Abstract
AbstractCO2 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% Na2 CO3. 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.
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