RESULT

Table 7.1 Data Collection for Experiment APower(kW)Time(s)Boil-up Rates(L/h)Pressure DropDegree of Foaming

TopBottomOverall

0.51190.0451629468Gentle Localised

0.75400.1351698782Violent Localised

1.0060.92500250Foaming Gently

1.2551.0818572113Foaming Gently

1.5041.3520355148Violent Localised

Graph 7.1 Graph of Pressure Drop versus Boil-up Rate

Table 7.2 Data Collection for Experiment BConcentrationRI (nD)

100%1.42342

75%1.43552

50%1.45506

25%1.47832

0%1.49665

Graph 7.2 Graph of Refractive Index versus Mole Fraction of Methylcyclohexane

SAMPLE OF CALCULATIONTo calculate the volume needed for methylcyclohexane and toluene

Molecular Weight of Methylcyclohexane, = 98.19Molecular Weight of toluene, = 92.15Density of methylcyclohexane, = 0.774 g/mLDensity of toluene, = 0.867 g/mL

Substituting these values into the equation,

Thus, the volume needed for 100 mL mixture with 25 mole percent of toluene is28.49 mL methylcyclohexane71.51mL tolueneDISCUSSION Distillation is a process in which a liquid or vapor mixture of two or more substances is separated into its component fractions of required boiling point, by the application and removal of heat. Distillation is a commonly used method for purifying liquids and separating mixtures of liquids into their individual components.Based on the result obtained from Experiment A, the pressure drop is increased with the increasing value of reboilers power but then it decreases after the fourth reading. According to the graph plotted for experiment A, the pressure drop is decreased from boil up rate 1.08 to 1.35 L/h and increased from boil up rate 0.045 to 0.9 L/h. The boil up rate is recorded by using the stopwatch while 90 mL of samples is being collected. The boil up rate of the samples at 0.5 kW is 0.045 L/h while at 0.75 kW the boil up rate is 0.135 L/h. At 1.00 kW of reboiler power, the boil up rate is 0.9 L/h and at 1.25 kW the boil up rate is 1.08 L/h. For 1.50 kW, the boil up rate is 1.35 L/h. As for the degree of foaming, at 0.5 kW the degree of foaming is observed as gentle localised. At 0.75 kW, the degree of foaming is Violent Localised. The degree of foaming for 1.00 kW and 1.25 kW is observed as Foaming Gently. At 1.50 kW reboiler power, the degree of foaming is changed to Violent Localised over the whole tray.