TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Process: The chemical conversion step comprises: a carbon monoxide-shift conversion step, or a methanation or reforming step; and partial oxidation or combustion. The first fuel gas feed stream (10) is produced by the gasification of a carbonaceous material at a pressure of 10-150 bar. The first fuel gas stream (10) is first passed through a membrane separation unit containing a membrane selectively permeable to hydrogen, and the separated hydrogen (H) permeating across the membrane is either used directly at a pressure lower than its partial pressure in the first fuel gas, or is accepted into a counter-currently flowing carrier gas stream (122, 132, 66). The hydrogen (H) separated from the first fuel gas stream (10) is reacted with any residual carbon oxide in the product gas stream (50). The products of the chemical conversion step (20) are chilled to not lower than -56 degrees C, preferably -20 degrees C to -30 degrees C. The first fuel gas (10) is first passed through a membrane separation unit containing a membrane selectively permeable to hydrogen, and at least part of the hydrogen permeating across the membrane is accepted into a counter-currently flowing carrier gas stream (66) to produce a hydrogen rich gas (60) which is combusted in a power generation unit. In the process: at least part of the reactant stream (74) is derived from pressurized air (72) extracted from the gas turbine compressor of an open or combined cycle power generation unit; at least part of the product gas stream (58) is sent to an open or closed cycle power generation unit where it is mixed with gas turbine compressor delivery air and used in the gas turbine combustors; or at least part of the product gas stream (58) is first expanded, with or without preheating, for power recovery and then sent to an open or closed cycle power generation unit where it is mixed with gas turbine compressor delivery air and used in the gas turbine combustors. The process further comprises a single stage or multiple stage expansion-compression refrigeration plant that provides at least part of the chilling during step (c), where at least part of the cold in the condensed liquid (34, 212) is used to chill a refrigerant stream used in the refrigeration plant prior to expansion in at least one stage of the refrigeration plant. Preferred Components: The reactant stream (40) comprises steam. The reactant stream (40, 74) is steam, air, oxygen enriched air or high purity oxygen. The carrier gas stream (122) is by-product nitrogen stream from an air separation unit. The carrier gas stream is derived from the product gas stream (50, 58). The first and/or second stage contactor comprises a counter current flow contacting column. The contacting column comprises plates or mass transfer packing elements. The solvent is water-based, where the first stage contactor also acts as a gas saturator by means of which steam is added to the gas (10, 120, 16, 140, 72) passing through the first stage contactor. The carrier gas stream (66) comprises part of the product gas stream (58). The first fuel gas stream (10) has: a carbon monoxide content of 30-70 (preferably 40-60) mole% on a dry basis; and CO2 content of 1-20 (preferably 1-3) mole% on a dry basis. EXAMPLE - No suitable example given.