CN105088252B - A kind of benzimidazoline corrosion inhibiter being prepared with refined gutter oil - Google Patents
A kind of benzimidazoline corrosion inhibiter being prepared with refined gutter oil Download PDFInfo
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- CN105088252B CN105088252B CN201510509872.5A CN201510509872A CN105088252B CN 105088252 B CN105088252 B CN 105088252B CN 201510509872 A CN201510509872 A CN 201510509872A CN 105088252 B CN105088252 B CN 105088252B
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Abstract
The present invention relates to metal erosion suppression technology field, specifically discloses a kind of benzimidazoline corrosion inhibiter being prepared with refined gutter oil, and its chemical formula is as follows：Wherein, R=C16‑20Saturated alkyl or unsaturated alkyl；R1=H、CH3、C6H5.The corrosion inhibiter is the saturated alkyl and unsaturated alkyl or phenyl that different chain length is introduced in benzimidazole molecule; can be with the pi-electron cloud density of metal-complexing in increasing molecule while; also increase the hydrophobicity of diaphragm; so as to substantially reduce rate of metal corrosion; add metals against corrosion ability; the corrosion inhibiter is oil-soluble products; can be used as oil filed pipeline anti-corrosion and it is industrial acid-washed in corrosion inhibiter; close and firm adsorbed film can be formed on the metal surface; rate of metal corrosion is reduced, reaches the purpose of anti-corrosion of metal.
Description
Technical field
The present invention relates to metal erosion suppression technology field, is prepared more particularly, to one kind with refined gutter oil
Benzimidazoline corrosion inhibiter.
Background technology
In oil gas well mining and industrial heat power equipment acid cleaning process, in order to prevent acid solution to equipment such as oil pipe, sleeve pipe, boilers
Corrosion, in acid solution add corrosion inhibiter be essential anti-corrosion measure, nowadays imidazoline corrosion inhibitor is prevented in oil field pipe
Using particularly extensive in corruption；At present, the synthesis of benzimidazoline is adopted mainly using organic carboxyl acid and substituted o-phenylenediamine as raw material
With ladder-elevating temperature technology, prepared by amidatioon, cyclodehydration.And it is that raw material prepares benzimidazoline to utilize refined gutter oil
The rare report of research of class corrosion inhibiter.
The content of the invention
The technical problems to be solved by the invention are to overcome drawbacks described above present in prior art, there is provided one kind is used refined
The benzimidazoline corrosion inhibiter that gutter oil is prepared.
Second object of the present invention is to provide the preparation method of above-mentioned corrosion inhibiter.
Third object of the present invention is to provide application of the above-mentioned corrosion inhibiter in terms of metal erosion is prevented.
The purpose of the present invention is to be achieved by the following technical programs：
A kind of benzimidazoline corrosion inhibiter being prepared with refined gutter oil, its chemical formula are as follows：
Wherein, R=C16~20Saturated alkyl or unsaturated alkyl；R1 =H、CH3、C6H5。
Good corrosion inhibition is had in acid medium to metal based on benzimidazoline class compound, it is proposed that by fat
The molecule fragment of fat base and benzimidazoline is engaged in a molecule, and the adsorbed film with long chain hydrophobic group more can effective ground resistance
Only corrosive medium is to the close of metal surface, so as to improve the protective capability to metal.
The present invention also provides the preparation method of above-mentioned corrosion inhibiter, is with refined gutter oil and o-phenylenediamine or the adjacent benzene of substitution
Diamines is reaction raw materials, reacts and is made, the refined gutter oil through amidatioon, cyclodehydration（35.3% animal oil, 64.7% are planted
Thing oil）Source be catering industry swill oil.
Corrosion inhibiter favorably is prepared with gutter oil in the prior art, can be in actual conditions, in general gutter oil impurity is a lot,
Raw material can not be directly used as, the slow-release capability of its corrosion inhibiter being prepared is very poor.
When raw material is o-phenylenediamine, above-mentioned preparation method comprises the following steps：
S1. refine gutter oil and press 1 with o-phenylenediamine：1.1~1.5 mass ratio is situated between under inert gas shielding in reaction
In matter, 3~6 h are reacted in 138~145 DEG C；
S2. under 180~200mmHg decompressions, 2~3 h are heated to reflux in 170~180 DEG C, then in 20~25mmHg
It is heated to reflux under decompression, untill no liquid flows out；
S3. cool down, the NaCl aqueous solution is added into mixture, 60~80 DEG C are heated to after mixing and is incubated 1h, cooling,
Stand, separate grease, vacuum drying, produce benzimidazoline corrosion inhibiter.
When raw material is substituted o-phenylenediamine, comprise the following steps：
S1. refine gutter oil and press 1 with substituted o-phenylenediamine：1.3~1.9 mass ratio is under inert gas shielding, anti-
Answer in medium, react 3~6 h in 138~145 DEG C；
S2. under 180~200mmHg decompressions, 2~3 h are heated to reflux in 170~180 DEG C, then in 20~25mmHg
It is heated to reflux under decompression, untill no liquid water flows out；
S3. cool down, the NaCl aqueous solution is added into mixture, 60~70 DEG C are heated to after mixing and is incubated 1h, cooling,
Stand, separate grease, vacuum drying, produce substituted benzimidazole quinoline corrosion inhibiter.
Chemical equation involved in the present invention is：
In formula：C16~20Saturated alkyl or unsaturated alkyl；R1 =H、CH3、C6H5。
It is highly preferred that when raw material is substituted o-phenylenediamine, above-mentioned preparation method concretely comprises the following steps：By refined gutter oil
It is placed in reactor, in mass ratio 1：1.3~1.9 add substituted o-phenylenediamine, under nitrogen protection, in dimethylbenzene medium, in
After 138~145 DEG C are heated to reflux 4~6.5h, under 180~200mmHg decompressions, in 170~180 DEG C, 2~3 are heated to reflux
Hour, then under 20~25mmHg decompressions, 1h is heated to reflux, untill no liquid water flows out, cooling, add into mixture
Enter a certain proportion of 10% NaCl aqueous solution and stir, heating mixture to 60~80 DEG C and is incubated 1h, cooling, stands 2
~more than 3h is allowed to be layered, and lower floor's yellow clear liquid is isolated with separatory funnel, by upper strata grease, is washed with water 2 times, is isolated
Water layer, oil phase vacuum drying, obtains oil-soluble fat-based benzimidazoline corrosion inhibiter.
Present invention also offers application of the above-mentioned benzimidazoline corrosion inhibiter in terms of metal erosion is prevented；Preferably, institute
Metal erosion is stated by acidic aqueous media to be caused.
Compared with prior art, the invention has the advantages that：
It is in benzimidazole point the invention provides a kind of benzimidazoline corrosion inhibiter being prepared with refined gutter oil
, can be with metal-complexing in molecule is increased after saturated alkyl and unsaturated alkyl or phenyl that different chain length is introduced in son
While pi-electron cloud density, also increase the hydrophobicity of diaphragm, so as to substantially reduce rate of metal corrosion, add metal
Resistance to corrosion, the corrosion inhibiter are oil-soluble products, can be used as oil filed pipeline anti-corrosion and it is industrial acid-washed in corrosion inhibiter, can be in gold
Close and firm adsorbed film is formed on metal surface, reduces rate of metal corrosion, reaches the purpose of anti-corrosion of metal.
Embodiment
Present disclosure is further illustrated with reference to specific embodiment, but should not be construed as limiting the invention.
Without departing from the spirit and substance of the case in the present invention, the simple modifications or substitutions made to the inventive method, step or condition,
Belong to the scope of the present invention；Unless otherwise specified, technological means used in embodiment is well known to those skilled in the art
Conventional meanses.
Embodiment 1
In the three-necked flask equipped with water knockout drum, thermometer, condenser pipe and agitating device, the refined gutter oils of addition 20g,
25.0gO-phenylenediamineWith 60ml dimethylbenzene, nitrogen is passed through, is slowly heated to 140 DEG C, 3.5~4.0h is reacted, is gradually heating to
150~160 DEG C, after steaming xylene solvent, remove water knockout drum, be changed to vacuum distillation apparatus, Stress control under 200mmHg,
2~2.5h of stirring reaction at 175~180 DEG C, constantly there are water and superfluous reactant to be distilled out of, then system pressure is gradual again
It is down under 20mmHg, is further continued for 1.0~1.5h of isothermal reaction, untill there is no low-boiling point liquid to steam in course of reaction, production
After thing cooling, the 80ml 10% NaCl aqueous solution is added into mix products and is stirred, heating mixture to 80 DEG C and is protected
Warm 1h, cooling, 2.5h is stood, isolate upper strata grease with separatory funnel, be washed with water 2 times, separate water-yielding stratum, oil phase vacuum
It is dry that light yellow fat-based benzimidazoline cream solid, product weigh 40.8g.Infrared spectrum（KBr）：1634、1547、
1453cm-1(stretching vibration of phenyl ring skeleton); 1572、1456、1410 cm-1（Imidazoline ring skeleton stretching vibration）；3435、
3114 cm-1（Imidazoline ring N-H stretching vibrations）；724 cm-1[-(CH2)n- stretching vibration].
Embodiment 2
In the three-necked flask equipped with water knockout drum, thermometer, condenser pipe and agitating device, the refined gutter oils of addition 30g,
39g N- methyl-o-phenylenediamines and 70ml dimethylbenzene, are passed through nitrogen, after being slowly heated 140 DEG C of back flow reaction 6.5h, 190~
Under 200mmHg, 2.5~3h is evaporated under reduced pressure, then under 20~25mmHg, is evaporated under reduced pressure 1~2h, until the outflow of no liquid is
Only, after cooling, the 110ml 10% NaCl aqueous solution is added into mixture and is stirred, heating mixture to 80 DEG C and is protected
Warm 1h, cooling, 2.0h is stood, isolate upper strata grease with separatory funnel, be washed with water 2 times, separate water layer, oil phase vacuum is done
It is dry, obtain the corrosion inhibiter of paste oil-soluble fat-based N- tolimidazole quinolines, weight 48.3g.Infrared spectrum（KBr）：1636、
1550、1450cm-1(stretching vibration of phenyl ring skeleton); 1575、1455、1410 cm-1（Imidazoline ring skeleton stretching vibration）；
2868、2890 cm-1（CH3,CH2Stretching vibration.720 cm-1[-(CH2)n- stretching vibration].
Embodiment 3
In the three-necked flask equipped with water knockout drum, thermometer, condenser pipe and agitating device, the refined gutter oils of addition 30g,
43.5g N- phenyl o-phenylenediamines and 80ml dimethylbenzene, are passed through nitrogen, after being slowly heated 140 DEG C of back flow reaction 6.5h, 190~
Under 200mmHg, 2.5~3h is evaporated under reduced pressure, then under 20~25mmHg, is evaporated under reduced pressure 1~2h, until the outflow of no liquid is
Only, after cooling, the 120ml 10%NaCl aqueous solution is added into mixture and is stirred, heating mixture to 80 DEG C and is incubated
1h, cooling, 1.5h is stood, isolate upper strata grease with separatory funnel, be washed with water 2 times, separate water-yielding stratum, oil phase vacuum is done
It is dry, obtain oil-soluble fat-based N- phenylbenzimidazol quinoline cream solid corrosion inhibiter, weight 49.8g.Infrared spectrum（KBr）：1635、
1545、1451cm-1(stretching vibration of phenyl ring skeleton); 1568、1445、1410 cm-1。2875、2891 cm-1（CH3,CH2It is flexible
Vibration）；722 cm-1[-(CH2)n- stretching vibration].
The fat-based benzimidazoline corrosion inhibiter of gained of the invention can form good adsorbed film in metal surface, be advantageous to
Corrosion of metal protects.The corrosion inhibition test that oil field pipe anti-corrosion is carried out simply is considered below.Because oil field pipe is mainly N80 steel
Material, therefore using N80 metal materials come simulated experiment, examine the performance of corrosion inhibiter.The example of this invention is only one in experiment,
All experiments are not represented, it is only for reference.
Fat-based N- phenylbenzimidazol quinolines made from the fat-based benzimidazoline made from embodiment 1 and embodiment 3
It is standby for 35% ethanol solution that corrosion inhibiter is made into mass percent respectively.
The H containing 400mg/L prepared toward 1000ml2S and 10% NaCl solution（Medium 1）With 1000ppm HCl+
100ppmH2S（Medium 2）In be separately added into fat-based made from fat-based benzimidazoline made from embodiment 1 and embodiment 3
N- phenylbenzimidazol quinoline corrosion inhibiter 0.6ml, by the suspension of N80 steel discs in the solution, 60 DEG C of water bath with thermostatic control, after placing 72h, measurement
Steel disc quality, experimental result such as table 1.
Comparative example 1
Experimental method with embodiment 3, it is unique unlike select is not refined gutter oil, but general gutter oil, institute
The identical method of corrosion inhibiter Application Example 3 being prepared carries out oil field pipe corrosion inhibition test, the results showed that：By N80 steel discs
In the solution, 60 DEG C of water bath with thermostatic control, after placing 72h, its corrosion inhibition rate is 82.5% for suspension.
Claims (4)
- A kind of 1. method for preparing benzimidazoline corrosion inhibiter with refined gutter oil, it is characterised in that with refined gutter oil and neighbour Phenylenediamine or substituted o-phenylenediamine are reaction raw materials, react and are made through amidatioon, cyclodehydration；When raw material is o-phenylenediamine When, comprise the following steps：S1. refine gutter oil and press 1 with o-phenylenediamine：1.1~1.5 mass ratio is under inert gas shielding, in reaction medium, 3~6 h are reacted in 138~145 DEG C；S2. under 180~200mmHg decompressions, 2~3 h are heated to reflux in 170~180 DEG C, then under 20~25mmHg decompressions It is heated to reflux, untill no liquid water flows out, produces benzimidazoline corrosion inhibiter；Or when raw material is substituted o-phenylenediamine, comprise the following steps：S1. refine gutter oil and press 1 with substituted o-phenylenediamine：1.3~1.9 mass ratio is situated between under inert gas shielding in reaction In matter, 3~6 h are reacted in 138~145 DEG C；S2. under 180~200mmHg decompressions, 2~3 h are heated to reflux in 170~180 DEG C, then under 20~25mmHg decompressions It is heated to reflux, untill no liquid water flows out；S3. cool down, the NaCl aqueous solution is added into mixture, 60~70 DEG C are heated to after mixing and is incubated 1h, cool down, stand, Grease, vacuum drying are separated, produces substituted benzimidazole quinoline corrosion inhibiter；The chemical formula of the benzimidazoline corrosion inhibiter is as follows：?1Wherein, R=C16-20Saturated alkyl or unsaturated alkyl；R1 =H、CH3、C6H5。
- 2. the benzimidazoline corrosion inhibiter that claim 1 methods described is prepared.
- 3. application of the benzimidazoline corrosion inhibiter in terms of metal erosion is prevented described in claim 2.
- 4. application according to claim 3, it is characterised in that the metal erosion is caused by acidic aqueous media.
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| CN105820156A (en) * | 2016-04-21 | 2016-08-03 | 广东工业大学 | Benzotriazole benzimidazoline as well as preparation method and application thereof |
| CN106083727B (en) * | 2016-06-06 | 2019-04-19 | 广东工业大学 | A kind of mixing-in fat base bis- (benzimidazole hyamines) and the preparation method and application thereof |
| CN108383797B (en) * | 2018-03-09 | 2020-07-21 | 浙江农林大学 | Anticorrosive compound and preparation method and application thereof |
| CN110760858A (en) * | 2019-10-15 | 2020-02-07 | 桂林理工大学 | Schiff base waste cooking oil derivative corrosion inhibitor and preparation method and application thereof |
| CN110818640B (en) * | 2019-11-19 | 2022-12-09 | 西安石油大学 | Corrosion inhibition lubricant for alcohol-based clean fuel oil and preparation method thereof |
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| CN101260523A (en) * | 2008-04-25 | 2008-09-10 | 成都能之杰科技有限公司 | Petroleum natural gas pipeline corrosion inhibitor prepared by waste grease and method thereof |
| CN103012272A (en) * | 2012-12-21 | 2013-04-03 | 张家港保税区超威电化技术服务有限公司 | Preparation method of imidazoline compound |
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| CN101260523A (en) * | 2008-04-25 | 2008-09-10 | 成都能之杰科技有限公司 | Petroleum natural gas pipeline corrosion inhibitor prepared by waste grease and method thereof |
| CN103012272A (en) * | 2012-12-21 | 2013-04-03 | 张家港保税区超威电化技术服务有限公司 | Preparation method of imidazoline compound |
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