| 摘要 |
A hydrofining process for producing lubricating oils having improved colour and oxidation stability comprises treating the oils with hydrogen at elevated temperature and pressure, for example 150-370 DEG C. and 5-80 atmos., in the presence of a catalyst consisting of the oxides of cobalt and molybdenum incorporated with a mixture of iron and magnesium oxides prepared by coprecipitation. The preferred hydrogen feed rate is 5-150 v./vol. and the preferred oil feed rate is 0.5-6 v./vol. catalyst/hr. The iron oxide content is preferably at least 10% wt., the ratio magnesium oxide : iron oxide in the region 2 : 1, and the ratio molybdenum oxide : cobalt oxide at least 3 : 1. In an example, the catalyst is prepared by pouring a boiling solution of ferric nitrate and magnesium sulphate into a boiling solution of caustic soda, filtering, washing, drying, calcining, and granulating, pouring ammonium molybdate solution over the granules and drying, impregnating twice with cobalt nitrate solution, drying and calcining. Specifications 913,047, 913,048 and 943,998 are referred to. |
