Rate and mechanism of black liquor char gasification with CO[sub 2] at elevated pressures

Journal Article · Sun Aug 01 04:00:00 EDT 1993 · Industrial and Engineering Chemistry Research; (United States)

DOI:https://doi.org/10.1021/ie00020a031· OSTI ID:6030194

Frederick, W J ^[1]; Wag, K J; Hupa, M M ^[2]

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1. Oregon State Univ., Corvallis, OR (United States). Dept. of Chemical Engineering
2. Abo Akedemi Univ., Turku (Finland). Dept. of Chemical Engineering

The kinetics of sodium-catalyzed CO[sub 2] gasification of carbon at elevated pressures were investigated using a char, produced from spent kraft pulping liquor, in which the catalyst is distributed more uniformly in the carbon matrix than in alkali-metal-impregnated carbons. Gasification measurements were carried out in a pressurized thermobalance at 700 C, 0.1--25 bar CO[sub 2] partial pressures, and 0--6 bar CO partial pressures. The rate of gasification was an order of magnitude or more higher than the rate of gasification of potassium-impregnated activated carbon and several orders of magnitude greater than for alkali-metal-impregnated coal chars. It was less than first order in CO[sub 2], strongly inhibited by CO, and strongly temperature dependent. The gasification kinetics followed the same mechanism as reported previously for potassium-catalyzed CO[sub 2] gasification of activated carbon in spite of large differences in the carbon source, catalyst type, and loading. The rate of gasification initially increased with increasing carbon conversion, but decreased with increasing conversion over most of the range of conversion. The change in rate with carbon conversion is apparently related to changes in the number of active carbon sites and catalyst sites. There was no loss of sodium from the char during gasification.

• OSTI ID: 6030194
• Journal Information: Industrial and Engineering Chemistry Research; (United States), Journal Name: Industrial and Engineering Chemistry Research; (United States) Vol. 32:8; ISSN IECRED; ISSN 0888-5885
• Country of Publication: United States
• Language: English

Related Subjects

09 BIOMASS FUELS
090900* -- Biomass Fuels-- Processing-- (1990-)
ACTIVATED CARBON
ADSORBENTS
ALKALI METALS
CARBON
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CATALYTIC EFFECTS
CHALCOGENIDES
CHARS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COKE
DECOMPOSITION
ELEMENTS
GASIFICATION
INDUSTRIAL WASTES
INDUSTRY
KINETICS
LIQUID WASTES
METALS
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PAPER INDUSTRY
POTASSIUM
PYROLYSIS
PYROLYSIS PRODUCTS
REACTION KINETICS
SODIUM
SPENT LIQUORS
THERMOCHEMICAL PROCESSES
WASTES
WOOD PRODUCTS INDUSTRY