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.% H<SUB>2</SUB>O and 85 to 0 wt.% N<SUB>2</SUB> at a temperature between 90 and 180 <SUP>0</SUP>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% N<SUB>2</SUB> and 10 to 0 wt% H<SUB>2</SUB>O at a temperature between 130 and 200 <SUP>0</SUP>C and for a time between 10 and 30 hours.