| 摘要 |
<p>1489074 Glycol acetates HALCON INTERNATIONAL Inc 12 Dec 1974 [12 Dec 1973] 53836/74 Heading C2C Vicinal glycol acetates are prepared by reacting acetic acid, ethylene and molecular oxygen in the presence of a catalyst system comprising (1) at least one variant valency cation from Te, Ce, Sb, Mn, V, Ga, As, Co, Cu, Cr and Se cations and (2) at least one of bromine, chlorine, a bromine-containing compound and a chlorine containing compound, and in which the oxidation zone is supplied with a liquid feed of acetic acid and a level of formic moieties, calculated as formic acid, of 3 to 10 weight per cent is maintained in the liquid feed. The liquid feed may have formic moieties in the range 4 to 8% and the liquid feed may include catalyst and recycled higher boiling components. The reaction may be continuous and the reaction mixture recovered from the oxidation zone may be distilled once or in a plurality of steps to separate a product of vicinal acetates on aqueous stream, an acetic acid and lowerboiling non-aqueous component stream, and a higher-boiling and non-volatile component stream. An example describes the process using tellurium dioxide, hydrogen biomide and controlled quantities of formic acid, with the aid of a flow diagram of suitable apparatus.</p> |
