Development of additive for mitigating ammonium chloride corrosion issues in hydrotreater

Abstract

A composition for mitigating corrosion due to ammonium chloride salt, said composition includes (a) 1.0 wt. % to 15 wt. % of an aliphatic amine selected from the group consisting of hydroxy (C1 to C10 alkyl)amines, amino (C1 to C10 alkyl)amines, (C1 to C10 alkyl)amines substituted with the group amino (C1 to C10 alkyl)amino, (C1 to C10 alkyl)amines substituted with the group N,N-di(C1 to C4 alkyl)amino, phenyl (C1 to C10 alkyl)amines and heterocyclic substituted (C1 to C10 alkyl)amines; (b) 1.0 wt. % to 10.0 wt. % of an antioxidant; (c) 1.0 wt. % to 10.0 wt. % of a neutralizer and/or pH adjusting agent; and (d) rest being a solvent, wherein the wt. % is based on the total weight of the composition. Teachings include composition for mitigating corrosion (a) due to ammonium chloride salt and (b) adding the composition in an ammonium chloride salt environment or in a reactor effluent air cooler unit in hydroprocessing unit.

We claim: 
     
         1 . A composition for mitigating corrosion due to ammonium chloride salt, said composition comprising:
 (a) 1.0 wt. % to 15 wt. % of an aliphatic amine selected from the group consisting of hydroxy (C 1  to C 10  alkyl)amines, amino (C 1  to C 10  alkyl)amines, (C 1  to C 10  alkyl)amines substituted with the group amino (C 1  to C 10  alkyl)amino, (C 1  to C 10  alkyl)amines substituted with the group N,N-di(C 1  to C 4  alkyl)amino, phenyl (C 1  to C 10  alkyl)amines and heterocyclic substituted (C 1  to C 10  alkyl)amines;   (b) 1.0 wt. % to 10.0 wt. % of an antioxidant;   (c) 1.0 wt. % to 10.0 wt. % of a neutralizer and/or pH adjusting agent; and   (d) rest being a solvent,   wherein the wt. % is based on the total weight of the composition.   
     
     
         2 . The composition as claimed in  claim 1 , wherein the aliphatic amine is (C 1  to C 10  alkyl)amines substituted with the group amino (C 1  to C 10  alkyl)amino. 
     
     
         3 . The composition as claimed in  claim 2 , wherein the (C 1  to C 10  alkyl)amines substituted with the group amino (C 1  to C 10  alkyl)amino is selected from a group consisting of diethylenetriamine, triethanolamine, triethylenetetramine, tetraethylenepentamine, isoproplyamine and combination thereof. 
     
     
         4 . The composition as claimed in  claim 1 , wherein the antioxidant is selected from the group consisting of isosorbide dimethyl ether, ascorbic acid, 2′-methylenebis-(4-methyl-6-tert-butylphenol), thiodipropionic acid didodecyl ester, sodium nitrite and combination thereof. 
     
     
         5 . The composition as claimed in  claim 1 , wherein the neutralizer and/or pH adjusting agent is selected from the group consisting of triethanolamine, aminomethyl propanol, ammonium hydroxide, sodium hydroxide, other alkali hydroxides, borates, phosphates, pyrophosphates, cocamine, oleamine, diisopropanolamine, diisopropylamine, dodecylamine, PEG-15 cocamine, morpholine, tetrakis(hydroxypropyl)ethylenediamine, triamylamine, triethanolamine, triethylamine, tromethamine 2-amino-2-(hydroxymethyl)-1,3-propanediol and combination thereof. 
     
     
         6 . The composition as claimed in  claim 1 , wherein the solvent is selected from a group consisting of polar solvent, hydrocarbon solvent and combination thereof. 
     
     
         7 . A process for preparing a composition for mitigating corrosion due to ammonium chloride salt comprising:
 i) mixing of 1.0 wt. % to 15 wt. % of an aliphatic amine selected from the group consisting of hydroxy (C 1  to C 10  alkyl)amines, amino (C 1  to C 10  alkyl)amines, (C 1  to C 10  alkyl)amines substituted with the group amino (C 1  to C 10  alkyl)amino, (C 1  to C 10  alkyl)amines substituted with the group N,N-di(C 1  to C 4  alkyl)amino, phenyl (C 1  to C 10  alkyl)amines and heterocyclic substituted (C 1  to C 10  alkyl)amines in a solvent to obtain a first mixture;   ii) adding 1.0 wt. % to 10.0 wt. % of an antioxidant to the first mixture to obtain a second mixture; and   iii) adding 1.0 wt. % to 10.0 wt. % of a neutralizer and/or pH adjusting agent to the second mixture to obtain a composition for mitigating corrosion due to ammonium chloride salt.   
     
     
         8 . The process as claimed in  claim 7 , wherein the condition includes temperature in the range of 10 to 40° C. for a period in the range of 10 to 40 minutes at a stirring speed in the range of 20 to 100 rpm. 
     
     
         9 . A method for mitigating corrosion by adding the composition as claimed in  claim 1  in an ammonium chloride salt environment or in a reactor effluent air cooler unit in a hydroprocessing unit. 
     
     
         10 . The method as claimed in  claim 9 , wherein the condition includes temperature in the range of 80 to 150° C. at a pressure in the range of 10 to 100 bar. 
     
     
         11 . A method for mitigating corrosion by adding the composition as claimed in  claim 2  in an ammonium chloride salt environment or in a reactor effluent air cooler unit in a hydroprocessing unit. 
     
     
         12 . A method for mitigating corrosion by adding the composition as claimed in  claim 3  in an ammonium chloride salt environment or in a reactor effluent air cooler unit in a hydroprocessing unit. 
     
     
         13 . A method for mitigating corrosion by adding the composition as claimed in  claim 4  in an ammonium chloride salt environment or in a reactor effluent air cooler unit in a hydroprocessing unit. 
     
     
         14 . A method for mitigating corrosion by adding the composition as claimed in  claim 5  in an ammonium chloride salt environment or in a reactor effluent air cooler unit in a hydroprocessing unit. 
     
     
         15 . A method for mitigating corrosion by adding the composition as claimed in  claim 6  in an ammonium chloride salt environment or in a reactor effluent air cooler unit in a hydroprocessing unit. 
     
     
         16 . A method for mitigating corrosion by adding the composition as claimed in as obtained according to the process claimed in  claim 7 , in an ammonium chloride salt environment or in a reactor effluent air cooler unit in a hydroprocessing unit. 
     
     
         17 . The method as claimed in  claim 16 , wherein the condition includes temperature in the range of 80 to 150° C. at a pressure in the range of 10 to 100 bar. 
     
     
         18 . Use of a composition comprising:
 (a) 1.0 wt. % to 15 wt. % of an aliphatic amine selected from the group consisting of hydroxy (C 1  to C 10  alkyl)amines, amino (C 1  to C 10  alkyl)amines, (C 1  to C 10  alkyl)amines substituted with the group amino (C 1  to C 10  alkyl)amino, (C 1  to C 10  alkyl)amines substituted with the group N,N-di(C 1  to C 4  alkyl)amino, phenyl (C 1  to C 10  alkyl)amines and heterocyclic substituted (C 1  to C 10  alkyl)amines;   (b) 1.0 wt. % to 10.0 wt. % of an antioxidant;   (c) 1.0 wt. % to 10.0 wt. % of a neutralizer and/or pH adjusting agent; and   (d) rest being a solvent,   the wt. % is based on the total weight of the composition,   as a corrosion inhibitor in an ammonium chloride salt environment or in reactor effluent air cooler unit in a hydroprocessing unit.