CN112607873A - Scale and corrosion inhibitor for acidic wastewater evaporation system - Google Patents
Scale and corrosion inhibitor for acidic wastewater evaporation system Download PDFInfo
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- CN112607873A CN112607873A CN202011452294.3A CN202011452294A CN112607873A CN 112607873 A CN112607873 A CN 112607873A CN 202011452294 A CN202011452294 A CN 202011452294A CN 112607873 A CN112607873 A CN 112607873A
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- imidazoline
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- 230000007797 corrosion Effects 0.000 title claims abstract description 55
- 238000005260 corrosion Methods 0.000 title claims abstract description 55
- 239000003112 inhibitor Substances 0.000 title claims abstract description 34
- 238000001704 evaporation Methods 0.000 title claims abstract description 24
- 239000002351 wastewater Substances 0.000 title claims abstract description 19
- 230000002378 acidificating effect Effects 0.000 title claims abstract description 17
- 230000008020 evaporation Effects 0.000 title claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 33
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 30
- -1 imidazoline quaternary ammonium salt Chemical class 0.000 claims abstract description 29
- MTNDZQHUAFNZQY-UHFFFAOYSA-N imidazoline Chemical compound C1CN=CN1 MTNDZQHUAFNZQY-UHFFFAOYSA-N 0.000 claims abstract description 26
- 150000001412 amines Chemical class 0.000 claims abstract description 12
- 235000014113 dietary fatty acids Nutrition 0.000 claims abstract description 12
- 229930195729 fatty acid Natural products 0.000 claims abstract description 12
- 239000000194 fatty acid Substances 0.000 claims abstract description 12
- 150000004665 fatty acids Chemical class 0.000 claims abstract description 12
- 239000002253 acid Substances 0.000 claims abstract description 9
- 239000008367 deionised water Substances 0.000 claims abstract description 9
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 9
- 239000002270 dispersing agent Substances 0.000 claims abstract description 7
- DPUOLQHDNGRHBS-UHFFFAOYSA-N Brassidinsaeure Natural products CCCCCCCCC=CCCCCCCCCCCCC(O)=O DPUOLQHDNGRHBS-UHFFFAOYSA-N 0.000 claims abstract description 5
- URXZXNYJPAJJOQ-UHFFFAOYSA-N Erucic acid Natural products CCCCCCC=CCCCCCCCCCCCC(O)=O URXZXNYJPAJJOQ-UHFFFAOYSA-N 0.000 claims abstract description 5
- DPUOLQHDNGRHBS-KTKRTIGZSA-N erucic acid Chemical compound CCCCCCCC\C=C/CCCCCCCCCCCC(O)=O DPUOLQHDNGRHBS-KTKRTIGZSA-N 0.000 claims abstract description 5
- WRIDQFICGBMAFQ-UHFFFAOYSA-N (E)-8-Octadecenoic acid Natural products CCCCCCCCCC=CCCCCCCC(O)=O WRIDQFICGBMAFQ-UHFFFAOYSA-N 0.000 claims abstract 2
- LQJBNNIYVWPHFW-UHFFFAOYSA-N 20:1omega9c fatty acid Natural products CCCCCCCCCCC=CCCCCCCCC(O)=O LQJBNNIYVWPHFW-UHFFFAOYSA-N 0.000 claims abstract 2
- QSBYPNXLFMSGKH-UHFFFAOYSA-N 9-Heptadecensaeure Natural products CCCCCCCC=CCCCCCCCC(O)=O QSBYPNXLFMSGKH-UHFFFAOYSA-N 0.000 claims abstract 2
- 235000017060 Arachis glabrata Nutrition 0.000 claims abstract 2
- 241001553178 Arachis glabrata Species 0.000 claims abstract 2
- 235000010777 Arachis hypogaea Nutrition 0.000 claims abstract 2
- 235000018262 Arachis monticola Nutrition 0.000 claims abstract 2
- 239000005642 Oleic acid Substances 0.000 claims abstract 2
- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 claims abstract 2
- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 claims abstract 2
- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid Chemical compound CCCCCCCC\C=C/CCCCCCCC(O)=O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 claims abstract 2
- 235000020232 peanut Nutrition 0.000 claims abstract 2
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical group CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 16
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical group CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 claims description 14
- 229960000583 acetic acid Drugs 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 8
- 239000012362 glacial acetic acid Substances 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 8
- 238000010992 reflux Methods 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 8
- VILCJCGEZXAXTO-UHFFFAOYSA-N 2,2,2-tetramine Chemical compound NCCNCCNCCN VILCJCGEZXAXTO-UHFFFAOYSA-N 0.000 claims description 6
- RPNUMPOLZDHAAY-UHFFFAOYSA-N Diethylenetriamine Chemical compound NCCNCCN RPNUMPOLZDHAAY-UHFFFAOYSA-N 0.000 claims description 6
- 229960001124 trientine Drugs 0.000 claims description 6
- 239000003153 chemical reaction reagent Substances 0.000 claims description 4
- 238000005956 quaternization reaction Methods 0.000 claims description 4
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 2
- 229920001529 polyepoxysuccinic acid Polymers 0.000 claims description 2
- 239000011734 sodium Substances 0.000 claims description 2
- 229910052708 sodium Inorganic materials 0.000 claims description 2
- 230000005764 inhibitory process Effects 0.000 abstract description 18
- 229910017053 inorganic salt Inorganic materials 0.000 abstract description 8
- 239000013078 crystal Substances 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 239000000463 material Substances 0.000 abstract description 3
- GPRLSGONYQIRFK-UHFFFAOYSA-N hydron Chemical compound [H+] GPRLSGONYQIRFK-UHFFFAOYSA-N 0.000 abstract description 2
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 238000001179 sorption measurement Methods 0.000 abstract description 2
- 238000006243 chemical reaction Methods 0.000 description 11
- VKOBVWXKNCXXDE-UHFFFAOYSA-N icosanoic acid Chemical compound CCCCCCCCCCCCCCCCCCCC(O)=O VKOBVWXKNCXXDE-UHFFFAOYSA-N 0.000 description 6
- 229940074404 sodium succinate Drugs 0.000 description 6
- ZDQYSKICYIVCPN-UHFFFAOYSA-L sodium succinate (anhydrous) Chemical compound [Na+].[Na+].[O-]C(=O)CCC([O-])=O ZDQYSKICYIVCPN-UHFFFAOYSA-L 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- 239000002455 scale inhibitor Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- 239000008096 xylene Substances 0.000 description 2
- ISPYQTSUDJAMAB-UHFFFAOYSA-N 2-chlorophenol Chemical compound OC1=CC=CC=C1Cl ISPYQTSUDJAMAB-UHFFFAOYSA-N 0.000 description 1
- 239000010963 304 stainless steel Substances 0.000 description 1
- HPEGVXZOMRKGDS-UHFFFAOYSA-N 4,5-dihydro-1H-imidazole phenol Chemical compound C1(=CC=CC=C1)O.N1C=NCC1 HPEGVXZOMRKGDS-UHFFFAOYSA-N 0.000 description 1
- DQFHTTLBYCUWGM-UHFFFAOYSA-N 4-chlorobutan-1-ol;sodium Chemical compound [Na].OCCCCCl DQFHTTLBYCUWGM-UHFFFAOYSA-N 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 description 1
- 239000001361 adipic acid Substances 0.000 description 1
- 235000011037 adipic acid Nutrition 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 150000004945 aromatic hydrocarbons Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000012267 brine Substances 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 231100000053 low toxicity Toxicity 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/08—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents
- C02F5/10—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances
- C02F5/12—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances containing nitrogen
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/08—Corrosion inhibition
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Abstract
The invention discloses a scale and corrosion inhibitor for an acidic wastewater evaporation system, which comprises the following components in percentage by weight: 30-35% of imidazoline quaternary ammonium salt, 10-15% of dispersant and 50-60% of deionized water; the imidazoline quaternary ammonium salt is obtained by reacting high-carbon-chain fatty acid with organic amine under the action of a water carrying agent to obtain an imidazoline intermediate, and then reacting the imidazoline intermediate with a quaternizing agent; wherein the high-carbon-chain fatty acid is any one of peanut oleic acid, erucic acid and C21 dibasic acid. The scale and corrosion inhibitor has good corrosion and scale inhibition effects in an acidic wastewater evaporation system, imidazoline quaternary ammonium salt corrosion inhibition components synthesized by high-carbon-chain fatty acids are adsorbed on the surface of equipment pipeline materials to form a compact adsorption film, and hydrogen ion corrosion in acidic wastewater is prevented; the dispersant component can well disperse inorganic salt crystals, so that the inorganic salt crystals are difficult to aggregate on the surface of equipment to form inorganic salt scale, the scaling risk of the equipment is reduced, and the operation period of the equipment is prolonged.
Description
Technical Field
The invention belongs to the technical field of industrial acidic sewage treatment and environmental protection, and particularly relates to a compound scale and corrosion inhibitor.
Background
In the industrial acid wastewater treatment process, an evaporation and biochemical system treatment process is mostly adopted, and in an evaporation treatment unit, in order to prevent the acid wastewater from corroding system equipment and pipelines, alloy materials with good corrosion resistance are mostly adopted, and one-time investment is very high. In addition, in the operation process of the equipment, due to evaporation and concentration of the wastewater, inorganic salt is seriously scaled, the heat exchange effect is influenced, the equipment needs to be regularly descaled and cleaned, and the wastewater treatment cost is increased.
The corrosion and scale inhibitor for the acid medium mainly comprises inorganic corrosion inhibitors and organic corrosion inhibitors, wherein the organic corrosion inhibitors are commonly used corrosion inhibitors, and imidazoline corrosion inhibitors have wide application research in the acid medium due to low toxicity and good stability. The existing corrosion inhibitor has the defects that the scale can not be effectively inhibited while the corrosion inhibition rate is improved, or the dosage required by part of the corrosion inhibitor is very high, so that the medicament cost is greatly increased. Chinese patent CN 105152370A adopts adipic acid and triethylene tetramine to react to obtain adipic acid bis-imidazoline, then the adipic acid bis-imidazoline reacts with inorganic phosphide to obtain bis-imidazoline phosphonic acid, and the bis-imidazoline phosphonic acid is compounded to obtain the bis-imidazoline phosphonate corrosion and scale inhibitor, wherein the dosage is 100mg/L, the corrosion inhibition rate is 79.8%, and the carbonate scale inhibition rate is 83.6%; chinese patent CN 106832165A adopts organic carboxylic acid, diethylenetriamine, catalyst and aromatic hydrocarbon solvent to react to obtain imidazoline matrix, then reacts with chlorophenol and sodium hydroxide solution to obtain imidazoline phenol condensation compound, and then reacts with 4-chloro-1-hydroxybutane sodium sulfonate aqueous solution to obtain water-soluble imidazoline quaternary ammonium salt, and then the water-soluble imidazoline quaternary ammonium salt is compounded to obtain corrosion inhibitor, the dosage is 500ppm, and the corrosion inhibition rate is 96.21% -99.22%; chinese patent CN103723843A adopts organic acid, organic amine and benzene solution to react to obtain imidazoline, and then reacts with quaternization reagent to obtain the product, the dosage is 500ppm, and the corrosion inhibition rate is 93.3-96.8%. Therefore, a novel efficient corrosion and scale inhibitor which can prevent corrosion and effectively inhibit scale is needed to solve the problem of corrosion and scale formation of an acidic wastewater evaporation treatment system.
Disclosure of Invention
The invention aims to provide a compound scale and corrosion inhibitor which is used for an acidic wastewater evaporation treatment system to reduce equipment investment and treatment cost.
Aiming at the purposes, the scale and corrosion inhibitor adopted by the invention comprises the following components in percentage by weight: 30-35% of imidazoline quaternary ammonium salt, 10-15% of dispersant and 50-60% of deionized water; the imidazoline quaternary ammonium salt is obtained by reacting high-carbon-chain fatty acid with organic amine under the action of a water carrying agent to obtain an imidazoline intermediate, and then reacting the imidazoline intermediate with a quaternization reagent.
The preparation method of the imidazoline quaternary ammonium salt comprises the following steps: stirring and refluxing high-carbon-chain fatty acid and organic amine at 140-160 ℃ for reaction for 3-3.5 hours under the action of a water carrying agent, then heating to 220-240 ℃, evaporating the water carrying agent, continuing to react for 3-4 hours to obtain an imidazoline intermediate, cooling the imidazoline intermediate to 70-80 ℃, adding a quaternization reagent, and reacting for 2-3 hours at constant temperature to obtain the catalyst.
The high-carbon-chain fatty acid is any one of arachidic acid, erucic acid and C21 dibasic acid, the organic amine is any one of diethylenetriamine and triethylene tetramine, the quaternizing agent is glacial acetic acid, and the water carrying agent is xylene. The molar ratio of the high-carbon-chain fatty acid to the organic amine to the quaternizing agent is 1: 1.0-1.2: 0.7-1.0, and the mass ratio of the water carrying agent to the organic amine is preferably 1: 2.0-2.2.
The dispersant is polyepoxysuccinic acid sodium.
The invention has the following beneficial effects:
the scale and corrosion inhibitor has good corrosion and scale inhibition effects in an acidic wastewater evaporation system, imidazoline quaternary ammonium salt corrosion inhibition components synthesized by high-carbon-chain fatty acids are adsorbed on the surface of equipment pipeline materials to form a compact adsorption film, and hydrogen ion corrosion in acidic wastewater is prevented; the dispersant component can well disperse inorganic salt crystals, so that the inorganic salt crystals are difficult to aggregate on the surface of equipment to form inorganic salt scale, the scaling risk of the equipment is reduced, and the operation period of the equipment is prolonged.
Detailed Description
The present invention will be described in further detail with reference to examples, but the scope of the present invention is not limited to these examples.
Example 1
Putting 316g of arachidic acid and 103g of diethylenetriamine into a reaction kettle, adding 51g of dimethylbenzene as a water carrying agent, stirring and refluxing at 140 ℃ for 3h, then heating to 220 ℃, evaporating the water carrying agent, and continuing to react for 3h to obtain an imidazoline intermediate. And cooling the imidazoline intermediate to 80 ℃, adding 50g of glacial acetic acid, and reacting at constant temperature for 2h to obtain the imidazoline quaternary ammonium salt. 300g of imidazoline quaternary ammonium salt, 150g of polyepoxy sodium succinate and 550g of deionized water are compounded to obtain the scale and corrosion inhibitor product.
Example 2
Adding 341g of erucic acid and 112g of diethylenetriamine into a reaction kettle, adding 56g of dimethylbenzene as a water carrying agent, stirring and refluxing at 140 ℃ for reaction for 3h, then heating to 220 ℃, and continuing the reaction for 3.5h after the water carrying agent is evaporated out to obtain an imidazoline intermediate. And cooling the imidazoline intermediate to 80 ℃, adding 52g of glacial acetic acid, and reacting at constant temperature for 2.2h to obtain the imidazoline quaternary ammonium salt. 300g of imidazoline quaternary ammonium salt, 150g of polyepoxy sodium succinate and 550g of deionized water are compounded to obtain the scale and corrosion inhibitor product.
Example 3
Adding 320g C21 dibasic acid and 120g diethylenetriamine into a reaction kettle, stirring and refluxing 60g dimethylbenzene as a water carrying agent at 140 ℃ for 3h, then heating to 220 ℃, evaporating the water carrying agent and continuing to react for 3h to obtain an imidazoline intermediate. And cooling the imidazoline intermediate to 75 ℃, adding 55g of glacial acetic acid, and reacting at constant temperature for 2h to obtain the imidazoline quaternary ammonium salt. 300g of imidazoline quaternary ammonium salt, 150g of polyepoxy sodium succinate and 550g of deionized water are compounded to obtain the scale and corrosion inhibitor product.
Example 4
Adding 316g of arachidic acid and 146g of triethylene tetramine into a reaction kettle, adding 73g of dimethylbenzene as a water carrying agent, stirring and refluxing at 150 ℃ for 3 hours, heating to 230 ℃, evaporating the water carrying agent, and continuing to react for 4 hours to obtain an imidazoline intermediate. And cooling the imidazoline intermediate to 80 ℃, adding 60g of glacial acetic acid, and reacting at constant temperature for 2h to obtain the imidazoline quaternary ammonium salt. 300g of imidazoline quaternary ammonium salt, 150g of polyepoxy sodium succinate and 550g of deionized water are compounded to obtain the scale and corrosion inhibitor product.
Example 5
Adding 341g of erucic acid and 150g of triethylene tetramine into a reaction kettle, adding 75g of dimethylbenzene as a water carrying agent, stirring and refluxing at 150 ℃ for reaction for 3 hours, then heating to 230 ℃, evaporating the water carrying agent, and continuing to react for 4 hours to obtain an imidazoline intermediate. And cooling the imidazoline intermediate to 80 ℃, adding 50g of glacial acetic acid, and reacting at constant temperature for 2h to obtain the imidazoline quaternary ammonium salt. 300g of imidazoline quaternary ammonium salt, 150g of polyepoxy sodium succinate and 550g of deionized water are compounded to obtain the scale and corrosion inhibitor product.
Example 6
Adding 320g C21 dibasic acid and 140g triethylene tetramine into a reaction kettle, adding 70g xylene as a water carrying agent, stirring and refluxing at 140 ℃ for reaction for 3 hours, then heating to 240 ℃, evaporating the water carrying agent, and continuing to react for 4 hours to obtain an imidazoline intermediate. And cooling the imidazoline intermediate to 80 ℃, adding 55g of glacial acetic acid of the molar weight of the imidazoline intermediate, and reacting for 2 hours at constant temperature to obtain the imidazoline quaternary ammonium salt. 300g of imidazoline quaternary ammonium salt, 150g of polyepoxy sodium succinate and 550g of deionized water are compounded to obtain the scale and corrosion inhibitor product.
The performance of the scale and corrosion inhibitor prepared in the above examples 1 to 6 is evaluated, and the performance test method and evaluation index of the corrosion inhibitor for acidification, which are SY/T5405-2019 in the oil and gas industry standard of the people's republic of china, "calcium carbonate deposition method for measuring scale inhibition performance of water treatment agent", which is GB/T16632-2008 in the national standard of the people's republic of china, are referred to. The corrosion inhibition performance is determined by taking 5% sulfuric acid solution as a corrosion medium, taking 304 stainless steel as a hanging piece, keeping the temperature at 120 ℃ for 2 hours, and preparing artificial simulated brine by using a scale inhibition performance test medium according to standard requirements. The results are shown in Table 1.
TABLE 1 Scale and Corrosion inhibitor Performance test results
From the experimental results shown in table 1, the scale and corrosion inhibitor of the present invention has good corrosion and scale inhibition performance, and both the corrosion inhibition rate and the scale inhibition rate can reach more than 90% when the dosage is 70mg/L, wherein the corrosion inhibition rate of the scale and corrosion inhibitor prepared in example 6 reaches 97.6% and the scale inhibition rate reaches 96.4% when the dosage is 70 mg/L. According to the simulation experiment of the process conditions and the wastewater properties of the acidic wastewater evaporation system, the material specification of equipment is reduced, equipment pipelines in the system can be well protected, the economic benefit is good, and meanwhile, the scale inhibition performance can delay the inorganic salt scaling and prolong the operation period of the equipment.
Claims (6)
1. A scale and corrosion inhibitor for an acidic wastewater evaporation system is characterized in that: the scale and corrosion inhibitor comprises the following components in percentage by weight: 30-35% of imidazoline quaternary ammonium salt, 10-15% of dispersant and 50-60% of deionized water; the imidazoline quaternary ammonium salt is obtained by reacting high-carbon-chain fatty acid with organic amine under the action of a water carrying agent to obtain an imidazoline intermediate, and then reacting the imidazoline intermediate with a quaternizing agent; wherein the high-carbon-chain fatty acid is any one of peanut oleic acid, erucic acid and C21 dibasic acid.
2. The scale and corrosion inhibitor for an acidic wastewater evaporation system of claim 1, wherein: the imidazoline quaternary ammonium salt is obtained by stirring and refluxing high-carbon-chain fatty acid and organic amine at 140-160 ℃ for 3-3.5 hours under the action of a water carrying agent, then heating to 220-240 ℃, evaporating the water carrying agent, continuing to react for 3-4 hours to obtain an imidazoline intermediate, cooling the imidazoline intermediate to 70-80 ℃, adding a quaternization reagent, and reacting at constant temperature for 2-3 hours.
3. The scale and corrosion inhibitor for an acidic wastewater evaporation system according to claim 1 or 2, wherein: the organic amine is any one of diethylenetriamine and triethylene tetramine.
4. The scale and corrosion inhibitor for an acidic wastewater evaporation system according to claim 1 or 2, wherein: the quaternizing agent is glacial acetic acid, and the water carrying agent is dimethylbenzene.
5. The scale and corrosion inhibitor for an acidic wastewater evaporation system according to claim 1 or 2, wherein: the molar ratio of the high-carbon-chain fatty acid to the organic amine to the quaternizing agent is 1: 1.0-1.2: 0.7-1.0, and the mass ratio of the water carrying agent to the organic amine is 1: 2.0-2.2.
6. The scale and corrosion inhibitor for an acidic wastewater evaporation system according to claim 1, wherein: the dispersant is polyepoxysuccinic acid sodium.
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| CN202011452294.3A Pending CN112607873A (en) | 2020-12-10 | 2020-12-10 | Scale and corrosion inhibitor for acidic wastewater evaporation system |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4713184A (en) * | 1985-09-26 | 1987-12-15 | Zaid Najib H | Dispersed oil soluble corrosion inhibitor and water soluble phosphonate scale inhibitor composition |
| CN103602328A (en) * | 2013-10-28 | 2014-02-26 | 中国石油天然气股份有限公司 | Compounded imidazoline corrosion inhibitor and preparation method thereof |
| CN103723843A (en) * | 2013-12-13 | 2014-04-16 | 中国石油天然气股份有限公司 | Novel corrosion and scale inhibitor and preparation method thereof |
| CN104830303A (en) * | 2015-05-05 | 2015-08-12 | 中国石油天然气股份有限公司 | Corrosion and scale inhibition foaming drainage agent and preparation method and application thereof |
| CN109809573A (en) * | 2017-11-22 | 2019-05-28 | 中国石油化工股份有限公司 | A kind of steam flooding field recovered water corrosion inhibiter and preparation method thereof |
-
2020
- 2020-12-10 CN CN202011452294.3A patent/CN112607873A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4713184A (en) * | 1985-09-26 | 1987-12-15 | Zaid Najib H | Dispersed oil soluble corrosion inhibitor and water soluble phosphonate scale inhibitor composition |
| CN103602328A (en) * | 2013-10-28 | 2014-02-26 | 中国石油天然气股份有限公司 | Compounded imidazoline corrosion inhibitor and preparation method thereof |
| CN103723843A (en) * | 2013-12-13 | 2014-04-16 | 中国石油天然气股份有限公司 | Novel corrosion and scale inhibitor and preparation method thereof |
| CN104830303A (en) * | 2015-05-05 | 2015-08-12 | 中国石油天然气股份有限公司 | Corrosion and scale inhibition foaming drainage agent and preparation method and application thereof |
| CN109809573A (en) * | 2017-11-22 | 2019-05-28 | 中国石油化工股份有限公司 | A kind of steam flooding field recovered water corrosion inhibiter and preparation method thereof |
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