Michael J Gerondale

US Patent:

48850624, Dec 5, 1989

Filed:

Jun 20, 1988

Appl. No.:

7/209123

Inventors:

Charles W. Harrison - Houston TX
Michael J. Gerondale - Glendale AZ
Anthony J. Patrone - Port Arthur TX

Assignee:

Texaco Inc. - White Plains NY

International Classification:

C10G 7334

US Classification:

196 145

Abstract:

A control system controls a lubricating oil dewaxing apparatus. The temperature of waxy oil flowing through the apparatus is controlled. A sequential plurality of temperature sensing means senses the temperature of the waxy oil. A Comparing Means determines an isothermal heat transfer zone corresponding to latent heat transfer wax crystallization. Temperature upstream of the isothermal zone is controlled to a selected chilling rate. Temperature downstream of the isothermal zone is controlled to a selected filtering temperature. The control system effects the growth of wax crystals of a uniform and moderate size for optimum filtering rate and oil content.