1. A method for controlling the soot induced viscosity increase of conventionalmineral oil derived base stock or base oil lubricating oils used in diesel engines during use by adding to the lubricating oil about 10 to 80 wt % of a GTL base stock andor base oil andor hydrodewaxed or hydroisomerizedcatalytic (or solvent) dewaxed base stock or base oil, based on the weight of the total base oil.
2. A method for controlling the soot induced viscosity increase of lubricating oils used in diesel engines during use by employing as the diesel engine lubricating oil an oil formulation comprising a base stock or base oil containing about 10 to 80 wt % of a GTL base stock andor base oil andor hydrodewaxed or hydroisomerizedcatalytic (or solvent) dewaxed base stock andor base oil in combination with about 90 to 20 wt % of a conventional petroleummineral oil derived base stock, based on the weight of the total base oil.
3. The method of claim 1 or 2 wherein the amount of GTL base stock andor base oil andor hydrodewaxed or hydroisomerizedcatalytic (or solvent) dewaxed base stock andor base oil is in the range of about 10 to 70 wt % based on the weight of the total base oil.
4. The method of claim 1 or 2 wherein the conventional petroleummineral oil derived base stock is a Group I andor Group II base stock.
5. The method of claim 4 wherein the conventional petroleummineral oil derived base stock is a Group I base stock.
6. The method of claim 1 or 2 wherein the GTL base stock andor base oil andor hydrodewaxed or hydroisomerizedcatalytic (or solvent) dewaxed base stock andor base oil has a kinematic viscosity at 100\xb0 C. in the range of about 2 to 50 mm2s.
7. The method of claim 1 or 2 wherein the GTL base stock andor base oil andor hydrodewaxed or hydroisomerizedcatalytic (or solvent) dewaxed base stock andor base oil has a kinematic viscosity at 100\xb0 C. in the range of about 3 to 40 mm2s.
8. The method of claim 1 or 2 wherein the GTL base stock andor base oil andor hydrodewaxed or hydroisomerizedcatalytic (or solvent) dewaxed base stock andor base oil has a kinematic viscosity at 100\xb0 C. in the range of about 3.5 to 30 mm2s.
9. The method of claim 2 wherein the conventional petroleummineral oil derived base stock has a kinematic viscosity at 100\xb0 C. in the range of about 2 to 20 mm2s.
10. The method of claim 4 wherein the conventional petroleummineral oil derived base stock has a kinematic viscosity at 100\xb0 C. in the range of about 4 to 10 mm2s.
11. The method of claim 5 wherein the conventional petroleummineral oil derived base stock has a kinematic viscosity at 100\xb0 C. in the range of about 4 to 8 mm2s.
12. The method of claim 1 or 2 wherein the GTL base stock andor base oil andor hydrodewaxed or hydroisomerizedcatalytic (or solvent) dewaxed base stock andor base oil has a kinematic viscosity at 100\xb0 C. in the range of about 3.5 to 30 mm2s and the conventional petroleummineral oil derived stock is a Group I andor Group II stock which has a kinematic viscosity at 100\xb0 C. in the range of about 4 to 8 mm2s.
13. A diesel engine lubricating oil formulation resistant to soot induced viscosity increase during use comprising a base oil containing about 10 to 80 wt % GTL base stock andor base oil andor hydrodewaxed or hydroisomerizedcatalytic (or solvent) dewaxed base stock andor base oil, about 90 to 20 wt % of a conventional petroleummineral oil derived base oil, based on the weight of the total base oil and about 1 to 25 wt % on an as received basis of a polymeric viscosity modifying additive, based on the total weight of the lubricating oil formulation.
14. The diesel engine lubricating oil formulation of claim 13 wherein the GTL base stock andor base oil andor hydrodewaxed or hydroisomerizedcatalytic (or solvent) dewaxed base stock andor base oil comprises about 10 to 70 wt % of the total base oil.
15. The diesel engine lubricating oil formulation of claim 13 wherein the GTL base stock andor base oil andor hydrodewaxed or hydroisomerizedcatalytic (or solvent) dewaxed base stock andor base oil comprises about 10 to 60 wt % of the total base oil.
16. The diesel engine lubricating oil formulation of claim 13, 14 or 15 wherein the conventional petroleummineral oil derived base oil is a Group I andor Group II base oil.
17. The diesel engine lubricating oil formulation of claim 16 wherein the base oil is a Group I base oil.
18. The diesel engine lubricating oil formulation of claim 13, 14 or 15 wherein the polymeric viscosity modifying additive is present in an amount in the range of about 5 to 25 wt % on an as received base, based on the total weight of the lubricating oil formulation.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A pre-purification unit of a cryogenic air separation unit, which is a thermal swing adsorption pre-purification unit comprising a column packed with a hydrocarbon adsorbent that comprises a zeolite with a H-FER structure or a MOR structure in which a pore diameter has been adjusted by ion exchange.
2. A pre-purification unit according to claim 1, wherein said column is packed with sequential layers of activated alumina, a NaX zeolite, and said hydrocarbon adsorbent.
3. A pre-purification unit of a cryogenic air separation unit, which is a thermal swing adsorption pre-purification unit comprising a column packed with a propane adsorbent that comprises a zeolite with a MFI structure.
4. A pre-purification unit according to claim 3, wherein said column is packed with sequential layers of activated alumina, a NaX zeolite, and said propane adsorbent.
5. An adsorbent that is used in a pre-purification unit of a cryogenic air separation unit, wherein said adsorbent is a hydrocarbon adsorbent comprising a zeolite that has at least one straight channel.
6. A hydrocarbon adsorbent according to claim 5, wherein said hydrocarbon adsorbent has a H-FER structure.
7. A hydrocarbon adsorbent according to claim 5, wherein said hydrocarbon adsorbent has a MOR structure in which a pore diameter has been adjusted by ion exchange.
8. An adsorbent that is used in a pre-purification unit of a cryogenic air separation unit, wherein said adsorbent is a propane adsorbent comprising a zeolite with a MFI structure.
9. A propane adsorbent according to claim 8, wherein said propane adsorbent has a pore diameter, formed by ion exchange, that is substantially equal to a size of a propane molecular ion.
10. A propane adsorbent according to claim 9, wherein said ion exchange is conducted using either one, or two or more elements selected from the group consisting of Na, Cu, Li, K, Mg, Ca, Zn, Ag, Ba, Cs, Rb, and Sr.
11. An adsorbent that is used in a pre-purification unit of a cryogenic air separation unit, wherein said adsorbent is a propane adsorbent comprising a zeolite that has at least one straight channel, and has a SiAl ratio of no more than 100.
12. A method of pre-treating feed air, comprising using a pre-purification unit according to claim 1 to reduce a hydrocarbon concentration within liquid oxygen inside said cryogenic air separation unit.
13. A method of pre-treating feed air, comprising using a pre-purification unit according to claim 3 to reduce propane concentration within liquid oxygen inside said cryogenic air separation unit.