Preparation of piperazinones for use as sulfur dioxide absorbents
申请人:THE DOW CHEMICAL COMPANY
公开号:EP0421794A2
公开(公告)日:1991-04-10
2-Piperazinones suitable as a regenerable sulfur dioxide absorbing medium are made by reacting a 1-cyano-1-hydroxyalkane with ethylenediamine or a substituted ethylenediamine in aqueous solution. The cyano compound is present in at least a molar equivalent amount to the diamine and the resulting 2-piperazinone product is sparged with an inert gas.