초록 ▼

A high pressure synthetic gas stream is produced by gasifying coal. Hydrogen sulfide is removed by contacting the high pressure gas stream with a physical solvent, such as an alcohol, in an absorber column. A low temperature is maintained in the absorber column, typically by chilling both the solven

A high pressure synthetic gas stream is produced by gasifying coal. Hydrogen sulfide is removed by contacting the high pressure gas stream with a physical solvent, such as an alcohol, in an absorber column. A low temperature is maintained in the absorber column, typically by chilling both the solvent and the incoming high pressure synthetic gas stream, where a portion of the cooling requirement is supplied by adiabatically expanding the cleaned high pressure gas stream exiting the absorber. Typically, the cleaned high pressure gas stream will be expanded in a turbine expander to provide mechanical energy in addition to cooling capacity. The cleaned synthetic gas is useful as a fuel or chemical feedstock.

대표청구항 ▼

A method for gasifying coal, said method comprising: (a) combining ground coal and oxygen under conditions selected to produce a high pressure synthetic gas stream having a pressure above about 100 psia and containing hydrogen sulfide; (b) cooling the high pressure synthetic gas stream; (c) cooling

A method for gasifying coal, said method comprising: (a) combining ground coal and oxygen under conditions selected to produce a high pressure synthetic gas stream having a pressure above about 100 psia and containing hydrogen sulfide; (b) cooling the high pressure synthetic gas stream; (c) cooling a solvent capable of physically absorbing hydrogen sulfide; (d) contacting the cooled high pressure synthetic gas stream and the cooled solvent stream to remove hydrogen sulfide and thereby to produce a clean gas stream having a hydrogen sulfide content less than that present in the uncleaned high pressure gas stream; (e) expanding the clean synthetic gas stream to produce a cooled synthetic gas stream; and (f) providing at least a portion of the cooling requirement of step (b) or step (c) by heat exchange with the cooled synthetic gas stream produced in step (e).