Phosphoric Acid → Dodecanedioic acid, compd. with 1,6-hexanediamine (1:1)

Participants

Reaction Conditions

Reaction Steps

1.0 kg of ε-caprolactam, 1.0 kg of 12-aminododecanoic acid and 200 g of fluoromica (average particle size 8 μm, CEC corresponding to 0.14 mole) was added to 1 kg of water. Into a 30 L volume reactor which was in advance charged with 8 kg of ε-caprolactam were introduced the above-described mixture and 16.1 g (0.14 mole) of 85 wt % phosphoric acid aqueous solution. The temperature and the pressure were then elevated to 260° C. and 5 kg/cm2, respectively. The reaction system was maintained at a temperature of 260° C. and a pressure of 5 kg/cm2 for 2 hours to conduct polymerization while gradually releasing steam, followed by pressure release to atmospheric pressure over a 1 hour period. After standing under conditions of atmospheric pressure and 260° C. for 40 minutes, the reaction mixture was withdrawn in strands, cooled to solidify, and cut to obtain pellets of nylon 6/12 resin composition.

Provenance & Evidence