US2009025281A1PendingUtilityA1

Diesel fuel composition and a method to improve filterability of diesel fuel

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Individually held — no corporate assignee on recordPriority: Mar 31, 2003Filed: Sep 29, 2008Published: Jan 29, 2009
Est. expiryMar 31, 2023(expired)· nominal 20-yr term from priority
Inventors:Matthew E. GandeLeslie R. GatechairRamraj VenkatadriAndrew WaynickSteve Westbrook
C10L 1/1832C10L 1/232C10L 1/23C10L 1/2406C10L 1/231C10L 1/14C10L 1/1852C10L 1/2425C10L 1/24C10L 10/12C10L 1/2222C10L 1/1811C10L 1/223
60
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Claims

Abstract

Disclosed is a stabilized diesel fuel composition comprising a) a diesel fuel with a cetane number less than or equal to 50, b) an effective amount of at least one compound selected from the group consisting of the cetane improvers and c) i) an effective stabilizing amount of at least one compound selected from the group consisting of the stable nitroxide compounds or ii) an effective synergistic stabilizing amount of at least one compound selected from the group consisting of the stable nitroxide compounds and at least one antioxidant compound selected from the group consisting of the aromatic amine antioxidants and the hindered phenolic antioxidants. The cetane improvers are for example nitrate esters. The diesel fuel compositions exhibit improved filterability.

Claims

exact text as granted — not AI-modified
1 . A stabilized diesel fuel composition comprising
 a) a diesel fuel with a cetane number less than or equal to 50,   b) 2-ethylhexyl nitrate cetane improver and   c) i) at least one stable nitroxide compound selected from bis(1-oxyl-2,2,6,6-tetramethylpiperidin-4-yl) sebacate and 4-hydroxy-1-oxyl-2,2,6,6-tetramethylpiperidine or
 ii) at least one stable nitroxide compound selected from bis(1-oxyl-2,2,6,6-tetramethylpiperidin-4-yl) sebacate and 4-hydroxy-1-oxyl-2,2,6,6-tetramethylpiperidine and at least one antioxidant compound selected from the group consisting of aromatic amine antioxidants and hindered phenolic antioxidants, 
   
     where component c) is present from about 0.05 ppm to about 10,000 ppm, by weight, based on the weight of the entire formulation. 
   
   
       2 . A composition according to  claim 1  in which component c) is present from about 0.1 ppm to about 1000 ppm, by weight, based on the weight of the entire formulation. 
   
   
       3 . A composition according to  claim 1  in which component c) is present from about 0.2 ppm to about 100 ppm, by weight, based on the weight of the entire formulation. 
   
   
       4 . A composition according to  claim 1  in which component c) is present from about 0.5 ppm to about 25 ppm, by weight, based on the weight of the entire formulation. 
   
   
       5 . A composition according to  claim 1  comprising at least one compound selected from the group consisting of the stable nitroxide compounds and at least one antioxidant compound selected from the group consisting of the aromatic amine antioxidants and the hindered phenolic antioxidants. 
   
   
       6 . A composition according to  claim 5  in which the ratio of the stable nitroxide compounds to the antioxidant compounds is from about 1:99 to about 95:5 parts by weight. 
   
   
       7 . A composition according to  claim 5  in which the ratio of the stable nitroxide compounds to the antioxidant compounds is from about 1:10 to about 10:1 parts by weight. 
   
   
       8 . A composition according to  claim 5  in which the ratio of the stable nitroxide compounds to the antioxidant compounds is from about 1:5 to about 5:1 parts by weight. 
   
   
       9 . A composition according to  claim 5  in which the ratio of the stable nitroxide compounds to the antioxidant compounds is from about 1:3 to about 3:1 parts by weight. 
   
   
       10 . A process for improving the filterability and improving the cetane number of a diesel fuel, which process comprises
 adding to a diesel fuel with a cetane number less than or equal to 50,   b) 2-ethylhexyl nitrate cetane improver and   c) i) at least one stable nitroxide compound selected from bis(1-oxyl-2,2,6,6-tetramethylpiperidin-4-yl) sebacate and 4-hydroxy-1-oxyl-2,2,6,6-tetramethylpiperidine or
 ii) at least one stable nitroxide compound selected from bis(1-oxyl-2,2,6,6-tetramethylpiperidin-4-yl) sebacate and 4-hydroxy-1-oxyl-2,2,6,6-tetramethylpiperidine and at least one antioxidant compound selected from the group consisting of aromatic amine antioxidants and hindered phenolic antioxidants, 
   
     where component c) is added from about 0.05 ppm to about 10,000 ppm, by weight, based on the weight of the entire formulation.

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