Advances in Environmental Biology

Advances in Environmental Biology, 8(14) Special 2014, Pages: 24-29
AENSI Journals
Advances in Environmental Biology
ISSN-1995-0756
EISSN-1998-1066
Journal home page: http://www.aensiweb.com/AEB/
Chemical Composition of Bio-Oil Obtained from Biomass via Thermal Controlled
inside The Continuous Pyrolysis Reactor
1,2Kittiphop
Promdee, 2Ornrumpha Soubsawwong, 2Chintana Sanvong, 1,3 Tharapong Vitidsant
1
Center of Fuels and Energy from Biomass, Chulalongkorn University, Saraburi 18110, Thailand,
Department of Environmental Science, Academic Division, Chulachomklao Royal Military Academy, Nakorn Nayork, 26001, Thailand,
3
Department of Chemical Technology, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand
2
ARTICLE INFO
Article history:
Received 25 June 2014
Received in revised form
8 July 2014
Accepted 14 September 2014
Available online 27 September 2014
Keywords:
Pyrolysis Bio-oil
Cogongrass Product yields
Chemical compositions
ABSTRACT
Background: This study examines the thermal pyrolysis of biomass [Cogongrass] for
synthesis of bio-oil. The thermal pyrolysis was conducted at three different
temperatures, 400, 450 and 500°C and the bio-oil obtained from Cogongrass was
analysed for its chemical composition. Cogongrass can be categorized as providing
moderate bio-oil yields, between 30-40%, composed of hydrocarbon compounds in the
hydroxyl and carboxyl groups, especially; phenols [23.56%], Phenol, 2,6dimethoxy[15.62%], Phenol, 2-methoxy-[3.67%], Phenol, 3-methyl-[4.52%], Phenol, 2methyl-[4.02%],Benzene,1-ethyl-4-methoxy-[2.75%], alcohols and ketones. In the
present work, which was concerns the feeding rate, the temperatures in reactor and the
metal ball heat contact reaction for the hi quality of bio-oil with Cogongrass.
© 2014 AENSI Publisher All rights reserved.
To Cite This Article: Kittiphop Promdee, Ornrumpha Soubsawwong, Chintana Sanvong, Tharapong Vitidsant., Chemical Composition of
Bio-Oil Obtained from Biomass via Thermal Controlled inside The Continuous Pyrolysis Reactor. Adv. Environ. Biol., 8(14), 24-29, 2014
INTRODUCTION
Bio-Oil is now known for having the potential to provide the projected renewable energy provisions of the
future as biofuels in form of gas, liquid and solid and heat emission in the our of reactor system [1-5].
Biomass can be treated in numerous ways to produce liquids, solids and gases, but one of the technologies that
have the best industrial perspectives is pyrolysis, with challenges in the efficient conversion of biomass to fuels
compatible with internal engines or reactor [6-8]. Pyrolysis process becomes an option for the thermo chemical
conversion of cellulose, hemicelluloses and lignin of biomass into liquid fuels because this process can increase yield
of condensable liquid oil quality.
Natural tissue [Biomass] from photosynthesis is converted to bio-oil and hydrocarbon by pyrolysis showed
in following equations [9,10]:
sunlight
nCO2  mH2O 
 Cn (H2O)m  nO2
H  470 KJ / mol
H
 Char + Pyrolytic oil high and moderate molecule weight organic liquid [+ other
Biomass 
Phrolysis
H
condensable in oxygenate organic + CO2+CO+H2+CH4+H2O+other organic liquid 
 Aromatic
organic+low molecule weight organic liquid + Char + CO2+CO+H2+CH4+H2O+other.
This research was conducted using Cogongrass transformed to bio-oil by continuous pyrolysis reactor on
standard criteria and analysis the properties of material and products. At present, the fuel is becoming a
concerned in every country [11]. Now we are looking at the fuel which synthesized from natural matters,
especially; weeds biomass [12,13], such as Cogongrass, using the pyrolysis method combined with the control
of the temperature balance in the continuous pyrolysis reactor. The fuels from natural matters have a good
solved product and can reduce a waste in widespread areas of central part of Thailand.
Continuous pyrolysis reactor is one of excellent technologies for synthesized bio-oil [14]. In this case we
want to produce bio-oil in high potential performance of yield and properties by applying the heat transfer
model for control criteria of reactor to generate the alternative energy source [15]. The efficiency of this
research depended on the rounded rocks and twin screw feeder in continuous pyrolysis reactor for
generated bio-oil from Cogongrass.
MATERIALS AND METHODS
Corresponding Author: Kittiphop Promdee. Center of Fuels and Energy from Biomass, Chulalongkorn University,
Saraburi 18110, Thailand,
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Kittiphop Promdee et al, 2014
Advances in Environmental Biology, 8(14) Special 2014, Pages: 24-29
Feedstock and Experimental Set-up:
The Cogongrass sample is chopped and crushed before being placed in an oven at 100°C for approximately
2 h until the moisture content is below 5%. The sample is then passed through a sieve to obtain particle sizes of
approximately 0.1-1 mm. It is then fed into continuous reactor [Fig. 1], for pyrolysis at the following operating
conditions: Operating temperature 400-500°C, The bio-oil product was analysed by Ultimate analyser and Proximate
analyser for characteristics and elemental composition before calculating the received oil yields. Further analysis of
the chemical compounds found in the bio-oil product was carried out using Gas Chromatography with Mass
Spectrometer.
The received oil yield can be calculated by following formula:
W 
%Liquid yield  100  Liq 
 Wini 
W 
%Solid yield  100  R 
 Wini 
% Gas yield = 100-% Liquid yield-% Solid yield
Wini = Initial weight
WR = Residual solid weight
WLiq = Liquid product weight
The received oil yield of solid phase implies the amount of solid left after pyrolysis and was determined
gravimetrically, the gas phase was calculated as remaining after quantification of the solids and liquids phase.
Chemical Analysis:
Gas Chromatography with Mass Spectrometer, GC-MS was used to analyze the light components in bio-oil
and investigating the molecular compositions qualitatively [15,16]. The analyses detect and identify organic
compounds both aliphatic hydrocarbon and aromatic hydrocarbon of bio-oil from Cogongrass. The pyrolysis
product was directly injected into Gas Chromatograph [GC] system through the pyrolysis interface line. The GC
was equipped with a thermal conductivity detector and Mass Spectrometer [MS] detector [16]. The injection
temperature was 300°C and a split ratio of 50:1 was used. Pyrolysis vapors comprising condensable gases i.e.
bio-oil, acetic acid and water were classified as liquid [15,16]. A total of over 100 compounds were detected.
Fig. 1: Schematic diagram of pyrolysis reactor setup: [1] Continuous pyrolysis reactor [2] Hopper; 2.2 Biomass
Hopper 2.2 Rounded rocks Hopper [3] Charcoal tank [4] Condenser [1 5] Condenser [2 6] Gases
storage [7] Cooling tower [8] Bio-Oil stock [9] Bio-Oil and Gasses Recovering in the system [10]
Cooling pump
RESULTS AND DISCUSSION
Compositions of Cogongrass:
Preliminary investigation of tissue components of Cogongrass, shown in Table 1., reveals it to be mainly
composed of Holocellulose and lignin at 59.38 and 39.45 wt%, respectively. The Holocellulose can be further
separated into 2 categories; 27.96 wt% Alfa-Cellulose and 31.42 wt% Hemicellulose. Results from proximate
analysis and ultimate analysis can be seen in Table 2. Proximate analysis shows low moisture content, low
amount of ash, moderate amount of fixed carbon and high amount of volatiles. This hints at the potential of
Cogongrass as a raw material for high efficiency bio-oil synthesis.
Table 1: The tissue components of cogongrass.
26
Kittiphop Promdee et al, 2014
Advances in Environmental Biology, 8(14) Special 2014, Pages: 24-29
Tissue components
Holocellulose
Alfa-Cellulose
Hemicellulose
Lignin
[wt%]
59.38
27.96
31.42
39.45
Table 2: Proximate analysis and ultimate analysis of cogongrass.
Proximate
analysis
[wt.%]
Moisture
5.2
Ash
10.3
Volatiles
63.3
Fixed carbon
21.2
Trace elements
Ultimate
analysis
C
H
N
O
S
[wt.%]
43.87
8.20
4.60
37.92
2.19
3.22
The thermal control of experiment was founded that the high temperature in central of the reactor. Thus; the
thermal control and operation in continuous pyrolysis reactor showed that the trend of thermal in Fig. 2. T2
founded that thermal was slightly increasing between 100 to 700°C in 15 to 60 min, difference from T1 and T3
showed that thermal were low slightly increasing between 100 to 500°C in 15 to 60 min and low temperature
than that T2.
Results from proximate analysis and ultimate analysis can be seen in Table 2. Proximate analysis
shows low amount of ash, moderate amount of fixed carbon and high amount of volatiles. This hints at the
potential of Cogongrass as a raw material for high efficiency bio -oil synthesis.
Fig. 2: The thermal controlled and operated in continuous pyrolysis reactor.
The ultimate analysis of Cogongrass determined the proportion of the elements as following; carbon,
hydrogen, nitrogen and oxygen were 43.87, 8.2, 4.6 and 37.92 wt%, respectively [Table 2]. This proportion is similar
to the results from hazelnut cupulae with carbon, hydrogen, nitrogen and oxygen of 51.15, 5.89, 2.12 and 40.84 wt%
respectively [17] and indicates that the obtained pyrolytic oil from Cogongrass may be used as a renewable fuel and
chemical feed stock.
Chemical compound of bio-oil by continuous pyrolysis process
The compounds detected in bio-oil from Cogongrass showed that the hydrocarbon compounds composed of
hydroxyl and carboxyl groups, including; phenols [23.56%], Phenol, 2,6-dimethoxy[15.62%], Phenol, 2methoxy-[3.67%], Phenol, 3-methyl-[4.52%], Phenol, 2-methyl-[4.02%], Benzene, 1-ethyl-4-methoxy-[2.75%],
alcohols and ketones.
These chemical compounds showed in investigating the molecular compositions in Fig. 3, detecting
compounds of bio-oil from several biomass [18,19]. However; the compounds detected in bio-oil from
Cogongrass as similar results were reported by the topics; Formation of aromatic structures during the
pyrolysis of bio-oil [18] and Selective production of light oil by biomass pyrolysis with feedstock mediated recycling of heavy oil [19,20]. These results show agreement between proposed model and
experimental data of the several biomass [plant matters] lead to pyrolysis process.
All of compounds can be detected in bio-oil obtained from Cogongrass showed the main groups of
hydrocarbon compounds, there are composed of hydroxyl and carboxyl groups. These compounds showed that
the investigating molecular compositions.
It’s have been detected compounds of bio-oil from several biomass [21,22], the results shown a good
samples of molecular compositions detected [Table 3.].
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Kittiphop Promdee et al, 2014
Advances in Environmental Biology, 8(14) Special 2014, Pages: 24-29
Fig. 3: The amount of some molecule compounds bio-oil obtained from Cogongrass.
Table 3: Compounds detected in bio-oil obtained from Cogongrass
Compound
Benzene, 1-ethyl-4-methoxy1,2-Cyclopentanedione, 3-methyl2-Cyclopenten-1-one, 2,3-dimethylPhenol
Phenol, 2,3-dimethylPhenol, 2,4-dimethylPhenol, 2,5-dimethylPhenol, 2,6-dimethoxyPhenol, 2,6-dimethylPhenol, 2-ethylPhenol, 2-methoxyPhenol,2-methoxy-4-[1-propenyl]-, [E]Phenol, 2-methoxy-4-methylPhenol, 2-methoxy-4-propylPhenol, 2-methylPhenol, 3,4-dimethylPhenol, 3-methylPhenol, 4-ethylPhenol, 4-ethyl-2-methoxyButanoic acid, 4 – hydroxylButyrolactone
2- Cyclopenten-1- one, 2-Methyl
2- Cyclopenten-1- one, 3-Methyl
3-Methyl- Cyclopentenone
3-Methyl-2- Cyclo
2,4- Dimethylfuran
3,4- Dimethyl
Phosphonic acid
4- Hydroxybenzenephosphonic acid
2,3- Dimethyl-2-Cyclopenten-1-one
2,3- Dimethyl
Mequinol
*can not determined
× determined
Formula
C9H12O
C6H8O2
C7H10O
C6H6O
C8H10O
C8H10O
C8H10O
C8H10O
C8H10O
C8H10O
C7H8O2
C10H12O2
C10H12O2
C10H12O2
C7H8O
C8H10O
C7H8O
C8H10O
C9H12O2
C4H8O3
C4H6O2
C6H8O
C6H8O
C6H8O
C6H8O
C6H8O
C7H10O
C6H7O4P
C6H7O4P
C7H10O
C7H10O
C7H8O2
MW
136.00
112.12
110.00
94.11
122.16
122.16
122.16
122.16
122.16
122.16
124.00
164.19
164.19
164.19
108.13
122.16
108.13
122.16
152.18
104.00
86.00
96.00
96.00
96.00
96.00
96.00
110.00
174.00
174.00
110.00
110.00
124.00
Detection
*
×
×
×
×
×
×
×
×
×
×
×
×
×
×
×
×
×
×
*
*
×
×
×
*
*
×
×
*
*
×
*
28
Kittiphop Promdee et al, 2014
Advances in Environmental Biology, 8(14) Special 2014, Pages: 24-29
Conculsion:
The continuous pyrolysis reactor for produce bio-oil from Cogongrass showed that the high thermal in
central of the reactor and thermal controlled between 0-500°C within 60 min. The compounds detected in biooil from Cogongrass showed that the hydrocarbon compounds that were composed of hydroxyl and carboxyl
groups, especially; phenols, Phenol, 2,6-dimethoxy, Phenol, 2-methoxy-, Phenol, 2-methyl-, Benzene, 1-ethyl-4methoxy-, alcohols and ketones. Thus, in this research, the process of continuous pyrolysis depended on the
mechanism of heat transfer with the shape of coil screw and rounded rocks and concern that the overall
performance system of the continuous pyrolysis reactor for produce bio-oil.
ACKNOWLEDGMENT
This work was supported by the Higher Education Research Promotion and National Research University
Project of Thailand, Office of the Higher Education Commission [EN 272 A], Ratchadaphiseksomphot
Endowment Fund [CU-CLUSTER-FUND], the Thai Government Stimulus Package 2 [TKK2555] under the
Project for Promotion of bio and biomass utilization potential for fuel production and exporting technology, and
Chulalongkorn University and Research Program on Materials for Future Energy, Center of Excellence on
Petrochemical and Materials Technology.
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