Continuous preparation of polycaprolactam and apparatus for...

C - Chemistry – Metallurgy – 08 – G

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402/229, 23/378

C08G 69/16 (2006.01) B01J 19/18 (2006.01)

Patent

CA 1150445

ABSTRACT OF THE DISCLOSURE: The present invention is directed to a process for the continuous preparation of polycaprolactam which comprises: passing .epsilon.-caprolactam in the presence of water as an initiator downwardly through a vertical tubular reactor, wherein the .epsilon.-caprolactam is partially polymerized at a temperature of from 245 to 260°C in a mixing zone equipped with a mechanical stirrer, which zone has a diameter which is 30 to 80% greater than that of the balance of the tube, circulating the polymer- izing caprolactam melt through a heat exchange zone located at a distance from the stirrer which is 0.3 to 1.5 times the diameter of the narrower part of the tube, in the lower part of the mechanically mixed reaction zone, passing the melt through additional heat exchange zones at a temperature of from 240 to 290°C, wherein the desired degree of polymerization is reached, and thereafter discharging poly-.epsilon.-caprolactam as a melt from the tubular reactor.

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