Kinetics and mass transfer for supercritical fluid extraction of wood

Journal Article · Wed Jan 31 23:00:00 EST 1990 · Industrial and Engineering Chemistry Research; (USA)

DOI:https://doi.org/10.1021/ie00098a020· OSTI ID:6839792

Goto, M ^[1]; Smith, J M; McCoy, B J ^[2]

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1. Kumamoto Univ. (Japan)
2. California Univ., Davis, CA (USA). Dept. of Chemical Engineering

Rates of extraction of lignin from white fir sapwood with supercritical {ital tert}-butyl alcohol were measured dynamically in a continuous-flow system. The extraction rate increased with temperature and pressure but was independent of particle size and flow rate for our experimental conditions. A model is presented for the supercritical reaction-extraction process, accounting for the reaction of solid lignin in the particle, intraparticle diffusion, and external mass transfer of lignin derivatives. For the reaction in the particle, two parallel first-order reactions for the degradation of two lignin types satisfactorily represent the data. The kinetic parameters for the reaction were estimated from the model analysis. Model simulations supported the experimental results, which showed the extraction process was not affected by the mass transfer.

• OSTI ID: 6839792
• Journal Information: Industrial and Engineering Chemistry Research; (USA), Journal Name: Industrial and Engineering Chemistry Research; (USA) Vol. 29:2; ISSN 0888-5885; ISSN IECRE
• Country of Publication: United States
• Language: English

Related Subjects

09 BIOMASS FUELS
090900* -- Biomass Fuels-- Processing-- (1990-)
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
CARBOHYDRATES
CHEMICAL REACTION KINETICS
CHROMATOGRAPHY
CONVERSION
ENERGY CONVERSION
FLOW RATE
KINETICS
LIGNIN
MASS TRANSFER
MATHEMATICAL MODELS
ORGANIC COMPOUNDS
PARTICLE SIZE
POLYSACCHARIDES
REACTION KINETICS
SACCHARIDES
SEPARATION PROCESSES
SIZE
SUPERCRITICAL FLUID CHROMATOGRAPHY
WOOD