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Reaction kinetics of gasification of black liquor char
Author(s) -
Li J.,
Van Heiningen A. R. P.
Publication year - 1989
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450670426
Subject(s) - char , black liquor , kinetics , kraft process , alkali metal , chemical engineering , chemistry , kraft paper , materials science , coal , organic chemistry , composite material , lignin , engineering , physics , quantum mechanics
CO 2 gasification of black liquor char, prepared from kraft spent pulping liquor is studied thermogravimetrically up to 775°C. The gasification rate is described by Langmuir‐Hinshelwood type kinetics and activation energy is similar to that found for alkali metal impregnated porous carbons. However the rate is about 20 times larger than that of coal char mixed with 10‐20% Na 2 CO 3 . CO inhibition is relatively small and the rate is first order in carbon up to 80% conversion. The behavior is explained by a fine and three‐dimensional dispersion of sodium salts in the char. The rate is insensitive to pulping conditions over the range of industrial practice.