ELUCIDATING THE SOLID, LIQUID, AND GASEOUS PRODUCTS FROM BATCH PYROLYSIS OF COTTON GIN TRASH
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Cotton gin trash (CGT) was pyrolyzed at different temperatures and reaction times in a programmable temperature-controlled furnace. The total amount of output products (solid, liquid condensate, and non-condensable gases) from the pyrolysis of cotton gin trash was determined. The CGT was air-dried to reduce the moisture content to approximately 20 weight percent (wt. %). The heating value of the raw CGT was determined to be 16600 kJ kg -1. The CGT was pyrolyzed at the temperatures of 600, 700, and 800C. The maximum char yield of >38 wt.% was determined at the temperature of 700C and pyrolysis period of 45 min, and it was based on the highest char heating value of 22500 kJ kg -1. The highest gaseous product yield was >40 wt.% at 800C and 60 min combination. The liquid condensates reached >30 wt.% but it was also noted that a major portion (ca. 90 wt.%) of the liquid is composed of water and the remaining portion is composed of different oils, alcohols and other volatile liquids. The amount of solid produced generally decreased as the pyrolysis time and temperature increased. Moreover, the amount of gas yield increased as the pyrolysis time and temperature increased, while the amount of liquid yield increased in parallel with temperature but not with pyrolysis time. By elucidating on the solid, liquid and gaseous products of CGT pyrolysis, the conversion process could be modeled for the optimal production of either char for the production of activated carbon or syngas for the production of synthetic petroleum via catalytic cracking and reforming processes.
