公开(公告)号：EP2160432A1

公开(公告)日：2010-03-10

申请号：EP08760905.3

申请日：2008-06-12

Applicant: BASF SE

Inventor： DESBOIS, Philippe ,  STAWITZKI, Hagen ,  NEUHAUS, Ralf ,  WEIS, Hans-Joachim ,  WEICHMANN, Jürgen ,  FERNANDEZ RODILES, Raquel ,  VOGEL, Gunter

IPC: C08G69/26 ,  C08G69/28 ,  C08L77/06

CPC classification number: C08G69/26 ,  C08G69/265 ,  C08G69/28

Abstract: The invention relates to a method for producing polyamides based on dicarboxylic acids and diamines, comprising the following steps: 1) preparing an aqueous monomer mixture of dicarboxylic acids and diamines, the molar ratio of dicarboxylic acids to diamines being adjusted such that a molar deficit of dicarboxylic acids or diamines of 1 to 10 mol %, relative to the other component, is present at the end of step 3), 2) transferring the aqueous mixture from step 1) into a continuously operated vaporization reactor, in which diamines and dicarboxylic acids are converted at a temperature in the range from 100 to 370 °C and a pressure in the range from 1 to 50 bar, 3) transferring the mixture from step 2) into a precipitator operated at a temperature in the range from 100 to 370 °C under separation of gaseous components, 4) transferring the mixture from step 3), together with diamine or dicarboxylic acid at a quantity suitable to make up for the molar deficit, into an extruder operating at a temperature in the range from 150 to 400°C for a dwell period in the range from 10 seconds to 30 minutes, while removing gaseous components through degassing openings.