Control system for an N-methyl-2-pyrrolidone refining unit recei

Details Control system for an N-methyl-2-pyrrolidone refining unit recei Control system for an N-methyl-2-pyrrolidone refining unit recei

1978-10-19

1980-11-04

Serwin, R. E.

Mineral oils: apparatus

Refining

With filtration

23230A, 196 1452, 364501, 422 62, C10G 2100, C06G 758

Patent

active

042314593

ABSTRACT:
A refining unit treats light sweet charge oil with an N-methyl-2-pyrrolidone solvent, hereafter referred to as MP, in a refining tower to yield raffinate and extract mix. The MP 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 sulfur analyzer, and viscosity analyzers; all analyzing the light sweet charge oil and providing corresponding signals, sensors sense the flow rates of the charge oil and the MP flowing into the refining tower and the temperature of the extract mix and provide corresponding signals. One of the flow rates of the light sweet charge oil and the MP flow rates is controlled in accordance with the signals from all the analyzers and all the sensors, while the other flow rate of the light sweet charge oil and the MP flow rates is constant.

REFERENCES:
patent: 4161427 (1979-07-01), Sequeira et al.
patent: 4162197 (1979-07-01), Sequeira et al.
patent: 4164450 (1979-08-01), Sequeira et al.

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