| abstract |
Disclosed are nylon salt solution preparation processes including a trim diamine feed. The trim diamine is added to a recirculation loop in a continuous stirred tank reactor, where it is blended with the nylon salt solution via a pump. The nylon salt solution is prepared by feeding a dicarboxylic acid monomer and a diamine monomer to a single continuous stirred tank reactor. The dicarboxylic acid is metered, based on weight, from a loss-in-weight feeder to the reactor. The nylon salt solution is formed continuously and has low variability from a target pH and/or a target salt solution concentration. The nylon salt solution is transferred directly to a storage tank, without further monomer addition, pH adjustment, or salt solution adjustment after exiting the continuous stirred tank reactor. |