Here's a P&ID of Hydrothermal Liquefication Process with a continuous process and continuous stir tank reactor. Hydrothermal liquefaction is a process in which the macromolecules that make up biomass are hydrolyzed or destroyed by water at high pressures and temperatures. This procedure is typically carried out at temperatures ranging from 280°C to 370°C and pressures ranging from 10 to 25 MPa.