Lab 7 Extraction Of Benzoic Acid

Topics: Concentration, Liquid, Mass transfer coefficient Pages: 12 (1562 words) Published: April 28, 2015

SEGi University
Extraction of Benzoic Acid
Balvinder Singh
(SCM 015 677)

Lab Partners:
1) Surrean Rao
2) Wong Kai Jun
3) Kanaga Luckshimi
4) Sasiskala Regal

ECE2332 Chemical Engineering Practices
Submitted: 1st October 2013

Mr Ayman William

1.0 Abstract /summary
The purpose of this experiment to carry out in the lab is because to determined the capability to water droplet to carry out the liquid-liquid extraction. The studies is to determine the average time travel for each of the 10 out of 50 water droplets from top of the burette and to the bottom, the average volume of each of the water droplet and the volume of NaOH needed to neutralise the benzoic acid in aqueous solution. From the volume collected for 50 droplets surface area and radius is calculated for a droplet. The uses of the surfaces area and volume help to determined the concentration of benzoic acid in kerosene, mole of benzoic acid transferred, molar flux and mass transfer coefficient.

2.0 Theoretical background
The background of these studies is to estimate and understand the extraction of benzoic acid in kerosene into carrier medium water. The water droplets are added top of the burette containing kerosene with saturated benzoic acid. Each of the water droplet added is to passes through the kerosene the surface area of the droplet is play an important role for benzoic extraction. The molar flux of benzoic acid through the interface, NB (mol/m2.s) is given by: NB = KC (C*B – CB) where C*B is the concentration of benzoic acid in kerosene at saturation, CB is the concentration of benzoic acid in the aqueous phase and KC is the mass transfer coefficient. In order to determine KC the values of NB, C*B and CB must first be known. this studies will help us to defined how the differences in mass transfer surface area will affect the molar flux and mass transfer coefficient. The burette was filled with kerosene saturated with benzoic acid Water is a benzoic acid carrier from kerosene is induced on top of the burette until to the bottom. As the water travel with time as some of the benzoic acid is extracted by water and the extracted aqueous solution is collected from burette by beaker at the bottom. As the water have higher density compared to kerosene saturated with benzoic acid. The concentration of the benzoic acid transfer into the water droplet is calculated. By using of the concentration of benzoic acid in the extract leaving the burette, the time of travel and the size of the droplets were used. This information will be useful to design industrial scale extraction units operating under same conditions.

3.0 Experimental Method
3.1 The apparatus and materials
Conical flask, pipette, burette, stirrer, dropper, beaker, stand and clamp, filter funnel, filter paper, spatula, kerosene, water, and benzoic acid.0.03M of NaOH.

3.2 Cautions
Drop the water droplet drop by drop by using dropper into the burette filled with kerosene saturated with benzoic acid. Hence, proper glove is used during the experiment.

3.3 The experiment procedures
1) The 100ml burette was filled with kerosene saturated with benzoic acid to around 5cm below the top. 2) A Pasteur pipette was filled with distilled water.
3) The pipette was positioned within 1cm of the kerosene surface. 4) The pipette was carefully squeezed to produce single droplets at a steady stream trying to maintain an equal size of the droplets and making the droplets travelling at the centre of the burette. 5) Steps 2-4 were repeated until the kerosene surface is near to the top of the burette. 6) The aqueous layer at the bottom of the burette was drained into a beaker. The amount of kerosene drained with the water was made sure to be minimized. 7) The level of the kerosene-water interface on the burette volume scale was noted down and recorded. 8) 50 droplets were...

References: 1. Factor effect the extraction of benzoic acid with water droplet surface area (viewed on30/9/2013 4:09:37 PM)
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