3.2,Expert Experimentalist Rating:,What's With Those High-
Altitude Recipes?”
Techniques Checklist,
Glassware setup for reduced pressure distillation?
Running reduced pressure distillation?
Pre-lab Discussion,
Differences between atmospheric pressure and reduced pressure distillation
Equipment,
25-mL Round-bottomed flask
Vacuum distillation kit (distillation head,cow adaptor)
Collection flasks
Ground glass thermometer
Keck clips
Glass wool and aluminum foil
Heating mantle (w/ sand) and Variac
Goal,
To purify a mixture of two liquids by reduced pressure distillation.
Experiment Outline,
You will receive a vial containing 7.50 g of a mixture of α-ionone and octadecane,
Repeat procedure for CC level distillation using a Vigreux column and the high
vacuum line - see Distillation Guide,
O
H
3
C CH
3
CH
3
CH
3
CH
3
CH
3
a-Ionone Octadecane
(BP ~ 265 °C) (BP 317 °C)
26
WARNING NOTICE,The experiments described in these materials are potentially hazardous and require a high level
ofsafety training,special facilities and equipment,and supervision by appropriate individuals,You bear the sole
responsibility,liability,and risk for the implementation of such safety procedures and measures,MIT shall have no
responsibility,liability,or risk for the content or implementation of any of the material presented,Legal Notices
Results:
To obtain your "EE Rating" in Purification of Liquids by Distillation you must
predict the boiling points of the compounds in your mixture at 0.5 torr,You must also
obtain at least 4.00 g of α-ionone that is 93% pure or better as determined using GC
analysis,
The picture below is a nomograph,Using it and a ruler,you can determine at what
temperature a liquid will boil under vacuum,
27
Altitude Recipes?”
Techniques Checklist,
Glassware setup for reduced pressure distillation?
Running reduced pressure distillation?
Pre-lab Discussion,
Differences between atmospheric pressure and reduced pressure distillation
Equipment,
25-mL Round-bottomed flask
Vacuum distillation kit (distillation head,cow adaptor)
Collection flasks
Ground glass thermometer
Keck clips
Glass wool and aluminum foil
Heating mantle (w/ sand) and Variac
Goal,
To purify a mixture of two liquids by reduced pressure distillation.
Experiment Outline,
You will receive a vial containing 7.50 g of a mixture of α-ionone and octadecane,
Repeat procedure for CC level distillation using a Vigreux column and the high
vacuum line - see Distillation Guide,
O
H
3
C CH
3
CH
3
CH
3
CH
3
CH
3
a-Ionone Octadecane
(BP ~ 265 °C) (BP 317 °C)
26
WARNING NOTICE,The experiments described in these materials are potentially hazardous and require a high level
ofsafety training,special facilities and equipment,and supervision by appropriate individuals,You bear the sole
responsibility,liability,and risk for the implementation of such safety procedures and measures,MIT shall have no
responsibility,liability,or risk for the content or implementation of any of the material presented,Legal Notices
Results:
To obtain your "EE Rating" in Purification of Liquids by Distillation you must
predict the boiling points of the compounds in your mixture at 0.5 torr,You must also
obtain at least 4.00 g of α-ionone that is 93% pure or better as determined using GC
analysis,
The picture below is a nomograph,Using it and a ruler,you can determine at what
temperature a liquid will boil under vacuum,
27
