Fischer-tropsch derived diesel fuel and process for making same
AssigneeChevron U.S.A. Inc.
InventorDennis J. O'Rear
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Abstract
The present invention is directed to a Fischer-Tropsch derived distillate suitable for use as a distillate fuel having a flash point 38° C. minimum measured by ASTM D 93 and a cloud point of +14° C. or less and further containing not less than 0.01 wt,% oxygen in each of 1-pentanol, 1-hexanol, 1-heptanol, 1-octanol, 1-nonanol, 1-decanol and not more than 0.01 wt.% oxygen in C11+ linear alcohols. Preferably, the Fischer-Tropsch derived distillate will have a cloud point at or below 0° C., and more preferably the cloud point of the Fischer-Tropsch derived distillate, will be at or below −15° C.
Claims22
A Fischer-Tropsch derived distillate suitable for use as a diesel fuel having a flash point 38° C. minimum measured by ASTM D 93 a cloud point of +14° C. or less and further containing not less than 0.01 wt. % oxygen in at least two alcohols selected from the group consisting of 1-pentanol, 1-hexanol, 1-heptanol, 1-octanol, 1-nonanol, 1-decanol;
- and mixtures of more than two alcohols, and not more than 0.01 wt. % oxygen in C11+ linear alcohols.
A process for preparing a Fischer-Tropsch derived distillate fuel which comprises;
- (a) separating a Fischer-Tropsch condensate into a first and second fraction, wherein:
- (i) said first fraction comprises not less than 0.01 wt. % oxygen of alcohols selected from the group consisting of 1-pentanol, 1-hexanol, 1-heptanol, 1-octanol, 1-nonanol, 1-decanol, and mixtures thereof, and not more than 0.01 wt. % oxygen in C11+ linear alcohols and
- (ii) said second fraction comprises C11+ linear alcohols;
- (b) removing the C11+ linear alcohols from at least a portion of said second fraction and recovering a treated heavy fraction substantially free of C11+ linear alcohols;
- and
- (c) blending at least a portion of the first fraction of step a(i) and a portion of the treated heavy fraction of step (b) in the proper proportion to prepare a Fischer-Tropsch derived distillate fuel wherein the sum of the oxygenate content of the C5-C10 alcohols present are within the range of from 0.01 wt. % oxygen and to 1 wt. % oxygen, the cloud point is not more than +14° C., and the flash point 38° C. minimum measured by ASTM D 93.
In a distillate fuel having a cloud point of +14° C. or less, the improvement comprising not less than 0.01 wt. % oxygen in at least two alcohols selected from the group consisting of 1-pentanol, 1-hexanol, 1-heptanol, 1-octanol, 1-nonanol, 1-decanol, and mixtures of more than two alcohols;
- and not more than 0.01 wt. % oxygen in C11+ linear alcohols.
The Fischer-Tropsch derived distillate according to claim 19 with 1-alcohols selected from the groups consisting of C5 and C6;
- C5 and C7;
- or C6 and C7.
Dependencies are inferred from the claim text.