ABSTRACT
Coconut seeds was investigated for its use as biodiesel feedstock. Oil was
extracted from coconut seeds using soxhlet extraction method where 67.2% yield
of oil was obtained. Biodiesel synthesis was developed and optimized using
Box-Behnken design in Response Surface Methodology to study the effect of
experimental variables such as methanol to oil ratio, catalyst concentration,
reaction temperature and reaction time on the extracted oil from coconut seeds.
The model shows optimum conditions of biodiesel yield of 79% were found at 6:1
alcohol/oil ratio, 1% catalyst concentration (KOH), reaction temperature of 650C
and reaction time of 40 min. respectively. At the end of experimental design it
was found that the catalyst concentration and reaction time significantly affect the
biodiesel yield than the molar ratio among others under the range of values
studied. The produced biodiesel was analyzed for its physicochemical and
characterized for its fatty acid methyl ester (FAME) profile using GC-MS. The fuel
properties of biodiesel obtained showed that except cetane number, diesel index
and sulphur content that were higher than the recommended ASTM values all
other determined properties were within the ASTM specification indicating that its
quite suitable as an alternative source of fuel.
TABLE OF CONTENTS
Dedication………………………………………………………………………….. ii
Certification…………………………………………………………………………iii
Acknowledgement…………………………………………………………………iv
Table of Contents………………………………………………………………….v-vi
List of Tables……………………………………………………………………….vii
List of Figures………………………………………………………………………viii
Abbreviations……………………………………………………………………….ix
Abstract………………………………………………………………………………x
CHAPTER ONE
1.0 Introduction and Literature Review……………………………………….. 1
1.1 Introduction…………………………………………………………………..1
1.1.2 Biodiesel…………………………………………………………………….. 1
1.1.3 Vegetable Oils………………………………………………………………. 3
1.2 Literature Review……………………………………………………………4
1.2.1 Coconut (Cocos-Nucifera)…………………………………………………4
1.2.2 Biodiesel Production………………………………………………………..5
1.2.3 Factors Affecting Biodiesel Production…………………………………..8
1.3 Fuel Properties of Biodiesel……………………………………………….12
1.4 Environmental Consideration on use of Biodiesel……………………..15
1.5 By-products of Biodiesel……………………………………………………16
1.6 Aim and Objectives………………………………………………………….17
1.7 Scope of Work………………………………………………………………..18
1.8 Justification of study…………………………………………………………18
CHAPTER TWO
2.0 Materials and Methods………………………………………………………20
2.1 Apparatus/Instrument and Reagents………………………………………20
6
2.2 Methods……………………………………………………………………….20
2.2.1 Preparation of Reagents…………………………………………………….20
2.2.1 Sampling………………………………………………………………………21
2..2.3 Sample Preparation………………………………………………………….21
2.2.5 Oil Extraction………………………………………………………………….21
2.2.6 Determination of Percentage Yield…………………………………………22
2.2.7 Determination of Moisture Content………………………………………….22
2.2.8 Determination of Acid Value………………………………………………….23
2.2.9 Determination of Saponification Value……………………………………..23
2.2.10 Determination of Ester Value………………………………………………..24
2.2.11 Determination of Iodine Value……………………………………………….25
2.2.12 Transesterification of Oil………………………………………………………25
2.2.13 Determination of Fatty Acid Methyl Ester (Fame) of Coconut Oil Using
Gas Chromatography (GC-MS) Method………………………………….…26
2.2.14 Fuel Properties of Biodiesel (COME)……………………………………….27
2.2.15 Experimental Optimization of Biodiesel……………………………………31
CHAPTER THREE
3.0 Results and Discussion……………………………………………………..33
3.1 Results…………………………………………………………………………33
3.2 Discussion……………………………………………………………………..34
CHAPTER FOUR
4.0 Conclusion and Recommendations………………………………………..44
4.1 Conclusion…………………………………………………………………….44
4.2 Recommendations…………………………………………………………….45
References…………………………………………………………………….46
Appendices……………………………………………………………………..51
7
CHAPTER ONE
1.0 INTRODUCTION AND LITERATURE REVIEW
1.1 INTRODUCTION
The replacement of mineral fuel by biodiesel is one of the effective ways
of solving the problem of saving and effective usage of energetic resources.
Biodiesel is becoming an increasingly acceptable alternative to fossil diesel
because of narrowing gap between worldwide oil production and consumption.
Also Nigeria’s vegetation and rainfall regime support agrarian activities that can
produce feedstock for biofuel production. Sustainable biofuel production will
create more jobs and stimulate related industries thus improving the socioeconomic
industries of the country (Itodo et al., 2010).
The surge of interest in biodiesel has highlighted a number of positive
environmental effects associated with its use. These potentialities include
reduction in greenhouse gas emission, deforestation, pollution and the rate of
biodegradation (US department of energy, 2003).
1.1.1 BIODIESEL
Biodiesel is a non-petroleum based fuel made from virgin or used
vegetable oil (both edible and non-edible) and animal fat. The main sources or
biodiesel can be non-edible oils obtained from plants species available in
different countries. Direct application of vegetable oils as fuel for diesel engine is
not possible due to its higher viscosity, hence reduction of vegetable oil viscosity
12
is an urgent need. The viscosity of vegetable oils can be reduced by using
different methods, namely blending, pyrolysis, micro-emulsification and
transesterification (Peterson et al., 1991; Ma and Hanna, 1999; Muniyappa et al.,
1996). However transesterification methods have been widely used to reduce
the viscosity and improved the fuel property of vegetable oil. Transesterifiction is
the process of biodiesel production which involves the reaction of fat/oil with
alcohol in the presence of acidic, basic or enzymatic catalyst to form esters and
glycerol (Agarwal, 2007).
Biodiesel generally is an ester produced from transeseterification by
reacting vegetable oil with alcohol. It is biodegradable, non-inflammable, nontoxic
and free of sulfur and aromatics. It shows favorable combustion emission
profile producing less carbonmonoxide, sulfur oxides and unburned
hydrocarbons than petroleum based diesel. These properties make diesel a
good alternative fuel to petroleum based diesel oil (Zheng et al., 2006; Song et
al., 2000).
The properties of biodiesel can be influenced by several factors such as
fatty acid composition of the parent vegetable oil or animals fat, the quality of the
feedstock in the production process and other materials used in the process as
well as post-production materials. Biodiesel is a mixture of fatty acids with each
contributing to the properties of the fuel (Knothe, 2005). The nature of fuel
component ultimately determine the fuel properties in a particular biodiesel. The
properties of biodiesel fuel that are determined by the structure of its component
fatty esters include the following: density, viscosity, lubricity, cold flow properties
13
cloud and pour point (Knothe, 2005). Other properties that affect biodiesel fuel
properties include: flash point, specific gravity, acid number, moisture content
(Weiksner et al, 2006).
1.1.2 VEGETABLE OILS
Vegetable oil also known as triglycerides consist of glycerides, an ester
formed from glycerol molecules and fatty acids, involves straight vegetable oil
comprised of 98 percent triglycerides and small amount of mono and diglycerol.
Triglycerides are ester of three molecules of fatty acid and the glycerol which
contain substantial amount of oxygen in their structure. The fatty acids vary in
their carbon chain length and the number of double bond. A different type of oil
has different fatty acids; The empirical formula and structure of various fatty
acids present in vegetable oil are given in Table 1.1 below (Barnwal and
Sharma, 2005).
Table 1.1 Fatty Acid Composition of Triglycerides
Fatty acid Chemical name of Fatty Acid Structure
(xx.y)
Formula
Lauric Dodecanoic 12:0 C12H24O2
Myristic Tetradecanoic 14:0 C14H28O2
Palmitic Hexadecanoic 16:0 C16H32O2
Stearic Octadecanoic 18:0 C18H36O2
Arachidic Eicosonoic 20:0 C20H40O2
Behenic Docosonaic 22:0 C22H42O2
Lingnoceric Tetradecasonoic 24:0 C24H48O2
Oleic Cis-9-Octadecanoic 18:1 C18H34O2
Linoleic Cis-9,Cis-12-Octadecadienoic 18:2 C18H32O2
Linolenic Cis-9-cis-12-cis-15
Octadecatrienoic
18:3 C18H30O2
Erucic Cis-13-Dicosenoic 22:1 C32H42O2
xx- indicates number of carbon and y indicates number of double bounds in fatty
acid chain. Source – Barnwal and Sharma (2005)
14
1.2 LITERATURE REVIEW
1.2.1 COCONUT (Cocos nucifera)
The coconut Palm (Cocos nucifera), is a member of the family Arecaceae (palm
family). It is the only accepted species in the genus Cocos. The term coconut can
refer to the entire coconut palm, the seed or the fruit which botanically is a drupe
not a nut. The spelling cocoanut is an archaic form of the word. The term is
derived from 16th-century Portuguese and spanish coco, meaning “head” or
“skull”,from the three indentations on the coconut shell that resemble facial
features (Hahn, 1997).
Found throughout the tropic and subtropic area, the coconut is known for its
great versatility as seen in the many uses of its different parts, Coconuts are part
of the daily diets of many people. Coconuts are different from any other fruits
Fig 1. Coconut palm (Cocos nucifera)
15
because they contain a large quantity of “water” and when immature they are
known as tender-nuts or jelly-nuts and may be harvested for drinking. When
mature, they still contain some water and can be used as seed nuts or processed
to give oil from the kernel, charcoal from the hard shell and coir from the fibrous
husk. The endosperm is initially in its nuclear phase suspended within the
coconut water. As development continues, cellular layers of endosperm deposit
along the walls of the coconut, becoming the edible coconut “flesh”. When dried,
the coconut flesh is called copra. The oil and milk derived from it are commonly
used in cooking and frying; coconut oil is also widely used in soaps and
cosmetics. The clear liquid coconut water within is a refreshing drink. The husks
and leaves can be used as material to make a variety of products for furnishing
and decorating. It also has cultural and religious significance in many societies
that use it. (Pearsall, 1999).
1.2.1 Biodiesel production
In order for vegetable oils and fats to be compatible with the diesel engine, it is
necessary to reduce their viscosity. This can be accomplished by breaking down
triglyceride bonds, with the final product being referred to as biodiesel. There are
at least four ways in which oils and fats can be converted into Biodiesel;
1. Transesterification
2. Blending
3. Microemulsions
4. Pyrolysis.
16
Among these processes, transesterification is the most commonly used method.
The transesterification process is achieved by reaction of a triglyceride molecule
with an excess of alcohol in the presence of a catalyst to produce glycerin and
fatty esters.
The chemical reaction of base catalysed production is shown below;
H2C – OOC – R1 H2C- OH R1COOR
HC – OOC – R2 +3ROH HC – OH + R2COOR
H2C – OOC – R3 H2C- OH R3COOR
Triglycerides Methanol Glycerol Biodiesel
Where R1, R2 and R3 are long chain hydrocarbons which may be the same or
different with R = CH3
As seen above the transesterification is an equilibrium reaction in which excess
alcohol is required to drive the reaction to completion. Fortunately the equilibrium
constant favors the formation of methyl esters such that only a 6:1 molar ratio of
methanol to triglycerides is sufficient for 95-98% yield of esters (Barnwal and
Sharma, 2005). Methanol is the most commonly use alcohol because of it low
cost and choice. (Gerpen, 2005).
The following are steps involved in based catalyzed production:
Preparation: care must be taken to monitor the amount of water and free fatty
acids in the incoming oil. If the free fatty acid or water level is too high, it may
cause problems of soap formation (saponification) and the separation of the
glycerin by-product downstream.
17
Mixing of alcohol and catalyst: catalyst is dissolved in the alcohol using a
standard agitator or mixer.
Reaction: The alcohol and catalyst mix is then charged into closed reaction
vessel and the oil is added. The system from here is totally closed to the
atmosphere to prevent loss of alcohol.
The reaction mix is kept above the boiling point of alcohol (around 70⁰C) to
speed up reaction, though some researchers recommend the reaction to take
place anywhere between room temperature to 55⁰C. For safety reasons,
recommended reaction time varies from 1 to 8 hours under normal conditions the
reaction rate will double with every 10⁰C increase in reaction temperature,
excess alcohol is normally used to ensure total conversion of the fats and oils to
its esters.(Biodiesel Fuel Fact Sheet, 2006).
Separation: Once the reaction is complete, two major products are found
glycerin and biodiesel, each of the product has substantial amount of the excess
methanol that are used in the reaction. The reacted mixture is sometimes
neutralized at the step if needed. The glycerin phase is much denser than
biodiesel phase and the two can be separated by gravity with glycerin simply
drawn off the setting vessel. (Biodiesel Fuel Fact Sheet, 2006).
Alcohol removal: once the glycerin and biodiesel phase have been separated,
the excess alcohol in each phase is removed with rotary-evaporator.
18
Glycerin neutralization: the glycerin by-product contains unused catalyst and
soap that are neutralized with an acid and sent to storage as crude glycerin.
Silica gel drying: At this step, silica is added to the biodiesel obtained to remove
moisture and it is further filtered in sodium disulphide. This is usually the end of
the production process, In some system the biodiesel is distilled in an addition
step to remove small amount of color bodies to produce colorless biodiesel.
(Biodiesel Fuel Fact Sheet, 2006).
1.2.2 Factors affecting biodiesel production
The yield of biodiesel in the process of transesterification is strongly influenced
by several factors. The most important factors that influenced the yield of
biodiesel from transesterification include molar ratio of alcohol and oil, catalyst,
temperature, reaction time, presence of moisture and free fatty acid (FFA) in the
oil sample.
I. Effect of Molar Ratio: Molar ratio of alcohol plays vital role in biodiesel yield
(Leung and Guo, 2006; Zhang et al, 2003; Ma and Hanna, 1999; Freedman et
al., 1986), normally the transesterification reaction requires 3 mole of alcohol.
For 1 mole of triglycerides to 3 mole of fatty acid ester and 1 mole of glycerol.
Excess amount of alcohol increases conversion of oil into ester within a short
time. So the yield of biodiesel increases with increase in the concentration of
alcohol up to certain concentration. However, further increase of alcohol the
content does not increase the yield of biodiesel but it also increase the cost of
alcohol recovery (Leung and Guo, 2006). In addition to this, the ratio of
19
alcohol content may vary with catalyst used i.e when we use alkali catalyst
the reaction require 6:1 ratio of alcohol to oils or fats (Zheng et al, 2003).
Freedman et al. (1986) study the molar ratio (from 1:1 to 6:1) on ester
conversion with soy bean, sunflower peanut, cotton seed and the oils
behaved similarly and achieved highest conversion (93-98%) at a 6:1 molar
ratio. A ratio greater than 6:1 did not increase yield (beyond 98-99%).
However this interfered with separation of the products after the reaction.
II. Effect of Catalyst: Biodiesel formation is also affected by the type and
concentration of catalyst, catalyst are classified as alkaline, acidic or
enzymatic. Alkali catalyzed transesterification is much faster than acid
catalyzed transesterification and it is most often used commercially.
Transesterification occur approximately 4000 times faster in the presence of
alkaline catalyst than those catalyzed by the same amount of acid catalyst
(Sukumar et al., 2005). Since alkaline catalysts are less corrosive to industrial
equipment than acidic catalyst, most transesterfication reactions are
conducted with alkaline catalyst, sodium alkoxides were found to be more
effective than sodium hydroxides although the low cost of NaOH has made it
attract wide usage in large scale transesterificaton. According to Leung and
Guo, (2006), the alkaline catalyst concentration in the range of 0.5- 1% by
weight yields 94.99%. The catalyst and methanol are normally mixed first
then added to the oil or fats, in additions to this, when the concentration of the
catalyst increase with oil samples, the conversion of triglycerides into
biodiesel also increases. On the other hand insufficient amount of catalyst
20
leads to the incomplete conversion of fatty acid esters. However, optimal
product yield (biodiesel) was achieved when the concentration of NaOH
reaches 1.5 weight% at the same time, further increase of catalyst
concentration proved to have negative impact on end product yield. Because
addition of excess amount of alkali catalyst react with triglycerides to form
more soap. (Leug and Guo, 2006; Gabelman and Hwang, 1999).
Vincente et al. (2004) reported higher yield with methoxide catalysts but
the rate of reaction was highest for NaOH and lowest for KOCH3 at 650C
methanol to oil of 6:1 and a catalyst concentration of 1% weight.
III. Effect of Reaction Temperature: Reaction temperature is another important
factor that affect the yield of biodiesel. For example higher reaction
temperature increases the reaction rate and shorten the reaction time due to
the reduction in viscosity of oil. However increase in reaction temperature
beyond the optimal level leads to decrease of biodiesel yield. Higher reaction
temperature accelerate the saponification of triglycerides in the
transesterficaition reaction, temperature should be below the boiling point of
alcohol in order to prevent the alcohol evaporation.
Freedman et al. (1986) studied the transesterification of refined soy bean
oil with methanol (6:1) and 1% NaOH catalyst at three different temperatures
of 65, 45 and 32°C. After 1hour the ester formation was identical at 60°C and
45°C reaction temperatures but slightly lower at 32°C. (Agarwal, 2007). The
ranges of optimal reaction temperature may vary from 500C to 600C
depending upon the oils or fat used. (Eevera et al., 2009).
21
IV. Effect of Time: Reaction time also increases the conversion rate of biodiesel
production. Freedman et al. (1986) observed that increase in fatty acid esters
conversion occur where there is an increase in reaction time. The reaction is
slow at the beginning due to mixing and dispersion of alcohol and oil. After
that the reaction proceeds very fast. However the maximum ester conversion
was achieved in less than 90min, further increase in reaction time does not
increase the yield of product i.e biodiesel (Leung and Guo, 2006; Alamu et al,
2007). Besides longer reaction time leads to the reduction of end product
(biodiesel) due to the reversible reaction of transesterification resulting in loss
of esters as well as soap formation (Eevera et al, 2009; Ma et al, 1998).
Darnako and Cheryan (2006) observed that when palm oil was
transesterified with 1 weight% KOH at 600C and molar ratio 1:6 (oil to
methanol) it yielded 58.6% of Biodiesel at residence time of 40minutes which
increased to 97.3% at a residence time of 60minutes.
V. Effect of free fatty acid (FFA)
The presence of moisture cause partial saponification reaction which
produces soap formation and lowers the yield of esters and renders the
separation of esters and glycerol difficult. The methyl ester formed is removed
by gravity separation of the catalyst and moisture by using silica gel.
If the oil contains FFA greater than 1% more of the alkali (NaOH) is
required to neutralize the FFA which also reduces yield. The NaOH and sodium
methoxide react with moisture and CO2 in the air and these reduce their
effectiveness (Freedman et al., 1986; Agarwal, 2007).
22
The effect of FFA and water on transesterification of beef tallow with
methanol was investigated by Ma and Hanna (1999), it was concluded that the
water content of beef tallow should be kept below 0.06% w/w and FFA of the
beef should be kept below 0.5% w/w in order to get the best conversion. Water
content was a more critical variable in the transesterfication process than FFA
(Ma and Hanna, 1999).
1.3 Fuel Properties of Biodiesel
Biodiesel consist of fatty acid ester and the structure of the fatty acids in the ester
derived from the alcohol influence the fuel properties of biodiesel (Knothe, 2005).
The quality of biodiesel is important because it affects its use in internal
combustion engines. The viscosity, specific gravity, acid number, moisture
content, cloud point, pour point and flash point are properties of fatty esters that
make the overall property of biodiesel as a fuel and must meet values
established by international standards to be acceptable. (Itodo et al., 2010).
i. MOISTURE CONTENT
The presence of moisture in transport or storage tanks causes the methyl esters
in biodiesel to degrade quickly resulting in further increase in acid number.
Moisture causes the methyl ester in the biodiesel to undergo hydrolysis forming
free fatty acid. Water in a B20 blend is also soluble with any remaining methanol
and glycerin carried over from the manufacturing process. Overtime, this can
cause stratification of the fuel (Weiksner et al., 2006).
23
ii. ACID NUMBER
Acid number is a good indicator of the level of free fatty acid in biodiesel. High
tested value for acid number can be correlated to manufacturing of a fatty acid
methyl ester (FAME) fuel from unrefined feedstock (i.e high in free fatty acid)
and/or poor process control in the conversion of the feedstock oils or fat to a
FAME fuel (i.e methanol carryover). High acid level in biodiesel can cause fuel
system deposits and is another indicator that the fuel will act as a solvent
resulting in the deterioration of rubber components of a fuel system (Weiksner et
al., 2006).
iii. VISCOSITY
Viscosity is a measure of resistance to flow of a liquid. It affects the atomization
(fuel spray) of biodiesel in internal combustion engines thus affecting its
volumetric efficiency. Biodiesel is expected to have higher viscosity than petrol
diesel. Alamu et al. (2007) reported a viscosity of palm kernel oil that was 1.684
to 1.712 times that of a petrol diesel.
The recommended ASTM kinematic viscosity at 40°C for biodiesel is 4.0-6.0 (US
Department of Energy, 2003).
iv. SPECIFIC GRAVITY
The specific gravity is the most basic and important property of fuel
because it affects some important performance indicators such as the cetane
number and heating value of biodiesel. It is expected that the specific gravity of
biodiesel should be higher than that of petroleum diesel (Yuan et al., 2004).
Alamu et al. (2007) reported a specific gravity value of palm kernel oil biodiesel
24
as 1.033413 to 1.035419 times that of petrol diesel. The recommended specific
gravity of biodiesel is 0.88 (US Department of Energy, 2003).
v. COLD FLOW PROPERTIES
The cold flow properties include the cloud and the pour point. Cloud point is the
temperature at which biodiesel begins to gel while the pour point is the lowest
temperature at which the fuel can flow.
It is an important fuel storage property that affects engine performance because
it can cause clogging of the fuel system of an engine. Generally biodiesel has
higher pour point than petrol diesel (Graboski and McCornic, 1998).
vi. FLASH POINT
The flash point of biodiesel can be correlated directly with the quality of the fatty
acid methyl esters fuel (B100) usually biodiesel has low volumetric heating value
(about 12%) and high flash point. The flash point of biodiesel is between 15-25°C
higher than those of diesel fuel (Knothe, 2005). The low flash point associated
with biodiesel is caused by methanol carryover due to poor production. A blend
of B20 biodiesel will deteriorate rubber components in a fuel system (Weiksner et
al., 2006).
vii. CETANE NUMBER (CN)
The connection between the structure of fatty esters and exhaust emission
was investigated by the National Renewable Energy Laboratory (NREL) in
Golden Colorado. (Knothe, 2005). They found that high levels of saturates
(C14:0, C16:0, C18:0) raise CN reduce NOx emission and improve stability while
more polyunsaturated (C18:2, C18:3) reduce CN, raise NOx emission and
25
reduce stability. The presence of a long chain hydrocarbon in fatty acid alkyl
ester and straight chain alkanes (such as hexadecane) gives biodiesel a high
cetane number which make it suitable for use as a fuel in diesel
engines.(Knothe, 2005).
1.4 Environmental consideration on use of biodiesel
Biodiesel is considered carbon neutral because all carbon dioxide (CO2)
released during consumption is sequestered from the atmosphere by
photosynthesis via carbon cycle for the growth of energy crops (Barnwal and
Sharma, 2005). A test carried out by the United State Environment protection
Agency (USEPA) with 100% biodiesel produced from soybean oil reveled that
there was reduction in the emission of particulate matter by 40%, unburnt
hydrocarbon by 68%, carbon monoxide (CO) by 40%, Sulphur (iv)oxide (SO2) by
100%, polycyclic aromatic hydrocarbons (PAHs) by 80%, carcinogenic nitrated
PAHs by 90% on an average and in smoke capacity. This is due to the
oxygenated nature of biodiesel where more oxygen is available for burning and
reducing hydrocarbon emissions into the environment (Barnwal and Sharma
2006; ERII, 2006; Agarwal, 2007). The substitution of biodiesel for conventional
fuel contributes to the reduction of the greenhouse gases (GHGs) emission such
as CO thus helps in achieving international climate commitments. This is based
on the assumption that the combustion of biofuel is CO2 neutral because the
amount of CO2 accrued during combustion equal to the amount of that is
sequestered during crop growth (Frondal and Peterson, 2007).
26
However the use of biofuel result in slight increase in nitrogen oxide (NOx
like N2O, NO and NO2) due to high exhaust temperature which causes
stratospheric ozone depletion (Barnwal and Sharma, 2006).
1.5 By-Products of Biodiesel
Biodiesel by-product glycerin contains unused catalysts and soaps that are
neutralized with an acid and sent to storage as crude glycerin in some cases.
The salt formed during the glycerin neutralization is recovered for use as
fertilizer and sometimes the salt is left as glycerin (Biodiesel Fuel Fact Sheet,
2007). Biodiesel is used in producing pure glycerin when alcohol and water are
removed to produce 80-88% pure glycerin and can be sold as pure glycerin
(Biodiesel Fuel Fact Sheet, 2007).
The glycerin can be used in more sophistiscated operation and the glycerol is
used to distil to higher purity and sold into the cosmetics and pharmaceuticals
market (Biodiesel Fuel Fact Sheet, 2007).
27
1.7 AIM AND OBJECTIVES
This research work is aimed at ascertaining conditions for optimum yield of
biodiesel from coconut oil and to determine the viability of the seed oil as
potential source of biodiesel production.
The specific objectives of the research work include;
a To determine the percentage yield of coconut seed oil (CSO) using n-hexane
as extraction solvent.
b To determine the physicochemical properties of the coconut seed oil.
c To optimize the condition variables for biodiesel from coconut oil.
d To analyze the fatty acid methyl composition of CSO and COME.
e To determine the fuel properties of the produced COME.
28
1.8 SCOPE OF WORK
Coconut oil is an edible oil extracted from the kernel of matured coconuts
harvested from coconut palm. Because of its high saturated fat content it is slow
to oxidize thus resistant to rancidification lasting upto two years without spoiling.
Although several researchers reported works on optimization of biodiesel
production from coconut oil through transesterificaton process but not using
Response surface methodology to design and optimize result of analysis as in
this work, so the variables that affect biodiesel production the most are studied in
order to obtained the most efficient range of variables for biodiesel production..
1.9 JUSTIFICATION OF STUDY
The Nigeria’s vegetation and rainfall regime support agrarian activities that can
produce feedstock for biofuel production, also the land can be used to produce
non-food products including biodiesel for the domestic energy market to diminish
imports. Much research has been done on biodiesel over the past decades after
the oil crisis in 1973. At present, the concern about environmental regulations
has been the major reason to look for alternatives fuel.
Transesterification method have been widely used to reduce viscosity and
improve fuel properties of vegetable oil because of its low temperature and
pressure conditions also maximum conversion with no intermediate reaction. The
reaction variables that affect the transesterication process the most i.e the molar
ratio, catalyst type/concentration, temperature and time were studied using
Response surface methodology to optimize and analyze the biodiesel produce
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