Additive compositions for improving the lacquering resistance of higher grade fuels of the diesel or biodiesel type

Abstract

Disclosed are additive compositions for superior quality diesel and biodiesel fuels for improving the lacquering resistance of fuels, in particular those intended for engines provided with Euro 4 to Euro 6 fuel injection systems. The additive compositions include at least one antioxidant of hindered phenol type and at least one metal passivator.

1 . A method of improving a lacquering resistance of higher-grade diesel and biodiesel fuels comprising a step of adding additive compositions into the higher-grade diesel and biodiesel fuels, the compositions comprising at least one antioxidant of a hindered phenol type a/ and at least one metal passivator b/. 
     
     
         2 . The method according to  claim 1 , wherein the antioxidant or antioxidants of the hindered phenol type a/ are selected from di-t-butyl-2,6-methyl-4-phenol (BHT), t-butyl hydroquinone (TBHQ), 2,6- and 2,4-di-t-butyl phenol, 2,4-dimethyl-6-t-butyl phenol, pyrogallol, tocopherol, 4,4′-methylene bis(2,6-di-t-butyl phenol) (CAS No. 118-82-1), alone or in a mixture. 
     
     
         3 . The method according to  claim 1 , wherein the passivator or passivators are selected from amines substituted with triazole groups, alone or in a mixture. 
     
     
         4 . The method according to  claim 3 , wherein the metal passivator or passivators are selected from N,N-bis(2-ethylhexyl)-1,2,4-triazol-1-ylmethanamine (CAS 91273-04-0), N,N′-bis(2 ethylhexyl)-4-methyl-1H-benzotriazol-1-methyl-amine (CAS 80584-90-3), N,N-bis(heptyl)-ar-methyl-1H-benzotriazole-1-methanamine, N,N-bis(nonyl)-ar-methyl-1H-benzotriazole-1-methanamine, N,N-bis(decyl)-ar-methyl-1H-benzotriazole-1-methanamine, N,N-bis(undecyl)-ar-methyl-1H-benzotriazole-1-methanamine, N,N-bis(dodecyl)-ar-methyl-1H-benzotriazole-1-methanamine, N,N-bis(2-ethylhexyl)-ar-methyl-1H-benzotriazole-1-methanamine, 1,2,4-triazoles, benzimidazoles, 2-alkyldithiobenzimidazoles; 2-alkyldithiobenzothiazoles; 2-(N,N-dialkyldithiocarbamoyl)benzothiazoles; 2,5-bis(alkyldithio)-1,3,4-thiadiazoles such as 2,5-bis(tert-octyldithio)-1,3,4-thiadiazole, 2,5-bis(tert-nonyldithio)-1,3,4-thiadiazole, 2,5-bis(tert-decyldithio)-1,3,4-thiadiazole, 2,5-bis(tert-undecyldithio)-1,3,4-thiadiazole, 2,5-bis(tert-dodecyldithio)-1,3,4-thiadiazole, 2,5-bis(tert-tridecyldithio)-1,3,4-thiadiazole, 2,5-bis(tert-tetradecyldithio)-1,3,4-thiadiazole, 2,5-bis(tert-pentadecyldithio)-1,3,4-thiadiazole, 2,5-bis(tert-hexadecyldithio)-1,3,4-thiadiazole, 2,5-bis(tert-heptadecyldithio)-1,3,4-thiadiazole, 2,5-bis(tert-octadecyldithio)-1,3,4-thiadiazole, 2,5-bis(tert-nonadecyldithio)-1,3,4-thiadiazole, 2,5-bis(tert-eicosyldithio)-1,3,4-thiadiazole; 2,5-bis(N,N-dialkyldithiocarbamoyl)-1,3,4-thiadiazoles; 2-alkyldithio-5-mercaptothiadiazoles, alone or in a mixture. 
     
     
         5 . The method according to  claim 1 , wherein the additive compositions additionally contain one or more other additives, selected from:
 at least one cold resistance additive;   at least one tracer or marker;   at least one perfuming and/or odour-masking and/or reodorizing agent;   at least one biocide;   at least one metal deactivator; and   one or more deposit reducers/dispersants.   
     
     
         6 . The method according to  claim 1 , wherein the additive compositions additionally contain a solvent. 
     
     
         7 . Diesel or biodiesel fuels with improved lacquering resistance, the fuel comprising an addition of at least 50 ppm w/w of deposit reducer(s)/dispersants and at least one composition comprising at least one antioxidant of a hindered phenol type a/ and at least one metal passivator b/ selected from amines substituted with triazole groups. 
     
     
         8 . The diesel or biodiesel fuels according to  claim 7 , wherein their concentration of additives a/ and b/ respectively is between 2 and 200 ppm w/w. 
     
     
         9 . The diesel or biodiesel fuels according to  claim 7 , wherein the antioxidant or antioxidants of the hindered phenol type a/ are selected from di-t-butyl-2,6-methyl-4-phenol (BHT), t-butyl hydroquinone (TBHQ), 2,6- and 2,4-di-t-butyl phenol, 2,4-dimethyl-6-t-butyl phenol, pyrogallol, tocopherol, 4,4′-methylene bis(2,6-di-t-butyl phenol) (CAS No. 118-82-1), alone or in a mixture. 
     
     
         10 . The diesel or biodiesel fuels according to  claim 7 , wherein the metal passivator or passivators are selected from N,N-bis(2-ethylhexyl)-1,2,4-triazol-1-ylmethanamine (CAS 91273-04-0), N,N′-bis(2 ethylhexyl)-4-methyl-1H-benzotriazol-1-methyl-amine (CAS 80584-90-3), N,N-bis(heptyl)-ar-methyl-1H-benzotriazole-1-methanamine, N, N-bis(nonyl)-ar-methyl-1H-benzotriazole-1-methanamine, N,N-bis(decyl)-ar-methyl-1H-benzotriazole-1-methanamine, N,N-bis(undecyl)-ar-methyl-1H-benzotriazole-1-methanamine, N,N-bis(dodecyl)-ar-methyl-1H-benzotriazole-1-methanamine, N,N-bis(2-ethylhexyl)-ar-methyl-1H-benzotriazole-1-methanamine, 1,2,4-triazoles, benzimidazoles, 2-alkyldithiobenzimidazoles; 2-alkyldithiobenzothiazoles; 2-(N,N-dialkyldithiocarbamoyl)benzothiazoles; 2,5-bis(alkyldithio)-1,3,4-thiadiazoles such as 2,5-bis(tert-octyldithio)-1,3,4-thiadiazole, 2,5-bis(tert-nonyldithio)-1,3,4-thiadiazole, 2,5-bis(tert-decyldithio)-1,3,4-thiadiazole, 2,5-bis(tert-undecyldithio)-1,3,4-thiadiazole, 2,5-bis(tert-dodecyldithio)-1,3,4-thiadiazole, 2,5-bis(tert-tridecyldithio)-1,3,4-thiadiazole, 2,5-bis(tert-tetradecyldithio)-1,3,4-thiadiazole, 2,5-bis(tert-pentadecyldithio)-1,3,4-thiadiazole, 2,5-bis(tert-hexadecyldithio)-1,3,4-thiadiazole, 2,5-bis(tert-heptadecyldithio)-1,3,4-thiadiazole, 2,5-bis(tert-octadecyldithio)-1,3,4-thiadiazole, 2,5-bis(tert-nonadecyldithio)-1,3,4-thiadiazole, 2,5-bis(tert-eicosyldithio)-1,3,4-thiadiazole; 2,5-bis(N,N-dialkyldithiocarbamoyl)-1,3,4-thiadiazoles; 2-alkyldithio-5-mercaptothiadiazoles, alone or in a mixture. 
     
     
         11 . The diesel or biodiesel fuels according to  claim 7 , further comprising one or more other additives, selected from:
 at least one cold resistance additive;   at least one tracer or marker;   at least one perfuming and/or odour-masking and/or reodorizing agent;   at least one biocide;   at least one metal deactivator.   
     
     
         12 . The diesel or biodiesel fuels according to  claim 7 , further comprising a solvent. 
     
     
         13 . The diesel or biodiesel fuels according to  claim 12 , further comprising the solvent and a co-solvent. 
     
     
         14 . The diesel or biodiesel fuels according to  claim 8 , wherein their concentration of additives a/ and b/ respectively is between 10 and 50 ppm w/w. 
     
     
         15 . The method according to  claim 6 , wherein the additive compositions contain a solvent and a co-solvent.