Preparation of piperazinones for use as sulfur dioxide...

Details Preparation of piperazinones for use as sulfur dioxide... Preparation of piperazinones for use as sulfur dioxide...

C - Chemistry, Metallurgy

07

D

260/267.5

C07D 241/08 (2006.01)

Patent

CA 2027107

Abstract The 2-piperazinones are made by reacting a 1-cyano-1-hydroxyalkane with ethylenediamine or a subs- tituted ethylenediamine in aqueous solution. The process to make the 2-piperazinones suitable as a regen- erable sulfur dioxide absorbing medium requires that the cyano compound be present in at least a molar equivalent amount to the diamine and that the resulting 2-piperazi- none product be sparged with an inert gas. 37,683-F

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