| 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, is reduced by adding a minor proportion of phenylene diamine or an N-alkyl derivative thereof to the distillate and then redistilling. 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. In an example, a Kuwait naphtha of 152-205 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, 0.02 per cent by volume of N, N1-di-sec.-butyl - p - phenylene diamine is added to the desulphurized naphtha and the mixture redistilled.
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