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Title: Enhanced attrition bioreactor for enzyme hydrolysis of cellulosic materials

A process is described for converting cellulosic materials, such as waste paper, into fuels and chemicals, such as sugars and ethanol, utilizing enzymatic hydrolysis of the major carbohydrate of paper: cellulose. A waste paper slurry is contacted by cellulase in an agitated hydrolyzer. An attritor and a cellobiase reactor are coupled to the agitated hydrolyzer to improve reaction efficiency. Additionally, microfiltration, ultrafiltration and reverse osmosis steps are included to further increase reaction efficiency. The resulting sugars are converted to a dilute product in a fluidized-bed bioreactor utilizing a biocatalyst, such as microorganisms. The dilute product is then concentrated and purified. 1 fig.
Inventors:
; ; ; ;
Issue Date:
OSTI Identifier:
489076
Assignee:
Lockheed Martin Energy Systems, Inc., Oak Ridge, TN (United States) PTO; SCA: 090900; PA: EDB-97:084694; SN: 97001799027
Patent Number(s):
US 5,637,502/A/
Application Number:
PAN: 8-591,272
Contract Number:
AC05-84OR21400
Resource Relation:
Other Information: PBD: 10 Jun 1997
Research Org:
Lockheed Martin Energy Syst Inc
Sponsoring Org:
USDOE Assistant Secretary for Conservation and Renewable Energy, Washington, DC (United States)
Country of Publication:
United States
Language:
English
Subject:
09 BIOMASS FUELS; CELLULOSE; ENZYMATIC HYDROLYSIS; BIOREACTORS; DESIGN; CELLULASE; SEPARATION PROCESSES; OPERATION