CN103864232B - General corrosion and scale inhibitor for purifying circulating water and preparation and application thereof - Google Patents
General corrosion and scale inhibitor for purifying circulating water and preparation and application thereof Download PDFInfo
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- CN103864232B CN103864232B CN201410088341.9A CN201410088341A CN103864232B CN 103864232 B CN103864232 B CN 103864232B CN 201410088341 A CN201410088341 A CN 201410088341A CN 103864232 B CN103864232 B CN 103864232B
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Abstract
The invention belongs to the field of water treatment, and relates to a general corrosion and scale inhibitor for purifying circulating water. The general corrosion scale inhibitor comprises the following components by weight percent: 15-50% of polyepoxysuccinic acid, 6-15% of etidronic acid, 2-7% of zinc sulfate, 1-10% of acrylic copolymer and 1-10% of benzotriazole. The corrosion scale inhibitor disclosed by the invention has an effect on most of corrosive water, and the scale inhibiting ratio is greater than 90%. Compared with polyhydric alcohol phosphate ester or phosphoric acid corrosion inhibitor mostly adopted at present, which pays attention to corrosion inhibition and reduces the scale inhibiting ratio, the product does not relate to any organophosphorus corrosion inhibitor, the corrosion inhibiting effect is good, and the corrosion inhibitors such as the polyhydric alcohol phosphate ester or a phosphoric acid and the like are not used. Therefore, the general corrosion scale inhibitor is low in phosphorus and free of nitrogen, is easily degraded under a natural condition, is small in effective dosage, which just is 10ppm in general, obvious in effect, large in stable range, and not acute to water quality change reaction, and the system operation security coefficient is high.
Description
Technical field
The invention belongs to water treatment field, be specifically related to additive and the Synthesis and applications thereof of recirculated water in a kind of metallurgical iron-making devices.
Background technology
Clean circulating water system is usually used in the indirect cooling of general device and the chilled water as interchanger.Mainly comprise the blast furnace of iron and steel enterprise, converter, the body of heater cooling of electric furnace and the cooling of continuous casting machine and crystallizer copper sleeve.
Clean circulating water system technical process is: water treatment station periodical feeding pumps water, through self-cleaning filter, for equipment cooling, then cools through cooling tower, enters water cooling pond, then absorbed water by water treatment station periodical feeding pump; Or cooling tower, to intake as interchanger chilled water after water cooling pond.This system has following characteristics:
1) when running, water temperature is high, and thermal load is large.Such as the transient temperature of crystallizer copper sleeving temperature reaches 1000 degree.
2) system water quality easily changes, and requires that medicament is to the wide ranges of water conditioning.
3) system water quality L.S.I(saturation index) mostly be negative, the Corrosive water quality that R.S.I index is greater than 6, easily to equipment corrosion, cause cooling duct to bore a hole.
In the chemistry in water treatment reagent combination of pre-treatment this respect, the PAPE that general use is a large amount of or Phosphoric Acid Corrosion Inhibitor, focus on inhibition and reduce scale inhibition performance, be not easy to accomplish that both take into account, therefore local scaling and underdeposit corrosion can be caused, to cause furnace wall pipe perforation, time serious, cause parking accident.China is vast in territory, and four corners of the world regional water quality difference is very large, the saltiness hundreds of mg/L of such as southeast underground water, and the saltiness of northwest underground water is hundreds of thousands of mg/L.The corrosion inhibiting and descaling agent of multiple-quality water can be adapted to, need to there is extremely strong surge capability, control water ions content in the scope of stabilizer pole.Current most of corrosion inhibiting and descaling agent is all through a large amount of tests, just can find out single-minded formulation product, and economy, actual effect and this product are incomparable.
Summary of the invention
For the weak point that this area exists, the object of the invention is to propose the general corrosion inhibiting and descaling agent of a kind of net circulating water.
Another object of the present invention is the preparation method proposing described corrosion inhibiting and descaling agent.
3rd object of the present invention is the application proposing described corrosion inhibiting and descaling agent.
Realizing above-mentioned purpose technical scheme of the present invention is:
The general corrosion inhibiting and descaling agent of a kind of net circulating water, is characterized in that, the composition containing following weight percent:
Polyepoxysuccinic acid salt (PESA) 15-50%, 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid (HEDP) 6-15%, zinc sulfate 2-7%, acrylic copolymer 1-10%, benzotriazole (BTA) 1-10%.
Preferably, described corrosion inhibiting and descaling agent contains the composition of following weight percent:
The water of polyepoxysuccinic acid salt 30-40%, 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid 10-15%, zinc sulfate 3-6%, acrylic copolymer 3-8%, benzotriazole 5-8%, surplus.
Wherein, described polyepoxysuccinic acid salt, 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid are all commercially available.On market, polyepoxysuccinic acid salt (PESA) is generally the polyepoxysuccinic acid salt of solid content 30-40%, the 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid that 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid (HEDP) is mass concentration 50-60%.
Wherein, described acrylic copolymer is polyacrylic acid and/or sodium polyacrylate (PAAS), and the solid content of described sodium polyacrylate is 30-50%.
Usually, described zinc sulfate is the form of the salt containing crystal water, such as Zinc Sulphate Heptahydrate.
Prepare the method for corrosion inhibiting and descaling agent of the present invention, it adds 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid and/or water in reaction vessel, then order drops into polyepoxysuccinic acid salt, zinc sulfate, sodium polyacrylate, benzotriazole in proportion, at 45-55 DEG C of temperature, stir 0.5-1 hour.
Preferably, temperature during input polyepoxysuccinic acid salt, zinc sulfate, sodium polyacrylate, benzotriazole in reaction vessel is 40-50 DEG C.
The application of corrosion inhibiting and descaling agent of the present invention in net circulating water water treatment.
Described corrosion inhibiting and descaling agent needs more than slaking 8h after having prepared.The slaking object of slow-release scale inhibitor ensures that product performance are stablized.After usual preparation completes, room temperature places the object that 1-7 days (accumulating time) namely reaches slaking.In the lab, in order to accelerate experiment process, product can be placed in the water-bath under constant temperature 90 DEG C of states, place 8h, reaching the object of slaking.
In described application, the add-on of described slow-release scale inhibitor in recirculated water is 10-15ppm.
Beneficial effect of the present invention is:
1, universal: can be effective to most of Corrosive water quality, scale inhibition performance be greater than more than 90%.Focus on inhibition with the PAPE of current a large amount of employing or Phosphoric Acid Corrosion Inhibitor and reduce compared with scale inhibition performance, this product does not relate to any organophosphorus corrosion inhibitor (except copper inhibitor), and corrosion mitigating effect is fine.
2, environment-friendly type: do not use the inhibiter such as PAPE or phosphoric acid, therefore low-phosphorous without nitrogen, degrade under easy natural condition.
3, economical: effectively less developer, generally adds only 10ppm, successful.
4, stable range is large.Not sharp to change of water quality reaction, system cloud gray model safety coefficient is high.
Accompanying drawing explanation
Fig. 1 is corrosion inhibiting and descaling agent performance testing device figure of the present invention.
In figure, 1 glass jar, 2 agitators, 3 power supplys, 4 temperature controllers, 5 heating tubes, 6 corrosion coupons.
Fig. 2 is hardness of limited carbonate experimental result.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.
Embodiment 1
Corrosion inhibiting and descaling agent composition: the water of the sodium polyacrylate 3% of 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid (HEDP) 10%, 94% Zinc Sulphate Heptahydrate 6%, 30% solid content of the polyepoxysuccinic acid salt (PESA) 30%, 50% of 38%, benzotriazole (BTA) 5%, surplus.
Preparation method is: add 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid and water in a kettle., it is 45 DEG C that temperature controls, then order drops into polyepoxysuccinic acid salt, zinc sulfate, sodium polyacrylate, benzotriazole in proportion, stirs 30 minutes, obtain clear amber liquid at 50 DEG C.
Corrosion inhibition rate is tested: according to GB GB/T18175-2000, make the device as Fig. 1: comprise glass jar 1, power supply 3, temperature controller 4, power supply 3 is connected with temperature controller 4, power supply 3 and temperature controller 4 are all arranged on outside glass jar 1, temperature controller 4 is also connected with corrosion coupon 6, and corrosion coupon 6 extend in glass jar 1.Power supply 3 is connected with heating tube 5, and heating tube 5 stretches in glass jar 1 and at the bottom of glass jar and lays, to provide uniform heating.Power supply 3 is also connected with agitator 2, and agitator 2 extend in glass jar 1.This device also can carry out hardness of limited carbonate test: get the water sample prepared, add anti-incrustation corrosion inhibitor.Stir, heat up, and keep water temperature at 45 ± 2 DEG C, one side evaporation concentration, one side adds water sample (adding same water stabilizer amount in water sample), to ensure that in glass jar, water level is constant continuously by tubualted bottle.In experimentation, regularly sample from glass jar, measure total alkalinity and chloride ion content.When Δ A>=0.2, (Δ A is the difference of chlorion concentration rate and total alkalinity concentration rate, Δ A=(Cl
- cylinder water/ Cl
- moisturizing-JD
cylinder water/ JD
moisturizing), in glass jar, the carbonate hardness value of water, is hardness of limited carbonate, can calculate concentration rate accordingly.
During test, in glass jar 1, fill water, consisting of of water: add CaCl in de-mineralized water
2, MgSO
4, NaHCO
3, preparation CaCl
2concentration is 6.0mmol/L, MgSO
4concentration is 4.0mmol/L, NaHCO
3concentration is the water sample of 10.0mmol/L, with NaOH, pH value is adjusted to 8.4.The temperature controlled in glass jar is 42 ± 1 DEG C, and stirring velocity is ... 60-90r/min.Through 168 hours, calculate corrosion speed b:
b=8760×(m
1－m
0)×10/(A.D.T)mm/a （1）
A: strip is long-pending, and (I type is 28cm
2),
M
0: test piece original quality g,
M
1: quality g after test piece cleaning,
D: test piece density g/cm
3(carbon steel is 7.85 stainless steels be 7.92 brass be 8.50 aluminium be 2.70),
T: the scavenging period h of test piece,
8760: the hours h/ suitable with 1 year,
10: the millimeter mm/cm suitable with 1cm.
In the present embodiment, corrosion coupon is 20# carbon steel material, b=0.012mm/a.
Embodiment 2
38%PESA (polyepoxysuccinic acid salt) 35% and 50%HEDP (1-Hydroxy Ethylidene-1,1-Diphosphonic Acid) 12%, 94% Zinc Sulphate Heptahydrate 9%, 30%PAAS (sodium polyacrylate) 5%, BTA (benzotriazole) 6%, distilled water 33% is added successively in proportion in reactor; Then stir 30 minutes, obtain clear amber liquid.
Preparation method is: add 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid and water in a kettle., it is 40 DEG C that temperature controls, then order drops into polyepoxysuccinic acid salt, zinc sulfate, sodium polyacrylate, benzotriazole in proportion, stirs 30 minutes, obtain clear amber liquid at 50 DEG C.
According to the apparatus and method test corrosion inhibition of embodiment 1.In the present embodiment, corrosion coupon is 20# carbon steel material, b=0.010mm/a.
Embodiment 3
Corrosion inhibiting and descaling agent composition: the water of the sodium polyacrylate 6% of 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid (HEDP) 15%, 94% Zinc Sulphate Heptahydrate 10%, 30% solid content of the polyepoxysuccinic acid salt (PESA) 40%, 50% of 38%, benzotriazole (BTA) 8%, surplus.
Preparation method is: add 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid and water in a kettle., it is 45 DEG C that temperature controls, then order drops into polyepoxysuccinic acid salt, zinc sulfate, sodium polyacrylate, benzotriazole in proportion, stirs 30 minutes, obtain clear amber liquid at 48 DEG C.
According to the apparatus and method test sustained release performance of embodiment 1.In the present embodiment, corrosion coupon is 20# carbon steel material, b=0.012mm/a.
Experimental example 1
Static-state scale inhibition experiment (water quality of Sichuan), specific experiment content comprises: thermal stability result experiment (experiment of residual harness method) and anti-clorox interference experiment.
Instrument: 1000W water-bath, Calcium Chloride Powder Anhydrous, magnesium sulfate, sodium bicarbonate, sodium hydroxide, clorox.
Medicament: embodiment 2 anti-incrustation corrosion inhibitor processed (hereinafter referred to as A), puts into ground triangular flask by A, be placed in the water-bath under constant temperature 90 DEG C of states, places 8h for subsequent use.Medicament after constant temperature 90 DEG C of 8h is referred to as B.
Prepare n ground triangular flask, and add different medicaments successively in n-1, chemical feeding quantity, by recirculated water 15mg/L, remains one and is used for blank assay (not with water conditioner).After de-mineralized water dilution, then add CaCl
2, MgSO
4, finally add NaHCO
3, preparation CaCl
2concentration is 6.0mmol/L, MgSO
4concentration is 4.0mmol/L, NaHCO
3concentration is 10.0mmol/L, with NaOH, pH value is adjusted to the 500ml water sample of 8.1 ~ 8.6.Clorox 3mg/L, 5mg/L is added respectively in part Experiment wherein.Ground triangular flask is placed in the water-bath under constant temperature 50 DEG C of states, places 16h.
After test, take out water sample, filter respectively with quantitative paper, and measure the Ca in filtrate
2+content.Calculation formula:
Scale inhibition performance (%)=filtered water Ca
2+/ preparation water Ca
2+× 100% (2)
Experimental result is in table 1.
Table 1 static-state scale inhibition experimental result
A agent is labeled as B agent through the high temperature of 8h and 90 degree.Maturing process in this experiment at 90 DEG C also demonstrates the resistance to elevated temperatures of this medicament, and the high temperature of experimental result display 90 degree does not reduce its scale-inhibiting properties.
Dynamic simulation experiment:
Specific experiment content comprises: with normal pressure saturation steam heating simulation interchanger, the on-the-spot flow velocity of Simulated cooling water, water quality, fluidised form, heat exchange material, heat transfer intensity, out temperature, cycles of concentration, pH value, conductivity value, water treatment add the main technologic parameters such as concentration, the corrosion inhibition of Comprehensive Assessment water conditioner and scale-inhibiting properties.
Adopt " dynamic analogue test of cooling water method " HG/T2160-2008.Testing apparatus is that skyscraping Electron equipment Co., Ltd of Jiangsu Gaoyou City produces.Medicament is embodiment 2 pharmacy agent thin up four times.With water for climbing the moisturizing of steel new 3# blast furnace, dispensing concentration adopts the medicament after 40ppm(dilution), moisturizing and continuous dosing mode administration of offeing medicine.Ultimate hardness experimental result is in table 3,4 and Fig. 2.
Table 2 processing condition
| Water coolant enters inlet temperature | 22±1℃ |
| Cooling water intakeoutfall temperature | 32±1℃ |
| Possess the water yield | 60L |
| Quantity of circulating water | 400L/h |
| Velocity in pipes | 2.4m/s |
| Developmental tube | φ 10mm × 1mm × 600mmQ235A carbon steel |
Water-quality guideline (in December, 2012 scene water intaking) tested by table 3
| Test event | Moisturizing | Experiment water quality |
| Calcium hardness is (with CaCO 3Meter), mg/l | 132.13 | 140.25 |
| Full basicity is (with CaCO 3Meter), mg/l | 120.12 | 118.22 |
| Chlorine root, mg/l | 59.95 | 60.43 |
| PH | 7.57 | 7.37 |
| Conductance, μ s/cm | 427 | 425 |
Table 4: ultimate hardness experimental result
Moisturizing Cl-is 59.95mg/L, even if scene is concentrated to 4 times, and still Cl
-<239.8mg/L.From experiment, system concentration rate controls at 3.95 times, the ρ (Cl in recirculated water
-) content is maximum is about 236mg/L, within the scope of the condition of water quality that the chlorion in circulating water system is suitable in material.
Table: 5 hardness of limited carbonate experimental results
Experimental example 2: static-state scale inhibition experiment (water quality of Earthquake of Anyang station in Henan)
Experimental technique is with experimental example 1.Experimental result is in table 6.
Scale inhibition performance (%) result of table 6 static-state scale inhibition experiment
Dynamic corrosion test method is with experimental example 1.
Along with concentration rate improves, recirculated water saltiness sharply increases, and severe corrosive ion content wherein also obviously increases, and this just increases the corrosion tendency of heat exchange pipeline.But it is known by developmental tube corrosion experiment result (see table 2.5), adopt the anti-incrustation corrosion inhibitor that the present invention proposes, the uniform corrosion rate carbon steel <0.075mm/a that uniform corrosion rate reaches " National Industrial Design of Circulation Cooling Water Treatment specification " (GB50050-2007) specifies, the requirement of stainless steel <0.005mm/a, lacing film is without spot corrosion.Corrosion experiment can be found out because the inhibition ingredient in water conditioner serves better protecting effect to pipeline; metal lacing film outward appearance is better; there is not obvious corrosion characteristics; and its surface has formed one deck and compares continuous print protective membrane, the erosion rate of lacing film has been less than prescribed value in national standard in addition.
Experimental example 3: static-state scale inhibition experiment (water quality of Taiyuan, Shanxi)
Experimental technique is with experimental example 1.Experimental result is in table 7.
Scale inhibition performance (%) result of table 7 static-state scale inhibition experiment
Dynamic corrosion test method is with experimental example 1.
Along with concentration rate improves, recirculated water saltiness sharply increases, and severe corrosive ion content wherein also obviously increases, and this just increases the corrosion tendency of heat exchange pipeline.Known by developmental tube corrosion experiment result, adopt the anti-incrustation corrosion inhibitor that the present invention proposes, the uniform corrosion rate stainless steel and carbon steel <0.075mm/a that uniform corrosion rate reaches " National Industrial Design of Circulation Cooling Water Treatment specification " (GB50050-2007) specifies, the requirement of stainless steel <0.005mm/a, lacing film is without spot corrosion.Corrosion experiment can be found out because the inhibition ingredient in water conditioner serves better protecting effect to pipeline; metal lacing film outward appearance is better; there is not obvious corrosion characteristics; and its surface has formed one deck and compares continuous print protective membrane, the erosion rate of lacing film has been less than prescribed value in national standard in addition.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the technology of the present invention principle; can also make some improvement and replacement, these improve and replace and also should be considered as protection scope of the present invention.
Claims (4)
1. the general corrosion inhibiting and descaling agent of net circulating water, is characterized in that, the composition containing following weight percent:
The water of polyepoxysuccinic acid salt 30-40%, 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid 10-15%, zinc sulfate 3-6%, acrylic copolymer 3-8%, benzotriazole 5-8%, surplus;
Wherein, described polyepoxysuccinic acid salt is the polyepoxysuccinic acid salt of solid content 30-40%, and described 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid is the 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid of mass concentration 50-60%;
Wherein, described acrylic copolymer is sodium polyacrylate, and the solid content of described sodium polyacrylate is 30-50%.
2. prepare the method for corrosion inhibiting and descaling agent according to claim 1, it is characterized in that, 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid and/or water is added in reaction vessel, then order drops into polyepoxysuccinic acid salt, zinc sulfate, sodium polyacrylate, benzotriazole in proportion, at 45-55 DEG C of temperature, stir 0.5-1 hour.
3. method according to claim 2, is characterized in that, temperature when input polyepoxysuccinic acid salt, zinc sulfate, sodium polyacrylate, benzotriazole in reaction vessel is 40-50 DEG C.
4. application rights requires that the corrosion inhibiting and descaling agent described in 1 carries out the method for net circulating water water treatment, and it is characterized in that, described corrosion inhibiting and descaling agent needs more than slaking 8h after having prepared; The add-on of described corrosion inhibiting and descaling agent in recirculated water is 10-15ppm.
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104609577A (en) * | 2014-12-25 | 2015-05-13 | 宁波市川宁环保科技有限公司 | Efficient composite bactericidal scale inhibitor and preparation method thereof |
| CN104773844B (en) * | 2015-04-24 | 2017-01-25 | 北京京诚科林环保科技有限公司 | Corrosion inhibitor for air-tight circulating cooling water system as well as preparation method and application thereof |
| CN105036358A (en) * | 2015-06-30 | 2015-11-11 | 苏州佑君环境科技有限公司 | Scale inhibitor for ash flushing water pipe and preparation method of scale inhibitor |
| CN105621637B (en) * | 2016-01-25 | 2018-05-25 | 延长油田股份有限公司 | A kind of antiseptic corrosion inhibitor and preparation method thereof |
| CN110606579B (en) * | 2019-09-06 | 2021-11-30 | 西安建筑科技大学 | Corrosion inhibitor for circulating cooling water and preparation method and application thereof |
| CN113848173A (en) * | 2021-10-27 | 2021-12-28 | 洛阳强龙实业有限公司 | Dynamic simulation test method for circulating water of non-phosphorus scale and corrosion inhibitor |
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