B01D 53/14 (2006.01) C10J 3/00 (2006.01) C10K 1/06 (2006.01) C10K 1/16 (2006.01)
Patent
CA 1059765
ABSTRACT OF THE DISCLOSURE: A process for purifying-raw gases produced by gasifica- tion of solid or liquid fossile fuels, by treatment with water vapor and oxygen under superatmospheric pressure, in order to remove therefrom catalyst-deteriorating impurities, such as mono- or polyunsaturated hydrocarbons, mercaptans, HCN, HCl, H2S, CS2, COS, and NH3, and to desulfurize the gases, while producing an exhaust gas which is rich in H2S, which process comprises indirectly cooling to ambient temperature the raw gas, which is available at a temperature of 150-170°C, separating and removing therefrom the condensible hydrocarbons, subsequently scrubbing the gas with water to remove ammonia in a first scrubbing stage, in which the water rate is controlled to be just sufficient to remove the ammonia, then scrubbing the gas with a high-boiling organic solvent, which is miscible with water, adding sulfur to that solvent and using it in a second scrubbing stage, in which the solvent rate is controlled in dependence on the solubility of the methylmercaptan, which is to be removed, in the solvent, subsequently adding to the same solvent a soluble activator having a boiling point which is approximatively as high as or higher than that of the boiling organic solvent, adjusting the activator content and using the so adjusted solvent in a third scrubbing stage, in which the water content of the solvent is kept at 5-30 mole percent H2O and in which H2S and COS are entirely and selectively removed from the gas, the scrubbing solvents from the second and third scrubbing stages being separately regenerated and recycled to the second and third scrubbing stages for re-use. The resulting pure gas may be directly used for various chemical syntheses, such as ammonia, methane, methanol, oxosyntheses or Fisher Tropsch syntheses.
231109
Bratzler Karl
Doerges Alexander
Hochgesand Gerhard
Kriebel Manfred
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