초록 ▼

Carbon dioxide is removed from a raw gas containing hydrogen, carbon dioxide, and intermediate boiling gas, e.g. nitrogen, to give a gas suitable for use as a synthesis gas by a wet carbon dioxide removal process, and the resultant carbon dioxide depleted gas is subjected to pressure swing adsorptio

Carbon dioxide is removed from a raw gas containing hydrogen, carbon dioxide, and intermediate boiling gas, e.g. nitrogen, to give a gas suitable for use as a synthesis gas by a wet carbon dioxide removal process, and the resultant carbon dioxide depleted gas is subjected to pressure swing adsorption (PSA) to remove some, or all, of the intermediate boiling gas and the bulk of any residual carbon dioxide. The PSA waste gas is used to strip the absorbent liquid in the regeneration of the latter in the wet carbon dioxide removal process. The process is of particular utility in the manufacture of ammonia synthesis gas from a raw gas containing an excess of nitrogen, particularly as prepared by primary/secondary reforming/shift of a carbonaceous feedstock with partial bypass of the primary reforming stage.

대표청구항 ▼

A process for producing a hydrogen-containing gas stream from a raw gas stream comprising hydrogen, carbon dioxide, and other gas of intermediate boiling point wherein carbon dioxide is removed from the raw gas stream in a wet carbon dioxide removal stage wherein, in at least one absorption step, ca

A process for producing a hydrogen-containing gas stream from a raw gas stream comprising hydrogen, carbon dioxide, and other gas of intermediate boiling point wherein carbon dioxide is removed from the raw gas stream in a wet carbon dioxide removal stage wherein, in at least one absorption step, carbon dioxide is absorbed from the raw gas into an absorbent liquid to give a carbon dioxide-loaded absorbent liquid which is then passed to at least one regeneration step wherein absorbed carbon dioxide is separated from the carbon dioxide-loaded absorbent liquid thereby regenerating said absorbent liquid which is returned to said at least one absorption step, characterised by: (a) removing at least part of said other gas by a pressure swing adsorption process whereby to produce the required hydrogen-containing gas stream and waste gas, and (b) in at least one regeneration step, contacting the carbon dioxide-loaded absorbent liquid with at least part of said waste gas so that the latter strips carbon dioxide from said carbon dioxide-loaded absorbent liquid to give the regenerated absorbent liquid.