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    Extraction of polylactams
    2.
    发明授权
    Extraction of polylactams 失效
    聚内酰胺的提取

    公开(公告)号：US3905946A

    公开(公告)日：1975-09-16

    申请号：US39224473

    申请日：1973-08-28

    Applicant: BASF AG

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

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

    CPC classification number: C08G69/46

    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.

    Abstract translation: 连续提取多内酰胺颗粒以通过在提取区域中逆流流动的热水从其中除去单体和/或低聚物，该提取区通过至少一个加热区被分成次区域，并以特定的时间间隔加速水 与流动的流动并流逆流。

    POLYMERIZATION OF '-CAPROLACTAM
    4.
    发明专利
    POLYMERIZATION OF '-CAPROLACTAM 未知

    公开(公告)号：CA1076743A

    公开(公告)日：1980-04-29

    申请号：CA266548

    申请日：1976-11-25

    Applicant: BASF AG

    Inventor： MATTHIES PAUL ,  KUNDE JOACHIM ,  HOERAUF WERNER

    IPC: C08G69/00 ,  C08G69/16

    Abstract: O.Z. 31,765 An improved process for the continuous polymerization of .epsilon.-capro-lactam in the presence of water as initiator in a vertical downward-flow tubular reactor, in which the .epsilon.-caprolactam is partially polymerized at elevated temperature in a first, mechanically agitated reaction zone and is further polymerized in further reaction zones to the desired degree of polymerization. Poly-.epsilon.-caprolactam is discharged in the form of a melt. The polymerization is carried out at a gauge pressure of from 0.2 to 0.9 bar, constant in all reaction zones. The temperature in the first reaction zone is from 260 to 295.degree.C whilst obeying the condition t ? 265 + 43 p .degree.C, wherep is the numerical value of the gauge pressure in bars.

    PRODUCTION OF AQUEOUS SUSPENSIONS OF FINELY DIVIDED TITANIUM DIOXIDE
    7.
    发明专利
    PRODUCTION OF AQUEOUS SUSPENSIONS OF FINELY DIVIDED TITANIUM DIOXIDE 未知

    公开(公告)号：CA1187852A

    公开(公告)日：1985-05-28

    申请号：CA406727

    申请日：1982-07-06

    Applicant: BASF AG

    Inventor： BELDE HORST ,  LANGENFELDER HANS ,  HOERAUF WERNER

    IPC: C09D17/00 ,  B01F17/22

    Abstract: Aqueous suspensions of finely divided titanium dioxide are produced in the presence of dispersants by a process in which titanium dioxide powder and caprolactam are kneaded together in the dry state at from 15 to 40.degree.C, the resulting mixture is kneaded with the addition of water, the paste thus obtained is suspended in water, the suspension is then allowed to sediment, and the resulting suspension containing finely divided titanium dioxide is decanted.

    EXTRACTION TUBE FOR POLYAMIDES
    8.
    发明专利
    EXTRACTION TUBE FOR POLYAMIDES 未知

    公开(公告)号：CA1066030A

    公开(公告)日：1979-11-13

    申请号：CA218338

    申请日：1975-01-21

    Applicant: BASF AG

    Inventor： HOERAUF WERNER ,  GUENTHER ERNST ,  KISSEL ERNST ,  VALENTIN GUENTER ,  DIETRICH ERNST

    IPC: C08G69/00 ,  B01D11/00 ,  B01D11/02 ,  C08G69/04 ,  C08G69/46 ,  B01J8/08

    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 upper inlet surfaces leading into each duct on the upper side of said heat exchanger facing the stream of granules, said inlet surfaces being inclined to taper inwardly toward the vertical ducts at 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.degree., further similar heat exchangers being provided beneath said heat exchanger if desired.

    CONTINUOUS PREPARATION OF POLYCAPROLACTAM AND APPARATUS FOR CARRYING OUT THIS PROCESS
    10.
    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.

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