| 摘要 |
The invention relates more particularly to a process for producing a concentrated solution of hexamethylenediammonium adipate salt, also known as nylon salt, used as starting material for the production of polyamide, more specifically of PA66. The process for producing an aqueous solution of diamine and diacid salts, obtained by mixing a diacid and a diamine, at a concentration of salt of between 50% and 80% by weight, comprises preparing, in a first step, an aqueous solution of diacid and diamine having a diacid/diamine molar ratio of greater than 1.1 and, in a second step, adjusting the diacid/diamine molar ratio, through the addition of diamine, to a value of between 0.9 and 1.1, preferably between 0.99 and 1.01, and fixing the concentration of salt by weight through, optionally, the addition of water.
|
