4th, Combining together a series of apparatus, such as hereinbefore
described, for the purpose of procuring a continuous distillation
of petroleum, each member of a series consisting of a vacuum still
containing a coil of steam pipe as evaporating surfaces, and troughs
for the gradual distillation of the oil, in combination with suitable
condensing apparatus, substantially as and and for the purposes
hereinbefore set forth.
5th, A vacuum residnum receiver D, connected to and in combination with
a vacuum still, or a battery of such stills, substantially in the manner
and for the purposes above set forth.
72,126.--DISTILLING HYDROCARBON OILS.--Herbert W. C. Tweddle, Pittsburg,
Pa.
I claim, 1st, In distilling hydrocarbon oils, vaporizing the oil by
causing it to flow in a thin film or layer over the surfaces of a series
of heated pipes in a vacuum still, with or without the application of
superheated steam, substantially as above described.
2d, The application of the process of distillation, hereinbefore
described, to the re-distillation of fire-distilled oils, for the
purpose of producing an oil similar to the refined oil of commerce,
substantially as above set forth.
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