Patent ID: 8404051
Filing Date: 2013-03-26
Classification: C04B,C07G,C08H,C10G,D21C,Y02P,Y10T

Abstract:
1. A method of preparing lignin from lignocellulosic biomass, comprising: providing lignocellulosic biomass under a first pressure of at least about 220 bar and at a first temperature of at least about 360° C., comprising: wherein said lignocellulosic biomass is fractionated to remove at least a portion of C gradually reducing said first pressure of said lignocellulosic biomass to a second pressure while substantially simultaneously and gradually reducing said first temperature of said lignocellulosic biomass to a second temperature at least about 1° C. above the glass transition temperature of lignin at said second pressure; wherein said first liquid fraction is not substantially gasified; and substantially simultaneously reducing said second pressure and said second temperature to a third pressure and a third temperature in a time less than about 1 second to precipitate said soluble lignin in said first liquid fraction and form a mixture comprising: