Biochar-assisted upgradation of pyrolytic oil via slow pyrolysis of rice husk under a carbon dioxide environment.

Autor: Das, Sutapa, Goud, Vaibhav V.
Zdroj: Biomass Conversion & Biorefinery; Jul2024, Vol. 14 Issue 13, p13807-13819, 13p
Abstrakt: Rice husk (RH) is the major by-product of the paddy industry and a major cause of air pollution in the northern part of India. In this work, experiments have been performed to utilize these wastes in a sustainable way to produce bio-oil (pyrolysis oil) and other valuables such as biochar and uncondensed gases, via a slow-pyrolysis method in presence of a reactive environment. Major parameters affecting the pyrolysis process, i.e., pyrolysis temperature, gas flow rate, and holding time, were optimized using the response surface methodology (RSM) technique. The quadratic equation was developed to correlate the operating parameters with the pyrolysis oil yield. Among all the process variables, temperature significantly affected the pyrolysis process. The highest pyrolysis oil yield (31.7 wt%) was found at 551 °C, 1.1 LPM, and 53 min. The initial characterization of the pyrolysis oil prompted its further upgradation by utilizing the obtained biochar as an enhancer for improving the physical characteristics of the pyrolysis oil. The addition of biochar improved the chemical composition (degradation of inhibitors and formation of phenolics) as well as the physical characteristics (increased calorific value and pH) of the pyrolysis oil. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index