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AssigneeExxonMobil Research and Engineering Company
InventorsJames W. Gleeson, Eric B. Sirota, Charles L. Baker, Dennis A. Gaal, David Mentzer, John E. Gallagher, Jr., Min Chang, Norman G. Cathcart, Stephen A. Geibel, Mark F. Hurwitz, Tore H. Lindstrom, Michael B. Whitlock
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The present invention is a process for removing waxy haze from and improving the filterability of base stocks including heavy mineral oil base stocks, gas-to-liquids (GTL) and hydrodewaxed or hydroisomerized waxy feed basestocks by filtering the waxy haze causing particles out of the base stock employing a filter characterized by a high surface area of pores accessible to the haze wax particles which have particles dimensions of no more than about 5 microns.
A method for reducing/mitigating waxy haze formation at a target haze disappearance temperature in base stocks susceptible to haze formation by filtering haze producing wax out of the base stock, said method comprising incubating the base stock for a time and at a temperature sufficient for haze wax particles to form and filtering the haze base stock through a filter material having a total material surface area of at least 0.5 m2/g to up to 100 m2/g accessible to the wax particles and pores of from 0.2 to 50 microns wherein the hazy wax is removed from the base stock and is trapped by the filter and recovering the dehazed base stock as filtrate wherein said recovered dehazed base stock remains haze-free at the target haze disappearance temperature for at least fourteen days, and wherein non-waxy particulate material is removed from the base stock before the base stock is filtered to remove the wax.
A method for reducing/mitigating waxy haze formation at a target haze disappearance temperature in base stocks susceptible to haze formation by filtering haze producing wax out of the base stock, said method comprising incubating the base stock for a time and at a temperature sufficient for haze wax particles to form and filtering the haze base stock through a filter material having a total material surface area of at least 0.5 m2/g to up to 100 m2/g accessible to the wax particles and pores of from 0.2 to 50 microns wherein the hazy wax is removed from the base stock and is trapped by the filter and recovering the dehazed base stock as filtrate wherein said recovered dehazed base stock remains haze-free at the target haze disappearance temperature for at least fourteen days, wherein wax trapped in the filter is removed to regenerate the filter for reuse or wherein the filter material is employed in at least two filter stages used in sequence such that while a stage is in operation for dehazing a hazy base stock another stage is being regenerated, and wherein the filter material is regenerated by the process comprising the steps of:
Dependencies are inferred from the claim text.