中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

64 records (took 0.024 seconds)

    PROCESS FOR THE CONTINUOUS PRODUCTION OF POLYAMIDES
    3.
    发明专利
    PROCESS FOR THE CONTINUOUS PRODUCTION OF POLYAMIDES 未知

    公开(公告)号：DE3468886D1

    公开(公告)日：1988-02-25

    申请号：DE3468886

    申请日：1984-06-13

    Applicant: BASF AG

    Inventor： PIPPER GUNTER ,  SCHMIDT FRANZ DR ,  THEYSOHN RAINER DR ,  RIEGGER SIEGFRIED DR ,  HEIL EDUARD ,  FISCHER HERMANN DR ,  THOMA RICHARD DR ,  MATTHIES PAUL DR

    IPC: C08G69/00 ,  C08G69/26 ,  C08G69/28 ,  C08L77/00

    Abstract: Nylons are prepared by a continuous process in which, in a precondensation zone, an aqueous solution of a salt of a dicarboxylic acid of 6 to 18 carbon atoms and a diamine of 6 to 18 carbon atoms is heated to 250 DEG -300 DEG C. under superatmospheric pressure, with simultaneous vaporization of water and formation of a prepolymer, the prepolymer and the vapor are separated, and the former is fed into a polycondensation zone and condensed under superatmospheric pressure of from 1 to 10 bar and at from 250 DEG to 300 DEG C., wherein the aqueous salt solution is condensed under superatomspheric pressure of from 1 to 10 bar in the first third of the tubular precondensation zone provided with baffles, until the degree of conversion is not less than 93%, and the prepolymer and the vapor phase are brought into intimate contact with one another in the remaining two thirds of the precondensation zone.

    6.
    发明专利
    未知

    公开(公告)号：DE3321579A1

    公开(公告)日：1984-12-20

    申请号：DE3321579

    申请日：1983-06-15

    Applicant: BASF AG

    Inventor： PIPPER GUNTER ,  SCHMIDT FRANZ DR ,  THEYSOHN RAINER DR ,  RIEGGER SIEGFRIED DR ,  HEIL EDUARD ,  FISCHER HERMANN DR ,  THOMA RICHARD DR ,  MATTHIES PAUL DR

    IPC: C08G69/00 ,  C08G69/26 ,  C08G69/28 ,  C08L77/00

    Abstract: Nylons are prepared by a continuous process in which, in a precondensation zone, an aqueous solution of a salt of a dicarboxylic acid of 6 to 18 carbon atoms and a diamine of 6 to 18 carbon atoms is heated to 250 DEG -300 DEG C. under superatmospheric pressure, with simultaneous vaporization of water and formation of a prepolymer, the prepolymer and the vapor are separated, and the former is fed into a polycondensation zone and condensed under superatmospheric pressure of from 1 to 10 bar and at from 250 DEG to 300 DEG C., wherein the aqueous salt solution is condensed under superatomspheric pressure of from 1 to 10 bar in the first third of the tubular precondensation zone provided with baffles, until the degree of conversion is not less than 93%, and the prepolymer and the vapor phase are brought into intimate contact with one another in the remaining two thirds of the precondensation zone.

Patent Agency Ranking