PROCESS FOR MAKING A SOLID DIAMMONIUM DICARBOXYLATE SALT AND POLYAMIDES THEREOF
The present invention relates to a process for making a solid diammonium dicarboxylate salt suitable for making a polyamide, wherein the process comprises a step of contacting, in essentially counter-current fashion, a dicarboxylic acid in solid form with a vapor stream containing a diamine in gaseous form inside a reaction zone of a reactor column, wherein the reaction zone contains a heat exchanger section, the solid dicarboxylic acid is moving as a moving packed bed through the reactor column while being transported by gravity, and reactor column contains a gas inlet section located at the top of the column to feed inert gas into the reactor column. The present invention also relates to a polymerisation process of the solid diammonium dicarboxylate salt obtained via the method above.