PROCESS FOR INCREASING THE MOLECULAR WEIGHT OF A POLYAMIDE

摘要

Process for increasing the molecular weight of a polyamide comprising a first step, wherein the polyamide is contacted in countercurrent with a first stream comprising 15 to 100 wt. % H2O and 85 to 0 wt. % N2 at a temperature between 90 and 180° C. and for a time between 5 and 10 hours and a second step, wherein the polyamide obtained in the first step is contacted in countercurrent with a second stream comprising 90 to 100 wt % N2 and 10 to 0 wt % H2O at a temperature between 130 and 200° C. and for a time between 10 and 30 hours.