Production of pure methyldichlorophosphane

US4104299A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Alexander Ohorodnik · Lechenich, DE
• Klaus Gehrmann · Lechenich, DE
• Stefan Schafer · Aachen, DE
• Albert Mainski · Cologne, DE

Key dates

• Filing date: Jul 22, 1977
• Grant date: Aug 1, 1978
• Expiry date: Jul 22, 1997

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07F9/52
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Pure methyldichlorophosphane is recovered from a mixture containing phosphorus trichloride and methyldichlorophosphane as its principal constituents by distillation in two stages. Phosphorus trichloride and other low-boiling material are distilled off overhead in the first stage and methyldichlorophosphane is distilled off from high-boiling material in the second stage, the latter being fed with base product coming from the first stage. More specifically, there is dissolved in the said mixture, prior to admitting it to the first distillation stage, 0.01 to 1 weight % of an organic barium compound or 0.1 to 10 weight % of a non-ionic surfactant, and the base product coming from the first distillation stage is admixed, prior to admitting it to the second distillation stage, with 1 to 10 weight % of phosphorus oxychloride.