Process for the hydrolysis of adiponitrile and the...

Details Process for the hydrolysis of adiponitrile and the... Process for the hydrolysis of adiponitrile and the...

C - Chemistry, Metallurgy

08

G

C08G 69/00 (2006.01) C08G 69/04 (2006.01) C08G 69/28 (2006.01)

Patent

CA 2347819

A process for the hydrolysis of a dinitrile (e.g., adiponitrile) utilizing from 0.1 to 500 mmoles of catalyst (e.g., a mixture of phosphorous acid and calcium hypophosphite) per mole of the dinitrile and in the presence of from 0.01 to 0.5 moles of a dicarboxylic acid cocatalyst (e.g., adipic acid) followed by addition of a diamine (e.g., hexamethylenediamine) and heating to produce polymerization. Such a process is particularly useful in the production of nylon 6,6 having a low BHMT content and improved melt stability.

L'invention concerne un procédé d'hydrolyse d'un dinitrile (p. ex., adiponitrile) utilisant entre 0,1 et 500 mmoles de catalyseur (p.ex., un mélange d'acide phosphoreux et d'hypophosphite de calcium) par mole de dinitrile et en présence d'environ 0.01 à 0.5 moles d'un cocatalyseur d'acide dicarboxylique (p.ex., acide adipique) suivi de l'addition d'une diamine (p.ex., hexaméthylènediamine) et du chauffage en vue de la production de la polymérisation. Un tel procédé convient particulièrement à la production de nylon 6,6 présentant une faible teneur en BHMT et faisant preuve d'une stabilité améliorée à l'état fondu.

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