Patent ID: 6995233

Claim:
A process for the continuous manufacture of polyamide, starting with dicarboxylic acids and diamines, comprising, in a permanent regime, the following steps: (1) a starting phase, (2) continuous mixing of two flows of polyamide precursors, one flow rich in acid end groups, and one flow rich in amine end groups, (3) condensation of the mixture of the two flows, the mixing and condensation being carried out in the same plant or in different plants, (4) recovery of a flow of product obtained from the condensation operation, at least one flow rate of the flows of precursor being coupled to the result of an analysis of the contents of acid and amine end groups in the mixture, the condensation medium, or the recovered flow, so as to keep these contents and/or their ratio between two nominal values, wherein said starting phase comprises the following steps: feeding to the condensation plant an aqueous solution comprising dicarboxylate ions and diammonium ions, in proportions such that their molar ratio is between 0.99 and 1.01, establishing an operating regime in the condensation plant under temperature and pressure conditions such that there is condensation starting with the dicarboxylate ions and the diammoniun ions initially included in the aqueous solution, recovery of a flow of the condensation product, and supplying a flow of said precursors and activating the analysis and coupling of the flows.