Process for preparing a hydrolysed lingnocellulosic material

Details Process for preparing a hydrolysed lingnocellulosic material Process for preparing a hydrolysed lingnocellulosic material

1990-05-09

1994-07-12

Jones, W. Gary

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Defibration by projection or explosion

162 47, 162 68, 162247, 127 37, D21B 112

Patent

active

053285620

ABSTRACT:
An energy efficient process for hydrolyzing lignocellulosic materials which comprises using a primary system by providing a start-up energy input to operating saturated steam conditions and thereafter operating the primary system with substantially constant energy input, the condition of the hydrolysing saturated steam being controlled by water injection and/or steam bleeding from the primary system. The dwell time of the solids stream in the primary system is controlled by controlling its passage with flashing off of steam into a secondary system where drying occurs together with some small measure of hydrolysis in a lower pressure superheated steam environment, there being an energy input into the secondary system using steam bled from the primary system. The output solids material stream is preferably capable of being self polymerized into a formed shape eg a board.

REFERENCES:
patent: 1995145 (1935-03-01), Frost
patent: 2947654 (1960-08-01), Chapman
patent: 4152197 (1979-05-01), Lindahl et al.
patent: 4326913 (1982-04-01), Mattsson
patent: 4708746 (1987-11-01), Hinger

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