ORGANIClab5 - E xperiment N o 6 Name Paul Gonzales...

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Experiment No.: Experiment Name: Date: 6 Fractional Distillation 07/09/10 Name: Course: Paul Gonzales CH 2123 1
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Purpose: to separate components of petroleum hydrocarbons using fractional distillation methods Physical Data: Mol wt. Bp D Cyclohexane 84.2 81 0.774 Toluene 92.2 111 0.867 Procedure: 1. All components of the fractional distillation apparatus must be clean and dry. Pack a distilling column uniformly with the column packing provided and measure the height of the packing in centimeters to the nearest 0.1 cm; the column needn’t be insulated. Obtain five clean, dry fraction collectors, such as a 1- dram screw-cap vial and four 4-dram screw cap vials. Label the smaller vial HETP and number the other vials from 1 to 4. Then weigh vials #1-4 with their caps on. Measure 40 mL of an equimolar mixture of cyclohexane and toluene into a 100-mL round bottom flask and add some boiling chips. Clamp the flask to a ring stand over an appropriate heat source and assemble an apparatus for fractional distillation, using the HETP vial as the receiver. 2. Heat the mixture to a gentle boil and adjust the heating rate so that the vapors rise slowly up the column. Reduce the heating rate if the column begins to flood; the packing should be moistened by condensing vapors with shouldn’t contain any flowing liquid. Distillate should begin collecting not long after
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