Means for controlling dewaxing apparatus

Details Means for controlling dewaxing apparatus Means for controlling dewaxing apparatus

1974-07-26

1976-08-03

Wolk, Morris O.

Mineral oils: apparatus

Dewaxing

23253A, 196 1452, 196132, 203 1, 203 2, 203 3, 208 33, 208DIG1, 23515112, 23515113, B01D 1104, C10G 4308, G05B 2102, G05B 2402

Patent

active

039727793

ABSTRACT:
A control system controls the flow rates of waxy oil and solvent entering a dewaxing unit so as to control the viscosity of a chilled slurry mix or waxy oil and solvent provided to a filter in the dewaxing unit. The dewaxing unit includes valves controlling the flow rates of the solvent and waxy oil being provided to the chiller. The filter provides a dewaxed oil and solvent mixture and wax. Using the equation hereinafter mentioned, the control apparatus utilizes the sensed refractive index of the solvent, the sensed viscosity of the waxy oil, the sensed flow rates of the solvent and the waxy oil, and the sensed filtering temperature of the chilled slurry mix to generate a signal corresponding to the viscosity of the slurry mix provided to the filter at the filtering temperature. The viscosity of the chilled slurry mix is controlled within predetermined limits by a generating signal corresponding to the dilution ratio of the solvent to the waxy oil. The dilution signal is used to provide control signals to valves controlling the flow rates of the waxy oil and of the solvent to achieve the desired ratio which results in a desired viscosity of the chilled slurry mix.

REFERENCES:
patent: 2565489 (1951-08-01), Fischer
patent: 2726987 (1955-12-01), Macke
patent: 3202602 (1965-08-01), Beaugh et al.
patent: 3458432 (1969-07-01), Woodle et al.
patent: 3506564 (1970-04-01), Cone
patent: 3549514 (1970-12-01), Brown et al.
patent: 3565786 (1971-02-01), Brown et al.

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