초록 ▼

A process for treating solid particles (66) of a raw carbonaceous fuel (62) such as coal having an original sulfur content comprises producing (at 68) a slurry (74) of a quantity of the raw fuel particles and a liquid medium (70) comprising water, at least one alkali metal compound including a subst

A process for treating solid particles (66) of a raw carbonaceous fuel (62) such as coal having an original sulfur content comprises producing (at 68) a slurry (74) of a quantity of the raw fuel particles and a liquid medium (70) comprising water, at least one alkali metal compound including a substantial amount of sodium or potassium sulfide or polysulfide or a combination thereof, and a catalytic agent (72) comprising calcium or magnesium oxide or carbonate, or dolomite. The slurry is subjected (in 78) for an effective period of time to elevated temperature and pressure effective with the alkali metal compounds and water to cause the medium to penetrate the microscopic structure of the particles and to chemically and physically incorporate a substantial amount of the catalytic agent into the structure. The readily separable medium is separated (at 84) from the fuel particles and the particles are washed (at 84,106) to produce a particulate fuel product (88,110) containing the incorporated catalytic agent. A substantial portion (90,94) of the separated medium is added (at 70) to the slurry produced as above. A sufficient quantity of the catalytic agent is added (at 72) to the medium or the slurry to replace the catalytic agent removed from the slurry with the particulate fuel product. More raw fuel particles (66) are added to the medium or the slurry. The foregoing steps are carried out continually with a multiplicity of new additions of the raw fuel particles and with a multiplicity of reuses of the separated medium to produce fuel product particles (88,110) containing a quantity of sulfur that is not less than the original sulfur content, in addition to the catalytic agent.

대표청구항 ▼

A process for treating solid particles of a raw carbonaceous fuel of the coal or coke type having an original sulfur content, comprising (a) producing a slurry of a quantity of the raw fuel particles and a liquid medium comprising water, at least one alkali metal compound including a substantial amo

A process for treating solid particles of a raw carbonaceous fuel of the coal or coke type having an original sulfur content, comprising (a) producing a slurry of a quantity of the raw fuel particles and a liquid medium comprising water, at least one alkali metal compound including a substantial amount of sodium or potassium sulfide or polysulfide or a combination thereof, and a chemical agent comprising calcium or magnesium oxide or carbonate, or dolomite, (b) subjecting the slurry for an effective period of time to elevated temperature and pressure effective with the alkali metal compounds and water to cause the medium to penetrate the microscopic structure of the particles and to chemically and physically incorporate a substantial amount of the chemical agent into the structure, (c) separating the readily separable medium from the fuel particles and washing the particles to remove most of the alkali metal therefrom while producing a particulate fuel product containing a substantial amount of the chemical agent therein, (d) adding most of the separated medium to the slurry produced in step (a), (e) adding to the medium or the slurry a sufficient quantity of the chemical agent to replace the chemical agent removed from the slurry with the particulate fuel product, (f) adding more raw fuel particles to the medium or the slurry, and (g) continuing to carry out steps (b-f) with a multiplicity of new additions of the raw fuel particles and with a multiplicity of reuses of the separated medium to produce fuel product particles containing a quantity of sulfur that is not substantially less than the original sulfur content, in addition to the chemical agent.