Pyrolysis and steam gasification processes of black liquor

Abstract

The black liquor composition was assumed to be C 10H 12.5O 7Na 2.4S 0.36, 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 from 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.