Control system for a furfural refining unit receiving medium swe

Mineral oils: apparatus – Solvent extraction

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Details

23230A, 364497, 364501, C10G 2100, C06G 758

Patent

active

041614275

ABSTRACT:
A furfural refining unit treates medium sweet charge oil with a furfural solvent in a refining tower to yield raffinate and extract mix. The furfural is recovered from the raffinate and from the extract mix and returned to the refining tower. A system controlling the refining unit includes a gravity analyzer, a refractometer and viscosity analyzer, all analyzing the medium sweet charge oil and providing corresponding signals, sensors sense the flow rates of the charge oil and the furfural flowing into the refining tower and the temperature of the extract mix and provide corresponding signals. One of the flow rates of the medium sweet charge oil and the furfural flow rates is controlled in accordance with the signals from all the analyzers and all the sensors, while the other flow rate of the medium sweet charge oil and the furfural flow rates is constant.

REFERENCES:
patent: 3799871 (1974-03-01), Sequeira, Jr.
patent: 3911259 (1975-10-01), Huddleston et al.
patent: 3972779 (1976-03-01), Harrison
patent: 4053744 (1977-10-01), Woodle

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