Alkyl ethanolamine and biocide combination for hydrocarbon based fuels

Abstract

A microorganism control combination for water-liquid hydrocarbon systems is disclosed. The combination is a biocidal control agent and an alkylamine ethoxylate of the formula R X N(CH 2 CH 2 OH) Y wherein R is C 3 to C 18 alkyl or isoalkyl group, X and Y are 1 or 2, Z is 0 or 1, X+Y is not greater than 3, when X or Y is 2 than Z is 0 and when X is 2 the R groups are the same or different C 3 to C 18 alkyl or isoalkyl groups. The combination provides effective microorganism control with reduced concentration of biocidal control agent.

1 . A method of inhibiting the growth of microorganisms in a water-liquid hydrocarbon system comprising adding to said system a biocidially effective amount of a combination of a biocidal agent and at least one alkyl ethanolamine of the formula  
         R X NH Z (CH 2 CH 2 OH) Y   wherein R is C 3  to C 18  alkyl or isoalkyl group, X and Y are 1 or 2, Z is 0 or 1, X+Y is not greater than 3, when X or Y is 2 than Z is 0 and when X is 2 the R groups are the same or different C 3  to C 18  alkyl or isoalkyl groups.    
     
     
         2 . The method of  claim 1  wherein said liquid hydrocarbon is diesel fuel, heating oil, jet fuel or kerosene.  
     
     
         3 . The method of  claim 1  wherein said biocidal agent is benzisothiazolin-3-one.  
     
     
         4 . The method of  claim 1  wherein said biocidal agent is 2-methyl-5-chloro-4-isothiazolin-3-one.  
     
     
         5 . The method of  claim 1  wherein said biocidal agent is 2-(thiocyanomethylthio)benzothiazole.  
     
     
         6 . The method of  claim 1  wherein said alkylamine ethoxylate is butyl diethanol amine, butylaminoethanol, diisopropylaminoethanol or mixtures thereof.  
     
     
         7 . The method of  claim 1  wherein the ratio of biocidal agent to alkylamine ethoxylate is from about 1:50 to about 2:1.  
     
     
         8 . The method of  claim 1  wherein said biocidal agent is added in a concentration of about 100 ppm to about 500 ppm of said system.  
     
     
         9 . The method of  claim 1  wherein said systems further comprises emulsifiers, detergents, pH adjusting agents or mixtures thereof.  
     
     
         10 . The method of  claim 1  wherein said alkylamine ethoxylate is added in a concentration of about 1000 ppm to about 5000 ppm.  
     
     
         11 . A microorganism control combination comprising a biocidal agent and at least one alkyl ethanolamine of the formula  
         R X N(CH 2 CH 2 OH) Y   wherein R is C 3  to C 18  alkyl or isoalkyl group, X and Y are 1 or 2, Z is 0 or 1, X+Y is not greater than 3, when X or Y is 2 than Z is 0 and when X is 2 the R groups are the same or different C 3  to C 18  alkyl or isoalkyl groups.    
     
     
         12 . The method of  claim 11  wherein said biocidal agent is benzisothiazolin-3-one.  
     
     
         13 . The method of  claim 11  wherein said biocidal agent is 2-methyl-5-chloro-4-isothiazolin-3-one.  
     
     
         14 . The method of  claim 11  wherein said biocidal agent is 2-(thiocyanomethylthio)benzothiazole.  
     
     
         15 . The combination of  claim 11  wherein said alkylamine ethoxylate is butyl diethanol amine, butylaminoethanol, diisopropylaminoethanol or mixtures thereof.  
     
     
         16 . The combination of  claim 11  wherein said ratio of biocidal agent to alkylamine ethoxylate is from about 1:50 to about 2:1.