초록 ▼

The present invention relates to a stable blended diesel fuel comprising an olefinic diesel fuel blending stock. The olefinic diesel fuel blending stock of the invention comprises olefins in an amount of 2 to 80 weight percent, non-olefins in an amount of 20 to 98 weight percent wherein the non-olef

The present invention relates to a stable blended diesel fuel comprising an olefinic diesel fuel blending stock. The olefinic diesel fuel blending stock of the invention comprises olefins in an amount of 2 to 80 weight percent, non-olefins in an amount of 20 to 98 weight percent wherein the non-olefins are substantially comprised of paraffins, oxygenates in an amount of at least 0.012 weight percent and sulfur in an amount of less than 1 ppm. To provide acceptable stability, the blended diesel fuel comprising the olefinic diesel fuel blending stock comprises a sulfur-free antioxidant. The blended diesel fuel comprising the olefinic diesel fuel blending stock and sulfur-free antioxidant added has a peroxide content of less than 5 ppm when stored at 60° C. for 4 weeks. The present invention also relates to processes for making the stable blended diesel fuel and olefinic diesel fuel blending stocks as defined above.

대표청구항 ▼

The invention claimed is: 1. A blended diesel fuel comprising: a) a diesel fuel fraction comprising olefins in an amount of 25 to 80 weight %; non-olefins in an amount of 20 to 75 weight %, wherein the non-olefins comprise greater than 50 weight % paraffins; and oxygenates in an amount of at least

The invention claimed is: 1. A blended diesel fuel comprising: a) a diesel fuel fraction comprising olefins in an amount of 25 to 80 weight %; non-olefins in an amount of 20 to 75 weight %, wherein the non-olefins comprise greater than 50 weight % paraffins; and oxygenates in an amount of at least 0.012 weight %; b) a diesel fuel fraction selected from the group consisting of a hydrotreated Fischer Tropsch derived diesel, a hydrocracked Fischer Tropsch derived diesel, a hydrotreated petroleum derived diesel, and a hydrocracked petroleum derived diesel, and mixtures thereof; and c) an effective amount of at least one sulfur-free antioxidant from the group consisting of phenols, cyclic amines, and combinations thereof; wherein at least a portion of the blended diesel fuel is derived from Fischer Tropsch synthesis products and the blended diesel fuel comprises sulfur in an amount of less than 1 ppm, and has a reflectance as measured by ASTM D6468 of greater than 65% when measured at 150° C. for 90 minutes and a peroxide number of less than 5 ppm after storage at 60° C. for four weeks. 2. The blended diesel fuel according to claim 1, comprising 5 to 500 ppm of the at least one sulfur-free antioxidant. 3. The blended diesel fuel according to claim 1, comprising 8 to 200 ppm of the at least one sulfur-free antioxidant. 4. The blended diesel fuel according to claim 1, comprising 20 to 100 ppm of the at least one sulfur-free antioxidant. 5. The blended diesel fuel according to claim 1, wherein the at least one sulfur-free antioxidant is a cyclic amine having the following formula: wherein: A is a six-membered cycloalkyl or aryl ring, R1, R2, R3, and R4 are independently H or alkyl; and x is 1 or 2. 6. The blended diesel fuel according to claim 1, wherein the at least one sulfur-free antioxidant is an alkylphenol having the formula: wherein R5 and R6 are independently H or alkyl and n is 1 or 2. 7. The blended diesel fuel according to claim 1, wherein the at least one sulfur-free antioxidant is selected from the group consisting of 4,4'-methylene-bis(2,6-di-tert-butylphenol), 4,4'-bis(2-methyl-6-tert-butylphenol), 2,2'-methylene-bis(4-methyl-6-tert-butyl-phenol),-4,4'-butylidene-bis(3-methyl-6-tert-butylphenol), 4,4'-isopropylidene-bis(2,6-di-tert-butylphenol), 2,2'-methylene-bis(4-methyl-6-nonylphenol, 2,2'-isobutylidene-bis(4,6-dimethylphenol), 2,2'-methylene-bis(4-methyl-6-cyclohexylphenol), 2,6-di-tertbutyl-4-methylphenol, 2,6-di-tertbutyl-4-ethylphenol, 2,4-dimethyl-6-tert-butyl-phenol, 2,6-di-tert-butyl-dimethylamino-p-cresol, 2,6-di-tert-4-(N,N'-dimethyl-aminomethylphenol), bis(3,5-di-tert-butyl-4-hydroxybenzyl), alkylated diphenylamine, phenyl-alpha-naphthylamine, alkylated-alpha-naphthylamine, and mixtures thereof. 8. The blended diesel fuel according to claim 1, wherein the at least one sulfur-free antioxidant is selected from the group consisting of dimethylcyclohexylamine, N,N'-di-sec-butyl-p-phenylenediamine, 2,6-di-tert-butylphenol, 4-tert-butylphenol, 2-tert-butylphenol, 2,4,6-tri-tert-butylphenol, and mixtures thereof. 9. The blended diesel fuel according to claim 1, wherein the at least one sulfur-free antioxidant is a blend of a phenol and a cyclic amine. 10. The blended diesel fuel according to claim 1, wherein the peroxide number is less than 4 ppm after storage at 60° C. for four weeks. 11. The blended diesel fuel according to claim 1, wherein the peroxide number is less than 1 ppm after storage at 60° C. for four weeks. 12. The blended diesel fuel according to claim 1, wherein the reflectance as measured by ASTM D6468 is greater than 80% when measured at 150° C. for 90 minutes. 13. The blended diesel fuel according to claim 1, wherein the reflectance as measured by ASTM D6468 is greater than 90% when measured at 150° C. for 90 minutes. 14. The blended diesel fuel according to claim 1, wherein at least a portion of the diesel fuel is derived from a petroleum derived distillate. 15. The blended diesel fuel according to claim 1, further comprising a lubricity additive in an amount to provide an ASTM D6079 wear scar of 450 microns or less. 16. The blended diesel fuel according to claim 15, wherein the lubricity additive is an ester. 17. The blended diesel fuel according to claim 16, wherein the diesel fuel has a reflectance as measured by ASTM D6468 of greater than 65% when measured at 150° C. for 180 minutes, an ASTM D6079 wear scar of 450 microns or less, and a peroxide content of less than 5 ppm after storage at 60° C. for four weeks. 18. A blended diesel fuel comprising: a) a Fischer Tropsch diesel fuel fraction comprising i) olefins in an amount of 25 to 80 weight %, ii) non-olefins in an amount of 20 to 75 weight %, wherein the non-olefins comprise greater than 50 weight % paraffins, wherein the paraffins have an i/n ratio of less than 1; and iii) oxygenates in an amount of at least 0.012 weight %; b) a diesel fuel fraction selected from the group consisting of a hydrocracked Fischer Tropsch derived diesel, a hydrotreated Fischer Tropsch derived diesel, a hydrocracked petroleum derived diesel, a hydrotreated petroleum derived diesel, and mixtures thereof; c) an effective amount of a sulfur-free antioxidant; and d) sulfur in an amount of less than 1 ppm, wherein the blended diesel fuel has a reflectance as measured by ASTM D6468 of greater than 65% when measured at 150° C. for 90 minutes and a peroxide number of less than 5 ppm after storage at 60° C. for four weeks. 19. The blended diesel fuel according to claim 18, comprising 5 to 500 ppm of the at least one sulfur-free antioxidant. 20. The blended diesel fuel according to claim 18, comprising 20 to 100 ppm of the at least one sulfur-free antioxidant. 21. The blended diesel fuel according to claim 18, wherein the at least one sulfur-free antioxidant is selected from the group consisting of phenols, cyclic amines, and combinations thereof. 22. The blended diesel fuel according to claim 18, wherein the blended diesel fuel comprises 5 to 80 weight % Fischer-Tropsch diesel fuel fraction of (a) and 20 to 95 weight % diesel fuel fraction of (b). 23. A Fischer Tropsch diesel blend component comprising: a) olefins in an amount of 25 to 80 weight %, b) non-olefins in an amount of 20 to 75 weight %, wherein the non-olefins comprise greater than 50 weight % paraffins, wherein the paraffins have an i/n ratio of less than 1; and c) oxygenates in an amount of at least 0.012 weight %; d) a sulfur-free antioxidant; and e) sulfur in an amount of less than 1 ppm by weight wherein the Fischer Tropsch diesel blend component has a peroxide number of less than 5 ppm after storage at 60° C. for four weeks.