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:
Nov. 27, 2007
Filed:
Jun. 16, 2004
Doug Larson, River Forest, IL (US);
Doug Larson, River Forest, IL (US);
Heritage Crystal Clean, LLC, Elgin, IL (US);
Abstract
A filter system for receiving an aqueous-based fluid contaminated with particles and emulsified contaminant oil, removing the particles, and separating the emulsified contaminant oil from the aqueous-based fluid includes a filter media for receiving the aqueous-based fluid and emulsified contaminant oil, having an inner filter element formed from a 95 percent single pass efficiency 48 micron (5 micron nominal) filtering material of needle punch polypropylene felt, an outer filter element formed from a 95 percent single pass efficiency 19 micron absolute filtering material of a polypropylene microfiber material and a porous spunbond polypropylene sandwiching the outer filter media. The filter element removes particles, de-emulsifies the emulsified contaminant oil from the aqueous-based fluid into the contaminant oil and the aqueous-based fluid, separates the de-emulsified contaminant oil from the aqueous-based fluid, coalesces the separated contaminant oil and passes both the coalesced de-emulsified contaminant oil with entrained particles and the aqueous-based fluid. A first tank supports the filter element and is further configured to hold a quantity of the separated coalesced contaminant oil and the aqueous-based fluid. The first tank has a first outlet passing the aqueous-based fluid from the first tank to near the bottom of the second tank and a second outlet passing the separated coalesced contaminant oil to the top of the second tank. The second tank has an oil separation assembly for separating the aqueous-based fluid from the contaminant oil and passing the aqueous-based fluid therefrom. The second container also has a drain valve assembly for removing only the accumulated coalesced de-emulsified contaminant oil. A method for separating the emulsified contaminant oil from the aqueous-based fluid and recovering the aqueous-based fluid is also disclosed.