CN101613622A - A kind of composite inhibiter and its production and use - Google Patents
A kind of composite inhibiter and its production and use Download PDFInfo
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- CN101613622A CN101613622A CN200910065567A CN200910065567A CN101613622A CN 101613622 A CN101613622 A CN 101613622A CN 200910065567 A CN200910065567 A CN 200910065567A CN 200910065567 A CN200910065567 A CN 200910065567A CN 101613622 A CN101613622 A CN 101613622A
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Abstract
The invention discloses a kind of composite inhibiter and its production and use.This composite inhibiter is a composition, and it is formed and content is: (A) bi-imidazoline quaternary ammonium salt 10 weight %～60 weight %; (B) pyridine derivate 1 weight %～10 weight %; (C) inhibition auxiliary agent 1 weight %～30 weight %; (D) solvent 10 weight %～50 weight %.This inhibiter has good result to preventing refinery low temperature lightweight oil position equipment corrosion.
Description
Technical field
The invention belongs to the refining of petroleum field, relate to a kind of composite inhibiter that prevents equipment corrosion and its production and use.
Background technology
Deep development along with crude oil, the crude oil with poor quality proportion is increasing, cause the etching problem of oil refinery equipment serious day by day, wherein once, the corrosion of secondary processing device low temperature light oil position equipment is particularly outstanding, as atmospheric and vacuum distillation unit overhead condensation cooling system, catalytic cracking stable absorption system and delayed coker fractionator top condensation cooling system.The corrosion of atmospheric and vacuum distillation unit overhead condensation cooling system mainly is H
2S-HCl-H
2The corrosion of O type, the corrosion of catalytic cracking stable absorption system mainly is HCN-H
2S-H
2The corrosion of O type, the corrosion of delayed coker fractionator condensation cooling system mainly is H
2S-HCl-NH
3-H
2The corrosion of O type.
A lot of about low temperature light oil position rot-resistant inhibiter patent both at home and abroad at present, these inhibiter mainly are divided into oil soluble and water-soluble two classes, and its corrosion inhibition and range of application are each has something to recommend him.A kind of inhibiter of mainly being made up of PAPE, sulfonate, zinc salt, polyethylene polyamine and solubility promoter is disclosed as CN1111683A, CN1422984A discloses a kind of metal inhibitor by band aromatic nucleus, straight chain imidazoline amide, thiocarbamide, alkynol and solvent composition, and above-mentioned inhibiter is at H in the atmospheric and vacuum distillation unit tower top condensing system
2S-HCl-H
2O type corrosion system.CN1546730A discloses a kind of catalytic cracking unit stable absorption HCN-H of system that is applied to
2S-H
2Water-soluble corrosion inhibitor of O type corrosive and preparation method thereof.CN1584121A discloses a kind of H of being applied to
2S-H
2Inhibitor of O corrosion system and preparation method thereof.The disclosed inhibiter of forming with organic acid acetic, sulfonated petro-leum and heavy aromatics nitrogenous compound is mainly used in the inhibiter of oil hydrogenation, reformer among CN1580326A and the CN1754944A.The certain deficiency of above-mentioned inhibiter ubiquity, as the disclosed inhibiter of CN1111683A in pH=6～7 scopes better, the corrosion mitigating effect under strong acid or alkaline environment reduces and loses provide protection; The dispersing property in the aqueous solution of CN1422984A and the disclosed inhibiter of CN1580326A is poor; The inhibiter majority of above-mentioned patent disclosure only is applicable to a certain corrosion system in addition.
Summary of the invention
The objective of the invention is that above-mentioned inhibiter pH use range is narrow, range of application is single in order to overcome, in the aqueous solution shortcoming such as dispersing property difference, a kind of new type compound inhibiter is provided.
Another object of the present invention provides the preparation method and the purposes of composite inhibiter of the present invention.
The invention provides a kind of composite inhibiter, its composition and content are as follows:
(A) the bi-imidazoline quaternary ammonium salt 10%～60%
(B) pyridine derivate 1%～10%
(C) the inhibition auxiliary agent 1%～30%
(D) solvent 10%～50%
Described content is weight percentage, in the inhibiter gross weight.
Wherein, the general structure of described bi-imidazoline quaternary ammonium salt is as the formula (1):
In the formula, R is-CH
2C
6H
5Or-CH
2COONa;
The content of described bi-imidazoline quaternary ammonium salt is preferably 25 weight % ~ 55 weight %.
Described pyridine derivate is any one in the pyridines tensio-active agent, in inhibiter, mainly play promote inhibiter in water dispersing property and in the metallic surface film forming stability, any one in preferred bromohexadecane yl pyridines and the chloro-hexadecane yl pyridines.
Described inhibition auxiliary agent is to have synergistic material with the bi-imidazoline quaternary ammonium salt, improves the corrosion inhibition of inhibiter.The inhibition auxiliary agent can be any one or more than one mixture in Sodium orthomolybdate, zinc sulfate, zinc acetate, potassiumiodide, thiocarbamide, propiolic alcohol and the 2 mercapto ethanol, any one or both mixtures in preferred Sodium orthomolybdate, thiocarbamide and the propyl alcohol alcohol.The content of described inhibition auxiliary agent is preferably 5 weight % ~ 20 weight %.
Described solvent is any one or more than one mixture in water, methyl alcohol, ethanol, Virahol and C4～C10 alkyl alcohol, any one or two kinds in preferably water and the ethanol Virahol.The content of described solvent is preferably 25 weight % ~ 45 weight %.
The present invention also provides a kind of preparation method of composite inhibiter of the present invention, it is characterized in that:
(a) preparation of bi-imidazoline quaternary ammonium salt:
With hexanodioic acid and diethylenetriamine according to 1: 1.5 ~ 1: 5, be preferably 1: 2 ~ 1: 2.5 mixed in molar ratio, and adding accounts for hexanodioic acid and diethylenetriamine gross weight 0.05 weight %～2 weight %, be preferably the catalyzer of 0.1 weight %～0.5 weight %, thorough mixing is warming up to 120 ℃～250 ℃ after stirring, and is preferably 140 ℃～250 ℃, reacts 2～12 hours, be preferably 4～8 hours, obtain the bi-imidazoline intermediate; Be cooled to below 60 ℃ the back according to mol ratio 1: 1～1: 6, being preferably 1: 2～1: 3 mol ratio slowly adds quaternizing agent, add the back that finishes at 80 ℃～120 ℃, be preferably under 90 ℃～110 ℃ the temperature, reacted 1～8 hour, be preferably 2～5 hours, obtain the bi-imidazoline quaternary ammonium salt shown in structural formula (1) after the cooling.
(b) preparation of composite inhibiter:
Bi-imidazoline quaternary ammonium salt and pyridine derivate, inhibition auxiliary agent and the solvent of step (a) preparation are carried out the composite composite inhibiter of the present invention that promptly gets.
Wherein, described catalyzer is Al
2O
3, H
3PO
4, NaBH
4, H
3BO
3, Me
3In Al and the Tetrabutyl amonium bromide any one is preferably NaBH
4And H
3BO
3In any one.
Described quaternizing agent is Benzyl Chloride or hypochlorous acid and clorox mixture.
The present invention also provides a kind of using method of composite inhibiter of the present invention, in temperature is 0 ℃～120 ℃ generation corrosive lightweight oil medium fluid, take former dose of injection or inject composite inhibiter of the present invention with water blended mode, the content that makes inhibiter in the fluid is 5～50mg/L.
Composite inhibiter provided by the present invention all has good corrosion inhibition at strongly-acid (pH=1.0) environment in the scope of weakly alkaline (pH=10) environment, both had the film forming properties good, had again in water good solubility and dispersiveness in the metallic surface.This composite inhibiter can be used for the protection against corrosion of low temperature lightweight oil position, refining of petroleum field equipment, as the corrosion protection of equipment in atmospheric and vacuum distillation unit overhead condensation cooling system, catalytic cracking unit stable absorption system and the delayed coker fractionator condensation cooling system etc., can effectively control H
2S-HCl-H
2O type, HCN-H
2S-H
2O type or H
2S-HCl-NH
3-H
2O type corrosive environment uses this composite inhibiter of 5～50mg/L just can make corrosion inhibition rate more than 95% to the corrosion of carbon steel equipment.
Embodiment
Below in conjunction with specific embodiment the present invention is described in further detail, but these embodiment do not limit the scope of the invention.
Evaluation method
(1) appreciation condition: according to the situation at refinery low temperature light oil position, laboratory preparation etchant solution is simulated actual corrosive environment and is carried out the corrosion coupon experiment.Select for use the carbon steel test piece to carry out corrosion experiment, adopt blank and add inhibiter to compare,, calculate corrosion inhibition rate according to the corrosion weight loss and the corrosion condition of test piece.The organic amine neutralizing agent is selected in the adjustment of pH value for use.
(2) evaluation procedure:
1. according to different low temperature light oil position situation preparation simulation etchant solution;
2. carbon steel test piece pre-treatment is weighed;
3. carry out corrosion experiment (at the inhibiter evaluation experimental, test piece is pre-membranization 2 hours in the etchant solution of corresponding inhibiter of 50mg/L at content at first);
4. take out test piece, weigh after treatment, calculate corrosion inhibition rate.
Wherein embodiment 1～embodiment 4 is the synthetic and preparation of inhibiter, and embodiment 5,6 and 7 is the corrosion inhibition evaluation of inhibiter.
Embodiment 1～3 is the preparation example of bi-imidazoline quaternary ammonium salt:
Embodiment 1
Hexanodioic acid and diethylenetriamine are dropped into reactor according to 1: 2.2 mol ratio, add the boric acid that accounts for charging capacity 0.2 weight %, progressively be warming up to 230 ℃ under constantly stirring, the temperature reaction time is 4 hours, obtains the bi-imidazoline intermediate; Be cooled to back below 60 ℃ and slowly add Benzyl Chloride reagent at 1: 2 according to mol ratio, adding finishes the back under 90～110 ℃ temperature, reacts 3 hours, obtains bi-imidazoline quaternary ammonium salt A1 after the cooling.
Embodiment 2
According to the similar method of preparation bi-imidazoline quaternary ammonium salt A1 among the embodiment 1, replace Benzyl Chloride reagent by 1: 2 hypochlorous acid of mol ratio and clorox mixture, bi-imidazoline intermediate and quaternizing agent mol ratio are 1: 3, make bi-imidazoline quaternary ammonium salt A2.
Embodiment 3
According to the similar method of preparation bi-imidazoline quaternary ammonium salt A1 among the embodiment 1, wherein raw material hexanodioic acid and diethylenetriamine mol ratio are 1: 3, make bi-imidazoline quaternary ammonium salt A3.
The preparation example of embodiment 4 composite inhibiters
Mix seven kinds of different composite inhibiters such as making HS01～HS07 with pyridine derivate, inhibition auxiliary agent and solvent according to the certainweight ratio according to making bi-imidazoline quaternary ammonium salt A1, A2 among the embodiment 1～3 respectively with A3, as shown in table 1.
The composition of table 1 different composite type inhibiter
Embodiment 5～7 is the inhibiter evaluation Example:
Embodiment 5
According to the environment of ordinary decompression column top condensation cooling system, the preparation corrosive medium is 1000mg/LHCl+1000mg/L NaCl+200mg/L H
2The S aqueous solution is selected organic amine neutralizing agent regulator solution pH value for use, investigates the corrosion inhibition of different composite type inhibiter.Experimental result sees Table 2.
Table 2 different composite type inhibiter laboratory evaluation data
As can be seen from Table 2, at H
2S-HCl-H
2O type corrosive environment, behind the inhibiter of interpolation 20mg/L, the corrodibility of corrosion system significantly reduces, and the corrosion inhibition rate of 6 kinds of inhibiter is all more than 96%.In addition, the corrosion mitigating effect of inhibiter increases along with the rising of pH value in the corrosion system, and under pH＞5.1 conditions, the corrosion inhibition rate of inhibiter all reaches 98%.
Embodiment 6
According to the environment at catalytic cracking unit stable absorption system hypothermia light oil position, the preparation corrosive medium is 120mg/L HCN+200mg/L H
2The S aqueous solution, the corrosion inhibition of investigation different composite type inhibiter.Experimental result sees Table 3.
Table 3 different composite type inhibiter laboratory evaluation data
As shown in Table 3, at HCN-H
2S-H2O type corrosive environment, behind the interpolation 20mg/L inhibiter, the corrosive nature of corrosion system significantly reduces, and the corrosion inhibition rate of 6 kinds of inhibiter all surpasses 96%, and wherein the corrosion inhibition rate of inhibiter HS02, HS04 and HS05 is more than 98.2%.Inhibiter HS02, HS04 and HS05 are when the concentration of 10mg/L in addition, and its corrosion inhibition rate is all more than 96%.
Embodiment 7
The neutralizing agent of refinery distillation tower injection at present mostly is ammoniacal liquor, and therefore preparing corrosive medium is 1000mg/LHCl+1000mg/L NH
3+ 200mg/L H
2The S aqueous solution, the corrosion inhibition of investigation different composite type inhibiter.Experimental result sees Table 4.
Table 4 different composite type inhibiter laboratory evaluation data
As shown in Table 4, at HCl-NH
3-H
2S-H
2O type corrosive environment, behind the interpolation 20mg/L inhibiter, the corrosive nature of corrosion system significantly reduces, and the corrosion inhibition rate of 6 kinds of inhibiter all surpasses 96%.
Although the present invention has been done detailed explanation and has quoted some specific exampless as proof, to those skilled in the art, only otherwise leaving the spirit and scope of the present invention can be obvious as various changes and modifications.
Claims (9)
1. composite inhibiter is characterized in that being made up of following component and content:
(A) the bi-imidazoline quaternary ammonium salt 10%～60%, its general structure as the formula (1):
In the formula, R is-CH
2C
6H
5Or-CH
2COONa;
(B) pyridine derivate 1%～10%, and it is in the pyridines tensio-active agent any one;
(C) the inhibition auxiliary agent 1%～30%, its be in Sodium orthomolybdate, zinc sulfate, zinc acetate, potassiumiodide, thiocarbamide, propiolic alcohol and the 2 mercapto ethanol any one or more than one;
(D) solvent 10%～50%, and it is water, methyl alcohol, ethanol, Virahol and C
4～C
10In the alkyl alcohol any one or more than one;
Described each components contents accounts for the weight percentage of inhibiter gross weight for each composition weight.
2. composite inhibiter according to claim 1, it is characterized in that: the content of described bi-imidazoline quaternary ammonium salt (A) is 25%～55%, the content of inhibition auxiliary agent (C) is 5%～20%, and the content of solvent (D) is 25%～45%, and described content is weight percentage.
3. composite inhibiter according to claim 1 and 2 is characterized in that: described pyridine derivate (B) is any one in bromohexadecane yl pyridines and the chloro-hexadecane yl pyridines.
4. composite inhibiter according to claim 1 and 2 is characterized in that: described inhibition auxiliary agent (C) is any one or two kinds mixture wherein in Sodium orthomolybdate, thiocarbamide and the propiolic alcohol.
5. composite inhibiter according to claim 1 and 2 is characterized in that: described solvent (D) is any one or two kinds mixture wherein in water, ethanol and the Virahol.
6. the preparation method of the described composite inhibiter of claim 1 is characterized in that:
(a). with hexanodioic acid and diethylenetriamine mixed in molar ratio according to 1: 1.5～1: 5, and adding accounts for the catalyzer of hexanodioic acid and diethylenetriamine gross weight 0.05 weight %～2 weight %, thorough mixing is warming up to 120 ℃～250 ℃ after stirring, reacted 2～12 hours, and obtained the bi-imidazoline intermediate; Slowly add quaternizing agent according to 1: 1～1: 6 add-on of mol ratio after being cooled to below 60 ℃, adding finishes the back under 80～120 ℃ temperature, reacts 1～8 hour, obtains the bi-imidazoline quaternary ammonium salt shown in structural formula (1) after the cooling; Wherein catalyzer is Al
2O
3, H
3PO
4, NaBH
4, H
3BO
3, Me
3In Al and the Tetrabutyl amonium bromide any one, quaternizing agent are Benzyl Chloride or hypochlorous acid and clorox mixture;
(b). bi-imidazoline quaternary ammonium salt and pyridine derivate, inhibition auxiliary agent and the solvent of step (a) preparation are carried out the composite composite inhibiter that promptly gets.
7. the preparation method of composite inhibiter according to claim 6, it is characterized in that: described hexanodioic acid and diethylenetriamine were according to 1: 2～1: 2.5 mixed in molar ratio, and adding accounts for the catalyzer of hexanodioic acid and diethylenetriamine gross weight 0.1 weight %～0.5 weight %, thorough mixing is warming up to 140 ℃～250 ℃ after stirring, reacted 4～8 hours, and obtained the bi-imidazoline intermediate; Mol ratio according to 1: 2～1: 3 after being cooled to below 60 ℃ slowly adds quaternizing agent, adds to finish the back under 90～110 ℃ temperature, reacts 2～5 hours, obtains the bi-imidazoline quaternary ammonium salt shown in structural formula (1) after the cooling.
8. according to the preparation method of claim 6 or 7 described composite inhibiters, it is characterized in that: described catalyzer is NaBH
4Or H
3BO
3
9. the using method of the described composite inhibiter of claim 1, it is characterized in that in temperature is 0 ℃～120 ℃ generation corrosive lightweight oil medium fluid, take former dose of injection or inject composite inhibiter of the present invention with water blended mode, the content that makes inhibiter in the fluid is 5～50mg/L.
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