NOVELTY - Increasing hydrogen content of a raw synthesis gas (10) comprising hydrogen and carbon oxides and containing at least one sulfur compound, involves heating the raw synthesis gas; and passing at least part of the heated raw synthesis gas (50) and steam (12) through a reactor (42) containing a sour shift catalyst (46) to form a shifted gas stream, where the synthesis gas (28) is heated by passing it through several tubes (44) disposed within the catalyst in a direction co-current to the flow of the synthesis gas through the catalyst.    USE - For increasing hydrogen content of raw synthesis gas comprising hydrogen and carbon oxides and containing at least one sulfur compound, to obtain synthesis gas which is useful production of methanol, liquid hydrocarbons and synthetic natural gas (claimed).    ADVANTAGE - The process maximizes hydrogen yield with minimal CO and CO2 content.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) production of methanol involving forming synthesis gas having stoichiometry ratio (R=(H2-CO2)/(CO+CO2)) of 1.4-2.5; and passing the synthesis gas at an elevated temperature and pressure through at least one bed of methanol synthesis catalyst;    (2) synthesis of liquid hydrocarbons involving forming synthesis gas having the stoichiometry ratio of 1.4-2.5; optionally adjusting the hydrogen to carbon monoxide ratio such that the synthesis gas has hydrogen:carbon monoxide ratio of 1.5-2.5:1; and passing the synthesis gas at an elevated temperature and pressure over cobalt- or iron-based Fischer-Tropsch catalyst in a vessel;    (3) production of synthetic natural gas involving forming synthesis gas having the stoichiometry ratio of 2.8-3.3; and passing the synthesis gas at over supported Ni catalyst in at least one reactor; and    (4) shift reactor containing a bed of water gas shift catalyst having several cooling tubes disposed in it, where the reactor and tubes are configured such that synthesis gas is optionally passed through the tubes in one direction and then passed through the catalyst in the same direction.    DESCRIPTION OF DRAWING(S) - The figure shows a process in which the synthesis gas mixture is heated in tubes disposed within the bed of sour shift catalyst and then passed through the catalyst in a co-current arrangement.    Raw synthesis gas (10)    Stream (12)    Heat exchanger (20, 24, 26)    Product synthesis gas (28)    Reactor by-pass stream (30)    Header arrangement (40)    Cylindrical sour shift reactor (42)    Tubes (44)    Sour shift catalyst (46)    Heated raw synthesis gas (50)    Lines (52, 54)    Catalyst by-pass stream (56)