Sugar – starch – and carbohydrates – Processes – Carbohydrate manufacture and refining
Patent
1981-04-17
1983-06-28
Marcus, Michael S.
Sugar, starch, and carbohydrates
Processes
Carbohydrate manufacture and refining
127 1, 127 28, C13K 102, B01J 303
Patent
active
043903754
ABSTRACT:
A process and apparatus for the acid hydrolysis of waste cellulose to glucose of the type wherein waste cellulose is continuously fed into an inlet port of a twin screw extruder, water is continuously fed into reaction zone in the extruder, downstream of the inlet port, the cellulose is continuously reacted with water in the presence of an acid catalyst at elevated temperature and pressure in the reaction zone while being continuously conveyed to an outlet port of the extruder having a given diameter and the reacted cellulose is discharged from the extruder while the elevated temperature and pressure in the reaction zone is maintained. The elevated pressure is maintained by forming a dynamic seal zone at the upstream end of the reaction and continuously discharging the reacted material downstream of the outlet port at a predetermined volume rate of flow to maintain the pressure by passing the discharge through an orifice pipe having a smaller diameter than the given diameter of the outlet port.
REFERENCES:
patent: 3045283 (1962-07-01), Keiser
patent: 3666141 (1972-05-01), Mel
patent: 4316747 (1982-02-01), Rugg et al.
patent: 4316748 (1982-02-01), Rugg et al.
Chemical Engineers' Handbook, Perry, 4th Ed. 55-59.
Rugg Barry
Stanton Robert
Marcus Michael S.
New York University
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