Simultaneous preparation of acetic anhydride and acetic acid

Abstract

Abstract PURPOSE:To obtain the titled compounds simultaneously at industrially satisfactory speed, by reacting catalytically a mixture of methyl acetate/methanol in a specific molar ratio with a CO-containing gas in the presence of a catalyst consisting of a limited combination comprising rhodium as a main catalyst in a liquid phase. CONSTITUTION:A mixture (especially preferably azeotrope) of methyl acetate/ methanol in a molar ratio of 1/3-3/1 is reacted catalytically with a CO-containing gas in a liquid phase at 120-200 deg.C in the presence of a catalyst consisting of (A) rhodium or its metal compound (e.g., rhodium chloride), (B) tri-substituted phosphine such as trimethylphosphine, triphenylphosphine, etc., (C) chromium or zircon or their metallic compounds, and (D) iodine compound (e.g., methyl iodide, or lithium iodide). The amounts of catalyst components used are 0.1-20mg atom A, 0.05-2mol B, 0.2-2mol D and 0.1-10mol C based on 1 rhodium atom per lliquid reaction mixture.

Inventors

• 👤 Yasuo Tokito
• 👤 時任　康雄

Bibliographic Details