(US5401282-A)      Hot, clean synthesis gas, reducing gas or fuel gas is produced from a solid carbonaceous fuel contg. halides, alkali metal cpds. S, N and inorganic ash, opt. together with hydrocarbon liquids or gases by (A) burning it with a gas contg. free O2 to produce a hot, crude gas stream consisting of H2, CO, CO2, H2O, CH4, NH3, HCl, HF, H2S, COS, N2, Ar and contg. particulate matter, vaporised alkali metal cpds. and molten slag, (B) in a series of operations sepg. slag and particulate matter with cooling of the gas, further cooling by quenching with water, NH3 is catalytically disproportionated to H2 and N2, the gas is further cooled and gaseous halides are removed by addition of alkali metal cpds. followed by cooling and filtering of the gas to remove particulates and (C) the cooled and filtered gas is freed from S by adding an S reactive oxide and the gas is finally cooled and filtered to obtain a clean gas stream at a temp. of at least 540 deg C.    USE/ADVANTAGE -   To produce a gas free from particulates, NH3, halides, alkali metal cpds. and S contg. gases. The gas used as fuel in gas turbines does not contaminate the atmosphere. Used as synthesis gas will not deactivate the synthesis catalyst.    (JP8151582-A)      A partial oxidn. process for the prodn. of synthesis gas, reducing gas or fuel gas comprises reacting a hydrocarbonaceous fuel comprising a solid hydrocarbonaceous fuel opt. with liq. liq. or gaseous hydrocarbon fuel, also contg. halide, alkali metal cpds., S, N and inorganic ash-contg. cpds., by partial oxidn. with a free-oxygen contg. gas in a free-flow vertical refractory-lined partial oxidn. gas generator to produce a hot raw gas stream of temp. 980-1650 deg.C and contg. H2, CO, CO2, H2O, CH4, NH3, HCN, HCl, HF, H2S, COS, N-2, Ar and also contg. particulate matter and vapour phase alkali metal cpds. and molten slag.    The process is characterised by: (a) splitting the hot raw gas stream into two streams (A) and (B), (b) introducing (A) into a gas deslagging zone, removing molten slag and a slipstream of hot raw gas, sepg. molten slag from the slipstream in a gas quenching zone to produce a quenched slag-free raw gas stream G and removing a hot raw gas stream E free from particulate matter and molten slag, (c) quenching (B) in water, sepg. slag and particulate matter and sepg. a clean stream of water-satd. raw gas C, (d) dewatering and demisting (C) to produce a raw gas stream (D) and mixing (E) and (D) to produce a raw gas stream (H) at temp. 930-1260 deg.C, cooling by indirect heat exchange to 820-1010 deg.C and (e) mixing together raw gas streams (G) and (H).    USE -   For prodn. of hot clean synthesis, reducing or fuel gas.    ADVANTAGE -   Gas is free from entrained particulate solids and gaseous impurities including ammonia, halides, vapour phase alkali metal cpds. and S. Does not contaminate the atmos. when combusted as fuel gas in e.g. a gas turbine. Does not deactivate synthesis catalyst during synthesis reaction.    (EP629685-B1)      A partial oxidn. process for the prodn. of synthesis gas, reducing gas or fuel gas comprises reacting a hydrocarbonaceous fuel comprising a solid hydrocarbonaceous fuel opt. with liq. liq. or gaseous hydrocarbon fuel, also contg. halide, alkali metal cpds., S, N and inorganic ash-contg. cpds., by partial oxidn. with a free-oxygen contg. gas in a free-flow vertical refractory-lined partial oxidn. gas generator to produce a hot raw gas stream of temp. 980-1650 deg.C and contg. H2, CO, CO2, H2O, CH4, NH3, HCN, HCl, HF, H2S, COS, N-2, Ar and also contg. particulate matter and vapour phase alkali metal cpds. and molten slag.    The process is characterised by: (a) splitting the hot raw gas stream into two streams (A) and (B), (b) introducing (A) into a gas deslagging zone, removing molten slag and a slipstream of hot raw gas, sepg. molten slag from the slipstream in a gas quenching zone to produce a quenched slag-free raw gas stream G and removing a hot raw gas stream E free from particulate matter and molten slag, (c) quenching (B) in water, sepg. slag and particulate matter and sepg. a clean stream of water-satd. raw gas C, (d) dewatering and demisting (C) to produce a raw gas stream (D) and mixing (E) and (D) to produce a raw gas stream (H) at temp. 930-1260 deg.C, cooling by indirect heat exchange to 820-1010 deg.C and (e) mixing together raw gas streams (G) and (H).    USE -   For prodn. of hot clean synthesis, reducing or fuel gas.    ADVANTAGE -   Gas is free from entrained particulate solids and gaseous impurities including ammonia, halides, vapour phase alkali metal cpds. and S. Does not contaminate the atmos. when combusted as fuel gas in e.g. a gas turbine. Does not deactivate synthesis catalyst during synthesis reaction.