Process for the acid hydrolysis of waste cellulose to glucose
First Claim
1. In a process 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, the cellulose is continuously reacted in the presence of a dilute sulfuric acid catalyst at elevated temperature and pressure in the reaction zone by the continuous injection of steam or superheated water at elevated pressure downstream of the inlet port while being continuously conveyed to an outlet port of the extruder while the extruder temperature and pressure in the reaction zone is maintained by forming a dynamic seal zone at the upstream end of the reaction zone and valving at the downstream end, the improvement wherein the step of forming a dynamic seal zone at the upstream end of the reaction zone comprises providing an unthreaded and radially recessed discontinuity in the screws.
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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 continuously conveying same to an outlet port of the extruder and the reacted cellulose is discharged from the extruder the elevated temperature and pressure in the reaction zone is maintained, has the elevated pressure is maintained by forming a dynamic seal zone at the upstream end of the reaction zone by providing an unthreaded and radially recessed discontinuity in the screws.
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Citations
6 Claims
- 1. In a process 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, the cellulose is continuously reacted in the presence of a dilute sulfuric acid catalyst at elevated temperature and pressure in the reaction zone by the continuous injection of steam or superheated water at elevated pressure downstream of the inlet port while being continuously conveyed to an outlet port of the extruder while the extruder temperature and pressure in the reaction zone is maintained by forming a dynamic seal zone at the upstream end of the reaction zone and valving at the downstream end, the improvement wherein the step of forming a dynamic seal zone at the upstream end of the reaction zone comprises providing an unthreaded and radially recessed discontinuity in the screws.
Specification
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- Resources
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Current AssigneeGovernment of the United States of America
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Original AssigneeNew York University
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InventorsStanton, Robert, Rugg, Barry A.
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Primary Examiner(s)Marcus, Michael S.
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Application NumberUS06/131,339Time in Patent Office707 DaysField of Search127/1, 127/37, 127/28, 422/137, 366/83, 366/85, 366/88, 162/56, 162/236US Class Current127/37CPC Class CodesC13K 1/02 obtained by saccharificatio...
