CO-PYROLYSIS OF COTTON STALKS AND WASTE TIRES IN FIXED BED REACTOR

Abstract

In this study, effect of waste tire (WT) addition to cotton stalk (CS) pyrolysis is investigated with a focus on quantity and quality of liquid co-pyrolysis yield. Pyrolysis and co-pyrolysis of various blend ratios (i.e. CS/WT 1:0, 4:1, 3:2, 2:3, 0:1) of the two feedstocks were carried out in a fixed bed reactor at 200C/min heating ramp rate up to 5500C with 50ml/min flowrate of nitrogen as sweeping gas. Blend ratio CS/WT (2:3) showed maximum oil yield (48 wt% of the feedstock) with organic phase (OP) above 78 wt% of the total liquid yield (OP + aqueous phase, AP). OP of CS[WT (2:3) along with those of CS/WT (1:0) and (0:1) were further analyzed for qualitative evaluation. Physico-chemical properties of the OPS were investigated using different analytical techniques including, FTIR, GC-MS, bomb calorimetry and elemental analyzer. Significant increase in carbon and decrease in oxygen content of the CS/WT (2:3) pyrolytic oil was observed as compared to that of CS/WT (1:0) which improved its calorific value to 41MJ/kg. Among the three OP samples, only CS/WT (2:3) oil showed significant presence of alkanes in GC-MS results, which is, thus, associated with the synergistic effect of the co-pyrolysis process. Addition of WT to CS pyrolysis feedstock improved liquid yield and its quality, thus requiring lesser further processing for its commercial use as compared to that of CS/WT (1:0) oil.