NOVELTY - Carbonaceous feedstock (A) and optionally aqueous stream are reacted in a syngas generator in presence of oxygen, to produce gas stream (C). The produced gas stream is cooled and separated into hydromethanation gas feed stream and syngas raw product stream. Then, steam and/or heat energy are optionally added to the obtained stream. A carbonaceous feedstock (A1), hydromethanation catalyst, hydromethanation gas feed stream and optionally oxygen-rich gas stream (B1) are added to hydromethanation reactor and reacted, to produce methane-enriched raw product stream.    USE - Process for generating methane-enriched raw product stream and syngas raw product stream from carbonaceous feedstock(s) used for production of pipeline-quality natural gas product and sweetened gas stream for production of methane product stream and hydrogen product stream (all claimed).    ADVANTAGE - The method efficiently generates methane-enriched raw product stream and syngas raw product stream without utilizing oil syngas capacity of syngas generator.    DETAILED DESCRIPTION - A carbonaceous feedstock (A), oxygen-rich gas stream (B), and optionally an aqueous stream comprising water and/or steam are supplied to a syngas generator. The carbonaceous feedstock and optionally the aqueous stream are reacted in a syngas generator in presence of oxygen, to produce gas stream (C) comprising hydrogen, carbon monoxide, heat energy and optionally steam at predetermined temperature and pressure. The gas stream is supplied into a heat exchanger unit optionally with a quench stream comprising water and/or steam, to remove heat energy and generate a cooled gas stream at predetermined temperature (a) and pressure. The cooled gas stream is separated into a hydromethanation gas feed stream and syngas raw product stream comprising carbon monoxide, hydrogen and optionally steam. Then, steam and/or heat energy are optionally added to the hydromethanation gas feed stream such that the resulting hydromethanation gas feed stream comprises hydrogen, carbon monoxide and steam at predetermined temperature and pressure. A carbonaceous feedstock (A1), hydromethanation catalyst, hydromethanation gas feed stream and optionally oxygen-rich gas stream (B1) are added to a hydromethanation reactor, reacted in presence of carbon monoxide, hydrogen, steam, hydromethanation catalyst and optionally oxygen at predetermined temperature and pressure, to produce methane-enriched raw product stream. The methane-enriched raw product stream comprises methane, carbon monoxide, hydrogen, carbon dioxide, hydrogen sulfide and heat energy. The methane-enriched product stream is withdrawn from the hydromethanation reactor, such that the reaction has syngas demand, steam demand and heat demand. The amount of carbon monoxide and hydrogen in the hydromethanation gas feed stream (or superheated hydromethanation gas feed stream if present) is sufficient to at least meet the syngas demand of the reaction. If the amount of steam in the hydromethanation gas feed stream is insufficient to meet the steam demand of the reaction, then steam is added to the hydromethanation gas feed stream in an amount which is sufficient to at least meet the steam demand of the reaction. If the temperature (a) is insufficient to meet the heat demand of the reaction, then heat energy is added to hydromethanation gas feed stream in an amount which is at least sufficient to meet the heat demand of the reaction. INDEPENDENT CLAIMS are included for the following:    (1) gasifier apparatus; and    (2) process for generating sweetened gas stream from carbonaceous feedstock.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view explaining the processing of methane-enriched raw product stream and optionally syngas raw product stream.    Waste heat boilers (400,402)    Contaminant removal unit (500)    Ammonia recovery and removal unit (600)    Sour shift unit (700)    Acid gas removal unit (800)