Process and system for producing pulp, energy, and bioderivatives from plant-based and recycled materials

A system comprising:

• a pre-processing portion having a mechanical processor/material handler for extraction of water soluble fermentable carbohydrates and preparation of material for further extraction;
• an extractor portion comprising a reactor or a reactor assembly to which biomass and subcritical water is supplied, the reactor or the reactor assembly having a first operating condition at a first pressure and a first temperature at a constant level that is held for a first defined period of time to break down carbohydrates of a first chain strength and a second operating condition at a second pressure and a second temperature at a constant level that is held for a defined second period of time to break down remaining oligo-carbohydrates of a second chain strength and fatty acids,
• wherein the system is repeatable until the recovery rate of the fermentable carbohydrates, fatty acid, or both reaches a desired yield, and
• wherein the mechanical processor/material handler of the pre-processing portion comprises a mechanical press for primary extraction of soluble carbohydrates, a wet or dry mill operably coupled to a material feeding mechanism, or both.