Method of rendering lignin separable from cellulose and...

Details Method of rendering lignin separable from cellulose and... Method of rendering lignin separable from cellulose and...

C - Chemistry, Metallurgy

07

G

260/133

C07G 1/00 (2006.01) C08H 6/00 (2010.01)

Patent

CA 1141376

T I T L E A METHOD OF RENDERING LIGNIN SEPARABLE FROM CELLULOSE AND HEMICELLULOSE AND THE PRODUCT SO PRODUCED I N V E N T O R Edward A. De Long ABSTRACT OF DISCLOSURE In the process for rendering lignin in lignocellulosic material separable from the cellulose and hemicellulose wherein the lignocellulosic material is packed in a divided form in a pressure vessel which is rapidly filled with steam at a pressure of at least 500 psi to heat the lignocellulosic material to an extrudable condition at a tempera- ture in the range 185 to 240°C in less than 60 seconds, followed by imme- diately extruding the lignocellulosic material to atmosphere, it has been found that the production of toxic components can be minimized by gently venting the pressure vessel to atmosphere to reduce the steam pressure to between of the order of 200 psi and of the order of 450 psi as soon as the extrudable condition is reached. The lignocellulosic material is then extruded instantly to atmosphere immediately after the venting step.

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