Continuous preparation of polycaprolactam wherein constant compo

Details Continuous preparation of polycaprolactam wherein constant compo Continuous preparation of polycaprolactam wherein constant compo

1982-08-24

1984-01-31

Anderson, Harold D.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From carboxylic acid or derivative thereof

526 67, 526 68, 526 69, 528323, C08G 6916

Patent

active

044291078

ABSTRACT:
An improved process for the continuous preparation of polycaprolactam, in which .epsilon.-caprolactam is partially polymerized, with the addition of a water-containing agent and acetic acid or propionic acid as a chain regulator, at a nylon-forming temperature, in a mechanically mixed zone in a vertical tubular reactor through which the reaction mixture flows downwards, and is then polymerized further, in additional heat exchange zones, until the desired degree of polymerization is reached, and polycaprolactam is then discharged as a melt, wherein a gaseous mixture of caprolactam, water and acetic acid or propionic acid is removed at the top of the tubular reactor and is fed to the middle of a column, water is removed at the top of the column, the bottom of the column is maintained at from 125.degree. to 145.degree. C., and the mixture obtained at the bottom of the column, and comprising caprolactam, acetic acid or propionic acid and a small amount of water, is recycled to the top of the tubular reactor.

REFERENCES:
patent: 2908666 (1959-10-01), Notarbartolo
patent: 3565866 (1971-02-01), Guenther et al.
patent: 4204049 (1980-05-01), Matthies et al.

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