The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 04, 1990
Filed:
May. 02, 1989
Michael J Uremovich, Manhattan, IL (US);
Other;
Abstract
A process for separating water and hydrocarbon from the solids in a petroleum product tank sludge is water-free, solvent-free, conducted at ambient conditions, utilizes no pre-coating with a filter aid, and creates no hazardous environment for filtering finished product sludge, such as gasoline. The process comprises operating a first pump and pumping sludge to a mixing tank and agitating the mixture. Solids content is measured and a determined volume of filter aid is added. The filter aid and sludge are mixed by operation of a mixer assembly which co-acts with baffles in the tank to achieve homogeneity in the mixing tank. A second pump pumps the mixing sludge and filter aid through one of a plurality of alternately selectable sealed horizontal plate filter and recirculates the filtered liquid back through the mixing tank until a desired clarity is reached. The filtered liquid may be pumped to an oil/water separator and the filtrate, or cake, collected on the filter plates is dried, preferably by introduction of an inert gas, and removed to be be taken to a disposal site.