NOVELTY - Production of hydrocarbon derivative product, comprises indirectly heating primary feedstock in absence of oxygen to produce gas stream and solids; cleaning gas stream and removing carbon dioxide and solids; partially oxidizing secondary feedstock to produce heat for indirect heating of primary feedstock; and combining carbon monoxide and hydrogen gas from cleaned gas stream with secondary feedstock gas stream to produce mixed gas stream.    USE - The process is for production of hydrocarbon derivative product (i.e. predetermined CxHyOz product), particularly alcohols (e.g. methanol or ethanol), aldehydes, ketones, carboxylic acids, esters or other oxygenated hydrocarbon derivative (claimed). The hydrocarbon derivative product is used as fuel and a building block for pharmaceuticals, industrial chemicals, and man-made materials.    ADVANTAGE - The process involves a tighter control and more efficient use of the oxygen, hydrogen and carbon in any feedstock.    DETAILED DESCRIPTION - Production of hydrocarbon derivative product (i.e. predetermined CxHyOz product), comprises:    (1) providing a primary feedstock with a water content of not greater than 25%;    (2) indirectly heating the primary feedstock in the absence of oxygen to produce a gas stream and solids;    (3) cleaning the gas stream and removing carbon dioxide (CO2) and solids to produce a cleaned gas stream;    (4) determining the amount of carbon monoxide (CO) and hydrogen gas (H2) in the cleaned gas stream;    (5) partially oxidizing a secondary feedstock to produce heat for the indirect heating of the primary feedstock, and a secondary gas stream, the secondary feedstock selection based on determining the heat required to indirectly heat the primary feedstock, comparing the percentage of CO and H2 in the cleaned gas stream with the required CO and H2 to produce the predetermined CxHyOz product and determining the additional of CO and H2 required from the secondary feedstock, determining the secondary feedstock, calculating the amount of CO, H2 and heat to be produced from the secondary feedstock;    (6) combining the CO and H2 from the cleaned gas stream with the secondary feedstock gas stream to produce a mixed gas stream;    (7) adding a catalyst to the mixed gas stream to produce a predetermined CxHyOz gas; and    (8) distilling the predetermined CxHyOz gas to produce the predetermined CxHyOz product.    x,y,z=integers.    An INDEPENDENT CLAIM is also included for a process for designing a plant for producing a predetermined CxHyOz product, comprising:    (1) determining the heat required to indirectly heat the primary feedstock;    (2) comparing the percentage of CO and H2 in the cleaned gas stream with the required CO and H2 to produce the predetermined CxHyOz product and determining the additional of CO and H2 required from the secondary feedstock;    (3) determining the secondary feedstock; and    (4) calculating the amount of CO, H2 and heat to be produced from the secondary feedstock.    DESCRIPTION OF DRAWING(S) - The figure is a flow diagram of the process where ethanol is produced.