NOVELTY - The integrated method involves recovering hydrogen and carbon monoxide from reactor in the form of hot raw synthesis gas, and passing hot raw synthesis gas to steam generating heat exchanger (50) to cool the hot raw synthesis gas and produce steam. The steam is recovered from heat exchanger and introduced into a turbine (60) to produce electricity. The cooled synthesis gas is recovered. The excess slag material is recovered from membrane wall gasification reactor (40) and recycled to inlet (32) of membrane wall gasification reactor to increase content of solid ash-forming materials.    USE - Integrated method for gasification of heavy residue bottoms recovered from slurry hydrocracking process to produce synthesis gas.    ADVANTAGE - The fluid nature of catalyst allows for on-line catalyst replacement of small portion of the bed which results in high net bed activity. The moving bed reactor combines the advantage of plug flow in fixed bed operation and relatively easy catalyst replacement of ebullated bed technology. Suppresses coke formation and improves yields by controlling the ratio of lower polarity aromatics-to-asphaltenes in the reactor. The build-up of layer of solidified mineral ash slag on the wall acts as additional protective surface and insulator to minimize or reduce refractory degradation and heat losses through the wall of membrane wall gasifier. Ensures short start-up/shut down times, lower maintenance costs than the refractory type reactor, and capability of gasifying feedstocks with high ash content, thus providing greater flexibility in treating wider range of coals, petcoke, coal/petcoke blends, biomass co-feed, and liquid feedstocks.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of the process for gasification of a feedstream having the heavy residue bottoms and solid catalyst particles from a slurry hydrocracking process.    Slurry hydrocracking zone (20)    Inlet (32)    Membrane wall gasification reactor (40)    Heat exchanger (50)    Turbine (60)