Nanoparticles of diquaternary schiff dibases as corrosion inhibitors for protecting steel against exposure to acidic fluids

Abstract

A corrosion inhibitor for steel against exposure to acidic fluids contemplates a mass of metallic nanoparticles and a diquaternary Schiff dibase loaded on the metallic nanoparticles. In accordance with the invention, the metal nanoparticles are selected from the group consisting of silver, zinc, cobalt, manganese and mixtures thereof. The invention also contemplates a method for synthesizing an efficient corrosion inhibitor for petroleum equipment, pipelines, joints and steel plates in an acidic medium.

What is claimed is: 
     
         1 . A corrosion inhibitor for steel against exposure to an acidic fluid, said corrosion inhibitor comprising a mass of metallic nanoparticles and a diquaternary Schiff dibase loaded on said nanoparticles. 
     
     
         2 . The corrosion inhibitor according to  claim 1 , in which said nanoparticles are selected from the group consisting of silver, zinc, cobalt, manganese, gold and zinc. 
     
     
         3 . The corrosion inhibitor according to  claim 2 , in which said nanoparticles are selected from the group consisting of cobalt, silver and manganese. 
     
     
         4 . The corrosion inhibitor according to  claim 3 , in which the diquaternary Schiff dibases is selected from the group consisting of C 21 H 22 I 2 N 6 , C 21 H 23 I 2 N 4 S 2 , N,N-pentane-2,4-diylidenedipyridin-4-amine (NDSI), N,N-(3-benzylidenepentane-2,4-diylidene)dipyridin-4-amine (NBDSI), N,N-[3-(4-methoxybenzylidene)pentane-2,4-diylidene]dipyridin-4-amine (NMDSI) and N,N[3-(4-chlorobenzylidene)pentane-2,4-diylidene]dipyridin-4-amine (NCDSI). 
     
     
         5 . A corrosion inhibitor for steel against exposure to an acidic fluid according to  claim 2 , in which said corrosion inhibitor consisting of a mass of metallic nanoparticles selected from the group consisting of silver, zinc, cobalt and manganese and said diquaternary Schiff dibase selected from the group consisting of C 21 H 22 I 2 N 6  and C 21 H 23 I 2 N 4 S 2 . 
     
     
         6 . The corrosion inhibitor according to  claim 3 , in which said diquaternary Schiff dibase has a M.WT=to 612.25 g/mole. 
     
     
         7 . The corrosion inhibitor according to  claim 3 , in which said diquaternary Schiff dibase has a M.WT=to 649.36 g/mole. 
     
     
         8 . The corrosion inhibitor according to  claim 3 , in which said diquaternary Schiff dibase contains 41.20% by wgt. C, 3.62% by wgt. H, 41.45% by wgt. I and 13.73% by wgt. N. 
     
     
         9 . The corrosion inhibitor according to  claim 3 , in which said diquaternary Schiff dibase contains 38.84% by wgt. C, 3.57% by wgt. H, 39.09% by wgt. I and 8.63% by wgt. N and 9.87% by wgt. S. 
     
     
         10 . The corrosion inhibitor according to  claim 3 , in which the ratio of corrosion inhibitor to nanoparticles is about 2 molar amounts of the diquaternary Schiff dibase loaded on about 1 molar amount of nanoparticles. 
     
     
         11 . The corrosion inhibitor according to  claim 3 , in which the ratio of corrosion inhibitor to nanoparticles is 3 molar amounts of the diquaternary Schiff dibase loaded on about 1 molar amount of nanoparticles. 
     
     
         12 . The corrosion inhibitor according to  claim 11 , in which said nanoparticles are silver. 
     
     
         13 . The corrosion inhibitor according to  claim 12 , in which the particle size of said silver nanoparticles are between 15 nms and 50 nms. 
     
     
         14 . A corrosion inhibitor for steel against exposure to an acidic liquid, said corrosion inhibitor consisting of metallic nanoparticles and a diquaternary Schiff dibase loaded on said nanoparticles. 
     
     
         15 . The corrosion inhibitor according to  claim 14 , in which said nanoparticles are selected from the group consisting of cobalt, silver, manganese, gold and zinc and in which the diquaternary Schiff dibase are selected from the group consisting of C 21 H 22 I 2 N 6 , C 21 H 23 I 2 N 4 S 2 , N,N-pentane-2,4-diylidenedipyridin-4-amine (NDSI), N,N-(3-benzylidenepentane-2,4-diylidene)dipyridin-4-amine (NBDSI), N,N-[3-(4-methoxybenzylidene)pentane-2,4-diylidene]dipyridin-4-amine (NMDSI) and N,N[3-(4-chlorobenzylidene)pentane-2,4-diylidene]dipyridin-4-amine (NCDSI). 
     
     
         16 . The corrosion inhibitor according to  claim 15 , in which said nanoparticles are silver. 
     
     
         17 . A method for synthesizing an efficient corrosion inhibitor for petroleum equipment, pipelines, joints and steel plates from a corrosion reaction in an acidic medium, said method comprising the following steps:
 one mole of an acetyl acetone is reacted with 2 moles of 2-aminobenzoimidazole (1) and/or 2-aminobenzothiazole in acetone as a solvent and in the presence of p-toluene sulphonic acid as a dehydrating agent to produce a medium;   removing produced water of reaction;   changing the pH of said medium to an alkaline at a pH of about 9 using KOH alcoholic solution to produce a precipitate;   adding 2.1 moles of methyl iodide and refluxing for 6 hours for specification to produce a corrosion inhibitor having the formula C 21 H 22 I 2 N 6  or C 21 H 23 I 2 N 4 S 2 ; and   loading the corrosion inhibitor on silver, zinc, cobalt or manganese nanoparticles.   
     
     
         18 . A method for synthesizing an efficient corrosion inhibitor for petroleum equipment, pipelines, joints and steel plates from a corrosion reaction in an acidic medium, said method consisting of the following steps:
 one mole of an acetyl acetone is reacted with 2 moles of 2-aminobenzoimidazole (1) and/or 2-aminobenzothiazole in acetone as a solvent and in the presence of p-toluene sulphonic acid as a dehydrating agent to produce a medium;   removing produced water of reaction;   changing the pH of said medium to an alkaline at a pH of about 9 using KOH alcoholic solution to produce a precipitate;   adding 2.1 moles of methyl iodide and refluxing for 6 hours for specification to produce a corrosion inhibitor having the formula C 21 H 22 I 2 N 6  or C 21 H 23 I 2 N 4 S 2 ; and   loading the corrosion inhibitor on silver, zinc, cobalt or manganese nanoparticles.