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AssigneeTexaco Inc.
InventorsFrederick C. Alverson, Edward D. MacMurtrie, Norman R. Odell
Estimating the term…
The output oil from a solvent dewaxing unit is controlled so that it is provided as product oil when the wax content of the output oil is within a predetermined limit, or not provided as product oil when the wax content is not within the predetermined limit. The output oil from the dewaxing unit is sampled and solvent in the sample oil is removed. The solvent-free sample oil is chilled to a predetermined temperature. An analyzer receives the chilled sample oil and provides a signal corresponding to the wax content of the sample oil. A network coupled to the analyzer provides a control signal of one amplitude when the signal from the analyzer is within a predetermined limit and of another amplitude when the signal from the analyzer is not within the predetermined limit. A valve receiving the output oil from the dewaxing unit is responsive to the control signal to provide the output oil as product oil when the control signal is of the one amplitude and does not provide the output oil as product oil when the control signal is of the other amplitude.
A system for controlling the output oil from a solvent dewaxing unit comprising means for sampling the output oil, means for removing solvent from the sample oil, means for chilling the solvent free sample oil, means receiving the chilled sample oil for determining the wax content of the sample oil and providing a signal corresponding thereto, control means coupled to the sensing means for providing a control signal of one amplitude when the signal from the sensing means is within a predetermined limit and of another amplitude when the signal from the sensing means is not within the predetermined limit, and valve means receiving the output oil from the dewaxing unit and responsive to the signal from the control means for providing the output oil as product oil when the wax content of the sample oil is within the predetermined limit and for not providing the output oil as product oil when the wax content of the sample oil is not within limit.
A method for controlling the output oil from a solvent dewaxing unit comprising the steps of sampling the output oil, removing solvent from the sample oil, chilling the solvent free sample oil, determining the wax content of the sample oil, providing a wax content signal corresponding to the determined wax content, providing a control signal of one amplitude when the wax content signal is within a predetermined limit and of another amplitude when the wax content signal is not within the predetermined limit, providing the output oil as product oil when the wax content of the sample oil is without the predetermined limit, and not providing the output oil as product oil when the waxed content of the sample oil is not within limit.
Dependencies are inferred from the claim text.