Banca de DEFESA: MARCIO BARBALHO DANTAS BEZERRA

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
DISCENTE : MARCIO BARBALHO DANTAS BEZERRA
DATA : 09/12/2016
HORA: 14:00
LOCAL: AUDITÓRIO DO PPGEQ
TÍTULO:

"Fast pyrolysis of elephant grass under different reactive atmospheres and catalytic upgrading of the resulting bio-oil"

PALAVRAS-CHAVES:

Pyrolysis; bio-oil; reactive atmosphere; HZSM-5; deoxygenation

PÁGINAS: 138
GRANDE ÁREA: Engenharias
ÁREA: Engenharia Química
RESUMO:

In recent years, due to the progressive depletion of conventional fossil fuels,

renewable energy sources have played an important role in the energy matrix. Among these

sources, the lignocellulosic biomass appears as a viable option, available and relatively

easy to grow, without competing with food production. Fast pyrolysis stands as a route of

transformation of biomass into products of different phases (gas, bio-oil, char and pyrolytic

condensate) with various applications. In this work, bio-oil is produced from elephant-grass

(Schumach Pennisetum Purpureum) in 1.5 and 40 kg/h fluidized bed reactors under different

atmospheres (air, N₂ and gas recycled from pyrolysis itself) at a temperature of 500°C. In the

1.5 kg/h reactor, we carried out experiments with and without the HZSM-5 catalyst, both under

N₂. Pyrolysis without catalyst was also conducted with recycle (54, 74 and 85%) of gases.

In the 40 kg/h reactor, we conducted experiments under moderate oxidative atmosphere of air

(71% N₂ and 21% O₂) varying the configurations of a gas-washing column (without heat

exchanger with simple heat exchanger, with multi-pass heat exchanger) and the condensate

recirculation (light products) product of pyrolysis reaction. The bio-oil obtained from

experiments with gas recycling in the bed of 1.5 kg/h were subjected to deoxygenation using

5% Pt/C in a slurry bed reactor. The results showed that the gas recycling caused a 53.96%

increase in carbon content in the regular pyrolysis to 70.89% in the pyrolysis with 74%

recycle and 77.16% in the catalytic pyrolysis with in situ HZMS-5. The oxygen content

decreased from 39.64% to 21.76%. The high heating value (HHV) increased from 26.1 to

33.11 MJ/kg. Mass balance showed that 5.4 to 6.15% of the biomass was converted to CH₄,

C₂H₄, C₂H₆ and C₃H₈ with gas recycling. Regarding the liquid phase, all bio-oil samples

were rich in phenols, especially those obtained in the oxidative atmosphere. The other

components and majority functional groups are acetic acid, acetol, sugars and ketones.

MEMBROS DA BANCA:
Externo à Instituição - FRANCISCO WENDELL BEZERRA LOPES - UnP
Interno - 1547970 - JACKSON ARAUJO DE OLIVEIRA
Presidente - 350247 - JOAO FERNANDES DE SOUSA
Externo à Instituição - LAÉRCIO GOMES DE OLIVEIRA - UFCG
Externo ao Programa - 1308577 - SIBELE BERENICE CASTELLA PERGHER