Abstract: A filtering apparatus having two distinct filter media for filtering circulating fluid in a circulation system. A portion of the fluid entering the filter passes through a first filter media, while a reduced portion of the fluid entering the filter passes through a second filter media. The second filter media accumulates contaminants and suspended particles from the circulating fluid. The filter media is capable of including at least one additive for treating the circulating fluid. Due to the reduced volumetric fluid flow through the second filter media, the additive can be slowly administered to the circulating fluid over a long period of time. The two filter media may be housed in a dual-canister, where the second filter media may be removed and replaced without removing the first filter media.

Abstract: The general object of this invention is to provide an improved process for sweetening and desulfurizing sulfur-containing crude oil streams. Heating the sulfur-containing crude oil stream to an elevated temperature for an extended period of time while stirring and bubbling an inert gas into the crude accelerates the removal of sulfur containing gases from the crude oil stream. Furthermore, the addition of a polyalkylamine to the stirred crude oil can also greatly assist in the expulsion of sulfur containing gases. After processing under these conditions, the hydrogen sulfide producing capacity of the crude oil is reduced significantly, thus making the crude safer for transportation and handling by reducing the health and environmental risks.

Abstract: A process for desulfurizing hydrocarbons such as gasoline and similar petroleum products to reduce the sulfur content to a range of from about 2 to 15 ppm sulfur without affecting the octane rating is described. The sulfur containing hydrocarbon is contacted at slightly elevated temperatures with an oxidizing/extracting solution of formic acid, a small amount of hydrogen peroxide, and no more than about 25 wt % water.

Abstract: A process for desulfurizing hydrocarbons such as gasoline and similar petroleum products to reduce the sulfur content to a range of from about 2 to 15 ppm sulfur without affecting the octane rating is described. The sulfur containing hydrocarbon is contacted at slightly elevated temperatures with an oxidizing/extracting solution of formic acid, a small amount of hydrogen peroxide, and no more than about 25 wt % water.