CN104789968A - Acid liquor corrosion inhibitor for inhibiting hydrochloric acid solution from corroding carbon steel and preparation method - Google Patents
Acid liquor corrosion inhibitor for inhibiting hydrochloric acid solution from corroding carbon steel and preparation method Download PDFInfo
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- CN104789968A CN104789968A CN201510179296.2A CN201510179296A CN104789968A CN 104789968 A CN104789968 A CN 104789968A CN 201510179296 A CN201510179296 A CN 201510179296A CN 104789968 A CN104789968 A CN 104789968A
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Abstract
The invention relates to an acid liquor corrosion inhibitor for inhibiting a hydrochloric acid solution from corroding carbon steel in oil-gas field and chemical enterprises, and a preparation method of the acid liquor corrosion inhibitor, and overcomes the defects that the conventional corrosion inhibitor is large in solvent toxicity, hard to disperse, poor in biodegradability, and the like. The technical scheme is that the chemical name of the corrosion inhibitor is (2-anilino ethyl)-styryl ketone, and called An-Sk for short. The preparation method of the acid liquor corrosion inhibitor comprises the following steps: dissolving 2.25 g paraformaldehyde into 20 ml of concentrated hydrochloric acid-absolute ethyl alcohol solution (with the volume ratio of 1:1), heating, cooling after the paraformaldehyde is dissolved, dropwise adding 4.65 g of aniline into a three-neck flask, after finishing dropwise adding, adjusting the pH value of the solution to be 2-3 through an absolute ethyl alcohol solution, when the solution is cooled to be the room temperature, adding 7.31 g of powdered benzalacetone into the mixed solution, rising the temperature to be 80 DEG C, and reacting for 8 h to obtain the yellowish brown homogeneous phase liquid product, then taking and adding 100-150 ml of ethyl acetate/water solution with the volume ratio of 1:1.5, conducting extraction for two times, taking upper layer organic phase, adding 5 g of anhydrous magnesium sulfate, drying, filtering, and conducting rotary evaporation on the obtained solution at the pressure of -0.1 Mpa and the temperature of 80 DEG C so as to obtain the brown liquid product, namely the acid liquor corrosion inhibitor An-Sk. The acid liquor corrosion inhibitor is simple in preparation method, high in yield, mild in reaction condition, nontoxic and environment-friendly.
Description
Technical field
The present invention relates to a kind of corrosion inhibitors for acidic media for the suppression hydrochloric acid soln corrosion carbon steel in oil field and chemical enterprise and preparation method.
Background technology
In oilfield development process, equipment corrosion is FAQs.According to authoritative department statistics, the equipment loss of 70% is all relevant with corrosion, and after metal is corroded, pattern or mechanical property all can be subject to havoc.And the indirect loss to cause due to metallic corrosion cannot be estimated especially.According to estimates, the financial loss caused because of metallic corrosion, accounts for the 3.5%-4.2% of its gross national product every year at world's majority state.Inhibiter can prevent or slowing down corrosion chemical substance or several chemical mixture a kind of being present in medium with proper concn and form.Inhibiter technology has simple to operate, instant effect, can protect the advantages such as whole system, and to be widely used in be the production processes such as Oil Production processing, chemical bevel, atmospheric environment, process water, instrument manufacture.
Now conventional organic inhibitor comprises Mannich bases, Schiff bases, imidazolines etc.At present, the research of inhibiter is towards the future development of " green corrosion inhibitor-efficiently slowly-releasing efficiency low environment pollute ".Its synthesis of metal inhibitor common in oil field often also exists that toxicity is large, cost is high, weak effect and the dispersed problem such as bad, makes the research and development of novel metal inhibiter become the hot issue of metal material processing industry.The present invention proposes a kind of synthetic method of the new and effective salt acid inhibitor for carbon steel, this inhibitor molecular structure has more heteroatoms (N relative to traditional inhibiter, and double bond O), its lone-pair electron and the π-electron of heterocycle and the d unoccupied orbital of metal form the chemical bond adsorbed more and make it the more closely stable metallic surface that is adsorbed on and hinder contacting of corrosive medium and metallic surface, thus make it to have outstanding corrosion mitigating effect.
Summary of the invention
The object of the invention is: in order to the solvent toxicity overcoming the existence of existing inhibiter is large, the shortcomings such as difficult dispersing and dissolving productive rate is not high.Spy provides a kind of corrosion inhibitors for acidic media and the preparation method that suppress hydrochloric acid soln corrosion carbon steel.
In order to achieve the above object, the present invention is by the following technical solutions: a kind of hydrochloric acid soln that suppresses corrodes carbon steel acid solution inhibiter, and its chemical name is (2-anilino ethyl)-Styryl Ketone, and be abbreviated as As-Nk, its structural formula is:
The preparation method of this corrosion inhibitors for acidic media: first the paraformaldehyde of 2.25g is dissolved in (volume ratio is 1:1) in 20ml concentrated hydrochloric acid-ethanol solution, heating, after band paraformaldehyde dissolves after cooling, aniline 4.65g is dripped in there-necked flask, be added dropwise to complete rear ethanol solution regulator solution pH value to 2-3, band solution is cooled to room temperature, and be warming up to 80 DEG C of reaction 8h add pulverous benzylideneacetone 7.31g in mixing solutions after, product is yellowish brown homogeneous liquid.Then take out and add ethyl acetate/aqueous solution 100-150ml that volume ratio is 1:1.5, extracting twice, get after upper organic phase adds 5g anhydrous magnesium sulfate drying and filter, be-0.1Mpa by gained solution at pressure, temperature is 80 DEG C of rotary evaporations.Obtain brown liquid product benzene corrosion inhibitors for acidic media An-Sk.Its reaction equation is as follows:
Mannich base reacts
Effect of the present invention is: the preparation method of (2-anilino ethyl)-Styryl Ketone inhibiter is simple, productive rate is higher, reaction conditions is gentle, by product is harmless, easy purification, asepsis environment-protecting, good dispersity.
Accompanying drawing explanation
Fig. 1 is the structural formula of inhibiter An-Sk
Fig. 2 is the reaction equation of synthesis inhibiter An-Sk
Embodiment
Below by embodiment, the present invention is further described:
Embodiment 1
First 2.25g paraformaldehyde is dissolved in (volume ratio is 1:1) in 20ml concentrated hydrochloric acid-ethanol solution, heating, after band paraformaldehyde dissolves after cooling, aniline is dripped in there-necked flask, be added dropwise to complete rear ethanol solution regulator solution pH value to 2-3, band solution is cooled to room temperature, and be warming up to 80 DEG C of reaction 8h add pulverous benzylideneacetone in mixing solutions after, product is yellowish brown homogeneous liquid.Then take out and add ethyl acetate/aqueous solution 100-150ml that volume ratio is 1:1.5, extracting twice, get after upper organic phase adds 5g anhydrous magnesium sulfate drying and filter, be-0.1Mpa by gained solution at pressure, temperature is 80 DEG C of rotary evaporations.Obtain brown liquid product benzene corrosion inhibitors for acidic media An-Sk.Adding mol ratio is respectively paraformaldehyde: benzylideneacetone: the benzylideneacetone of aniline=1.5:1:1,1.5:1.3:1,1.5:1.5:1,1.5:1:1.3,1.5:1:1.5 and aniline.Productive rate under different mol ratio is followed successively by 85.9%, and 70.8%, 73.4%, 81.6%, 79.4%.
Embodiment 2
By inhibiter adopt that to survey its temperature in SYT5405-1996 " acidifying inhibiter performance test method and evaluation index " be 60-90 DEG C, massfraction is the corrosion inhibition in the hydrochloric acid of 20%, result shows that this inhibiter is under 0.1%-0.5% concentration, and inhibition efficiency is all more than 90%.Especially, at 60 DEG C, reach primary standard when working concentration is 0.5%, erosion rate is 0.28075g/ (m
2.h).
Claims (2)
1. suppress hydrochloric acid soln to corrode a corrosion inhibitors for acidic media for carbon steel, it is characterized in that: the title of this corrosion inhibitors for acidic media is (2-anilino ethyl)-Styryl Ketone, and be abbreviated as An-Sk, its structural formula is:
2. the preparation method of a corrosion inhibitors for acidic media according to claim 1, it is characterized in that: first the paraformaldehyde of 2.25g is dissolved in (volume ratio is 1:1) in 20ml concentrated hydrochloric acid-ethanol solution, heating, after band paraformaldehyde dissolves after cooling, aniline 4.65g is dripped in there-necked flask, be added dropwise to complete rear ethanol solution regulator solution pH value to 2-3, band solution is cooled to room temperature, be warming up to 80 DEG C of reaction 8h add pulverous benzylideneacetone 7.31g in mixing solutions after, product is yellowish brown homogeneous liquid.Then take out and add ethyl acetate/aqueous solution 100-150ml that volume ratio is 1:1.5, extracting twice, get after upper organic phase adds 5g anhydrous magnesium sulfate drying and filter, be-0.1Mpa by gained solution at pressure, temperature is 80 DEG C of rotary evaporations.Obtain brown liquid product benzene corrosion inhibitors for acidic media An-Sk.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510179296.2A CN104789968A (en) | 2015-04-16 | 2015-04-16 | Acid liquor corrosion inhibitor for inhibiting hydrochloric acid solution from corroding carbon steel and preparation method |
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| CN201510179296.2A CN104789968A (en) | 2015-04-16 | 2015-04-16 | Acid liquor corrosion inhibitor for inhibiting hydrochloric acid solution from corroding carbon steel and preparation method |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060186380A1 (en) * | 2002-03-28 | 2006-08-24 | Baker Hughes Incorporated | Corrosion inhibitor |
| CN103289664A (en) * | 2013-05-09 | 2013-09-11 | 西南石油大学 | Acid liquor corrosion inhibitor for inhibiting corrosion of hydrochloric acid solution on carbon steel and preparation method thereof |
-
2015
- 2015-04-16 CN CN201510179296.2A patent/CN104789968A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060186380A1 (en) * | 2002-03-28 | 2006-08-24 | Baker Hughes Incorporated | Corrosion inhibitor |
| CN103289664A (en) * | 2013-05-09 | 2013-09-11 | 西南石油大学 | Acid liquor corrosion inhibitor for inhibiting corrosion of hydrochloric acid solution on carbon steel and preparation method thereof |
Non-Patent Citations (2)
| Title |
|---|
| 刘俊等: ""一种苄叉丙酮Mannich 碱缓蚀剂的合成及其缓蚀性能"", 《材料保护》 * |
| 孔祥军等: ""胺甲基化反应制备酸化缓蚀剂的研究"", 《石油炼制与化工》 * |
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Application publication date: 20150722 |