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Nylon Salt: Hexamethylenediamine and Adipic Acid Crystallized from Alcohol, Carothers 1938
Equal moles of hexamethylenediamine and adipic acid, warmed in watery alcohol until they dissolve, crystallize on cooling as white nylon salt (Carothers, du Pont, US 2,130,947, 1938). The salt always holds the two exactly one to one, which is what makes the nylon come out right.
The picture: our drawing of the warm flask, the crystals and the filter.
Intermediate
A day
Instructions
1
1
Weigh one mole each
Weigh one mole each
Weigh 144 g hexamethylenediamine and 174 g adipic acid: one mole of each.
Materials for this step:
Hexamethylenediamine144 g
Adipic Acid174 gTools needed:
Digital Kitchen Scale2
2
Warm to dissolve
Warm to dissolve
Put both in a flask with 1300 g of 95 % alcohol and 210 g water. Warm until everything dissolves. Keep flames away from the alcohol.
Tools needed:
Erlenmeyer Flask
Hot Plate
Ethanol - Lab Grade, 95%
Distilled Water3
3
Cool and filter
Cool and filter
Cool the solution. The salt separates as white crystals. Filter them off.
Tools needed:
Buchner Funnel (Porcelain)
Vacuum Pump4
4
Recrystallize
Recrystallize
Dissolve the crystals warm in 1300 g of 95 % alcohol and 200 g water, cool and filter again. Carothers got 247 g, melting at 183–184 °C.
Tools needed:
Erlenmeyer FlaskHot PlateEthanol - Lab Grade, 95%Distilled WaterBuchner Funnel (Porcelain)Vacuum Pump5
5
Check the balance
Check the balance
For an exact one-to-one salt, the pH of its solution sits at the turning point of the titration curve, about 7.6 for this pair.
Tools needed:
pH Meter & Titration Apparatus6
6
Moles
Moles
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Materials
2- 144 gPlaceholder
- 174 gPlaceholder
Tools Required
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