CN104355419A - Multifunctional scale and corrosion inhibitor and preparation method thereof - Google Patents
Multifunctional scale and corrosion inhibitor and preparation method thereof Download PDFInfo
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- CN104355419A CN104355419A CN201410721597.9A CN201410721597A CN104355419A CN 104355419 A CN104355419 A CN 104355419A CN 201410721597 A CN201410721597 A CN 201410721597A CN 104355419 A CN104355419 A CN 104355419A
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- corrosion inhibitor
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- water
- incrustation corrosion
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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
- C02F5/105—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 combined with inorganic substances
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
- B01D65/08—Prevention of membrane fouling or of concentration polarisation
-
- 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
- C02F5/125—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 combined with inorganic substances
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/10—Nature of the water, waste water, sewage or sludge to be treated from quarries or from mining activities
-
- 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
-
- 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
- C02F2303/22—Eliminating or preventing deposits, scale removal, scale prevention
Abstract
The invention discloses a multifunctional scale and corrosion inhibitor which integrates four effects, namely, scale inhibition, scale removal, corrosion inhibition and perfillmimg, and a preparation method thereof. The scale and corrosion inhibitor is of a nitrogen-free, non-phosphorus and molybdenum formula, and is prepared by compounding a non-phosphorus scale and corrosion inhibition component, methylbenzotriazole, hydrolytic polymaleic anhydride, sodium molybdate and sodium gluconate. According to the multifunctional scale and corrosion inhibitor, usage of phosphorus and nitrite is avoided, usage of molybdate is reduced, the multifunctional scale and corrosion inhibitor has the characteristics of being efficient, practical, non-toxic, environment-friendly, and low in cost, is applicable for scale and corrosion inhibition of water with high salinity and high degree of mineralization, can be widely applied to water treatment fields such as cold and hot circulating water, softened water and reverse osmosis, and the oilfield exploitation field.
Description
Technical field
The present invention relates to the method for Multifunction scale inhibitor mixture and this anti-incrustation corrosion inhibitor scale inhibition, inhibition in high salt, high-salinity water quality.
Background technology
Cold cycling water, process water, boiler feed water and water for cleaning etc. are mainly contained in the purposes of service water.Wherein, recirculated water consumption accounts for 80% of total water consumption, adopts the method improving cycles of concentration to economize on water at present.In the process of water cycle, because moisture evaporation causes the concentrated of all kinds of ion, material, circulation water hardness, basicity, pH value increase thereupon, very easily cause equipment scaling and corrosion.In addition, in order to reach boiler and process water requirement, water-supply source water needs after the process of water softening system could be for the production of, and owing to being subject to the impact of source water quality, water softening system is the corrosion of various degrees and scale problems also.Therefore, in order to protect production unit and pipeline, usually to add the mode of anti-incrustation corrosion inhibitor to slow down the generation of fouling corrosion phenomenon in actual production.In oilfield exploitation, by ensureing recovery ratio and recovery rate to the mode of reservoir water, in order to prevent from causing because of fouling stratum, pipeline blocking, add anti-incrustation corrosion inhibitor to reach the effect of scale inhibition, scale removal, inhibition.
Anti-incrustation corrosion inhibitor develops rapidly in recent years, present compound prescription is developed into by one-component formulation, utilize synergy, in line with environmental protection, efficient, economic principle, a series of Scale inhibitors, inhibiter are carried out compound, the multifunctional anti-incrustation corrosion inhibitor designed has been widely used in all types of industries production.The use reducing the harm such as expensive medicament and nitrite, chromic salt, the phosphoric acid salt surrounding materials such as molybdate is devoted to by Multifunction water conditioner, while raising scale inhibitor effect, more focus on economy and environmental protection.But defect needs to add different ingredients medicament for different water system, and add the complexity of use, unity and convenience are slightly poor.
Application number is disclose a kind of low-phosphorus antiincrustation corrosion inhibitor for circulating cooling system in the Chinese invention patent application file of 201210072475, have again application number be 201210435057 Chinese invention patent disclose a kind of for sealing and circulating softening water treatment system containing the anti-incrustation corrosion inhibitor of nitrite.All there are following two defects in two kinds of water conditioners: the use 1) can not avoiding phosphorus and nitrite completely; 2) different water treatment systems can not be generally applicable to.
Summary of the invention
For above-mentioned defect, the invention provides a kind of multifunctional anti-incrustation corrosion inhibitor, highly effective, economic environmental protection, good stability, use range is wide, be applicable to the water quality running environment such as cold/hot water, softening water, oil-field flooding, feedwater, also can be used in the film separating systems such as reverse osmosis membrane, nanofiltration membrane, ultra-filtration membrane.
Realizing technical scheme of the present invention is: provide a kind of anti-incrustation corrosion inhibitor, comprise non-phosphorus scale inhibition component, methyl benzotriazazole, hydrolytic polymaleic anhydride, Sodium orthomolybdate, Sunmorl N 60S, wherein non-phosphorus scale inhibition component is one or both of poly aspartic acid and poly-epoxy succinic acid.
Above-mentioned anti-incrustation corrosion inhibitor, described component and ratio of quality and the number of copies are: poly aspartic acid 7 ~ 14 parts; Methyl benzotriazazole 0.5 ~ 1 part; Hydrolytic polymaleic anhydride 2 parts; Sodium orthomolybdate 2 ~ 4 parts; Sunmorl N 60S 10 ~ 20 parts.
Above-mentioned anti-incrustation corrosion inhibitor, described component and ratio of quality and the number of copies are: poly-epoxy succinic acid 8 ~ 16 parts; Methyl benzotriazazole 0.5 ~ 1 part; Hydrolytic polymaleic anhydride 2 parts; Sodium orthomolybdate 2 ~ 4 parts; Sunmorl N 60S 10 ~ 20 parts.
Above-mentioned anti-incrustation corrosion inhibitor, described component and ratio of quality and the number of copies are: poly aspartic acid 3 ~ 6 parts; Poly-epoxy succinic acid 5 ~ 10 parts; Methyl benzotriazazole 0.5 ~ 1 part; Hydrolytic polymaleic anhydride 2 parts; Sodium orthomolybdate 2 ~ 4 parts; Sunmorl N 60S 10 ~ 20 parts.
The present invention is directed to the problem that fouling corrosion easily occurs industrial water system, there is provided a kind of for the anti-incrustation corrosion inhibitor in the systems such as recirculated water, softening water, reverse osmosis, oil-field flooding, effectively alleviate the fouling in industrial water system, etching problem, greatly extend the work-ing life of e-quipment and pipe, save running cost.
Beneficial effect of the present invention:
Anti-incrustation corrosion inhibitor of the present invention is that combine composite forming by non-phosphorus scale inhibition component, methyl benzotriazazole, hydrolytic polymaleic anhydride, Sodium orthomolybdate, Sunmorl N 60S, system component has obvious synergistic function without nitrogen, non-phosphorus, molybdenum system formula.This formulation environments Pollution risk is low, and effectively reduces cost of water treatment due to the usage quantity decreasing Sodium orthomolybdate.
Non-phosphorus scale inhibition component of the present invention is one or both of poly aspartic acid (PASP) and poly-epoxy succinic acid (PESA).This component is a kind of environmentally friendly medicament, and biodegradability is good, and meta-bolites non-secondary pollution endangers, and has good scale-inhibiting properties, is particularly applicable to high-alkali, haline water system.
In the present invention, methyl benzotriazazole (TTA) is a kind of inhibiter and rust-preventive agent.TTA is adsorbed in metal and metal alloy surface, forms fine and close protective membrane, is highly resistant to oxygenizement to protect plant and instrument.
Hydrolytic polymaleic anhydride is a kind of scale inhibitor composition, incrustation scale can not only be suppressed to generate, peel off old dirt, also have certain corrosion mitigating effect, effectively can improve inhibition efficiency with other components are composite.This component can with the calcium in water, magnesium plasma chelating, make it be stabilized in water with chelate, simultaneously can promote sedimentary lattice distortion, improve the mobility of sludge.Low dosage uses this composition can obtain high scale inhibition usefulness, is mainly used in the water treatment of the systems such as industrial cold/hot water, boiler soft water.
Sodium orthomolybdate is the inhibiter that a kind of toxicity is lower, cost is higher, can form fine and close protective membrane occur with effective inhibiting point corrosion in metallic surface.In order to reduce cost of water treatment, using Sodium orthomolybdate often to add gluconate, benzotriazole, poly-phosphate etc. and carrying out with it composite, not only reducing the consumption of Sodium orthomolybdate, effectively can also improve corrosion mitigating effect.Sodium orthomolybdate thermostability is high, can be used for local superheating and the high system of heat flow density.
Sunmorl N 60S is a kind of with low cost, biodegradable is strong, risk of environmental pollution is low corrosion-mitigation scale-inhibition composition, to calcium, magnesium, molysite, there is very strong complex ability, wherein there is good sequestering action to ferric iron, produce obvious synergistic effect time composite with all kinds of formulas such as molybdenum, silicon, phosphorus, tungsten, corrosion mitigating effect significantly promotes.Different from general inhibiter, the corrosion mitigating effect of Sunmorl N 60S strengthens with the rising of temperature, the general inhibiter of this feature supplements defect that inhibition usefulness reduces in high temperature water system, and then expand the scope of application of compound prescription, make this formula more be applicable to the high circulating water system of heat flow density.
Chemically stable of the present invention and thermostability high, resistance of oxidation is strong, scale inhibitor successful, the work-ing life of plant and instrument can be extended, thus indirectly save the cost of maintenance of equipment, reduce the financial loss stopping production and bring, avoid the very big hidden danger in industrial production.
Compound prescription of the present invention avoids the use of phosphorus, nitrite, and reduces the use of molybdate, has asepsis environment-protecting, feature with low cost.
Each component synergy in the present invention's formula, stronger tolerance is had to water quality, fluctuating temperature, feedwater pH value can effectively control inorganics fouling in 5 ~ 10 scopes, can be used for the water treatment in the different systems such as softening water, recirculated water, reverse osmosis, oil-field flooding according to water quality situation adjustment dosage.
specific implementation method
The invention provides a kind of preparation method of above-mentioned anti-incrustation corrosion inhibitor, be specially: inject a certain amount of deionized water to reactor, add poly aspartic acid, poly-epoxy succinic acid, hydrolytic polymaleic anhydride, Sunmorl N 60S by proportioning simultaneously, be uniformly mixed at constant temperature 35 DEG C; Sodium orthomolybdate, methyl benzotriazazole is added successively, after being heated to 55 DEG C, with stirring sustained reaction 60 minutes by proportioning; Stop heating, continue stirring 30 minutes; Leave standstill 30 minutes, opening vent valve, this anti-incrustation corrosion inhibitor finished product can be obtained by being packaged into bucket after medical filtration.
Embodiment 1:
Take poly aspartic acid 10.5kg, hydrolytic polymaleic anhydride 3kg, Sunmorl N 60S 15kg, Sodium orthomolybdate 3kg, methyl benzotriazazole 0.75kg; Anti-incrustation corrosion inhibitor numbering R1 is obtained by above-mentioned preparation method.
Embodiment 2:
Take poly-epoxy succinic acid 12kg, hydrolytic polymaleic anhydride 3kg, Sunmorl N 60S 15kg, Sodium orthomolybdate 3kg, methyl benzotriazazole 0.75kg; Anti-incrustation corrosion inhibitor numbering R2 is obtained by above-mentioned preparation method.
Embodiment 3:
Take poly aspartic acid 4.5kg, poly-epoxy succinic acid 7.5kg, hydrolytic polymaleic anhydride 3kg, Sunmorl N 60S 15kg, Sodium orthomolybdate 3kg, methyl benzotriazazole 0.75kg; Anti-incrustation corrosion inhibitor numbering R3 is obtained by above-mentioned preparation method.
Embodiment 4:
Take poly aspartic acid 4.5kg, poly-epoxy succinic acid 7.5kg, hydrolytic polymaleic anhydride 3kg, Sunmorl N 60S 15kg, Sodium orthomolybdate 2kg, methyl benzotriazazole 0.75kg; Anti-incrustation corrosion inhibitor numbering R4 is obtained by above-mentioned preparation method.
The research of embodiment anti-incrustation corrosion inhibitor use properties:
Test condition of water quality is as shown in table 1 below.
Table 1. simulated wastewater water-quality guideline
Test method: 1) a certain amount of simulated wastewater is placed in dynamic testing equipment, carries out waste water circulation under 60 DEG C of water temperature conditions; 2) control refill flow, constant level in holding device, inserts carbon steel coupon, and the anti-incrustation corrosion inhibitor adding 15mg/L is tested.
Continuous operation 150h, timing measures total hardness and total alkalinity, and test endpoint takes out carbon steel test piece.Detect according to discharge, heat medium temperature, the calculation of parameter such as the temperature head of intake-outlet goes out scale inhibition performance.Erosion rate is calculated according to test piece quality change.By the mass loss of the carbon steel coupon in contrast blank test and dosing test, calculate corrosion inhibition rate.
Test-results is as shown in table 2 below.
Table 2. anti-incrustation corrosion inhibitor use properties result of study
Claims (7)
1. the invention provides a kind of anti-incrustation corrosion inhibitor, it is characterized in that: this anti-incrustation corrosion inhibitor consists of non-phosphorus scale inhibition component, methyl benzotriazazole, hydrolytic polymaleic anhydride, Sodium orthomolybdate, Sunmorl N 60S.
2. anti-incrustation corrosion inhibitor according to claim 1, is characterized in that, described non-phosphorus scale inhibition component is one or both of poly aspartic acid and poly-epoxy succinic acid.
3. anti-incrustation corrosion inhibitor according to claim 1 and 2, is characterized in that, component and quality proportioning thereof are: poly aspartic acid 7 ~ 14 parts; Methyl benzotriazazole 0.5 ~ 1 part; Hydrolytic polymaleic anhydride 2 parts; Sodium orthomolybdate 2 ~ 4 parts; Sunmorl N 60S 10 ~ 20 parts.
4. anti-incrustation corrosion inhibitor according to claim 1 and 2, is characterized in that, component and quality proportioning thereof are: poly-epoxy succinic acid 8 ~ 16 parts; Methyl benzotriazazole 0.5 ~ 1 part; Hydrolytic polymaleic anhydride 2 parts; Sodium orthomolybdate 2 ~ 4 parts; Sunmorl N 60S 10 ~ 20 parts.
5. anti-incrustation corrosion inhibitor according to claim 1 and 2, is characterized in that, component and quality proportioning thereof are: poly aspartic acid 3 ~ 6 parts; Poly-epoxy succinic acid 5 ~ 10 parts; Methyl benzotriazazole 0.5 ~ 1 part; Hydrolytic polymaleic anhydride 2 parts; Sodium orthomolybdate 2 ~ 4 parts; Sunmorl N 60S 10 ~ 20 parts.
6. the preparation method of the anti-incrustation corrosion inhibitor according to right 1 or 2, it is characterized in that, be specially: add poly aspartic acid, poly-epoxy succinic acid, hydrolytic polymaleic anhydride, Sunmorl N 60S successively by proportioning, Sodium orthomolybdate, methyl benzotriazazole, leave standstill after Keep agitation certain hour and obtain this anti-incrustation corrosion inhibitor.
7. the anti-incrustation corrosion inhibitor described in claim 1 or 2 is applied in the film separating systems such as water quality running environment and reverse osmosis membrane, nanofiltration membrane, ultra-filtration membrane such as cold/hot water, softening water, oil-field flooding, feedwater.
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| CN201410721597.9A CN104355419A (en) | 2014-12-03 | 2014-12-03 | Multifunctional scale and corrosion inhibitor and preparation method thereof |
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| CN201410721597.9A CN104355419A (en) | 2014-12-03 | 2014-12-03 | Multifunctional scale and corrosion inhibitor and preparation method thereof |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105540884A (en) * | 2015-12-15 | 2016-05-04 | 攀枝花钢城集团瑞天安全环保有限公司 | Composite corrosion and scale inhibitor suitable for high temperature and preparation method thereof |
| CN106244236A (en) * | 2016-08-30 | 2016-12-21 | 山东恒信科技发展有限公司 | A kind of anti-incrustation corrosion inhibitor for hydrogenation plant and preparation method thereof |
| CN106587390A (en) * | 2016-12-12 | 2017-04-26 | 中国石油天然气集团公司 | Biological calcium, barium and strontium resisting water injection scale inhibitor |
| CN106587391A (en) * | 2016-12-17 | 2017-04-26 | 安徽省蓝天能源环保科技有限公司 | High-efficiency phosphorus-free scale and corrosion inhibitor for low-temperature multi-effect distillation sea water desalination device |
| CN106673217A (en) * | 2017-03-21 | 2017-05-17 | 湖北道淳化学有限公司 | Non-phosphorus scale and corrosion inhibitor and application thereof |
| CN106757047A (en) * | 2016-11-10 | 2017-05-31 | 武汉钢铁股份有限公司 | A kind of environmentally friendly corrosion inhibitor of sea water |
| CN106809963A (en) * | 2017-03-06 | 2017-06-09 | 王仲贤 | It is without phosphorus without sodium water-treating agent of boiler |
| CN106830376A (en) * | 2017-03-06 | 2017-06-13 | 王仲贤 | Without phosphorus low sodium water-treating agent of boiler |
| CN107936920A (en) * | 2017-12-04 | 2018-04-20 | 大连盐化集团有限公司 | A kind of environmentally friendly liquid deicing salt preparation method |
| CN108251828A (en) * | 2017-10-31 | 2018-07-06 | 福州盈科水处理工程有限公司 | A kind of prefilming agent after hydrochloric acid cleaning |
| CN108996714A (en) * | 2018-08-24 | 2018-12-14 | 广州科宝水处理科技有限公司 | A kind of recirculated cooling water phosphate-free corrosion inhibition antisludging agent |
| CN109052675A (en) * | 2018-08-16 | 2018-12-21 | 科威天使环保科技集团股份有限公司 | Environment-friendly type anti-incrustation corrosion inhibitor and preparation method thereof |
| CN110818099A (en) * | 2019-12-09 | 2020-02-21 | 广东科威莱环保科技有限公司 | Water circulation dirt treating agent |
| CN110980971A (en) * | 2019-12-16 | 2020-04-10 | 武汉中新同和科技有限责任公司 | Non-phosphorus scale and corrosion inhibitor for industrial circulating water and preparation method thereof |
| CN113860521A (en) * | 2021-11-05 | 2021-12-31 | 山东艾普特暖通技术有限公司 | Solid phosphorus-free water quality stabilizer for heating water and preparation method thereof |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105540884B (en) * | 2015-12-15 | 2018-08-28 | 攀枝花钢城集团瑞天安全环保有限公司 | Composite slow-corrosion scale resistor and preparation method thereof suitable for high temperature |
| CN105540884A (en) * | 2015-12-15 | 2016-05-04 | 攀枝花钢城集团瑞天安全环保有限公司 | Composite corrosion and scale inhibitor suitable for high temperature and preparation method thereof |
| CN106244236A (en) * | 2016-08-30 | 2016-12-21 | 山东恒信科技发展有限公司 | A kind of anti-incrustation corrosion inhibitor for hydrogenation plant and preparation method thereof |
| CN106757047A (en) * | 2016-11-10 | 2017-05-31 | 武汉钢铁股份有限公司 | A kind of environmentally friendly corrosion inhibitor of sea water |
| CN106587390A (en) * | 2016-12-12 | 2017-04-26 | 中国石油天然气集团公司 | Biological calcium, barium and strontium resisting water injection scale inhibitor |
| CN106587391A (en) * | 2016-12-17 | 2017-04-26 | 安徽省蓝天能源环保科技有限公司 | High-efficiency phosphorus-free scale and corrosion inhibitor for low-temperature multi-effect distillation sea water desalination device |
| CN106809963A (en) * | 2017-03-06 | 2017-06-09 | 王仲贤 | It is without phosphorus without sodium water-treating agent of boiler |
| CN106830376A (en) * | 2017-03-06 | 2017-06-13 | 王仲贤 | Without phosphorus low sodium water-treating agent of boiler |
| CN106673217A (en) * | 2017-03-21 | 2017-05-17 | 湖北道淳化学有限公司 | Non-phosphorus scale and corrosion inhibitor and application thereof |
| CN108251828A (en) * | 2017-10-31 | 2018-07-06 | 福州盈科水处理工程有限公司 | A kind of prefilming agent after hydrochloric acid cleaning |
| CN107936920A (en) * | 2017-12-04 | 2018-04-20 | 大连盐化集团有限公司 | A kind of environmentally friendly liquid deicing salt preparation method |
| CN109052675A (en) * | 2018-08-16 | 2018-12-21 | 科威天使环保科技集团股份有限公司 | Environment-friendly type anti-incrustation corrosion inhibitor and preparation method thereof |
| CN108996714A (en) * | 2018-08-24 | 2018-12-14 | 广州科宝水处理科技有限公司 | A kind of recirculated cooling water phosphate-free corrosion inhibition antisludging agent |
| CN110818099A (en) * | 2019-12-09 | 2020-02-21 | 广东科威莱环保科技有限公司 | Water circulation dirt treating agent |
| CN110980971A (en) * | 2019-12-16 | 2020-04-10 | 武汉中新同和科技有限责任公司 | Non-phosphorus scale and corrosion inhibitor for industrial circulating water and preparation method thereof |
| CN110980971B (en) * | 2019-12-16 | 2022-05-13 | 武汉中新同和科技有限责任公司 | Non-phosphorus scale and corrosion inhibitor for industrial circulating water and preparation method thereof |
| CN113860521A (en) * | 2021-11-05 | 2021-12-31 | 山东艾普特暖通技术有限公司 | Solid phosphorus-free water quality stabilizer for heating water and preparation method thereof |
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Application publication date: 20150218 |