CN103808880A - Method for testing descaling performance of ternary compound descaling agent - Google Patents
Method for testing descaling performance of ternary compound descaling agent Download PDFInfo
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- CN103808880A CN103808880A CN201210482866.1A CN201210482866A CN103808880A CN 103808880 A CN103808880 A CN 103808880A CN 201210482866 A CN201210482866 A CN 201210482866A CN 103808880 A CN103808880 A CN 103808880A
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Abstract
The invention discloses a method for testing a descaling performance of a ternary compound descaling agent. The method comprises the following steps: (a) selecting multiple experiment containers, and cleaning and drying for later use; (b) mixing a DTPA (Diethylenetriamine Pentaacetic Acid) solution, an EDTA (Ethylene Diamine Tetraacetic Acid) disodium salt solution and an oxalic acid solution to prepare the ternary compound descaling agent; (c) respectively adding a certain amount of barium scale into the experiment containers; (d) respectively adding the ternary compound descaling agent solutions with different ratios into the experiment containers, and regulating the pH value; (e) heating the experiment containers in water baths at different temperatures; and (f) respectively calculating the descaling rate of the ternary compound descaling agent through the experimental results, and analyzing the optimal mixing ratio of the ternary compound descaling agent through the calculation results. According to the method, the descaling performance of the ternary compound descaling agents with the different ratios can be rapidly tested, the test results are accurate, the test steps are simple, and the test cost is greatly reduced.
Description
Technical field
The present invention relates to a kind of scale removal performance test methods of ternary built scale remover.
Background technology
Scale remover is a kind of incrustation scale of removing, and the chemicals of the multiple dirt stain such as dirt, generally forms by various ingredients is composite.Industrial scale remover is mainly used in removing heat transmission equipment, the dirt in boiler etc.
The conventional kind of scale remover and feature thereof:
(1) inorganic polyphosphate.This type of is the scale remover using the earliest, has limited use abroad.In its molecule, there is the P-O-P key of one or more repetitions to exist, can be divided into chain Quadrafos and cyclic polyphosphates.The shortcoming of inorganic polyphosphate is that moisture-sensitive hydrolysis generates orthophosphate, under high temperature and high pH value, more so, reacts and fouling as Ca2+, Mg2+ etc. with bivalent cation.
(2) organophosphate.The machine phosphate of common are has monoalkyl phosphoric acid esters, bisalkyl phosphate, pyrophosphate, polyoxyethylene aliphatic ether phosphate etc.In organophosphate, P-O-C key is stronger than phosphate P-O-P key, and therefore it is than phosphate-stabilized, and hydrolysis temperature is higher than phosphate.Seemingly, when use, consumption is unsuitable too high for the much character of phosphate and phosphoric acid salt, the too high dirt that easily generates on the contrary.Phosphate easily adheres to equipment surface, good with the compatibility of corrosion inhibiter etc., but easily there is emulsification with oils, so need to add non-emulsifier while use in oil field, hydrolysis phenomenon that can be resemble inorganic polyphosphate in the time that temperature exceedes 90 ℃, its hydrolysate also can react and fouling with divalent metal.Strontium sulfate white crystalline powder.Odorlessness.1g is dissolved in about 8800ml water, 700ml 3% nitric acid, 800ml 2% hydrochloric acid, is slightly soluble in alkali chloride solution, concentrated acid, is insoluble to ethanol and dilute sulfuric acid.Relative density 3.96.1605 ℃ of fusing points.Index of refraction 1.624.
(3) organic multicomponent phosphonic acids.C-P key in phosphonic acids is firm, therefore has higher chemical stability and thermal stability, also difficult hydrolysis under high temperature, high pH value condition, nontoxic or low toxicity.For example ethylenediamine tetraacetic methene phosphoric acid still can keep its activity under the high temperature of 200 ℃ and 1013kPa; Carboxyl ethylene-diphosphonic acid just decomposes under the high temperature of 250 ℃.Such scale remover is effective, and dosing is little, and has corrosion inhibition concurrently.Be widely used in oil field water treatment.
(4) aminopolycanboxylic acid's salt.Aminopolycanboxylic acid's salt is a kind of scale remover of better heat stability, as the serviceability temperature of EDTA can reach 200 ℃.This type of scale remover is mainly that the amount therefore adding is many by huge legendary turtle cooperation antiscale, and cost is high, so use and be restricted in the industrial process of a large amount of waters.
EDETATE DISODIUM Chinese disodium ethylene diamine tetraacetate, white crystalline powder, can be water-soluble, is dissolved in hardly ethanol, ether, and its pH value of water solution is about 5.3; As complexing agent, calcium, magnesium and other metal reagents, metal shadowing agent, disodium ethylene diamine tetraacetate is a kind of important complexing agent, for complexation of metal ions and separating metal.
DTPA usually uses as scale remover, and its Chinese name is diethyl pentetic acid, proterties: white crystal, be dissolved in hot water and aqueous slkali, and be slightly soluble in water, be insoluble to the organic solvent such as alcohol and ether; 230 ℃ of fusing points (decomposition), solubleness in water (20 ℃) 5g/L.Irritant, avoid sucking, avoid entering eyes; Purposes: efficient intercalating agent, closing property of huge legendary turtle is strong, is applied to color inhibitor in acrylic fiber production process, paper industry, water softener, textile auxiliary, huge legendary turtle is closed titrant etc.
Summary of the invention
The object of the invention is to overcome the shortcoming and defect of above-mentioned prior art, a kind of scale removal performance test methods of ternary built scale remover is provided, the method can test out the scale removal performance of the ternary built scale remover of different proportionings fast, and test result is accurate, testing procedure is simple, greatly reduces testing cost.
Object of the present invention is achieved through the following technical solutions: a kind of scale removal performance test methods of ternary built scale remover, comprises step: (a) first, choose several experiment containers, cleaning-drying is for subsequent use; (b) DTPA solution, EDETATE SODIUM salt solusion, oxalic acid solution are mixed with to ternary built scale remover; (c) then, in experiment container, add a certain amount of barium dirt; (d) in experiment container, add the ternary built scale remover solution of different proportion respectively, and regulate its pH value; (e) water-bath that experiment container is placed in respectively to temperature is heated: (f) result by experiment, calculate respectively the descaling rate of ternary built scale remover, and by result of calculation, analyze best ternary built scale remover blending ratio.
Described experiment container is beaker.
The concentration of described scale remover DTPA solution is 30mg/l.
The temperature of described water-bath is 100 ℃.
The described water-bath time is 48h.
Described pH value is adjusted to respectively 7.
In sum, the invention has the beneficial effects as follows: can test out fast the scale removal performance of the ternary built scale remover of different proportionings, and test result is accurate, testing procedure is simple, greatly reduces testing cost.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited only to this.
Embodiment:
The scale removal performance test methods of a kind of ternary built scale remover the present invention relates to, comprises step: (a) first, choose several experiment containers, cleaning-drying is for subsequent use; (b) DTPA solution, EDETATE SODIUM salt solusion, oxalic acid solution are mixed with to ternary built scale remover; (c) then, in experiment container, add a certain amount of barium dirt; (d) in experiment container, add the ternary built scale remover solution of different proportion respectively, and regulate its pH value; (e) water-bath that experiment container is placed in respectively to temperature is heated: (f) result by experiment, calculate respectively the descaling rate of ternary built scale remover, and by result of calculation, analyze best ternary built scale remover blending ratio.
Described experiment container is beaker.
The concentration of described scale remover DTPA solution is 30mg/l.
The temperature of described water-bath is 100 ℃.
The described water-bath time is 48h.
Described pH value is adjusted to respectively 7.
The experimental result recording by said method is as shown in the table:
As seen from the above table: after ternary is synthetic, combination solution rises overally to the descale effect of barium sulfate scale, illustrate and between weak acid, have mutual facilitation.And effect is best in the time that consumption of oxalic acid is 100ml; Thereby the optimum formula that obtains its ternary built is 50mg/L, DTPA, the 50mg/L of 100ml, the EDETATE DISODIUM of 100ml and 1g/L, the oxalic acid of 100ml.
The above, be only preferred embodiment of the present invention, not the present invention done to any pro forma restriction, every foundation technical spirit of the present invention, and any simple modification, equivalent variations that above embodiment is done, within all falling into protection scope of the present invention.
Claims (6)
1. a scale removal performance test methods for ternary built scale remover, is characterized in that, comprises step: (a) first, choose several experiment containers, cleaning-drying is for subsequent use; (b) DTPA solution, EDETATE SODIUM salt solusion, oxalic acid solution are mixed with to ternary built scale remover; (c) then, in experiment container, add a certain amount of barium dirt; (d) in experiment container, add the ternary built scale remover solution of different proportion respectively, and regulate its pH value; (e) water-bath that experiment container is placed in respectively to temperature is heated: (f) result by experiment, calculate respectively the descaling rate of ternary built scale remover, and by result of calculation, analyze best ternary built scale remover blending ratio.
2. the scale removal performance test methods of a kind of ternary built scale remover according to claim 1, is characterized in that, described experiment container is beaker.
3. the scale removal performance test methods of a kind of ternary built scale remover according to claim 1, is characterized in that, the concentration of described scale remover DTPA solution is 30mg/l.
4. the scale removal performance test methods of a kind of ternary built scale remover according to claim 1, is characterized in that, the temperature of described water-bath is 100 ℃.
5. the scale removal performance test methods of a kind of ternary built scale remover according to claim 1, is characterized in that, the described water-bath time is 48h.
6. the scale removal performance test methods of a kind of ternary built scale remover according to claim 1, is characterized in that, described pH value is adjusted to respectively 7.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107108294A (en) * | 2014-10-22 | 2017-08-29 | 格雷迪安特公司 | Selective fouling and correlation technique in desalted water processing system |
| CN114057326A (en) * | 2021-11-22 | 2022-02-18 | 三元控股集团杭州热电有限公司 | Water treatment method for steam boiler |
| US12023608B2 (en) | 2016-01-22 | 2024-07-02 | Gradiant Corporation | Hybrid desalination systems and associated methods |
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2012
- 2012-11-13 CN CN201210482866.1A patent/CN103808880A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107108294A (en) * | 2014-10-22 | 2017-08-29 | 格雷迪安特公司 | Selective fouling and correlation technique in desalted water processing system |
| US10696564B2 (en) | 2014-10-22 | 2020-06-30 | Gradiant Corporation | Selective scaling in desalination water treatment systems and associated methods |
| CN107108294B (en) * | 2014-10-22 | 2021-03-02 | 格雷迪安特公司 | Selective scaling in desalinated water treatment systems and related methods |
| CN112851000A (en) * | 2014-10-22 | 2021-05-28 | 格雷迪安特公司 | Selective scaling in desalinated water treatment systems and related methods |
| US12023608B2 (en) | 2016-01-22 | 2024-07-02 | Gradiant Corporation | Hybrid desalination systems and associated methods |
| CN114057326A (en) * | 2021-11-22 | 2022-02-18 | 三元控股集团杭州热电有限公司 | Water treatment method for steam boiler |
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Application publication date: 20140521 |