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    PROCESS AND APPARATUS FOR ACHIEVING A UNIFORM FLOW PROFILE
    11.
    发明专利
    PROCESS AND APPARATUS FOR ACHIEVING A UNIFORM FLOW PROFILE 未知

    公开(公告)号：CA1083012A

    公开(公告)日：1980-08-05

    申请号：CA247615

    申请日：1976-03-10

    Applicant: BASF AG

    Inventor： HOERAUF WERNER ,  PIRZER HANS ,  GUENTHER ERNST ,  NEUMANN ECKART ,  DIETRICH ERNST

    IPC: F15D1/02 ,  F16K47/00

    Abstract: A process and apparatus for achieving a uniform flow profile of very viscous liquids when flowing through a tube or reaction chamber. The very viscous liquid is passed through at least two sets of annular spaces arranged at axial intervals within the tube or reaction chamber, the annular spaces of each set extending concentrically with increasing diameter over the entire cross-section of the tube or reaction chamber and having the same depth in the direction of flow, the annular spaces of two consecutive sets being staggered with respect to each other as viewed in the direction of flow. The apparatus of the invention consists of a combination of two or more discs arranged at axial intervals within a tube transversely to the direction of flow, each disc consisting of a plurality of ring-shaped bands of increasing diameter, the bands being arranged freely of one another and concentrically at intervals on a grid supporting means to provide correspondingly concentric open spaces between the bands over the entire cross-section of the tube, with the walls of the bands running parallel to the direction of flow, and the bands of the separate discs being staggered with respect to each other as viewed in the direction of flow.

    PROCESS AND APPARATUS FOR DRYING AND HEATING NYLON GRANULES
    12.
    发明专利
    PROCESS AND APPARATUS FOR DRYING AND HEATING NYLON GRANULES 未知

    公开(公告)号：CA1079959A

    公开(公告)日：1980-06-24

    申请号：CA255180

    申请日：1976-06-17

    Applicant: BASF AG

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

    IPC: C08G69/00 ,  B29B13/06 ,  F26B17/14 ,  F26B21/14 ,  F26B17/12

    Abstract: In a process for drying and heating nylon granules, in which the granules flow downwards through a vertical zone, hot inert gases which are free from molecular oxygen are passed in counter-current through the granules and the cooled granules are then intermittently discharged in part-streams, the improvement wherein the wet granules, or a suspension of the granules in water, are fed into the zone at the top, the granules are deposited as a layer, the water is led away, the layer of granules is then transferred into the next-lower part of the zone, the granules are there allowed to flow under gravity downwards through the zone, and inert gases which are free from molecular oxygen are passed in counter-current upwards through the granules at from 70 to 200.degree.C, with the proviso that the inert gas, before leaving the zone, is passed through the deposited layer Or granules, in the lower part of the zone the granules are divided into part-streams over the entire cross-section of the zone, these part-streams are cooled and the granules are passed intermittently, but simultaneously over the entire cross-section or the zone, into a discharge zone, with the proviso that the discharge zone is only partially filled, as well as an apparatus for carrying out the improved process.

    Production of polyamide molding material
    13.
    发明专利
    Production of polyamide molding material 未知

    公开(公告)号：GB1023216A

    公开(公告)日：1966-03-23

    申请号：GB78763

    申请日：1963-01-08

    Applicant: BASF AG

    Inventor： ILLING GERHARD ,  LINGE HERMANN ,  HOERAUF WERNER

    IPC: C08G69/02 ,  C08G69/14 ,  C08K5/3412

    Abstract: A process for the production of moulding materials from polyamides (excluding those made by ionic polymerization of lactams using alkaline-reacting catalysts and alkylenearylene- or aralkylene bis-carbamido lactams as reaction accelerators as claimed in Specifications 900,150 and 900,151) comprises adding prior to, during or after polymerization of the polyamide-forming initial material by means of water or acid catalysts an alkylene-, arylene- or aralkylene bis-carbamido lactam of the formula where n is an integer of 4 to 12, and X is (-CH2-)2- 12, or in an amount of 0.05 to 2.0% by weight with reference to the total amount of polyamide-forming initial material and homogenizing the polyamide in the melt. Specified polyamide-forming materials are e -caprolactam oenantholactam, caprylolactam and laurolactam; mixtures or salts of diamines, e.g. hexamethylene diamine, octamethylene diamine, decamethylene diamine and bis-(4-aminocyclohexyl)-methane with dicarboxylic acids, e.g. adipic, suberic, sebacic, undecane dicarboxylic and heptadecane dicarboxylic acid; mixtures or salts of aliphatic o -aminoalcohols and dicarboxylic acids; and o -aminocarboxylic acids. In the examples: (1) poly-e -caprolactam is mixed with hexamethylene - bis - carbamidocaprolactam; (2) poly-e -caprolactam is mixed with diisooctyl adipate, carbon black and hexamethylene - bis - carbamidocaprylolactam; (3) polyhexamethylene adipamide is mixed with titanium dioxide and hexamethylene-bis-carbamido laurolactam; (4) poly-e -caprolactam is mixed with calcium stearate, di-(2-ethylhexyl)-adipate, polyethylene oxamide and 1 : 6-hexamethylene - bis - carbamido caprylolactam; (5) polycaprylolactam is mixed with toluylene-bis-carbamido-pyrrolidone; (6) e -caprolactam is polymerized in the presence of 6-hexamethylene - bis - carbamido caprolactam and admixed with polyethylene oxamide, titanium dioxide, di-(2-ethylhexy)adipate and calcium stearate; (7) poly-e -caprolactam is mixed with carbon black, diisoctyl adipate and p-xylylene-bis-carbamido caprolactam, and (8) caprylolactam is polymerized in the presence of aqueous phosphorous acid and octamethylene bis-carbamidocaprylolactam.

    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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