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

1980-09-23

Ruggiero, Joseph F.

Boots, shoes, and leggings

196 1452, 208311, 208DIG1, 422 62, G06G 758, C10G 2100

Patent

active

042246741

ABSTRACT:
A refining unit treats heavy sweet charge oil with a 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 refractometer, a sulfur analyzer and viscosity analyzers; all sampling the heavy 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 heavy sweet charge oil and the MP flow rates is controlled in accordance with the signals from all the analyzers, the refractometer and all the sensors, while the other flow rate of the heavy sweet charge oil and the MP flow rates is constant.

REFERENCES:
patent: 3686488 (1972-08-01), Woodle
patent: 3718809 (1973-02-01), Woodle
patent: 3799871 (1974-03-01), Sequeira, Jr.
patent: 4053744 (1977-10-01), Woodle

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