Automatic control of feedstock vacuum towers

Details Automatic control of feedstock vacuum towers Automatic control of feedstock vacuum towers

1988-07-19

1990-01-16

Caldarola, Glenn

Mineral oils: processes and products

Fractionation

Distillation

208355, 208358, 208DIG1, 203 2, 202160, B01D 342

Patent

active

048941450

ABSTRACT:
In a fractional distillation tower which is divided into a plurality of sections by total drawoff trays, and wherein at least one fraction is withdrawn from each section. The cut point temperature between fractions is determined based on the partial pressure and temperature of the vapor in the upper portion of a section. The thus determined cut point temperature may be compared to a set point with the results of the comparison being utilized to maintain the actual cut point temperature between fractions substantially equal to the desired cut point temperature.

REFERENCES:
patent: 3310487 (1967-03-01), Johnson et al.
patent: 3338825 (1967-08-01), Taggart
patent: 3365386 (1986-01-01), Van Pool
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patent: 3403725 (1969-08-01), Macfarlane et al.
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patent: 4555309 (1985-11-01), Jain
patent: 4560442 (1985-12-01), Jain
patent: 4578151 (1986-03-01), Soderstrom, III et al.

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