Continuous polyamidation process

C - Chemistry – Metallurgy – 08 – G

Patent

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C08G 69/28 (2006.01)

Patent

CA 2333260

A process for producing a polyamide from dicarboxylic acid monomer and diamine monomer comprises the steps of: (a) mixing molten dicarboxylic acid monomer and molten diamine monomer in equimolar amounts, thereby producing a molten reaction mixture; (b) flowing the reaction mixture through at least one unvented reaction vessel, the residence time of the reaction mixture in the at least one unvented reaction vessel being between about 0.01 minutes and about 30 minutes, thereby forming a first product stream that comprises polyamide and water of polymerization; and (c) flowing the first product stream through at least one vented vessel, whereby water of polymerization is removed, thereby forming a second product stream that comprises polyamide. The process can operate continuously, and there is no need to add water to the dicarboxylic acid, to the diamine, or to the reaction mixture.

Procédé de production d'un polyamide à partir d'un monomère acide dicarboxylique et d'un monomère diamine, qui consiste (a) à mélanger le monomère acide dicarboxylique fondu et le monomère diamine fondu en quantités équimolaires pour produire un mélange de réaction fondu, (b) à faire couler ledit mélange de réaction dans au moins une cuve de réaction exempte d'évent, la durée de séjour du mélange de réaction dans ladite cuve au moins étant d'environ 0,01 minute à environ 30 minutes, ce qui produit un premier flux de produit comportant du polyamide et l'eau de polymérisation, et (c) à faire couler le premier flux de produit dans au moins une cuve dotée d'évents, l'eau de polymérisation étant éliminée, ce qui forme un second flux de produit qui comprend le polyamide. Ledit processus peut fonctionner en continu, et il n'est pas nécessaire d'ajouter de l'eau à l'acide dicarboxylique, à la diamine ou au mélange de réaction.

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