CN104370819A - Preparation method and application of water-soluble imidazoline amide corrosion inhibitor - Google Patents

Preparation method and application of water-soluble imidazoline amide corrosion inhibitor Download PDF

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CN104370819A
CN104370819A CN201410568119.9A CN201410568119A CN104370819A CN 104370819 A CN104370819 A CN 104370819A CN 201410568119 A CN201410568119 A CN 201410568119A CN 104370819 A CN104370819 A CN 104370819A
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water
corrosion inhibitor
amide
acid
imidazoline amide
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CN104370819B (en
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颜梦秋
葛圣才
戴泽青
安捷
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GPRO NEW MATERIALS Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D233/00—Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, not condensed with other rings
    • C07D233/04—Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, not condensed with other rings having one double bond between ring members or between a ring member and a non-ring member
    • C07D233/20—Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, not condensed with other rings having one double bond between ring members or between a ring member and a non-ring member with substituted hydrocarbon radicals, directly attached to ring carbon atoms
    • C07D233/24—Radicals substituted by nitrogen atoms not forming part of a nitro radical
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
    • C23F11/08—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids
    • C23F11/10—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids using organic inhibitors
    • C23F11/14—Nitrogen-containing compounds
    • C23F11/149—Heterocyclic compounds containing nitrogen as hetero atom

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  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)

Abstract

The invention discloses a preparation method and application of a water-soluble imidazoline amide corrosion inhibitor. The preparation method comprises the following successive steps: A, carrying out condensation dehydration on organic acid and organic polyamine to generate organic acid amide; B, carrying out condensation dehydration on dimer acid and organic acid amide obtained from the step A to connect the organic acid amide to the dimer acid, and then intramolecularly dehydrating to generate the imidazoline amide; and C, carrying out addition reaction on imidazoline amide obtained from the step B and olefine acid to generate the water-soluble imidazoline amide corrosion inhibitor, wherein the number-average molecular weight of the water-soluble imidazoline amide corrosion inhibitor is 1000-3000. The preparation method of the water-soluble imidazoline amide corrosion inhibitor is easy to prepare and low in cost. Compared with a similar corrosion inhibitor in the prior art, the water-soluble imidazoline amide corrosion inhibitor prepared through the method disclosed by the invention has the advantages of high corrosion inhibition rate, good chemical stability and heat stability and convenience for field operation and achieves good stability in the presence of strong alkali without causing oil-water emulsification.

Description

A kind of preparation method of water-soluble imidazoline amide corrosion inhibitor and application thereof
Technical field
The present invention relates to a kind of preparation method and application thereof of water-soluble imidazoline amide corrosion inhibitor, it is anticorrosion to be mainly used in refinery device.
Background technology
Imidazoline corrosion inhibitor is the focus studied in the last few years, and is widely used in the industrial circles such as petrochemical complex, acid pickling and rust removing, oil well acidation, in oil refining petrochemical plant, is mainly used in atmospheric and vacuum distillation unit and can produces HCl or H with other 2the unit of the sour gas such as S or liquid or the anticorrosion of pipeline.Common imidazoline inhibitor is mostly by a part acid (straight-chain acid of C12-C36, mostly be oleic acid, naphthenic acid and dimeracid) dewater with a part or dimolecular polyethylene polyamine and synthesize, or to be dewatered by two molecules acid or naphthenic acid and a part polyethylene polyamine and synthesize, its molecular weight is general all below 1000, such as: CN 101705112A with polyethylene polyamine, Glacial acetic acid and lipid acid for Material synthesis imidazoline amide corrosion inhibitor; US20009/0181867A1 synthesizes bi-imidazoline by dimeracid and two molecule diethylenetriamines; But these common imidazoline corrosion inhibitor mostly easily cause oil-water emulsion, and corrosion inhibition rate will lower than 7019 traditional ricinolic acid amides inhibiter, but traditional 7019 inhibiter easily decompose and easily cause the problems such as oil-water emulsion under strong alkali environment.
Summary of the invention
The object of this invention is to provide a kind of low cost, the preparation method of new type water-solubility imidazoline amide corrosion inhibitor of corrosion inhibition excellence and application, gained inhibiter overcomes traditional inhibiter and easily decomposes under strong alkali environment and easily cause the problems such as oil-water emulsion, have that corrosion inhibition excellence, Heat stability is good, chemical stability are good, low toxicity, free from extraneous odour, to effects such as oil product following process have no side effect.
For solving the problems of the technologies described above, the invention of this reality adopts following technical scheme:
A preparation method for water-soluble imidazoline amide corrosion inhibitor, comprises the following steps that order connects:
A, being dewatered by organic acid and organic polyamine condensation generates organic acid amide;
B, to be dewatered by the organic acid amide condensation of dimeracid and steps A gained, be connected to by organic acid amide on dimeracid, then intramolecular dehydration generates imidazoline amide;
Imidazoline amide and the olefin(e) acid addition reaction of C, step B gained generate water-soluble imidazoline amide corrosion inhibitor, and wherein, the number-average molecular weight of water-soluble imidazoline amide corrosion inhibitor is 1000-3000.
In steps A, the mol ratio of organic acid and organic polyamine is (1:1)-(1:1.2), and temperature of reaction is 130-200 DEG C, and the reaction times is 2-8h.The yield of product, slow-releasing and resistance to emulsifying property can be improved so further.
In step B; the organic acid amide condensation of dimeracid and steps A gained is dewatered and is carried out under nitrogen protection, and wherein, organic acid and dimeracid mol ratio are (1:0.45)-(1:0.55); temperature of reaction is 160-200 DEG C, and the reaction times is 0.5-8h.The yield of product, slow-releasing and resistance to emulsifying property can be improved so further.
In step B, intramolecular dehydration carries out under nitrogen protection, and wherein, dehydration temperaturre is 200-300 DEG C, and dewatering time is 2-8h.The yield of product, slow-releasing and resistance to emulsifying property can be improved so further.
In step C, the mol ratio of organic acid and olefin(e) acid is (1:1)-(1:4), temperature of reaction 80-120 DEG C, reaction 2-8h.The yield of product, slow-releasing and resistance to emulsifying property can be improved so further.
Organic acid is C 8-C 36lipid acid or naphthenic acid; Organic polyamine is diethylenetriamine, triethylene tetramine, tetraethylene pentamine or five ethene hexamines; Dimeracid is dimer (fatty acid) yl; Olefin(e) acid is vinylformic acid, butenoic acid or toxilic acid.When adopting above-mentioned each component collocation preparation, the slow-releasing of product, resistance to emulsifying property, thermostability and chemical stability can be ensured further.
The application of the water-soluble imidazoline amide corrosion inhibitor prepared by the preparation method of above-mentioned water-soluble imidazoline amide corrosion inhibitor, anticorrosion for refinery facilities atmospheric and vacuum distillation unit.The atmospheric and vacuum distillation unit of refinery facilities successively injects this inhibiter, initial 7 days is the membranae praeformativa phase, adding dosage is 8-12ppm (distillating water by tower top to calculate), later by normally adding dosage 2-3ppm (distillating water by tower top to calculate) filling, inhibition efficiency is 95%.
Above-mentioned water-soluble imidazoline amide corrosion inhibitor can be directly used in Atmospheric vacuum tower top or with neutralizing amine interworking for Atmospheric vacuum tower top.
The preferred scheme of the application is: first being dewatered by a part lipid acid or naphthenic acid and the 130-200 DEG C of condensation of a part organic polyamine generates organic acid amide; Then dewatered by a part dimeracid and the 160-200 DEG C of condensation of two molecular organic acids acid amides, be connected to by bimolecular organic acid amide on a part dimeracid, next 200-300 DEG C of high temperature intramolecular dehydration generates imidazoline amide further; Finally, imidazoline amide and olefin(e) acid 80-120 DEG C addition reaction generate water-soluble imidazoline amide, and its molecular weight is generally between 1000-3000.Said synthesis route entirety for the application pioneering, and products obtained therefrom sustained release performance, strong basicity resisting and resistance to emulsifying property compared with inhibiter of the prior art have all had significant lifting.
Below for oleic acid, tetraethylene pentamine and vinylformic acid, explain the reaction scheme of the application further: C 17h 33cOOH+H 2nCH 2cH 2nHCH 2cH 2nHCH 2cH 2nHCH 2cH 2nH 2→
C 17H 33CONH(CH 2CH 2NH) 4H+H 2O
2 C 17H 33CONH(CH 2CH 2NH) 4H+HOOCC 34H 62COOH→C 17H 33CONH(CH 2CH 2NH) 4COC 34H 62CONH(CH 2CH 2NH) 4COC 17H 34+2 H 2O
C 17H 33CONH(CH 2CH 2NH) 4COC 34H 62CONH(CH 2CH 2NH) 4COC 17H 34→
C 17H 33X 1(CH 2CH 2NH) 2CH 2CH 2X 2C 34H 62X 3(CH 2CH 2NH) 2CH 2CH 2X 4C 17H 34
M is between 1-4
N is between 2-8
The NM technology of the present invention is prior art.
The preparation method of water-soluble imidazoline amide corrosion inhibitor of the present invention, prepare simple, with low cost, prepared water-soluble imidazoline amide corrosion inhibitor is compared with inhibiter similar in prior art, corrosion inhibition rate is high, chemical stability and Heat stability is good, particularly there is stability inferior at highly basic good, and can not cause oil-water emulsion, execute-in-place is convenient.
Embodiment
In order to understand the present invention better, illustrate content of the present invention further below in conjunction with embodiment, but content of the present invention is not only confined to the following examples.
Following each embodiment is prepared with reference to following method:
(1) synthesis of organic acid amide:
By being equipped with thermometer, the four-hole boiling flask of water trap is placed in the reaction unit of band heating jacket, add commercial fatty acids or the naphthenic acid of mol ratio 1:1-1.2 successively, and technical grade diethylenetriamine, triethylene tetramine, tetraethylene pentamine or five ethene hexamines, under logical nitrogen protection, be warmed up to 130-200 DEG C of condensation dehydration gradually, reaction 2-8h, until water outlet close to theoretical aquifer yield and no longer water outlet, namely obtains fatty acid amide or cycloalkanoimide;
(2) synthesis of imidazoline amide:
By being equipped with thermometer, the four-hole boiling flask of water trap is placed in the reaction unit of band heating jacket, add organic acid amide and the dimeracid of mol ratio 1:0.45-0.55 successively, under logical nitrogen protection, be warmed up to 160-200 DEG C of condensation dehydration gradually, bimolecular organic acid amide is connected on a part dimeracid, reaction 0.5-8h, until water outlet is close to theoretical aquifer yield and no longer water outlet; Then be warmed up to 200-300 DEG C further, reaction 2-8h, cyclisation generates imidazoline amide;
(3) synthesis of water-soluble imidazoline amide:
In the there-necked flask that thermometer and stirring are housed, add imidazoline amide and olefin(e) acid that mol ratio is 1:2-8 successively, at 80-120 DEG C, reaction 2-8h.
Embodiment 1
By being equipped with thermometer, the four-hole boiling flask of water trap is placed in the reaction unit of band heating jacket, add 1mol (282g) oleic acid and 1mol (189g) tetraethylene pentamine successively, under logical nitrogen protection, be warmed up to 175-185 DEG C of condensation dehydration gradually, reaction 6h, until water outlet close to theoretical aquifer yield 18g and no longer water outlet, namely obtains amine hydroxybenzene; 80% dimeracid that about 0.5mol (350g) Wuxi echo produces is added, 170-180 DEG C of condensation dehydration, reaction 2h, until water outlet is close to theoretical aquifer yield 18g and no longer water outlet in amine hydroxybenzene; Then be warmed up to 265-275 DEG C further, reaction 4h, cyclisation generates imidazoline amide (molecular weight is about 1400).
The there-necked flask that thermometer is housed is placed in the reaction unit of band heating jacket, add the imidazoline amide 145g (about 0.1mol) of above-mentioned synthesis, then be slowly added drop-wise in there-necked flask by 28.8g (0.4mol) vinylformic acid, in dropping process, control temperature is not higher than 100 DEG C; Finally be warmed up between 100-110 DEG C and react 4h, namely obtain water-soluble imidazoline amide A (molecular weight is about 1700).
Embodiment 2
By being equipped with thermometer, the four-hole boiling flask of water trap is placed in the reaction unit of band heating jacket, add about 1mol (127.6g) naphthenic acid (thick acid number >=180mgKOH/g) and 1.08mol (204.5g) tetraethylene pentamine successively, under logical nitrogen protection, be warmed up to 130-140 DEG C of condensation dehydration gradually, reaction 2.5h, until water outlet close to theoretical aquifer yield 18g and no longer water outlet, namely obtains cycloalkanoimide; 85% dimeracid of 0.455mol (300.2g) Wuxi echo is added, 160-170 DEG C of condensation dehydration, reaction 0.5h, until water outlet is close to theoretical aquifer yield 16.3g and no longer water outlet in cycloalkanoimide; Then be warmed up to 200-210 DEG C further, reaction 2h, cyclisation generates imidazoline amide (molecular weight is about 1000).
The there-necked flask that thermometer is housed is placed in the reaction unit of band heating jacket, add the imidazoline amide 104g (about 0.1mol) of above-mentioned synthesis, then 14.4g (0.2mol) vinylformic acid is slowly added drop-wise in there-necked flask, be warmed up between 80-90 DEG C and react 2h, namely obtain water-soluble imidazoline amide B (molecular weight is about 1200).
Embodiment 3
By being equipped with thermometer, the four-hole boiling flask of water trap is placed in the reaction unit of band heating jacket, add about 1mol (256g) palmitinic acid and 1.2mol (227g) tetraethylene pentamine successively, under logical nitrogen protection, be warmed up to 160-170 DEG C of condensation dehydration gradually, reaction 5h, until water outlet close to theoretical aquifer yield 18g and no longer water outlet, namely obtains palmitic amide; 98% dimeracid in sincere source, 0.54mol (309.1g) Jinan is added, 170-180 DEG C of condensation dehydration, reaction 2h, until water outlet is close to theoretical aquifer yield 18g and no longer water outlet in ring palmitic amide; Then be warmed up to 270-280 DEG C further, reaction 5h, cyclisation generates imidazoline amide (molecular weight is about 1400).
The there-necked flask that thermometer is housed is placed in the reaction unit of band heating jacket, add the imidazoline amide 140g (about 0.1mol) of above-mentioned synthesis, then 54g (0.75mol) vinylformic acid is slowly added drop-wise in there-necked flask, be warmed up between 105-115 DEG C and react 5h, namely obtain water-soluble imidazoline amide B (molecular weight is about 1900).
Embodiment 4
By being equipped with thermometer, the four-hole boiling flask of water trap is placed in the reaction unit of band heating jacket, add 1mol (282g) oleic acid and 1mol (146g) triethylene tetramine successively, under logical nitrogen protection, be warmed up to 140-150 DEG C of condensation dehydration gradually, reaction 3h, until water outlet close to theoretical aquifer yield 18g and no longer water outlet, namely obtains amine hydroxybenzene; 0.51mol (357.5g) 80% dimeracid 160-170 DEG C of condensation dehydration is added, reaction 1h, until water outlet is close to theoretical aquifer yield 18g and no longer water outlet in amine hydroxybenzene; Then be warmed up to 220-230 DEG C further, reaction 3h, cyclisation generates imidazoline amide (molecular weight is about 1400).
The there-necked flask that thermometer is housed is placed in the reaction unit of band heating jacket, add the imidazoline amide 138g (about 0.1mol) of above-mentioned synthesis, then be slowly added drop-wise in there-necked flask by 28.8g (0.4mol) vinylformic acid, in dropping process, control temperature is not higher than 100 DEG C; Finally be incubated and react 4h between 85-95 DEG C, namely obtain water-soluble imidazoline amide D (molecular weight is about 1700).
Embodiment 5
By being equipped with thermometer, the four-hole boiling flask of water trap is placed in the reaction unit of band heating jacket, add 1mol (282g) oleic acid and 1mol (232g) five ethene hexamine successively, under logical nitrogen protection, be warmed up to 185-195 DEG C of condensation dehydration gradually, reaction 8h, until water outlet close to theoretical aquifer yield 18g and no longer water outlet, namely obtains amine hydroxybenzene; 0.5mol (350.6g) 80% dimeracid 185-195 DEG C of condensation dehydration is added, reaction 7.5h, until water outlet is close to theoretical aquifer yield 18g and no longer water outlet in amine hydroxybenzene; Then be warmed up to 280-290 DEG C further, reaction 7h, cyclisation generates imidazoline amide (molecular weight is about 1500).
The there-necked flask that thermometer is housed is placed in the reaction unit of band heating jacket, add the imidazoline amide 145g (about 0.1mol) of above-mentioned synthesis, then be slowly added drop-wise in there-necked flask by 34.4g (0.4mol) butenoic acid, in dropping process, control temperature is not higher than 100 DEG C; Finally be warmed up between 110-120 DEG C and react 6h, namely obtain water-soluble imidazoline amide E (molecular weight is about 1800).
Corrosion inhibition is evaluated:
Getting 500ml concentration is the four-hole boiling flask that the hydrochloric acid soln of 1g/L is placed in 1000ml, and takes a certain amount of above-mentioned inhibiter and add in flask, is contained in by the steel disc weighed on glass hook, puts into flask.Keep flask temperature about 100 DEG C, backflow 3h.Take out lacing film ethanol purge, and dry and weigh.Corrosion inhibition rate X=(m 1-m 2) * 100/m 1; m 1for the numerical value of blank test piece weightlessness; m 2for adding the numerical value of inhibiter test piece weightlessness.
7019 traditional water soluble rust inhibitors are denoted as comparison example 1, the imidazoline quaternary ammonium salt synthesized according to CN101705112A embodiment 3 is denoted as comparison example 2, comparison example 3 (bi-imidazoline) is designated as according to the 2-in-1 one-tenth of US20009/0181867A1 embodiment, by the present embodiment and comparison example 1, comparison example 2 and comparison example 3 contrast.Its result is as following table 1
As can be seen from Table 1, the embodiment corrosion inhibition rate of the application is all greater than >90%, apparently higher than comparison example.Show that the inhibiter corrosion inhibition of the application is better than 7019 traditional inhibiter and other conventional water soluble rust inhibitors.
Emulsifying property is evaluated:
Take water as solvent, the water-soluble imidazoline amide that above-described embodiment synthesizes is mixed with the solution that massfraction is 50%, observes its water-soluble outward appearance.Take the solution 1g of massfraction 50%, add in 99g water, being configured to massfraction is 0.5% solution.Take a certain amount of 0.5% amide solution to add in 100ml graduated cylinder, and add 4ml water and 100ml gasoline.Then shake 100 times up and down, leave standstill 15 minutes, observe its oil phase, aqueous phase and interfacial layer.Its result is as following table 2
In table 2, the oil phase of the present embodiment, aqueous phase is all transparent, and interface is without emulsion layer, and emulsifying property is obviously strong than other contrast inhibiter.
For the feature that hydrogen sulfide content in atmospheric and vacuum distillation unit corrosive medium is higher, in and inhibiter to adopt inhibition to be main, neutralization be that auxiliary implement device is anticorrosion.This product except there is corrosion inhibitive function, in also having and rot-resistant double effects.But 7019 traditional inhibiter and other inhibiter easily decompose in alkali, poor stability, with the preparation of inhibiter in cannot realizing, more device can not be applied to anticorrosion.
In and the preparation of inhibiter:
Embodiment 6
By percentage to the quality, following raw material is mixed, stir under normal temperature, the water-soluble imidazoline amide 8% that embodiment 1 is synthesized, 3 methoxypropyl amine 42%, water 50%.
Embodiment 7
By percentage to the quality, following raw material is mixed, stir under normal temperature, the water-soluble imidazoline amide 15% of the 2-in-1 one-tenth of embodiment, 3 methoxypropyl amine 35%, water 50%.
Embodiment 8
By percentage to the quality, following raw material is mixed, stir under normal temperature, the water-soluble imidazoline amide 15% that embodiment 3 is synthesized, 3 methoxypropyl amine 35%, water 50%.
Embodiment 9
By percentage to the quality, following raw material is mixed, stir under normal temperature, the water-soluble imidazoline amide 15% that embodiment 1 is synthesized, 3 methoxypropyl amine 35%, water 50%.
Embodiment 10
By percentage to the quality, following raw material is mixed, stir under normal temperature, the water-soluble imidazoline amide 40% that embodiment 1 is synthesized, 3 methoxypropyl amine 10%, water 50%.
By the inhibiter precentagewise 15% of comparison example 1, comparison example 2 and comparison example 3,3 methoxypropyl amine 35%, during water 50% is made into and inhibiter, i.e. comparison example 11, comparison example 12 and comparison example 13.Evaluate emulsifying property time, by embodiment 6,7,8,9 with comparison example 11,12,13 be made in and inhibiter take 1g, add wiring solution-forming in the water of 99g, in 100ml graduated cylinder, add this solution that 0.2g prepares, and add 4ml water and 100ml gasoline.Then shake 100 times up and down, leave standstill 15 minutes, observe its oil phase, aqueous phase and interfacial layer.Corrosion inhibition rate and emulsifying property are in table 3.
By traditional 7019 inhibiter and comparison example 1 precentagewise 8%, 3 methoxypropyl amine 42%, with inhibiter comparison example 21 during water 50% is made into, precentagewise 15%, 3 methoxypropyl amine 35%, with inhibiter comparison example 22 during water 50% is made into, precentagewise 40%, 3 methoxypropyl amine 10%, with inhibiter comparison example 23 during water 50% is made into.In above-mentioned, be placed on room temperature for storage 30 days with inhibiter, observe its outward appearance.Phenomenon in alkali is in table 4.
The present embodiment and amine mutual solubility are good, stable in properties, and traditional 7019 inhibiter are combined with amine, and character instability, easily decomposes.So the alkali resistance of the present embodiment is better than traditional inhibiter, the purposes on atmospheric and vacuum distillation unit is more extensive.

Claims (10)

1. a preparation method for water-soluble imidazoline amide corrosion inhibitor, is characterized in that: comprise the following steps that order connects:
A, being dewatered by organic acid and organic polyamine condensation generates organic acid amide;
B, to be dewatered by the organic acid amide condensation of dimeracid and steps A gained, be connected to by organic acid amide on dimeracid, then intramolecular dehydration generates imidazoline amide;
Imidazoline amide and the olefin(e) acid addition reaction of C, step B gained generate water-soluble imidazoline amide corrosion inhibitor, and wherein, the number-average molecular weight of water-soluble imidazoline amide corrosion inhibitor is 1000-3000.
2. the preparation method of water-soluble imidazoline amide corrosion inhibitor as claimed in claim 1, it is characterized in that: in steps A, the mol ratio of organic acid and organic polyamine is (1:1)-(1:1.2), and temperature of reaction is 130-200 DEG C, and the reaction times is 2-8h.
3. the preparation method of water-soluble imidazoline amide corrosion inhibitor as claimed in claim 1 or 2; it is characterized in that: in step B; the organic acid amide condensation of dimeracid and steps A gained is dewatered and is carried out under nitrogen protection; wherein; organic acid and dimeracid mol ratio are (1:0.45)-(1:0.55); temperature of reaction is 160-200 DEG C, and the reaction times is 0.5-8h.
4. the preparation method of water-soluble imidazoline amide corrosion inhibitor as claimed in claim 1 or 2, it is characterized in that: in step B, intramolecular dehydration carries out under nitrogen protection, and wherein, dehydration temperaturre is 200-300 DEG C, and dewatering time is 2-8h.
5. the preparation method of water-soluble imidazoline amide corrosion inhibitor as claimed in claim 1 or 2, it is characterized in that: in step C, the mol ratio of organic acid and olefin(e) acid is (1:1)-(1:4), temperature of reaction 80-120 DEG C, reaction 2-8h.
6. the preparation method of water-soluble imidazoline amide corrosion inhibitor as claimed in claim 1 or 2, is characterized in that: organic acid is C 8-C 36lipid acid or naphthenic acid.
7. the preparation method of water-soluble imidazoline amide corrosion inhibitor as claimed in claim 1 or 2, is characterized in that: organic polyamine is diethylenetriamine, triethylene tetramine, tetraethylene pentamine or five ethene hexamines.
8. the preparation method of water-soluble imidazoline amide corrosion inhibitor as claimed in claim 1 or 2, is characterized in that: dimeracid is 80% dimeracid, 85% dimeracid or 98% dimeracid; Olefin(e) acid is vinylformic acid, butenoic acid or toxilic acid.
9. the application of the water-soluble imidazoline amide corrosion inhibitor prepared by the preparation method of the water-soluble imidazoline amide corrosion inhibitor described in claim 1-8 any one, it is characterized in that: on the atmospheric and vacuum distillation unit of refinery facilities, successively inject this inhibiter, initial 7 days is the membranae praeformativa phase, distillate water by tower top to calculate, adding dosage is 8-12ppm; After 7 days, distillate water by tower top and calculate, add dosage 2-3ppm, inhibition efficiency is 95%.
10. apply as claimed in claim 9, it is characterized in that: be directly used in Atmospheric vacuum tower top or with neutralizing amine interworking for Atmospheric vacuum tower top.
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Cited By (5)

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CN105062548A (en) * 2015-08-24 2015-11-18 金浦新材料股份有限公司 Crude oil decalcifying agent
CN106319529A (en) * 2016-08-26 2017-01-11 潍坊天福化学科技有限公司 Preparation method for modified imidazoline corrosion inhibitor
CN107541199A (en) * 2017-09-29 2018-01-05 常州大学 One kind has water soluble polymer corrosion inhibiter of viscosity reduction effect and preparation method thereof concurrently
CN112939869A (en) * 2020-12-28 2021-06-11 山东益丰生化环保股份有限公司 Synthesis method of water-soluble imidazoline
CN116397232A (en) * 2023-04-19 2023-07-07 江苏太湖新材料控股有限公司 Water-soluble corrosion inhibitor and synthesis method thereof

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