NOVELTY - The method for producing a 4C or higher fuel molecule such as diethyl ether, diesel fuel, aviation fuel and jet fuel including gasoline, comprises performing a fermentation reaction with the use of a renewable carbon-containing starting material to produce ethanol, extracting the ethanol from the fermentation reaction, and converting the ethanol to a 4C or higher fuel molecule. The renewable carbon-containing starting material is glucose. The step of extracting the ethanol from the fermentation reaction comprises a distillation step.    USE - The method is useful for producing a 4C or higher fuel molecule such as diethyl ether, diesel fuel, aviation fuel, and jet fuel including gasoline, green diesel, kerosene-type jet fuel, naphtha-type jet fuel, jet A, jet A-1, jet B, JP(jet propellant)-1, JP-4, JP-5, JP-7, JP-8, or JPTS (jet propellant thermally stable) jet fuel.    ADVANTAGE - The method is capable of economically and easily producing a pure 4C or higher fuel molecule, reduces or eliminates the presence of sodium, sulfur, nitrogen, phosphates, metals (e.g. vanadium) or particulate matter during the production of starting material, and minimizes the degradation breakdown and/or contamination or coking of catalysts to produce longer chain hydrocarbons.    DETAILED DESCRIPTION - The method for producing a 4C or higher fuel molecule such as diethyl ether, diesel fuel, aviation fuel and jet fuel including gasoline, comprises performing a fermentation reaction with the use of a renewable carbon-containing starting material to produce ethanol, extracting the ethanol from the fermentation reaction, and converting the ethanol to a 4C or higher fuel molecule. The renewable carbon-containing starting material is glucose. The step of extracting the ethanol from the fermentation reaction comprises a distillation step. The step of converting ethanol occurs by reductive dehydrogenation to produce a fully saturated medium chain hydrocarbon. The renewable carbon-containing starting material is obtained by hydrolyzing biopolymers present in a feedstock to liberate renewable carbon-containing starting material. The feedstock includes primarily cellulosic biomass such as a source of starch or sugar. The ethanol is converted to diethyl ether using a metal catalyst and a heteropolyacid catalyst. The diethyl ether is converted to a hydrocarbon using a catalyst such as a molecule sieve and zeolite (ZSM-5). INDEPENDENT CLAIMS are included for:    (1) a fuel production plant; and    (2) a reactor to produce jet fuel.    DESCRIPTION OF DRAWING(S) - The diagram shows an overview of ethanol production process resulting in production of ethanol and fuel molecules.