NOVELTY - A solar-driven chemical plant comprises a solar thermal receiver having a cavity with an inner wall, and is aligned to absorb concentrated solar energy from array of heliostats and/or solar concentrating dish; and reactor (200) having reactor tubes (202, 204, 206, 208) inside the cavity, where chemical reaction driven by radiant heat occurs in tubes, and particles of biomass are gasified using steam carrier gas and methane in simultaneous steam reformation and steam biomass gasification reaction to form products having hydrogen and carbon monoxide gas by using solar thermal energy.    USE - For production of chemicals (claimed).    ADVANTAGE - The plant utilizes simple tube design with the external concentrated solar thermal energy driving the biomass gasification reaction, steam reforming reaction, and dry reforming reaction to allow the process to be feedstock flexible, with no major equipment redesign required to change feedstocks.    DETAILED DESCRIPTION - A solar-driven chemical plant comprises a solar thermal receiver having a cavity with an inner wall, and is aligned to absorb concentrated solar energy from at least one of an array of heliostats and/or solar concentrating dish; and a solar-driven chemical reactor (200) having reactor tubes (202, 204, 206, 208) located inside the cavity of receiver, where a chemical reaction driven by radiant heat occurs in the tubes, and particles of biomass are gasified in presence of a steam (H2O) carrier gas and methane (CH4) in a simultaneous steam reformation and steam biomass gasification reaction to produce reaction products that include hydrogen and carbon monoxide gas using the solar thermal energy from the absorbed concentrated solar energy in the tubes. The plant further comprises an entraining gas biomass feed system that uses an entrainment carrier gas comprising natural gas, steam and/or air and supplies a variety of feed stock biomass sources fed as particles into the solar driven chemical reactor; a control system configured to control the receiver temperature by balancing the biomass and natural gas or methane feed rate against available solar energy such that the temperature in the receiver is maintained at a desired set point of 800-1600 degrees C by the balance of solar energy entering the aperture, energy consumed by the chemical reaction and reactant/product sensible heat, and thermal losses from the receiver by radiation, convection and/or conduction; a synthesis reactor having a supply input to receive syngas containing the resultant hydrogen molecules and the carbon monoxide molecules from the solar driven chemical reactor; a moving bed of carbonaceous feedstock through which the gasification agent flows in a co-current or counter-current configuration to achieve gasification and the bed is heated with solar thermal energy; and a first tube that is graphite reaction tube with an external SiC coating operating at up to 1500 degrees C. The reactor tubes are configured for methane, natural gas and/or steam to pass through a heat transfer aid to cause a steam methane reaction using the thermal energy from the solar radiant energy. An INDEPENDENT CLAIM is included for production of chemicals using solar energy involving providing the solar-driven chemical plant; providing a biomass source comprising at least one of cellulose, lignin, pine sawdust, rice straw, corn stover, switch grass, energy crops, source separated green wastes, sorghum, forestry thinnings forestry waste, and algae to the reactor tubes; and causing the simultaneous steam methane reformation and biomass gasification reaction to produce reaction products that include hydrogen and carbon monoxide gas using the solar thermal energy from the absorbed concentrated solar energy in the multiple reactor tubes.    DESCRIPTION OF DRAWING(S) - The figure shows a solar-driven chemical reactor.    Solar-driven chemical reactor (200)    Reactor tubes (202, 204, 206, 208)