Process for preparing dialkyl vinylphosphonates

Details Process for preparing dialkyl vinylphosphonates Process for preparing dialkyl vinylphosphonates

C - Chemistry, Metallurgy

07

F

C07F 9/40 (2006.01) B01D 1/22 (2006.01) B01D 3/14 (2006.01)

Patent

CA 2137966

Process for the continuous preparation of dialkyl vinyl- phosphonates using catalysts at temperatures of from 150 to 270°C by dissociation of dialkyl acetoxyethanephos- phonates at a pressure of from 5 to 500 mbar in contact with a liquid, catalytically active medium while drawing off the dialkyl vinylphosphonates formed and other volatile reaction products as vapors, by conveying the liquid medium in forced circulation via an evaporator while feeding in fresh dialkyl acetoxyethanephosphonate, if desired admixed with catalyst, corresponding to the distillation of dialkyl vinylphosphonates and other volatile compounds, and drawing off non-volatile material formed as byproduct from the liquid circuit to maintain constant conditions.

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