Bio-oil Synthesis from Botryococcus braunii by Microwave-assisted Pyrolysis

EDIXON DANIEL ORTIZ VILLAMIZAR, Prof. Dr.Eng. Ir. Arief Budiman, M.S..; Rochim Bakti Cahyono, ST., M.Sc. Ph.D

2021 | Tesis | MAGISTER TEKNIK KIMIA

Microalgae is well known in the production of bio-fuels and one of the promising renewable energy resource for substitution of petroleum-crude oil. The objective of this study is to evaluate the potential for obtaining bio-oil from microalgae through microwave-assisted pyrolysis (MAP), as well as to determine the kinetic constants of the reaction. MAP is a new thermochemical conversion of biomass to bio-oil that is more rapid, efficient, controllable, and flexible, as compared to conventional pyrolysis, such as rapid pyrolysis or flash pyrolysis exist. In this experiment, Indonesian microalgae, Botryococcus braunii was used as feedstock. The investigation was focused on temperature effect (100-300 C) and residence time (10-30 min). Hexane was used for the extraction of bio-oil. The composition of bio-oil was measured with gas chromatography-mass spectrometry (GC-MS) and by these data was then used to evaluate a kinetic model and calculate the reaction kinetic constants of the pyrolysis process. The results indicated that the production of bio-oil starts from 100 C, however temperatures between 200-250 C favor the production of bio-oil, while temperatures greater than 250 C and long residence times prioritize the production of bio-gas.

Microalgae is well known in the production of bio-fuels and one of the promising renewable energy resource for substitution of petroleum-crude oil. The objective of this study is to evaluate the potential for obtaining bio-oil from microalgae through microwave-assisted pyrolysis (MAP), as well as to determine the kinetic constants of the reaction. MAP is a new thermochemical conversion of biomass to bio-oil that is more rapid, efficient, controllable, and flexible, as compared to conventional pyrolysis, such as rapid pyrolysis or flash pyrolysis exist. In this experiment, Indonesian microalgae, Botryococcus braunii was used as feedstock. The investigation was focused on temperature effect (100-300 C) and residence time (10-30 min). Hexane was used for the extraction of bio-oil. The composition of bio-oil was measured with gas chromatography-mass spectrometry (GC-MS) and by these data was then used to evaluate a kinetic model and calculate the reaction kinetic constants of the pyrolysis process. The results indicated that the production of bio-oil starts from 100 C, however temperatures between 200-250 C favor the production of bio-oil, while temperatures greater than 250C and long residence times prioritize the production of bio-gas.

Kata Kunci : microwave, pyrolysis, microalgae, biooil, biofuel