NOVELTY - The process for treatment of lignocellulosic biomass to produce biofuels, comprises forming a biomass slurry by mixing biomass with a working fluid, inducing the biomass slurry to flow through an inlet into a passage, and injecting a high velocity transport fluid into the slurry through a nozzle communicating with the passage at supersonic velocity. The injection of high velocity transport fluid applies a shear force to the slurry such that the working fluid is atomized and forms a vapor and droplet flow regime, and forms a partial vacuum within the passage downstream of the nozzle.    USE - The process is useful for the treatment of lignocellulosic biomass to produce biofuels.    ADVANTAGE - The process is capable of simply, quickly and economically treating the lignocellulosic biomass without damaging the environment.    DETAILED DESCRIPTION - The process for treatment of lignocellulosic biomass to produce biofuels, comprises forming a biomass slurry by mixing biomass with a working fluid, inducing the biomass slurry to flow through an inlet into a passage, and injecting a high velocity transport fluid into the slurry through a nozzle communicating with the passage at supersonic velocity. The injection of high velocity transport fluid applies a shear force to the slurry such that the working fluid is atomized and forms a vapor and droplet flow regime, forms a partial vacuum within the passage downstream of the nozzle, and generates a condensation shock wave within the passage downstream of the nozzle and vacuum by condensation of the transport fluid. The transport fluid is steam. First and/or second catalysts are an acid or a gas, and are injected into the slurry as it passes through the partial vacuum within the passage. Thermophilic microorganisms are introduced into the biomass slurry to convert sugars into alcohol in a fermentation step. The alcohol is vaporized in the slurry as it passes through the partial vacuum. The alcohol vapor is separated vapor from the remaining slurry. An INDEPENDENT CLAIM is included for a biomass treatment apparatus.    DESCRIPTION OF DRAWING(S) - The diagram shows a processing apparatus for treatment of lignocellulosic biomass.    First hopper (22)    Solids-handling pump (24)    Catalyst additive port (25)    Sensor (27)    First sampling port. (28)