NOVELTY - Continuous process for conversion of thermally treated lignocellulosic biomass containing carbohydrates and lignin involves reducing fiber shives of thermally treated lignocellulosic biomass and deoxygenating lignin to lignin conversion products in lignin conversion reactor, while simultaneously removing greater than or equal to 1 portion of reactor contents from reactor in continuous manner, in which deoxygenation occurs in presence of hydrogen gas and 1st catalyst, deoxygenation temperature is 190-370 degrees C, and deoxygenation pressure is 70-300 bar.    USE - Continuous process for conversion of thermally treated lignocellulosic biomass for production of polyester preforms and bottles (claimed).    ADVANTAGE - Lignocellulosic biomass can be continuously converted into useful products, and product yield can be improved.    DETAILED DESCRIPTION - Continuous process for conversion of thermally treated lignocellulosic biomass containing carbohydrates and lignin involves reducing fiber shives of thermally treated lignocellulosic biomass in which percent area of fiber shives having shive length of greater than or equal to 737 mu m relative to total area of fiber shives, fibers, and fines of thermally treated lignocellulosic biomass after fiber shives reduction is less than the percent area of fiber shives having shive length of greater than or equal to 737 mu m relative to total area of fiber shives, fibers, and fines of thermally treated lignocellulosic biomass before fiber shives reduction and percent area is measured by automated optical analysis, and deoxygenating lignin to lignin conversion products, in lignin conversion reactor containing reactor contents consisting of liquid composition which contains greater than or equal to 1 compound which is liquid at 1 bar and 25 degrees C, while simultaneously removing greater than or equal to 1 portion of reactor contents from reactor in continuous manner, in which deoxygenation occurs in presence of hydrogen gas and 1st catalyst, deoxygenation temperature is 190-370 degrees C, deoxygenation pressure is 70-300 bar, and deoxygenation temperature and deoxygenation pressure are selected relative to the portion of the reactor contents removed from the reactor so that greater than or equal to 1 portion of water in reactor is maintained and present as liquid water. Thermally treated lignocellulosic biomass is in the form of fibers, fines, and fiber shives. Fibers each have width of less than or equal to 75 mu m and fiber length of greater than or equal to 200 mu m. Fines each have width of less than or equal to 75 mu m and fine length of less than or equal to 200 mu m. Fiber shives each have shive width of greater than or equal to 75 mu m, with 1st portion of fiber shives each having shive length of less than or equal to 737 mu m and 2nd portion of fiber shives each having shive length of greater than or equal to 737 mu m.    DESCRIPTION OF DRAWING(S) - The drawing shows a table of screw design of twin screw extruder used in the experiments.