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Paraffins. Chemistry and Technology by F. Asinger and H. M. E. Steiner (Auth.)

By F. Asinger and H. M. E. Steiner (Auth.)

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The higher-boiling components are stripped from the oil without pressure, and the latter is returned to the plant [49]. With current recovery processes, 70-80 per cent of the propane, 95 per cent of the butanes, and 100 per cent of the higher paraffins present in the various gases can be separated [50]. Natural gasoline, as used for mixing with straight-run or other gasolines, still contains a comparatively large amount of butane. Table 13 gives the composition of some natural gasolines. Crude natural gasoline in non-stabilized form may contain up to 55 per cent of propane and butanes.

On the other hand, the ethane is mainly formed in the slurry phase. The almost complete absence of unsaturated aliphatic hydrocarbons is due to the very nature of the hydrogénation process. The olefins arising by cracking are immediately saturated in consequence of the high partial pressure of hydrogen and the hydrogenating action of the catalyst. (a) The occurrence of the gaseous paraffinic hydrocarbons in the various phases of lignite hydrogénation The sources from which recoverable gases arise during the hydrogénation of coal vary a great deal.

Specifically, about 10,000 tons of recoverable propane (about 83 per cent of the actual amount made) and 8000 tons of butane, consisting of approximately equal amounts of n-butane and isobutane, are produced as such. e. about 91 per cent of the total butane produced. The difference of 5000 tons, relative to the yearly average, is added to gasoline. In winter, because of the low temperatures it is necessary to add substantial amounts of butane to maintain a definite gasoline vapour pressure and the butane content of the gasoline is therefore considerably higher than in the summer.

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