Fuel and related compositions – Method including measuring – testing or automatic control
Reexamination Certificate
2002-04-18
2003-07-29
Toomer, Cephia D. (Department: 1714)
Fuel and related compositions
Method including measuring, testing or automatic control
C044S457000, C436S060000, C210S728000
Reexamination Certificate
active
06599337
ABSTRACT:
FIELD OF THE INVENTION
The invention relates to the selection of “drag reducer additive” removal agents, and to the detection and/or removal of “drag reducer additive” (DRA) from liquid hydrocarbon fuels.
BACKGROUND
In order to move fluid through pipelines, into or out of wells, or through equipment, energy must be applied to the fluid. The energy moves the fluid, but is lost in the form of friction. This frictional pressure drop, or drag, restricts the fluid flow, limiting throughput and requiring greater amounts of energy for pumping.
Materials can be added to flowing fluids in order to reduce the energy lost due to friction, or drag, thus permitting the movement of more fluid at the same differential pressure. The resulting reduction in frictional pressure drop improves pumping efficiency, lowers energy costs, and increases profitability. Materials for reducing drag in flowing fluids are generally known by the generic names “flow improver” or “drag reducer additive” (sometimes referred to as “DRA”).
Unfortunately, whether in the virgin form or in the sheared or partially sheared form, and despite the fact that it is intentionally added to certain fuels, drag reducer additive nonetheless is a “contaminant” in liquid hydrocarbon fuels, and has the potential to cause a number of problems. For example, the presence of drag reducer additive in motor gasoline, even in the sheared form, has caused increased intake valve deposits, plugging of fuel filters, and increased combustion chamber deposits. In diesel fuels, drag reducer additive may cause plugging of fuel filters and strainers and increased fuel injector deposits. Drag reducer additive is prohibited in aviation turbine fuels, although it has been observed as a contaminant due to accidental addition or other non-intentional means. The presence of drag reducer additive in aviation turbine fuel may result in downgrading of the entire batch to non-aviation kerosene or diesel fuel, both of which generally have less market value.
Viable methods of detecting and quantifying drag reducer additive in liquid hydrocarbon fuels commonly employ gel permeation chromatography, which is time consuming and expensive. Because of this, contaminated liquid hydrocarbon fuels often are used, despite the potential problems if drag reducer additive is present. Contaminated aviation turbine fuels may be diverted to other uses or returned to a refinery for reprocessing, either of which results in additional expense. Methods are needed to easily and inexpensively select materials that are capable of testing for the presence of drag reducer additive and/or capable of removing drag reducer additive from liquid hydrocarbon fuels.
BRIEF SUMMARY
Methods are provided for selecting one or more effective removal agents and using said agents to substantially reduce the concentration of drag reducer additive in a liquid hydrocarbon fuel.
REFERENCES:
patent: 1198039 (1916-09-01), Krause
patent: 2546903 (1951-03-01), Morrell
patent: 2744938 (1956-05-01), Urban, Jr.
patent: 2762852 (1956-09-01), Litton
patent: 3366582 (1968-01-01), Adams et al.
patent: 3977969 (1976-08-01), Zall
patent: 4451377 (1984-05-01), Luxemburg
patent: 4502957 (1985-03-01), Jehle et al.
patent: 4508851 (1985-04-01), Izumi et al.
patent: 4599117 (1986-07-01), Luxemburg
patent: 4758354 (1988-07-01), O'Mara et al.
patent: 5225081 (1993-07-01), Brownawell
patent: 5736053 (1998-04-01), Ikushima et al.
patent: 5788865 (1998-08-01), Smirnov et al.
patent: 5833862 (1998-11-01), Holland
patent: 5884777 (1999-03-01), Pan et al.
patent: 5888402 (1999-03-01), Hommeltoft et al.
patent: 5891324 (1999-04-01), Ohtsuka
patent: 5893398 (1999-04-01), Garrett, Jr.
patent: 5900153 (1999-05-01), Sanford
patent: 6024880 (2000-02-01), Ciora, Jr. et al.
patent: 6027653 (2000-02-01), Holland
patent: 6042722 (2000-03-01), Lenz
patent: 6056805 (2000-05-01), Litwin et al.
patent: 6082392 (2000-07-01), Watkins, Jr.
patent: 6103127 (2000-08-01), Pourfarzaneh
Paula D. Morris & Associates P.C.
Southwest Research Institute
Toomer Cephia D.
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