Attrition reactor system

• US 5,248,484 A
• Filed: 09/15/1992
• Issued: 09/28/1993
• Est. Priority Date: 08/05/1991
• Status: Expired due to Fees

• Current Assignee: Martin Marietta Energy Systems, Inc. (Martin Marietta Corporation)
• Original Assignee: Martin Marietta Energy Systems, Inc. (Martin Marietta Corporation)
• Inventors: Davison, Brian H., Scott, Charles D.
• Primary Examiner(s): Warden, Robert J.
• Assistant Examiner(s): Thornton, Krisanne M.
• Application Number:
  US07/945,997
• Time in Patent Office: 378 Days
• Field of Search: 422/224-225, 422/232, 422/234, 241/46.17
• US Class Current: 422/225
• CPC Class Codes: B01F 33/831 Devices with consecutive working receptacles, e.g. with two intermeshing tools in one of the receptacles B01F33/8305 takes precedence
• CPC Class Codes: B01J 19/1881 externally, i.e. the mixture leaving the vessel and subsequently re-entering it

Abstract

A reactor vessel for reacting a solid particulate with a liquid reactant has a centrifugal pump in circulatory flow communication with the reactor vessel for providing particulate attrition, resulting in additional fresh surface where the reaction can occur.

Claims

1. An attrition reactor system comprising a reactor vessel containing a solid particulate cellulosic substrate and an aqueous hydrolyzing reactant;

and an attriting means, said attriting means comprising a centrifugal pump consisting essentially of a housing having an internal cavity and a rotor having vanes disposed in said cavity, said centrifugal pump being in circulatory flow communication with said reactor vessel, said centrifugal pump being operable at a speed sufficient to attrit said solid particulate cellulosic substrate sufficiently to react with said aqueous hydrolyzing reactant.

2. The attrition reactor system according to claim 1 wherein said centrifugal pump is located externally to said reactor vessel, and wherein said centrifugal pump further comprises attritor feed and attritor return lines to provide said circulatory flow communication.

3. A method for hydrolyzing a solid particulate cellulosic substrate comprising the steps of:

providing a reactor vessel;

introducing said solid particulate cellulosic substrate and an aqueous hydrolyzing reactant into said reactor vessel to form a slurry; and

attriting said solid particulate cellulosic substrate using an attriting means, said attriting means comprising a centrifugal pump consisting essentially of a housing having an internal cavity and a rotor having vanes disposed in said cavity, said centrifugal pump being in circulatory flow communication with said reactor vessel,

said attriting means circulating said slurry through said centrifugal pump and attriting said solid particulate cellulosic substrate sufficiently to react said solid particulate cellulosic substrate with said aqueous hydrolyzing reactant.

4. The method according to claim 3 wherein said centrifugal pump is located externally to said reactor vessel, and wherein said centrifugal pump further comprises attritor feed and attritor return lines to provide said circulatory flow communication.

5. A method for hydrolyzing waste paper comprising the steps of:

providing a reactor vessel;

introducing into said reactor vessel an aqueous slurry containing shredded waste paper having a surface and a cellulase enzyme for hydrolyzing said shredded waste paper;

operating said reactor vessel so that a hydrolyzing reaction occurs on said surface of said shredded waste paper; and

attriting said shredded waste paper using an attriting means, said attriting means comprising a centrifugal pump consisting essentially of a housing having an internal cavity and a rotor having vanes disposed in said cavity, said centrifugal pump being in circulatory flow communication with said reactor vessel,

said attriting means circulating said slurry through said centrifugal pump and attriting said shredded waste paper sufficiently to react said shredded waste paper with said cellulase enzyme.