Thermogravimetric studies on the kinetics of rice hull pyrolysis and the influence of water treatment

Hsisheng Teng, Yun Chou Wei

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144 Citations (Scopus)

Abstract

Rice hulls were pyrolyzed in a thermogravimetric analyzer in a helium atmosphere to determine the kinetic parameters of devolatilization reactions. The pyrolysis experiments were conducted by heating rice hulls from room temperature to 1173 K at constant heating rates of 3,10, 30, 60, and 100 K/min. The global mass loss during rice hull pyrolysis was successfully simulated by a combination of four independent parallel reactions, the decompositions of four major components in rice hulls: moisture, hemicellulose, cellulose, and lignin. The activation energy for the decomposition of the nonmoisture components was in the order cellulose hemicellulose > lignin. It was also found in the present study that the pyrolytic behaviors were significantly influenced by water wash-prior to pyrolysis. The water wash elevates the peak temperature and the activation energy for the decomposition of each component of rice hulls. The volatile yields resulting from cellulose and hemicellulose decompositions during rice hull pyrolysis increase due to the water treatment, whereas those from lignin decomposition and the char yield decrease.

Original languageEnglish
Pages (from-to)3806-3811
Number of pages6
JournalIndustrial and Engineering Chemistry Research
Volume37
Issue number10
DOIs
Publication statusPublished - 1998 Jan 1

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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