Method of obtaining a pure aromatic hydrocarbon from a sump prod

Details Method of obtaining a pure aromatic hydrocarbon from a sump prod Method of obtaining a pure aromatic hydrocarbon from a sump prod

1991-09-26

1993-08-24

Bascomb, Jr., Wilbur

Distillation: processes, separatory

And recovering heat by indirect heat exchange

Utilizing recovered heat for heating the distillation zone

203 27, 203 58, 203 84, 203 98, 203DIG9, 203DIG19, 208313, 585808, 585862, B01D 340, C07C 708

Patent

active

052385400

ABSTRACT:
The method of obtaining a pure aromatic hydrocarbon from a hydrocarbon starting mixture includes extractively distilling the hydrocarbon starting mixture with a selective solvent; feeding the sump product of the extractive distillation through a first and second auxiliary boilers connected in series to form a cooled sump product at a temperature from 105.degree. to 120.degree. C.; delivering the cooled sump product to a separator distillation column at an entry plate in an upper portion of a separator distillation column and operating the separator distillation column to form a reflux in the upper portion; collecting this reflux and heating it with solvent drawn from the sump of the separator distillation column in a third auxiliary boiler; returning the heated reflux to the separator distillation column at another plate under the entry plate to form a liquid phase on the other plate; conducting the liquid phase formed on the other plate through the second auxiliary boiler to form a vapor-liquid mixture by partial vaporization due to heat from the sump product; feeding the vapor-liquid mixture into a lower portion of the separator distillation column to form a vapor in the upper portion of the separator distillation column; wherein the pure aromatic hydrocarbon leaves the top of the separator distillation column.

REFERENCES:
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patent: 4586986 (1986-05-01), Preusser et al.
patent: 4664783 (1987-05-01), Preusser et al.
patent: 4778567 (1988-10-01), Kakimoto et al.

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