Paper making and fiber liberation – Apparatus – Digester
Patent
1993-10-21
1995-10-03
Jones, W. Gary
Paper making and fiber liberation
Apparatus
Digester
162246, 162 21, 162 47, 127 37, D21C 700, D21C 708, D21C 710
Patent
active
054549116
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 hydrolyzing 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 sustem 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
Convertech Group Limited
Jones W. Gary
Nguyen Dean T.
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