Process for preparing dialkyl vinylphosphonates

Details Process for preparing dialkyl vinylphosphonates Process for preparing dialkyl vinylphosphonates

1994-12-12

1995-12-12

Richter, Johann

Organic compounds -- part of the class 532-570 series

Organic compounds

Phosphorus esters

558217, C07F 938, C07F 940

Patent

active

054751284

ABSTRACT:
Process for the continuous preparation of dialkyl vinylphosphonates using catalysts at temperatures of from 150.degree. to 270.degree. C. by dissociation of dialkyl acetoxyethanephosphonates 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.

REFERENCES:
patent: 4388252 (1983-06-01), Dursch et al.
patent: 4493803 (1985-01-01), Kleiner et al.
patent: 4894470 (1990-01-01), Roscher et al.
patent: 5132444 (1992-07-01), Northemann et al.

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