Pyrolysis and steam gasification processes of black liquor

The black liquor composition was assumed to be C10H12,5O7Na2.4S0.36, which corresponds to kraft liquor with a molar ratio of S/Na-2 of 0.3. The yields of liquid products from the black liquor pyrolysis increase from 17.2% to 26.5% with increasing temperature from 600 to 800 K. The yields of liquid and gaseous products from pyrolysis of the black liquor samples increase with increasing temperature. The yields of (H-2 + paraffins) in the gaseous products from the black liquor steam gasification run (Water/Black liquor = 1.9) increase frorn 38.0% to 50.3% with increasing temperature from 975 to 1325 K. The highest hydrogen rich gas yield was obtained from the catalytic steam gasification run (Water/Black liquor = 1.9) at 1325 K. (C) 2002 Elsevier Science Ltd. All rights reserved.