Download e-book for kindle: Chemistry and Technology of Lubricants by Roy M. Mortier, Malcolm F. Fox, Stefan T. Orszulik

By Roy M. Mortier, Malcolm F. Fox, Stefan T. Orszulik

ISBN-10: 140208661X

ISBN-13: 9781402086618

ISBN-10: 1402086628

ISBN-13: 9781402086625

It is a great, short, low-cost advent to the topic, and maybe first-class for its time (1997). in spite of the fact that, there is virtually not anything the following that is not in a higher, newer compilation (2005, CRC) at the similar topic, edited through LR Rudnick. This later paintings by means of CRC, Taylor & Francis, is the absolute most sensible and such a lot whole that has seemed just about syntheitic lubricants.

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Typical reactor operating conditions for hydrofinishing are the following: – catalyst temperature, 250–350◦ C, – operating pressure, 20–60 bar, – catalyst type, Ni, Mo supported on high-surface-area alumina particles. J. Prince Fig. 5 Modern Catalytic Processes In recent years the solvent-based separation processes have faced competition from new processes based on catalytic hydrogenation as an alternative means of removing unwanted components from the base oil. Hydrogenation offers economic advantages over solvent processes and gives products that are clearly differentiated from conventional solvent-refined base oils.

E. processing up and down the viscosity range. This avoids major changes in operating conditions and minimises wastage of mixed fractions during changeover. 7 Solvent De-waxing The material which crystallises out of solution from lubricant distillates or raffinates is known as wax. Wax content is a function of temperature. As the temperature is reduced, more wax appears. Sufficient wax must be removed from each base oil fraction to give the required low-temperature properties for each base oil grade.

Each distillate or bright stock stream is processed separately because different process conditions are needed to obtain optimum results for each base oil grade. The main factors in operation of such a plant are the following: Solvent/oil ratio: Increasing the solvent/oil ratio allows deeper extraction of the oil, removing more aromatics and, of course, decreasing the raffinate yield. Over-extraction should be avoided because good lubricant components may be lost. Extraction temperature: Solvent power increases with temperature, but selectivity decreases until feed and solvent become miscible.

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Chemistry and Technology of Lubricants by Roy M. Mortier, Malcolm F. Fox, Stefan T. Orszulik

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