Procedure for vaporization of a hydrazine solution

Details Procedure for vaporization of a hydrazine solution Procedure for vaporization of a hydrazine solution

B - Operations, Transporting

01

D

202/79

B01D 3/06 (2006.01) C01B 21/16 (2006.01) C07C 241/02 (2006.01)

Patent

CA 2031318

The invention concerns a procedure for vaporizing a solution of hydrazine hydrate which consists in heating the solution in the liquid phase, then reducing pressure to initiate vaporization. It was found that this procedure prevents decomposition of the hydrazine hydrate. The invention is particularly useful for the reboiler in a column in which an azine R1R2C=N-N=CR1R2 (R1 and R2 being alkyls with up to 12 carbon atoms) is being hydrolized, with hydrazine hydrate being drawn off at the base and cetone R1R2C=0 at the top.

L'invention concerne un procédé de vaporisation d'une solution d'hydrate d'hydrazine qui consiste à chauffer cette solution en phase liquide, puis à la détendre pour provoquer la vaporisation. On a découvert que ce procédé permet d'éviter la décomposition de l'hydrate d'hydrazine. L'invention est particulièrement utile pour le rebouilleur d'une colonne dans laquelle s'effectue l'hydrolyse d'une azine R1R2C=N-N=CR1R2 (dans laquelle R1 et R2 sont des alkyls ayant jusqu'à 12 atomes de carbone) avec récupération d'hydrate d'hydrazine en pied et de cétone R1R2C=0 en tête.

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