| 摘要 |
The corrosivity of a petroleum distillate, which has been subjected to desulphurization by contact in the presence of hydrogen with a sulphur-resistant hydrogenation catalyst at elevated temperature and pressure followed by redistillation, is reduced by intimately mixing the distillate with a minor proportion of a polyhydric alcohol and separating the distillate from the alcohol. After this treatment, the distillate passes the B.S.I. copper strip corrosion test. The treatment is particularly applicable to solvent naphthas for use in the dry cleaning and paint industries. Suitable polyhydric alcohols are glycerol and ethylene glycol. In an example, a Kuwait naphtha of 153.5-212 DEG C. boiling range is subjected to hydrocatalytic desulphurization at 780 DEG F. and 100 p.s.i.g., using a catalyst consisting of the oxides of cobalt and molybdenum or alumina, and then redistilled. It is then washed with caustic soda solution, agitated with glycerol and separated from the glycerol.
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