公开(公告)号：DE2242641A1

公开(公告)日：1974-04-11

申请号：DE2242641

申请日：1972-08-30

Applicant: BASF AG

Inventor： KISSEL ERNST DIPL ING ,  NEUMANN ECKART DIPL ING ,  GUENTHER ERNST DIPL ING ,  VALENTIN GUENTER ,  HOERAUF WERNER DR

IPC: C08G69/00 ,  B01D11/02 ,  C08G69/46 ,  C08J9/26 ,  C08G20/42

Abstract: The continuous countercurrent extraction of polylactam granules with hot water in an extraction zone for the removal of monomer and/or oligomers, the extraction zone being subdivided into subzones by at least one heating zone. The density of the extract-containing water differs by at least 0.0002 between the subzones.

公开(公告)号：DE2530304A1

公开(公告)日：1977-01-20

申请号：DE2530304

申请日：1975-07-08

Applicant: BASF AG

Inventor： DIETRICH ERNST ,  GUENTHER ERNST DIPL ING ,  HOERAUF WERNER DIPL ING ,  KISSEL ERNST DIPL ING ,  LINGE HERMANN DR ,  NEUMANN ECKART DIPL ING ,  SCHAEFER EBERHARD

IPC: C08G69/00 ,  B29B13/06 ,  F26B17/14 ,  F26B21/14 ,  B29B3/04

Abstract: A vertical cylinder for drying and heating granules which includes an inlet at the top of the cylinder, a conically tapered outlet at the bottom of the cylinder, a rotatable screening ring beneath the inlet, a chute beneath the screening ring and a scraper above the ring inlets for gases in the downward extending section of the cylinder, a shell and tube heat exchanger located coaxially in the bottom quarter of the cylinder, a horizontally movable grid as flow control device below the heat exchange and a discharge zone below the grid.

公开(公告)号：DE2242642A1

公开(公告)日：1974-04-11

申请号：DE2242642

申请日：1972-08-30

Applicant: BASF AG

Inventor： NIESWANDT WERNER DR ,  HOERAUF WERNER DR ,  GUENTHER ERNST DIPL ING ,  KISSEL ERNST DIPL ING ,  NEUMANN ECKART DIPL ING ,  VALENTIN GUENTER

IPC: C08G69/00 ,  B01D11/02 ,  C07D201/12 ,  C08G69/46 ,  C08G20/42

Abstract: Continuous extraction of polylactam granules for the removal of monomers and/or oligomers therefrom by means of hot water flowing countercurrently in an extraction zone, which extraction zone is divided into subzones by at least one heating zone and the water is accelerated, at certain time intervals, cocurrently and countercurrently to the flow of granules.