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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.
中级
A day
说明
1
1
Weigh one mole each
Weigh one mole each
Weigh 144 g hexamethylenediamine and 174 g adipic acid: one mole of each.
此步骤所需材料：
己二胺144 克
己二酸174 克所需工具：
数字厨房秤2
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.
所需工具：
锥形瓶
电热板
乙醇——实验级，95 %
蒸馏水3
3
Cool and filter
Cool and filter
Cool the solution. The salt separates as white crystals. Filter them off.
所需工具：
布氏漏斗（瓷制）
真空泵4
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.
所需工具：
锥形瓶电热板乙醇——实验级，95 %蒸馏水布氏漏斗（瓷制）真空泵5
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.
所需工具：
pH 计与滴定装置6
6
Moles
Moles
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