CN103820151B - Corrosion inhibitor for hydrogenation unit and preparation method thereof - Google Patents
Corrosion inhibitor for hydrogenation unit and preparation method thereof Download PDFInfo
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- CN103820151B CN103820151B CN201410099268.5A CN201410099268A CN103820151B CN 103820151 B CN103820151 B CN 103820151B CN 201410099268 A CN201410099268 A CN 201410099268A CN 103820151 B CN103820151 B CN 103820151B
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Abstract
The invention discloses a corrosion inhibitor for a hydrogenation unit and a preparation method thereof, belonging to the field of chemical engineering. The preparation method comprises steps of adding absolute ethyl alcohol and isopropanol into a reaction kettle and mixing; then adding a cationic surfactant into the reaction kettle, adding ethylenediamine while stirring, heating up to 60DEG C, keeping warm, then stopping stirring; emptying and suction filtering to obtain the filtrate, which is the corrosion inhibitor for later use; compounding: adding ethylenediamine into water while stirring, then adding the corrosion inhibitor for later use, regulating pH value to be greater than or equal to 8 with cholamine, so as to obtain the target product. The corrosion inhibitor for the hydrogenation unit prepared by the method not only can neutralize an acid medium in a condensing system at the top of a hydrogenation tower in a condensing and cooling system of the hydrogenation unit, but also can form an anti-corrosion membrane on the surface of metal, thus effectively avoiding dew point corrosion of the phase change position of the condensing and cooling system at the top of the tower, prolonging the service life of the hydrogenation unit, and guaranteeing the long-period safe operation of the production device.
Description
Technical field
The invention belongs to chemical field, be specifically related to inhibiter of a kind of hydrogenation unit and preparation method thereof.
Technical background
Along with the demand of change heavily retrogradation and the light-end products of crude oil constantly increases, heavy oil upgrading becomes the subject matter that modern refinery faces, and current heavy oil upgrading mainly contains that delayed coking, sticky cracking are heavy, catalytic cracking and heavy-oil hydrogenation 4 technological process.Hydrogenation technique is a kind of heavy oil deep processing technology, under hydrogen and catalyst action, desulfurization removing nitric demetalization etc. is carried out, to obtain light-end products to greatest extent to normal pressure or vacuum residuum, can optimizing product quality further by combined hydrogenation modifying process, improve product quality.Along with Environmental Protection in China mechanism is day by day perfect, the quality of oil product is had higher requirement, accelerate development residual hydrogenation technology and combinationally use hydro-upgrading technology and seem particularly important
But, in hydrogenation unit, easily form NH
4cl-NH
4hS corrosive environment, forms serious corrosion to hardware.In addition, corrosion product FeS, reaction product elemental sulfur and NH4Cl, NH4HS etc. deposit in the low-temperature zone of air cooler, and deposition is produced into pipe scale and forms serious underdeposit corrosion gradually.Practice at home and abroad experience shows, filling inhibiter is a kind of economy, effectively and the metallic corrosion control method of highly versatile.
Summary of the invention
The object of the invention is the inhibiter that a kind of hydrogenation unit is provided for above-mentioned technical problem, this hydrogenation inhibiter is the composite corrosion inhibitor belonging to film inhibitor and neutralizing amine composition, the feature of this inhibiter is that polymkeric substance inhibition component forms film in interfacial adsorption, and neutralizing amine can neutralize again the H in acidic corrosive media
+, Cl
-, HS
-deng, corrosion inhibition rate significantly improves, and brings up to more than 99% by the corrosion inhibition rate about 90% of original similar inhibiter, is a kind of ideal hydrogenation inhibiter.
A further object of the invention is to provide the preparation method of the inhibiter of this hydrogenation unit.
A kind of inhibiter of hydrogenation unit, the inhibiter of this hydrogenation unit is made up of component A and B component, wherein, component A is made up of dehydrated alcohol, Virahol, promoting agent and alkali lye, and the parts by weight of each component are followed successively by 70 ~ 80 parts, 10 ~ 15 parts, 10 ~ 15 parts and 1 ~ 5 part; B component is made up of water, quadrol and thanomin, and the parts by weight of each component are followed successively by 60 ~ 70 parts, 30 ~ 40 parts and 1 ~ 5 part, and the weight ratio of component A and B component is 1 ~ 10:90 ~ 99.
Preferred component A is made up of dehydrated alcohol, Virahol, promoting agent and alkali lye, and the parts by weight of each component are followed successively by 75 ~ 78 parts, 10 ~ 13 parts, 10 ~ 12 parts and 1 ~ 2.5 part; B component is made up of water, quadrol and thanomin, and the parts by weight of each component are followed successively by 60 ~ 65 parts, 31 ~ 35 parts and 1 ~ 2 part, and wherein, the weight ratio of component A and B component is 2 ~ 5:95 ~ 98.
In technical solution of the present invention component A, promoting agent is cats product 1827, and alkali lye is quadrol.
The inhibiter preparation method of hydrogenation unit described above comprises the following steps:
(1) preparation method of component A: dehydrated alcohol and Virahol are mixed to get mixed solution, under temperature is 30 ~ 60 DEG C of conditions, promoting agent is added in described mixed solution, under the condition stirred, add alkali lye afterwards and be warming up to 50 ~ 70 DEG C, insulation 30 ~ 80min, stop stirring, suction filtration, the filtrate obtained is inhibiter for subsequent use;
(2) composite: under the condition stirred, quadrol to be added to the water and to obtain mixed solution, then add inhibiter for subsequent use in this mixed solution, regulate pH >=8 with thanomin, namely obtain the inhibiter of hydrogenation unit.
The speed stirred in step 1) is 120rpm, and the speed of intensification is 1 DEG C/min.
Step 2) in stir speed be 120rpm, the time is 1 hour.
In step 1) under temperature is 30 ~ 38 DEG C of conditions, in described mixed solution, add promoting agent.
Under the condition stirred, add alkali lye in step 1) and be warming up to 60 DEG C, insulation 30 ~ 80min, suction filtration, the filtrate obtained is inhibiter for subsequent use.
The principle of technical solution of the present invention: the inhibiter of hydrogenation unit of the present invention is by absorption, make the energy state trend of metallic surface stable, form firm film, the transfer of electric charge and the diffusion of etching reagent are all suppressed, thus reduction corrosion of metal, there is the H in neutralizing amine energy and in acidic medium in inhibiter simultaneously
+, Cl
-, HS
-deng, play neutralizing effect, inhibiter, neutralizing agent have synergy, promote that corrosion inhibition rate improves a lot.
Beneficial effect of the present invention
Add cats product 1827 in technical solution of the present invention to mix with other components, there is good anti-corrosion mitigating effect, in addition, the inhibiter of hydrogenation unit prepared by the present invention can prevent the dew point corrosion at phase transformation position effectively at hydrogenation overhead condensation cooling system, thus extend the work-ing life of hydrogenation unit equipment, guarantee the safe operation of production equipment long period.
Embodiment
Below in conjunction with embodiment, the invention will be further described, but protection scope of the present invention is not limited thereto:
Embodiment 1
The preparation of inhibiter: under 3.85kg dehydrated alcohol and 0.5kg Virahol being added in reactor the condition mixing, in temperature be 30 DEG C, 0.55kg cats product 1827 is added in reactor, low whipping speed is add quadrol 0.1kg under the condition of 120rpm and be warming up to 60 DEG C afterwards, insulation 40min, stop stirring, blowing suction filtration, it is for subsequent use that filtrate is inhibiter.Composite: low whipping speed is joined in 61kg water by 32kg quadrol under 120rpm condition, and then adds 5kg inhibiter for subsequent use, then use 2kg thanomin adjust pH to >=8, stir 1h, obtain product of the present invention.
Embodiment 2
The preparation of inhibiter: under 2.25kg dehydrated alcohol and 0.36kg Virahol being added in reactor the condition mixing, in temperature be 35 DEG C, 0.36kg cats product 1827 is added in reactor, low whipping speed is add quadrol 0.03kg under the condition of 120rpm and be warming up to 60 DEG C afterwards, insulation 60min, stop stirring, blowing suction filtration, it is for subsequent use that filtrate is inhibiter.Composite: low whipping speed is joined in 60kg water by 35kg quadrol under 120rpm condition, and then adds 3kg inhibiter for subsequent use, then use 2kg thanomin adjust pH to >=8, stir 1h, obtain product of the present invention.
Embodiment 3
The preparation of inhibiter: under 1.55kg dehydrated alcohol and 0.2kg Virahol being added in reactor the condition mixing, in temperature be 36 DEG C, 0.2kg cats product 1827 is added in reactor, low whipping speed is add quadrol 0.05kg under the condition of 120rpm and be warming up to 60 DEG C afterwards, insulation 50min, stop stirring, blowing suction filtration, it is for subsequent use that filtrate is inhibiter.Composite: low whipping speed is joined in 65kg water by 32kg quadrol under 120rpm condition, and then adds 2kg inhibiter for subsequent use, then use 1kg thanomin adjust pH to >=8, stir 1h, obtain product of the present invention.
Embodiment 4
The preparation of inhibiter: under 2.28kg dehydrated alcohol and 0.36kg Virahol being added in reactor the condition mixing, in temperature be 38 DEG C, 0.3kg cats product 1827 is added in reactor, low whipping speed is add quadrol 0.06kg under the condition of 120rpm and be warming up to 60 DEG C afterwards, insulation 30min, stop stirring, blowing suction filtration, it is for subsequent use that filtrate is inhibiter.Composite: low whipping speed is joined in 64kg water by 31kg quadrol under 120rpm condition, and then adds 3kg inhibiter for subsequent use, then use 2kg thanomin adjust pH to >=8, stir 1h, obtain product of the present invention.
Embodiment 5
The preparation of inhibiter: under 1.875kg dehydrated alcohol and 0.325kg Virahol being added in reactor the condition mixing, in temperature be 32 DEG C, 0.25kg cats product 1827 is added in reactor, low whipping speed is add quadrol 0.05kg under the condition of 120rpm and be warming up to 60 DEG C afterwards, insulation 80min, stop stirring, blowing suction filtration, it is for subsequent use that filtrate is inhibiter.Composite: low whipping speed is joined in 63kg water by 33kg quadrol under 120rpm condition, and then adds 2.5kg inhibiter for subsequent use, then use 1.5kg thanomin adjust pH to >=8, stir 1h, obtain product of the present invention.
Comparative example 1
Adopt the condition identical with embodiment 5, do not add 0.25kg cats product 1827, prepare product of the present invention.
Data Comparison: find contrasting with traditional inhibiter
Contrast finds, the present invention can be cost-saving to a great extent on addition, and can improve the corrosion inhibition rate of hydrogenation unit oil product to pipeline, the working life of extension device.
Claims (7)
1. the inhibiter of a hydrogenation unit, it is characterized in that: the inhibiter of this hydrogenation unit is made up of component A and B component, wherein, component A is made up of dehydrated alcohol, Virahol, promoting agent and alkali lye, and the parts by weight of each component are followed successively by 70 ~ 80 parts, 10 ~ 15 parts, 10 ~ 15 parts and 1 ~ 5 part; B component is made up of water, quadrol and thanomin, the parts by weight of each component are followed successively by 60 ~ 70 parts, 30 ~ 40 parts and 1 ~ 5 part, and the weight ratio of component A and B component is 1 ~ 10:90 ~ 99, wherein, in component A, promoting agent is cats product 1827, and alkali lye is quadrol.
2. the inhibiter of hydrogenation unit according to claim 1, is characterized in that: component A is made up of dehydrated alcohol, Virahol, promoting agent and alkali lye, and the parts by weight of each component are followed successively by 75 ~ 78 parts, 10 ~ 13 parts, 10 ~ 12 parts and 1 ~ 2.5 part; B component is made up of water, quadrol and thanomin, and the parts by weight of each component are followed successively by 60 ~ 65 parts, 31 ~ 35 parts and 1 ~ 2 part, and wherein, the weight ratio of component A and B component is 2 ~ 5:95 ~ 98.
3. an inhibiter preparation method for hydrogenation unit according to claim 1, is characterized in that: described preparation method comprises the following steps:
(1) preparation method of component A: dehydrated alcohol and Virahol are mixed to get mixed solution, under temperature is 30 ~ 60 DEG C of conditions, promoting agent is added in described mixed solution, under the condition stirred, add alkali lye afterwards and be warming up to 50 ~ 70 DEG C, insulation 30 ~ 80min, stop stirring, suction filtration, the filtrate obtained is inhibiter for subsequent use;
(2) composite: under the condition stirred, quadrol to be added to the water and to obtain mixed solution, then add inhibiter for subsequent use in this mixed solution, regulate pH >=8 with thanomin, namely obtain the inhibiter of hydrogenation unit.
4. the inhibiter preparation method of hydrogenation unit according to claim 3, is characterized in that: the speed stirred in step 1) is 120rpm, and the speed of intensification is 1 DEG C/min.
5. the inhibiter preparation method of hydrogenation unit according to claim 3, is characterized in that: step 2) in stir speed be 120rpm, the time of stirring is 1 hour.
6. the inhibiter preparation method of hydrogenation unit according to claim 3, is characterized in that: in step 1) under temperature is 30 ~ 38 DEG C of conditions, in described mixed solution, add promoting agent.
7. the inhibiter preparation method of hydrogenation unit according to claim 3, is characterized in that: under the condition stirred, add alkali lye in step 1) and be warming up to 60 DEG C, and insulation 30 ~ 80min, suction filtration, it is for subsequent use that the filtrate obtained is inhibiter.
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|---|---|---|---|
| CN201410099268.5A CN103820151B (en) | 2014-03-17 | 2014-03-17 | Corrosion inhibitor for hydrogenation unit and preparation method thereof |
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| US5965785A (en) * | 1993-09-28 | 1999-10-12 | Nalco/Exxon Energy Chemicals, L.P. | Amine blend neutralizers for refinery process corrosion |
| CN101280222B (en) * | 2008-06-02 | 2010-08-25 | 中国石油化工集团公司 | Water-soluble corrosion inhibitor, preparation and application thereof |
| CN101705112A (en) * | 2009-11-12 | 2010-05-12 | 沈阳工业大学 | Water-soluble imidazoline amide corrosion inhibitor, preparation method thereof and using method thereof |
| CN102220170B (en) * | 2010-04-13 | 2013-09-11 | 中国石油化工集团公司 | Corrosion inhibitor for hydrogenation unit and preparation method thereof |
| CN102382682B (en) * | 2010-08-25 | 2013-11-20 | 中国石油化工股份有限公司 | Hydrogenation scale and corrosion inhibitor and application of scale and corrosion inhibitor |
| CN102977922A (en) * | 2012-11-28 | 2013-03-20 | 沈阳工业大学 | Preparation method of water-soluble corrosion inhibitor |
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Address after: Weidu village, Dingshu Town, Yixing City, Wuxi City, Jiangsu Province Patentee after: Yixing Baolong New Material Co.,Ltd. Address before: Weidu village, Dingshu Town, Yixing City, Wuxi City, Jiangsu Province Patentee before: YIXING BAOLONG CHEMICAL Co.,Ltd. |
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Effective date of registration: 20220615 Address after: 214000 Zhangdu village, Dapu Town, Yixing City, Wuxi City, Jiangsu Province Patentee after: JIANGSU HANKUANG INDUSTRIAL Co.,Ltd. Address before: Weidu village, Dingshu Town, Yixing City, Wuxi City, Jiangsu Province Patentee before: Yixing Baolong New Material Co.,Ltd. |
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