CN105220159B - A kind of corrosion inhibiter suitable for iron-based doctor solution - Google Patents
A kind of corrosion inhibiter suitable for iron-based doctor solution Download PDFInfo
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- CN105220159B CN105220159B CN201510633354.4A CN201510633354A CN105220159B CN 105220159 B CN105220159 B CN 105220159B CN 201510633354 A CN201510633354 A CN 201510633354A CN 105220159 B CN105220159 B CN 105220159B
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- corrosion inhibiter
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Abstract
The invention discloses a kind of corrosion inhibiter suitable for iron-based doctor solution, it is made up of following component：The main corrosion inhibiter of stable complexation iron, stable complexation iron help corrosion inhibiter, antibacterial type corrosion inhibiter, stable potential corrosion inhibiter.Corrosion inhibiter of the present invention can effectively alleviate corrosion of the iron-based doctor solution to equipment, corrosion inhibiter of the present invention is added in iron-based doctor solution technique, the oxidation film of more stable iron can be formed in equipment surface, reduce corrosion current, increase polarization resistance, slow down the degree of spot corrosion by the oxide-film on thickening device surface, the sulfide of doctor solution generation is not easy to form spot corrosion in this site deposition, prevents Fe3+Directly directly contacted with equipment surface, can effectively reduce corrosion of the Complexing Iron doctor solution to device interior.
Description
Technical field
The invention belongs to gas purification technique field, and in particular to a kind of corrosion inhibiter and its use for iron-based doctor solution
Method.
Background technology
1) the LO-CAT Complexing Iron desulfurization technology of U.S.'s air cleaning service, the Shell Oil Company of the U.S. and DOW Chemical are public
The Sulferox Complexing Iron sulfur removal technologies of joint development are taken charge of, chelating agent has extremely strong affinity to iron in both technologies, can be fast
The materials such as instant solution carbon steel, aluminium, copper, therefore absorption/oxidator shell and internals, solution connecting pipe, valve etc. are adopted
With stainless steel, using ABS material etc., these techniques have chemical agent add-on system to equipment, tubing etc. in sweetening process
Particular/special requirement, process costs are higher.
2) CN85100471 describes an eka-tungsten system water quality corrosion inhibiter, its main component contain sodium tungstate, sodium gluconate,
Sodium Polyacrylate, positive lauroylsarcosine sodium, it can effectively prevent the doctor solution that CN1081930 is invented to equipment material
Corrosion.Up to more than 90%, slow release effect need to be improved further its corrosion inhibition rate.
3) CN99100396.1 describes a kind of iron-alkali solution catalyzing gas decarbonization, desulfurization, denitrogenation technology.Containing compared with
High concentration solubility ferrous ion and soluble ferric ion are oxidized to ferrous ion or trivalent to reduce monovalent iron
The reaction speed of iron ion, mitigate corrosivity of the solution to equipment.But the reagent does not possess bactericidal effect.
4) CN1422686A describes a kind of corrosion inhibiter for the complexing ferrous solution that sulfide is removed from admixture of gas.Should
Corrosion inhibiter is antimonic salt composite corrosion inhibitor, can efficiently reduce corrosion of the complexing ferrous solution to carbon steel, and corrosion rate can reduce by 10 times
More than.But the reagent does not possess bactericidal effect.
Some have higher requirement to equipment material to the above method, and some corrosion inhibitor effects need raising badly,
Some corrosion inhibiter do not possess sterilizing function.
The content of the invention
The present invention provides a kind of composite multi-functional corrosion inhibiter for Complexing Iron sulfur removal technology, it is therefore intended that alleviates equipment
Extent of corrosion, the loss of reduction doctor solution, enhancing chelating iron stability and current potential are applied to iron-based doctor solution.
A kind of corrosion inhibiter suitable for iron-based doctor solution provided by the invention, is made up of following component：Stable complexation iron master
Corrosion inhibiter, stable complexation iron help corrosion inhibiter, antibacterial type corrosion inhibiter, stable potential corrosion inhibiter；
The main corrosion inhibiter of stable complexation iron is mixing more than one or both of alkali metal sulfates, tungstates
Thing, content are 27%~57%；
The stable complexation iron helps corrosion inhibiter as mixing more than one or both of alkali metal benzoate, silicate
Thing, content are 3%~15%；
The antibacterial type corrosion inhibiter is mixture more than one or both of KBr, KI, formaldehyde, and content is
18%~66%；
The stable potential corrosion inhibiter is one or both of dodecyl sodium sulfate, paratoluenesulfonic acid sodium salt, and content is
3%~11%.
During use, the concentration of the corrosion inhibiter is 0.05~5g/L, i.e. is needed to use in every liter of iron-based doctor solution
0.05~25g corrosion inhibiter.The content of each component is respectively：
The concentration of alkali metal sulfates is 0~10g/L in main corrosion inhibiter；
The concentration of alkali tungstates is 0~0.5g/L in main corrosion inhibiter；
The concentration for helping alkali metal benzoate in corrosion inhibiter is 0~2g/L；
The concentration for helping alkali silicate in corrosion inhibiter is 0~2g/L；
The concentration of KBr is 0~5g/L in antibacterial type corrosion inhibiter；
The concentration of KI is 0~5g/L in antibacterial type corrosion inhibiter；
The concentration of formaldehyde is 0~10g/L in antibacterial type corrosion inhibiter；
The concentration of dodecane sulfonate is 0~2g/L in stable potential corrosion inhibiter；
The concentration of tosilate is 0~5g/L in stable potential corrosion inhibiter.
Corrosion inhibiter provided by the invention suitable for iron-based doctor solution, it can effectively alleviate corruption of the iron-based doctor solution to equipment
Erosion, wherein, main corrosion inhibiter, help the compound system that corrosion inhibiter forms to slow down spot corrosion for thickening oxide-film；Antibacterial type corrosion inhibiter is used
In prevent because in desulfuration solution Pseudomonas alba, Thiobacillus, Ferrobacillus eat iron and caused by iron loss；Stable potential corrosion inhibiter
For reducing solution internal oxidation agent current potential, alleviate the trend that Complexing Iron is degraded by current potential.
The present invention be used for complex iron doctor solution technique be：Corrosion inhibiter is added portionwise in iron-based doctor solution in proportion
Dissolving, iron-based doctor solution contact with the gas of sulfur compound in hypergravity absorption plant, and the sulfide in gas phase is taken off by iron-based
Sulphur liquid absorbs rear oxidation into sulphur；Sulphur rich solution, which enters, regenerates desulfurization lean solution in super-gravity device, while the sulphur generated coagulates
Gather and periodically discharged after falling to regenerating unit bottom.
The corrosion of the invention for effectively alleviating desulphurization plant and doctor solution in Desulfurizing Process with Chelated Iron：(1) taken off in iron-based
The composite multi-functional corrosion inhibiter of the present invention is added in sulphur liquid technique, the oxide of more stable iron can be formed in equipment surface
Film, reduce corrosion current, increase polarization resistance, slow down the degree of spot corrosion, doctor solution by the oxide-film on thickening device surface
The sulfide of generation is not easy to form spot corrosion in this site deposition, prevents Fe3+Directly directly contact, can effectively drop with equipment surface
Corrosion of the low Complexing Iron doctor solution to device interior；(2) corrosion inhibiter has the function of reducing solution internal oxidation agent current potential, so as to
Alleviate Complexing Iron and degraded trend occurs due to current potential, there is stabilizer function to Complexing Iron；(3) corrosion inhibiter can make in bacterium
Protein denaturation, kill and iron, the Pseudomonas alba for eating sulphur, Thiobacillus, Ferrobacillus are eaten in doctor solution, reduce in Complexing Iron system
The loss of iron ensures the stability of doctor solution.
Present invention is mainly applied in the sulfur removal technologies such as oil field gas, sulfur-containing gas, coal chemical industry, the liquid used delays
Erosion agent can adapt to the change of various iron-based doctor solution concentration, and alleviate iron-based doctor solution reduces sweetening process to the burn into of equipment
The loss of middle iron-based doctor solution.
Brief description of the drawings
Fig. 1 is embodiment 1TAFEL curve synoptic diagrams.
Fig. 2 is the cyclic voltammetry curve schematic diagram of embodiment 3.
Embodiment
The present invention is further illustrated below by embodiment, but is not limited to following examples.
Embodiment 1：
A kind of composite multi-functional corrosion inhibiter suitable for Complexing Iron doctor solution, each component are as follows：
Sodium benzoate 0.2g/L,
Potassium sulfate 1g/L,
Sodium tungstate 0.1g/L,
Potassium silicate 0.2g/L,
KBr 0.5g/L,
Formaldehyde 1g/L,
Dodecyl sodium sulfate 0.2g/L；
Above-mentioned composite multi-functional corrosion inhibiter is used in doctor solution, technical process is：Corrosion inhibiter 0.64g/ hours are connected
Continuous be added in iron-based doctor solution is dissolved, and iron-based doctor solution contacts with the gas of sulfur compound in hypergravity absorption plant, gas
Sulfide in phase absorbs rear oxidation into sulphur by iron-based doctor solution；It is poor that sulphur rich solution enters regeneration desulfurization in super-gravity device
Liquid, while the sulphur flocking settling generated is periodically discharged behind regenerating unit bottom.
Using the corrosion rate and corrosion depth of TAFEL methods three-electrode system measure doctor solution, 1 the results are shown in Table.
Embodiment 2
A kind of composite multi-functional corrosion inhibiter suitable for Complexing Iron doctor solution, each component are as follows：
Sodium benzoate 0.05g/L,
Sodium sulphate 0.4g/L,
Sodium tungstate 0.02g/L,
Formaldehyde 0.35g/L,
Dodecyl sodium sulfate 0.026g/L；
Above-mentioned composite multi-functional corrosion inhibiter is continuously added in doctor solution by the technique 0.2g/ hours of embodiment 1.
Using the corrosion rate and corrosion depth of TAFEL methods three-electrode system measure doctor solution, 1 the results are shown in Table.
Embodiment 3
A kind of composite multi-functional corrosion inhibiter suitable for Complexing Iron doctor solution, each component are as follows：
Sodium benzoate 1g/L,
Sodium sulphate 6g/L,
Sodium tungstate 0.3g/L,
Potassium silicate 1g/L,
KBr 2g/L,
Formaldehyde 3.5g/L,
Paratoluenesulfonic acid sodium salt 1g/L；
Above-mentioned composite multi-functional corrosion inhibiter is continuously added in doctor solution by the technique 3g/ hours of embodiment 1.
Using the corrosion rate and corrosion depth of TAFEL methods three-electrode system measure doctor solution, 1 the results are shown in Table.
Embodiment 4
A kind of composite multi-functional corrosion inhibiter suitable for Complexing Iron doctor solution, each component are as follows：
Sodium benzoate 2g/L,
Potassium sulfate 8g/L,
Sodium tungstate 0.5g/L,
Potassium silicate 1g/L,
KI 5g/L,
Formaldehyde 5g/L,
Paratoluenesulfonic acid sodium salt 2g/L；
Above-mentioned composite multi-functional corrosion inhibiter is continuously added in doctor solution by the technique 4.7g/ hours of embodiment 1.
Using the corrosion rate and corrosion depth of TAFEL methods three-electrode system measure doctor solution, 1 the results are shown in Table.
Embodiment 5
A kind of composite multi-functional corrosion inhibiter suitable for Complexing Iron doctor solution, each component are as follows：
Sodium benzoate 0.05g/L,
Sodium sulphate 0.8g/L,
Sodium tungstate 0.01g/L,
Formaldehyde 0.7g/L,
Paratoluenesulfonic acid sodium salt 0.05g/L,
Dodecyl sodium sulfate 0.013g/L；
Above-mentioned composite multi-functional corrosion inhibiter is continuously added for doctor solution by the technique 0.34g/ hours of embodiment 1
In.Using the corrosion rate and corrosion depth of TAFEL methods three-electrode system measure doctor solution, 1 the results are shown in Table.
The experimental result of table 1
| Example number | Corrosion rate (μ A/cm2) | Corrosion depth (mm/a) | Inhibition efficiency (%) |
| Embodiment 1 | 0.0273 | 0.00032 | 99.991 |
| Embodiment 2 | 0.0185 | 0.000217 | 99.994 |
| Embodiment 3 | 0.0310 | 0.000363 | 99.990 |
| Embodiment 4 | 0.0202 | 0.000236 | 99.994 |
| Embodiment 5 | 0.0343 | 0.000401 | 99.989 |
As seen from Table 1, the performance indications of multi-functional corrosion inhibior of the present invention are as follows：Inhibition efficiency reaches more than 99%；Corrosion
Depth is 0.0001~0.0006mm/a, and 8~10 times are improved (according to national standard, to not than China's Corrosion of Stainless Steel depth
Steel corrosion depth of becoming rusty answers≤0.005mm/a)；Corrosion inhibiter has good stability, and is calculated using iron chelating capacity, after placing 45 days
Sedimentation rate is 0.5%.Chelating capacity is calculated by following formula：
C:Chelating capacity, g/L；
A：Absorbance, 1.
Fig. 1 is embodiment 1TAFEL curve synoptic diagrams.Calculated according to TAFEL curve maps：
1. the determination of corrosion rate
The tangent line of anodic polarization curves tangent line and cathodic polarization curve is done to the TAFEL curves of measurement, corresponding to intersection point
Ordinate is
Corrosion current log (I/A), then corrosion rate formula is as follows：
icorr:Corrosion rate, μ Acm-2；
Icorr：Corrosion current, μ A；
S：Working electrode sectional area, cm-2；
2. the determination of corrosion depth
Corrosion rate is converted into corrosion depth, conversion formula is as follows：
1μA/cm2=0.0117mm/a (3)
3. the determination of inhibition efficiency
Inhibition efficiency formula is as follows：
Z:Inhibition efficiency, %；
I0：Not plus corrosion inhibiter electric current, μ A；
Er：The abscissa of the current potential of reduction peak, i.e. crest, V；
Fig. 2 is the cyclic voltammetry curve schematic diagram of embodiment 3.Redox in solution is calculated according to cyclic voltammetry curve figure
Current potential formula is as follows：
Ep=Eo-Er (5)
Ep:The current potential of solution, i.e. Fe3+(L)/Fe2+(L) current potential of system, V；
Eo：The abscissa of the current potential of oxidation peak, i.e. trough, V.
Claims (2)
- A kind of 1. corrosion inhibiter suitable for iron-based doctor solution, it is characterised in that：It is made up of following component：The main inhibition of stable complexation iron Agent, stable complexation iron help corrosion inhibiter, antibacterial type corrosion inhibiter, stable potential corrosion inhibiter；The main corrosion inhibiter of stable complexation iron is mixture more than one or both of alkali metal sulfates, tungstates, is contained Measure as 27% ~ 57%；The stable complexation iron helps corrosion inhibiter as mixture more than one or both of alkali metal benzoate, silicate, Content is 3% ~ 15%；The antibacterial type corrosion inhibiter is KBr, KI, mixture more than one or both of formaldehyde, content is 18% ~ 66%；The stable potential corrosion inhibiter is dodecyl sodium sulfate, one or both of paratoluenesulfonic acid sodium salt, content is 3% ~ 11%；The content of each component is respectively in the corrosion inhibiter：The concentration of alkali metal sulfates is 0 ~ 10g/L in main corrosion inhibiter；The concentration of alkali tungstates is 0 ~ 0.5g/L in main corrosion inhibiter；The concentration for helping alkali metal benzoate in corrosion inhibiter is 0 ~ 2g/L；The concentration for helping alkali silicate in corrosion inhibiter is 0 ~ 2g/L；The concentration of KBr is 0 ~ 5g/L in antibacterial type corrosion inhibiter；The concentration of KI is 0 ~ 5g/L in antibacterial type corrosion inhibiter；The concentration of formaldehyde is 0 ~ 10g/L in antibacterial type corrosion inhibiter；The concentration of dodecane sulfonate is 0 ~ 2g/L in stable potential corrosion inhibiter；The concentration of tosilate is 0 ~ 5g/L in stable potential corrosion inhibiter.
- 2. the corrosion inhibiter of iron-based doctor solution according to claim 1, it is characterised in that：The concentration of the corrosion inhibiter For：0.05 ~ 25g corrosion inhibiter is needed to use in every liter of iron-based doctor solution.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1354038A (en) * | 2001-10-30 | 2002-06-19 | 南化集团研究院 | Improved complex iron method for removing sulfide from gas |
| CN101874968A (en) * | 2009-12-31 | 2010-11-03 | 中北大学 | Iron complex desulfurizer suitable for super-gravity desulfurization |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP3203797B2 (en) * | 1992-09-09 | 2001-08-27 | 栗田工業株式会社 | Corrosion protection for copper and iron materials |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1354038A (en) * | 2001-10-30 | 2002-06-19 | 南化集团研究院 | Improved complex iron method for removing sulfide from gas |
| CN101874968A (en) * | 2009-12-31 | 2010-11-03 | 中北大学 | Iron complex desulfurizer suitable for super-gravity desulfurization |
Non-Patent Citations (1)
| Title |
|---|
| 脱硫装置碳钢腐蚀缓蚀剂研发;黄琳;《腐蚀与防护》;20070531;全文 * |
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