ABSTRACT
In this work, Transesterification of
waste vegetable oil has been carried out using Anthill as the catalyst. Anthill
was utilized as raw material for catalyst production for biodiesel preparation.
During calcination process, the calcium carbonate content in the anthill was
converted to CaO with Al₂O₃ as the promoter and SiO₂ as the support. This calcium oxide
was used as catalyst for transesterification reaction between waste cooking oil
and methanol to produce biodiesel. The biodiesel preparation was conducted
under the following conditions: the mole ratio between methanol and palm oil
was 6:1 and with catalyst of 7wt %. The catalyst activation temperature,
reaction temperature and reaction time was varied at 600-1000°C, 60-70°C and
1-3h respectively. The maximum yield of biodiesel was 63.14%, obtained at 3h of
reaction time and 70°C. Anthill has potential application as a source of
catalyst for synthesis of biodiesel of high purity. The catalyst was obtained
by calcinations of anthill at 600-1000°C for 3h. The maximum yield of biodiesel
produced by transesterification of waste cooking oil with methanol was 63.14%.
The operating condition to achieve the maximum biodiesel yield is: the ratio of
oil to methanol 1:6, the amount of catalyst 7%, reaction time 3h, reaction
temperature 70°C.
CHAPTER ONE
1.0
INTRODUCTION
1.1 Research
Background
Currently there is an urgent need to
develop alternative energy resources, such as biodiesel fuel due to the gradual
reduction of world petroleum reserves, its economic and social concerns and the
environmental pollution of increasing exhaust emissions of harmful gases like
SOx, NOx, and Cox, coupled with the steady increase in energy consumption have
spurred research interest in alternative and renewable energy sources. A
successful substitute for diesel fuel, used mainly in the transportation
sector, was found to be the mixture of the ester derivatives from the vegetable
oils and animal fats. This new feedstock is environmental friendly, renewable,
and totally in- dependent from petroleum Biodiesel is a renewable,
biodegradable fuel that can be manufactured domestically from vegetable oils,
animal fats, or recycled restaurant grease. It is a cleaner-burning replacement
for petroleum diesel fuel. Biodiesel is defined as the mono-alkyl esters of
vegetable oils or animal fats, obtained by transesterification of oils or fats
with an alcohol, usually methanol or ethanol. The major component of vegetable
oil is triglycerides. When the triglycerides react with alcohol in the presence
of base catalyst, this is called “transesterification.” In this reaction, triglycerides
are converted to diglyceride, monoglyceride, and finally converted to glycerol.
The reaction occurs in three steps. In the first step, a triglyceride reacts
with an alcohol molecule producing a diglyceride –ester and then the
diglyceride reacts with another alcohol molecule producing a mono-glyceride and
another mono-ester, and finally, the mono- glyceride reacts with another
alcohol molecule giving glycerin and another mono-ester. (Vonortas and
Pappayanakos, 2014)
Figure 1.1. Transesterification
reaction
The parameters affecting the
transesterification reaction are temperature, molar ratio of alcohol to oil,
type and quantity of catalyst, the type of the process, and the composition of
the reactants mixture.
Catalyst is any substance that increases
the rate of a chemical reaction. Catalyst are not consumed during a reaction
therefore it is possible to recycle them. The process for producing biodiesel
use different catalyst
i. Homogenous (NaOH, KOH, H2SO4)
ii. Biocatalyst (lipases)
iii. Heterogeneous (metal hydroxides,
metal complexes and metal oxides like calcium oxide, magnesium oxide, zeolites
etc.)
Homogenous catalyst is a catalyst that
is in the same phase with the reactant while heterogeneous catalyst means that
the catalyst are in different phase with the reactant. Biocatalyst are known as
the enzyme catalyst.
It has been estimated that the cost of
biodiesel produced from virgin vegetable oil through transesterification is
higher than that of fossil fuel, because of high raw material cost. This has 3
hindered wider utilization and
commercialization of future biodiesel plant. To minimize the biofuel cost, in
recent days, cheaper feedstock such as low-grade oil, typically waste cooking
oil is being used as feedstock. The high viscosity and poor volatility are the
major limitation of using vegetable oil in diesel engines. (Paugazhabadivu et
al., 2005). Large amount of waste cooking oil is generated from eatery
establishment, restaurant and food industry etc. every year, discarding of this
oil can be of a challenge since it has the probability of contaminating the
environment. (Hubera et al., 2007). Accordingly, this research work will
focus on biodiesel production from waste cooking oil using thermally activated
anthill.
1.2 Problem Statement
Homogenous catalyst result in complex
separation and purification process steps due to its high saponification.
Catalyst gotten from anthill has never been recorded to be used in biodiesel
production based on the previous research. The competition of using edible
vegetable oil in the production of biodiesel in place of food stock has made it
a wrong choice for biodiesel production. Waste vegetable oil poses an
environmental concern in the disposal. Depletion of petroleum reserves makes
dependence on it as the only source of energy a problem.
1.3 Aim
This research project is aimed at the
investigation of anthill as a suitable catalyst for the production of biodiesel
by transesterification.
1.4 Objectives
Preparing the anthill catalyst at
varied activation temperature.
Varying the time during biodiesel
production
Varying the temperature and time of
the reaction
TOPIC: TRANSESTERIFICATION OF WASTE VEGETABLE OIL USING ANTHILL AS CATALYST
Chapters: 1 - 5
Delivery: Email
Delivery: Email
Number of Pages: 60
Price: 3000 NGN
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