石油学会誌

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For the production of ML-grade motor oil, mildly solvent extracted and dewaxed motor oil fractions, obtained from Persian Gulf crude, were hydrogen-treated with CoMo (sulfide)/alumina catalyst under various treating conditions. A bench-scale pilot plant containing 200ml of the catalyst was used for the hydrogen-treatment. General properties, oxidation stability and engine performance of the hydrogen-treated oils were compared with those of acid/clay-treated oils.
Hydrogen-treated oils obtained under relatively severe treating conditions showed favorable properties in color and viscosity index. They showed, however, inferior oxidation stability and poor engine performance, and also their viscosity was decreased.
On the other hand, hydrogen-treated oils obtained under relatively mild treating conditions showed good oxidation stability and good engine performance. General properties, oxidation stability and engine performance of these oils were almost the same with those of acid/clay-treated oils.

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Reduction of silver nitrate by hydrogen in the volumetric analysis of minute amount of acetylenes using silver nitrate was studied. Effect of temperature, concentration of hydrogen, types of reagents and solvents, etc. on the reduction by hydrogen were studied fundamentally and it was found that the temperature had the largest influence. Based on the results of these studies, a process for the volumetric analysis on minute amount of acetylenes in thermally cracked gas giving accurate results was developed by maintaining the reaction temperature at 20°C, to prevent the side reduction reaction by hydrogen.

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