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    CONTINUOUS PREPARATION OF POLYCAPROLACTAM AND APPARATUS FOR CARRYING OUT THIS PROCESS
    11.
    发明专利
    CONTINUOUS PREPARATION OF POLYCAPROLACTAM AND APPARATUS FOR CARRYING OUT THIS PROCESS 未知

    公开(公告)号：CA1150445A

    公开(公告)日：1983-07-19

    申请号：CA350012

    申请日：1980-04-16

    Applicant: BASF AG

    Inventor： ROTZOLL RUDI-HEINZ ,  MATTHIES PAUL ,  VALENTIN GUENTER ,  HOERAUF WERNER

    IPC: C08G69/00 ,  B01J19/18 ,  C08G69/04 ,  C08G69/16

    Abstract: 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.degree.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 polymerizing 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.degree.C, wherein the desired degree of polymerization is reached, and thereafter discharging poly-.epsilon.-caprolactam as a melt from the tubular reactor.

    12.
    发明专利
    未知

    公开(公告)号：DE2404510A1

    公开(公告)日：1975-08-14

    申请号：DE2404510

    申请日：1974-01-31

    Applicant: BASF AG

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

    IPC: C08G69/00 ,  B01D11/00 ,  B01D11/02 ,  C08G69/04 ,  C08G69/46

    Abstract: An extraction tube for the continuous removal of low molecular weight components of polylactam granules by means of hot water by the countercurrent principle of operation, the water being fed upwardly and the granules downwardly, the tube being provided with inlets and outlets for the granules and the water and exhibiting baffles within the tube, wherein there is provided, within the tube, a heat exchanger which A. DIVIDES THE TUBE INTO TWO SECTIONS BEARING A RATIO TO EACH OTHER OF FROM 50:50 TO 85:15 BY VOLUME, THE SMALLER SECTION BEING AT THE TOP OF THE TUBE, B. EXHIBITS DUCTS FOR THE GRANULES OVER THE ENTIRE CROSS-SECTION OF THE TUBE AND C. HAS TOP SURFACES FACING THE STREAM OF GRANULES, WHICH SURFACES ARE INCLINED TOWARD THE DUCTS TO AN ANGLE beta TO THE HORIZONTAL, THIS ANGLE BEING EQUAL TO OR GREATER THAN THE ANGLE OF REPOSE OF THE GRANULES BUT LESS THAN 90 DEG , FURTHER SIMILAR HEAT EXCHANGERS BEING PROVIDED BENEATH SAID HEAT EXCHANGER IF DESIRED.

    PRODUCTION OF CONCENTRATES OF TITANIUM DIOXIDE IN POLYCAPROLACTAM
    14.
    发明专利
    PRODUCTION OF CONCENTRATES OF TITANIUM DIOXIDE IN POLYCAPROLACTAM 未知

    公开(公告)号：CA1180834A

    公开(公告)日：1985-01-08

    申请号：CA404707

    申请日：1982-06-08

    Applicant: BASF AG

    Inventor： STREHLER HUGO ,  HOERAUF WERNER ,  VALENTIN GUENTER

    IPC: C08J3/22 ,  C08K3/22 ,  C08L77/02 ,  C09D17/00 ,  C08J3/20

    Abstract: The invention relates to a process for the production of a concentrate of from 20 to 50% by weight of titanium dioxide in polycaprolactam, wherein a 5 - 15% strength by weight aqueous suspension of titanium dioxide is metered into a solution of caprolactam in water at from 110 to 150.degree.C at the same rate at which water is distilled off, and after all the water has been distilled off the resulting mixture is polymerized at from 240 to 280.degree.C. This process allows to obtain concentrates of titanium dioxide, which have a long shelf life and a constant concentration, can readily be dispersed in the caprolactam or polycaprolactam melt, and in addition, owing to the omission of water, do not adversely affect the capacity of the polymerization plant.

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