Isolation of triphenylphosphine

US5481041A · kind A · utility

Assignee

• BASF SE

Inventors

• Peter Lechtken · Bischofswerda, DE
• Friedrich Sauer · Grünstadt, DE
• Matthias Fankhaenel · Ludwigshafen, DE
• Dieter Hermeling · Haßloch, DE

Key dates

• Filing date: Aug 3, 1994
• Grant date: Jan 2, 1996
• Expiry date: Aug 3, 2014

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07F9/5095
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for isolating triphenylphosphine (TPP) from a triphenylphosphine/aluminum chloride complex dissolved in chlorobenzene by decomplexation, hydrolysis and extraction using water and subsequent separation of the liquid/liquid dispersion, which is composed of a TPP-containing chlorobenzene phase and of an containing Al and Cl compounds aqueous phase, into a TPP-containing chlorobenzene phase and into a TPP-free, aqueous phase, containing Al and Cl compounds, wherein water is dispersed in the chlorobenzene phase in a ratio of 0.6-0.95 kg of water per kg of chlorobenzene solution in a 1st mixing apparatus in such a way that the temperature resulting from the hydrolysis is in the range from 60.degree. to 90.degree. C., the dispersion being carried out with residence times of 5-30 minutes and energy densities of 2-10 kW/m.sup.3, a second dispersion is carried out in a 2nd mixing apparatus with residence times of 5-60 minutes and energy densities of 0.05-0.5 kW/m.sup.3, and the heavier TPP-containing chlorobenzene phase is separated from the lighter TPP-free, aqueous phase containing Al and Cl compounds in a phase separator.