Vanadium corrosion inhibitor

Abstract

A corrosion inhibited fuel mixture includes a hydrocarbon fuel, at least one vanadium composition, and a yttrium composition. The concentration of the yttrium composition in the mixture provides at least a stoichiometric amount of yttrium for a substantially complete reaction between the yttrium and V 2 O 5 formed from the vanadium composition when the mixture is burned. The yttrium and V 2 O 5 react to form YVO 4 . One particular yttrium composition useful as a hydrocarbon fuel soluble, water stable vanadium corrosion inhibitor incorporates a yttrium ester having at least four carbon atoms and a hydrocarbon fuel soluble chelating agent that includes 2,4-pentanedi. .e.!..Iadd.o.Iaddend.ne. The complex has a molar ratio of 2,4-pentanedi. .e.!..Iadd.o.Iaddend.ne to yttrium of up to 5:1.

We claim: 
     
       1. A fuel mixture comprising a hydrocarbon fuel and a yttrium ester/chelate complex, wherein when the hydrocarbon fuel is burned, V 2  O 5  is a by-product, and wherein the concentration of the yttrium complex in the mixture provides at least a stoichiometric amount of yttrium for a substantially complete reaction between the yttrium and V 2  O 5  whereby the yttrium and V 2  O 5  react to form YVO 4 . 
     
     
       2. The mixture of claim 1, wherein the concentration of the yttrium complex in the mixture provides at least 125% of the stoichiometric amount of yttrium required for a substantially complete reaction between the yttrium and vanadium. 
     
     
       3. The mixture of claim 1, wherein the yttrium ester comprises at least four carbon atoms and the chelating agent is hydrocarbon fuel soluble and that includes 2,4-pentanedi. .e.!..Iadd.o.Iaddend.ne and the complex has a molar ratio of 2,4-pentanedi. .e.!..Iadd.o.Iaddend.ne to yttrium of up to 5:1. 
     
     
       4. The mixture of claim 3, wherein the yttrium ester comprises four to twelve carbon atoms. 
     
     
       5. The mixture of claim 3, wherein the yttrium ester is selected from the group consisting of yttrium octonate and yttrium 2-ethyl hexanoate. 
     
     
       6. The mixture of claim 3, wherein the molar ratio of 2,4-pentanedi. .e.!..Iadd.o.Iaddend.ne to yttrium is 2:1 to 3:1. 
     
     
       7. The mixture of claim 3, wherein the yttrium ester is selected from the group consisting of yttrium octonate and yttrium 2-ethyl hexanoate and the molar ratio of 2,4-pentanedi. .e.!..Iadd.o.Iaddend.ne to yttrium is 2:1 to 3:1. 
     
     
       8. A hydrocarbon fuel soluble, water stable vanadium corrosion inhibitor yttrium ester chelate complex, comprising a yttrium ester having at least four carbon atoms and a hydrocarbon fuel soluble chelating agent that includes 2,4-pentanedi. .e.!..Iadd.o.Iaddend.ne wherein the complex has a molar ratio of 2,4-pentanedi. .e.!..Iadd.o.Iaddend.ne to yttrium of up to 5:1. 
     
     
       9. The inhibitor of claim 8, wherein the yttrium ester comprises four to twelve carbon atoms. 
     
     
       10. The inhibitor of claim 8, wherein the yttrium ester is selected from the group consisting of yttrium octonate and yttrium 2-ethyl hexanoate. 
     
     
       11. The inhibitor of claim 8, wherein the molar ratio of 2,4-pentanedi. .e.!..Iadd.o.Iaddend.ne to yttrium is 2:1 to 3:1. 
     
     
       12. The mixture of claim 9, wherein the molar ratio of 2,4-pentanedi. .e.!..Iadd.o.Iaddend.ne to yttrium is 2:1 to 3:1. 
     
     
       13. The mixture of claim 10, wherein the molar ratio of 2,4-pentanedi. .e.!..Iadd.o.Iaddend.ne to yttrium is 2:1 to 3:1.