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:
Apr. 09, 1991
Filed:
Apr. 23, 1990
Surendra K Mishra, The Woodlands, TX (US);
Tetra Technologies, Inc., The Woodlands, TX (US);
Abstract
A novel apparatus removes hydrophobic oil from solid particulates in oily sludge waste such as waste material from oil refineries, drilling fluids or muds brines, and other chemical wastes which have solid particulates contaminated with oil. The process involves separation of different components of the sludge on the basis of their size, density and physio-chemical differences. Coarse particulates are removed with the use of screening systems such as sieve bends or vibro-sieves. Oil is removed from these coarse particulates with water rinsing. Oil is removed from fine particles by gravity separation, which separates the sludge into high and low density fractions. Froth flotation is used to remove hydrophilic materials from the high density fraction. Froth flotation may involve the use of frothing agents, surface modifying agents and surfactants, the selection of which generally depends on the composition of the sludge, the physical and chemical characteristics of the sludge, and the desired separation composition.