Treatment of methanolic-aqueous residues from syntheses...

Details Treatment of methanolic-aqueous residues from syntheses... Treatment of methanolic-aqueous residues from syntheses...

C - Chemistry, Metallurgy

07

C

260/613.5, 260/6

C07C 31/04 (2006.01) C07C 29/84 (2006.01) C07F 9/53 (2006.01)

Patent

CA 1099745

Abstract of the disclosure: A process for treating resi- dues which result from the Wittig synthesis of olefins and which consist principally of methanol, triphenylphosphine oxide, salts and organic by-products, by steam-stripping the volatile constituents, with partial condensation of the steam, and separating the resulting aqueous-organic mixture at 80-100°C into a saline aqueous phase and an organic phase containing principally triphenylphosphine oxide. Using this process provides a simple method of freeing, from triphenylphosphine oxide and other organic impurities, the effluent from syntheses which result in the formation of triphenylphosphine oxide, and thereby on the one hand sub- stantially facilitates the purification of the effluent and on the other hand provides a simple method of recovering the triphenylphosphine oxide. The latter compound, which is easily purified by distillation or recrystallization, can then be used, for example, to prepare the triphenylphosphine required for Wittig syntheses or to prepare the tri- phenylphosphine dichloride required for the synthesis of pesticides.

317897

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