Chromatographic characterization of bio-oil generated from rapid pyrolysis of rice husk in stainless steel reactor

摘要

This paper reports the use of GC/qMS for the qualitative and quantitative characterization of compounds present in the bio-oil obtained by rapid pyrolysis of the rice husk in a pilot plant with stainless steel reactor at 500 and 700 degrees C. To advantage the sensitivity and selectivity of the detector to the analytes, derivatization was employed, improving the identification of the constituents of the bio-oil. In the qualitative analysis, high composition of compounds of the carboxylic acid, ketone and phenol functions were identified. Quantitative analysis, which allows the determination of compound concentrations, provided the concentrations of the major compounds of bio-oil, benzofuran, phenols and vanillin. Phenol, cresols, ethyl phenols and 2-methoxy-4-vinyl showed the highest levels of concentration. The quantitative analysis also demonstrated that the process can be satisfactorily developed at a lower temperature, 500 degrees C, obtaining bio-oil with the same composition as that obtained at 700 degrees C, providing energy savings during the pyrolysis process. The final disposal of the rice husk may be accompanied by environmental problems, requiring special treatment. However, its pyrolysis to obtain bio-oil presents, besides environmental advantages, the possibility of obtaining products of great industrial interest. (C) 2017 Elsevier B.V. All rights reserved.