Patent RU-2641148-C2 (RU)
Title: Corrosion inhibitor to protect equipment for production of crude oil, pipelines and reservoirs for crude oil and method of its production
Inventor: GAZDZIK BARBARA
IPC: C23F11/14
Filed: 2014-05-05
Granted: 2018-01-16
Abstract: FIELD: oil and gas industry. 
     SUBSTANCE: inhibitor containing imidazoline derivatives, oxyethylenated fatty monoamines and alcoholic solvents containing, wt %: component a) in amount of 0.155-85 produced in the result of the following processes: a) neutralizing 0.1-50 wt % i) produced mixture of modified imidazoline derivatives of said formulae (1) and (2), said mixture being the condensation product of diethylenetriamine (DETA) with fatty acids containing 12-22 atoms of C and aliphatic dicarboxylic acids containing 4-12 atoms of C with molar ratio of DETA to fatty acids and aliphatic dicarboxylic acids 1:0.80-0.99:0.01-0.10 at the temperature of at least 140°C to produce the mixture of aminoamides of said general formulae (3) and (4), after which the temperature is raised to more than 180°C and condensation reaction is carried out further up to produce the mixture of said formulae (1) and (2) compounds, possibly with addition of 0.05-20 wt % ii) condensation product of DETA with fatty acids containing 12-24 atoms of C produced at temperature of 180-280°C with general said formula (1') with aliphatic and/or aromatic monocarboxylic acid containing 1-7 atoms of C in amount from 0.025 to 25 wt % of total inhibitor weight with weight ratio of mixture compounds of general formulae (1), (2) and, possibly,(1') to said monocarboxylic acid 1:0.15-0.70 to produce intermediate product representing a mixture of compounds of general formulae (5), (6) and, possibly, (5') as well as a mixture of non-neutralised compounds of formulae (1), (2) and, possibly, (1'); and b) further neutralizing the resulting intermediate product, wherein said intermediate product is a mixture of compounds of general formulae (5), (6) and, possibly, (5 ') and a mixture of non-neutralised compounds of general formulae (1), (2) and, possibly, (1') by treatment with fatty acids containing 12-22 atoms of C in amount of 0.03-wt % of inhibitor total weight and/or polymers of fatty acids containing 18-54 atoms of C in amount of 0.03-10 wt % of inhibitor total weight at total weight ratio of said mixture of compounds of general formulae (1), (2) and, possibly, (1') to said fatty acids and/or polymers 1:0.02-0.5 to produce the product containing a mixture of compounds of formulae (7), (8) and, possibly, (7'), wherein, after the process is completed b) component a) selected from the group consisting of a) having pH value 6.5-7.5 and containing a product representing a mixture of compounds of said formulae (5), (6) and, possibly, (5'), and a product representing a mixture of compounds of formulae (7), (8) and, possibly, (7'), component B) representing oxyethylenated fatty amines containing from 14 to 22 atoms of C and 2-22 ethoxy groups per molecule in amount of 0.01-20 wt %, possibly, component c) which is aliphatic polyols in amount of 0.1-50 wt %. component d) representing aliphatic alcohols containing 1-6 atoms of C per molecule in amount of 15-99.6 wt % possibly with addition of water, as well as, possibly, component e) representing anti-foaming agent in amount of 0.01-2 wt % %. Method for producing said corrosion inhibitor comprises: I) preparation of component a) in reaction medium containing component d) which is aliphatic alcohols containing 1-6 atoms of C in amount of 15-90.6 wt %, possibly, with addition of water, comprising: A)-neutralizstion of I) produced mixture of modified derivatives of imidazoline of general formulae (1) and (2), wherein the mixture is the condensation product of DETA with fatty acids containing 12-22 atoms of C and aliphatic dicarboxylic acids containing 4-12 atoms of C, with molar ratio of DETA to fatty acids and aliphatic dicarboxylic acids 1:0.80-0.99:0.01-0.10, at a temperature of at least 140°C to produce a mixture of aminoamides of general formulae (3) and (4), after which the temperature is raised above 180°C and the condensation reaction is continued until a mixture of compounds of formulae (1) and (2) in amount of 0.1-50 wt % is produced, possibly, with addition of 0.05-20 wt % of ii) condensation product of DETA with fatty acids containing 12-24 atoms of C produced at temperature of 180-280°C of general formula (1'), with aliphatic and/or aromatic monocarboxylic acid containing 1-7 atoms of C in amount from 0.025 to 25 wt %, with weight ratio of the mixture of compounds of formulae (1), (2) and, possibly, (1') to said monocarboxylic acid 1:0.15-0.70 to produce the intermediate product containing a mixture of compounds of formulae (5), (6) and, possibly, (5') and a mixture of non-neutralised compounds (1), (2) and, possibly, (1'), and b) further neutralisation of produced intermediate product containing a mixture of compounds of general formulae (5), (6) and, possibly, (5') and a mixture of non-neutralised compounds of general formulae (1), (2) and, possibly, (1') by treatment with fatty acids containing 12-22 atoms of C in amount of 0.03-10 wt %, and/or polymers of fatty acids containing 18-54 atoms of C in amount of 0.03-10 wt % at weight ratio of total weight of mixture of compounds of formulae (1), (2) and, possibly, (1') to said fatty acids and/or polymers 1: 0.02-0.5 to produce a product containing a mixture of compounds of formulae (7), (8) and, possibly, (7'), the process b) is carried out until the reaction mixture reaches 6.5-7.5 pHand component a) is produced containing a product representing a mixture of compounds of formulae (5), (6) and, possibly, (5'), and a product a which is a mixture of compounds of formulae (7), (8) and, possibly, (7'); II) adding to component a) in amount of 0.155-85 wt % and to said component d) of additional inhibitor components, wt %: component b)-ethoxylated fatty amines containing 14-22 atoms of C and 2-20 ethoxy groups per molecule in amount of 0.01-20, possibly, component c) aliphatic polyols in amount of 0.1-50 and, finally, possibly, component e) defoamer in amount of 0.01-2. The invention is developed in dependent claims. 
     EFFECT: increase of inhibition efficiency. 
     9 cl, 1 tbl, 13 ex