PREPARATION OF BIODIESEL FROM KARANJA OIL(part 13)

The optimum temperature for efficient conversion of vegetable oil to biodiesel was identified to be about 51°C-55°C. The heating system required for this purpose was required to maintain a constant temperature in the above mentioned range. The heating system was designed to be a closed loop feedback system which could maintain a required temperature so that the reaction conditions can be maintained as needed. A thermostat control is used to maintain constant temperature.

The system was designed with an electric heating coil, a temperature controller and a sensor. The ideal location for the sensor was identified to be on the flange of the closed reactor. This would allow for the measurement of temperature near the liquid surface so that temperature gradient does not affect the temperature reading. The heating coil is placed ideally to provide uniform heating.

The heating coil is connected to the temperature controller through a relay. The temperature sensor provides feed back to the controller and allows a present temperature to be maintained.

PROPERTIES OF METHYL ESTERS

The properties of methyl esters produced were measured using respective standard techniques. It was found that the properties of the methyl esters satisfy Indian standards (IS 15607:2005) for Biodiesels. The Properties of oil ,methyl esters, diesel and Indian Standards for biodiesel are listed in T able .1 & 2

The photographs of neat oil and the corresponding methyl esters (biodiesel) are shown in Figures.7 & 8

Table 1. Properties of oil before esterification

Property Karanja oil
Density (Kg/m2) 991
Kinematic viscosity c.stokes 69.6
Flash point(0c) 241
Fire point (0c) 253
Heating Value KJ/Kg 34000
Specific gravity 0.912

Table 2. Properties of oil After esterification

Property Karanja Methyl Esters Diesel IS for Biodiesel
Density (Kg/m2) 885 836 860-900
Kinematic viscosity c.stokes 5.60 3.8 2.5-6
Flash point(0c) 217 56 120
Fire point (0c) 223 63 130
Heating Value KJ/Kg 36120 42800 37270
Specific gravity 0.876 0.85 0.86-0.90

Fig7Preparation Of Biodiesel_decrypted
Fig: 7 Karanja oil
Fig:8 Biodiesel from karanja oil

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