Patent · US Expired

Continuous preparation of polycaprolactam in vertical tubular reactor

US4354020A · kind A · utility

9Cited by

5References

1Claims

0Family size

Assignee

BASF SE

Inventors

Rudi-Heinz Rotzoll · Schifferstadt, DE
Paul Matthies · Heidelberg, DE
Guenter Valentin · Ludwigshafen, DE
Werner Hoerauf · Ludwigshafen, DE

Key dates

Filing date	Apr 24, 1980
Grant date	Oct 12, 1982
Priority date	—
Expiry date	Apr 24, 2000

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB01J2219/185
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

A process for the continuous preparation of polycaprolactam, which comprises polymerizing .epsilon.-caprolactam in a vertical tubular reactor through which the .epsilon.-caprolactam flows downward, wherein the .epsilon.-caprolactam is partially polymerized, at a nylon-forming temperature, in a mechanically mixed zone, the reaction mixture is circulated through a heat exchange zone in the lower part of the mechanically mixed reaction zone, and is polymerized further, in additional heat exchange zones, until the desired degree of polymerization is reached, and poly-.epsilon.-caprolactam is then discharged as a melt, and an apparatus for carrying out the process.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.