NOVELTY - A hydrocarbon is synthesized by generating a synthesis gas stream, containing hydrogen (H2) and carbon monoxide (CO) at a mole ratio of greater than 2:1, in a pressure swing reformer; separating portion of hydrogen from the synthesis gas stream to provide a synthesis gas stream containing H2 and CO at a mole ratio of 2:1; and introducing the synthesis gas stream into a hydrocarbon synthesis reactor for conversion to liquid products.    USE - For synthesizing hydrocarbon, e.g. methane, petroleum gases, petroleum distillates, kerosene, jet fuel, fuel oil, heating oil, diesel fuel and gas oil, or gasoline to produce liquid hydrocarbons.    ADVANTAGE - The reforming step is carried out at higher pressures than the regeneration step, and the pressure swing is enabled because of the large volumetric heat capacity difference between the solid and the gas, thus lowering the process cost.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for synthesis gas and hydrocarbon conversion process comprising introducing a feed stream comprising a hydrocarbon and steam through a first end of a first zone containing bed packing materials and a steam reforming catalyst to produce a product synthesis gas stream at a first pressure having a ratio of H2 and CO greater than 2:1; passing portion of the product to a second zone containing bed packing materials and transferring sensible heat from the product to the packing materials; removing all of the product from the second zone; introducing an oxygen-containing gas into the second end of the second zone; contacting the oxygen-containing gas with a fuel and combusting the gas and fuel within the zones at a second pressure lower than the first pressure to re-heat the first zone to reforming temperatures and to create a flue gas that exits through the first end of the first zone; separating hydrogen from the recovered product to produce a synthesis gas stream having a H2 and CO ratio of 2:1; and introducing the synthesis gas into a hydrocarbon synthesis reactor for conversion to liquid products.    DESCRIPTION OF DRAWING(S) - The figure is a schematic view of basic reforming and regeneration steps of pressure swing reforming.    Reforming bed (1)    Second end (5, 9)    Recuperating zone (7)    First end (11)    Temperature profile (23)    Temperature gradient (24)