WO2004072327A1 - Composition et procede permettant d'eliminer du tartre et/ou d'empecher la formation de tartre dans un equipement de traitement - Google Patents

Composition et procede permettant d'eliminer du tartre et/ou d'empecher la formation de tartre dans un equipement de traitement Download PDF

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Publication number
WO2004072327A1
WO2004072327A1 PCT/EP2004/050134 EP2004050134W WO2004072327A1 WO 2004072327 A1 WO2004072327 A1 WO 2004072327A1 EP 2004050134 W EP2004050134 W EP 2004050134W WO 2004072327 A1 WO2004072327 A1 WO 2004072327A1
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WO
WIPO (PCT)
Prior art keywords
composition
elements
equipment
processing equipment
acid
Prior art date
Application number
PCT/EP2004/050134
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English (en)
Inventor
Jacobus Cornelis Van Kaam
Original Assignee
Exel, Hendrikus, Gerrit
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Exel, Hendrikus, Gerrit filed Critical Exel, Hendrikus, Gerrit
Publication of WO2004072327A1 publication Critical patent/WO2004072327A1/fr

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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
    • C02F5/12—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
    • 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
    • C02F5/14—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 phosphorus
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/02—Temperature
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/30—Wastewater or sewage treatment systems using renewable energies
    • Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy

Definitions

  • the invention pertains to a descaling composition and a method for removing and/or preventing scaling of elements in processing equipment, comprising the introduction of said composition.
  • the treatment of cooling water for various purposes is a problem, which appears in industrial equipment of many industries, which includes condensers, heat exchangers, power plants, refineries, oil drill equipment, vacuum waste drain systems, piping systems, diesel engines, compressors, and air conditioning systems.
  • the following problems may occur in varying degrees in each of these types of systems: control of scale deposits, corrosion of metals, and biological growths.
  • the solubility of calcium carbonate is also determined by the pH conditions maintained in the system and by the total minerals present.
  • Another deposit likely to be encountered in cooling water systems is calcium sulfate.
  • sulfuric acid to the water to control scale deposits of calcium carbonate. Normally, sufficient acid is added to bring the pH of the water to the range of about 6 to 6.5.
  • calcium sulfate which is produced by the reaction of the carbonate with sulfuric acid, is much more soluble than the carbonate, it is entirely possible to exceed the solubility of calcium sulfate in the circulating cooling water and have that compound precipitated as a scale.
  • Calcium phosphate is also precipitated, particularly where treating methods using polyphosphates are employed and high orthophosphate and calcium concentrations exist.
  • Iron-containing deposits ' can result either from relatively high concentrations of iron being present in the water supply or by active corrosion taking place in the system.
  • Some water supplies also contain relatively large concentrations of silica, which may result in the deposition of this material along the surfaces.
  • Wood surfaces of cooling towers are frequently presented with the problem of microorganism growth. For example, algae and bacteria from the water and the air as well as fungi attach themselves to the wooden surfaces of the tower and result in the formation of a slime, which in many instances poses as difficult a problem as scale deposits. The presence of slime interferes with normal flow in piping, normal heat transfer in heat exchangers as well as accelerates the rotting of the wood.
  • Vacuum (toilet) waste line systems are also well known to suffer from blockages caused by hard-scale formation.
  • This deposit consists mostly of phosphate and magnesium.
  • This deposit is not, as commonly stated a variant of calcification, but is mainly magnesium phosphate, which is a major component of urine stone.
  • the equipment In the acid method the equipment is flushed with the acid or the metal parts are immersed in an acid bath. Some materials, however, are not resistant to these strong acids.
  • water In the high-pressure method water is pressed through a nozzle having a usually 0.2 mm diameter opening at a pressure of up to 2,500 bar. Such extremely high pressures are dangerous and for safety reasons not longer acceptable in many cases.
  • Australian patent application No. AU 9,151,482 discloses a method of descaling a solar collector, which contains metal pipes by using an aqueous composition containing sulfamic acid. To sequester dissolved metal tolutriazole may be added to the composition. It was however found that such compositions are rather aggressive and affect metal parts, leading to substantial corrosion (weight loss) of such treated metal.
  • French patent application No. 2,469,450 describes a toilet cleaner comprising an acid, particularly sulfamic acid or citric acid, and optionally an undefined corrosion inhibitor. Specific acid - corrosion inhibitor compositions that are effective as descalers and not damaging to the surface to be treated, have not been disclosed.
  • US patent No. US 4,765,921 discloses cleaning compositions for industrial and sanitary installations comprising a water-soluble polymer and a strong acid.
  • the strong acid may be phosphoric acid, phosphonic acid, hydrochloric acid or sulfamic acid.
  • the composition may optionally contain a corrosion inhibitor.
  • Specifically disclosed compositions comprise phosphoric acid or hydrochloric acid and benzotriazole.
  • the above prior art compositions have the disadvantage that they insufficiently remove scaling or that they are too aggressive and affect the materials to be cleaned. Further, none of the known compositions have been mentioned to be suitable for cleaning industrial equipment without dismantling said equipment.
  • the present invention provides a composition that meets the requirements of monitoring and a composition that is effective when used on various materials.
  • a descaling composition for use to elements in processing equipment comprising: a) 2-30 wt.% of sulfamic acid or a salt thereof, b) up to 10 wt.% of a glycol ether, c) 0.01 to 1.0 wt . % of mercaptobenzotriazole or a salt thereof as corrosion inhibitor, d) optionally an indicator having a pKa 3-4, e) optionally up to 5 wt.% of a buffer, f) 0 to 10 wt.% of a gelling agent, g) 0 to 5 wt . % of a nonionic surfactant, and h) water to complete the composition to 100 wt.%.
  • compositions that is equally effective in various materials and that does not seriously affect the surface of the materials to be treated.
  • Such compositions may also comprise at least one of an indicator, buffer, gelling agent, and nonionic surfactant.
  • Sulfamic acid is used in a quantity of 2-30 wt.%, preferably 10-20 wt.%, and more preferably about 15 wt.%. Sulfamic acid can be used as such, or as a salt such as sodium, potassium, ammonium salt, or HC1 salt.
  • corrosion inhibitors are known in the art and used for removing rust in cleaning compositions, such as mercaptobenzotriazole, phenylacridlne, sodium iodide, thiourea, sulfonated castor oil, arsenic oxide, sodium arsenate, calcium bicarbonate, polyphosphate, calcium hydroxide, sodium silicate, sodium chromate, sodium nitrite, sodium phosphate monobasic, morpholine, sodium phosphate monobasic, polyphosphate, hydrazine, ammonia, octadecylamine, borax, and mixtures thereof.
  • mercaptobenzotriazole preferably ⁇ -mercaptobenzotriazole
  • This corrosion inhibitor can be used in combination with an indicator to monitor the activity of the composition. It was found that only 0.01 to 1.0 wt.% of mercaptobenzotriazole, or a salt thereof such as sodium, potassium or ammonium salt is effective in the present composition. Preferably, 0.05 to 0.5 wt.%, more preferably 0.1 to 0.2 wt.% of mercaptobenzotriazole are used.
  • the ratio sulfamic acid : mercaptobenzotriazole is 30:1 to 3:1, more preferably about 10:1.
  • glycol ethers comprise polyoxyalkylene glycols, polyoxyalkylene-polyamine condensation products and polyoxyalkylene glycol ethers, the polyoxyalkylene groups including ethoxy and/or propoxy groups.
  • Most suitable glycol ethers include diethylene glycol, propylene glycol, and ethylene glycol.
  • an indicator preferably one that has a pKa value between about 3 and 4, and changes from a color to colorless or vice versa .
  • Addition of such indicator enables (automatic) monitoring of the system, visually or spectroscopically. For instance, an indicator changing from colorless to a color when the pH rises above pH 4 shows that the solution running through the equipment needs replenishing with fresh composition of the invention when it is colored.
  • Suitable indicators include but are not restricted to martius yellow, phloxine B, erythrosine B, benzopurpurin 4B, stains-all, methyl yellow, salycylic acid, 2, 4-dinitrophenol, tetrabromophenolphthalein ethyl ester, and bromophenol blue. Methyl yellow proved to be particularly useful.
  • Indicators as usual, are added in very small quantities, such as from 10 "6 to 10 ⁇ 2 wt.% based on the total weight of the composition (about 1 to 10,000 ppm) .
  • the composition may further contain a suitable buffer to keep the pH as constant as possible.
  • Such buffers are well known in the art and comprise for instance oxalate, tartrate, phthalate, phosphate, borax, and calcium hydroxide buffers.
  • Phosphate buffers such as anionic phosphate ester buffers (for instance Triton® H66) are particularly suitable.
  • the composition of the invention usually does not contain more than 5 wt.% of the buffer, usually about 0.1 to 1 wt.%.
  • the composition may further contain a gelling agent.
  • the gelling agent works as a thickener for the composition, which for many applications such as toilet cleaners is an advantage. Up to 10 wt.%, preferably up to 5 wt.% of gelling agent may be present.
  • Suitable gelling agent are known in the art, for instance (bio) polymers, carboxymethylcellulose, starch, polyamide, silicone polyamide, polysaccharide, hydrogel, and the like.
  • the composition may further contain 0 to 5 wt.% of nonionic surfactant, preferably 0.05 to 0.50 wt.%.
  • nonionic surfactants are well known in the art, for instance from ethyleneoxide to a fatty oxyalcohol, particularly with 12 to 18 carbon atoms, More particularly oxyalcohol-ethoxylate containing 2 to 50, preferably 6 to 8 mole of ethyleneoxide per mole of alcohol.
  • nonionic surfactants are (C1-C20) alkylphenols or polypropoxylated or polyglycerolated fatty acids, having a fatty chain comprising, for example, from 8 to 18 carbon atoms, and it being possible for the number of glycerol groups to range in particular from 2 to 30.
  • copolymers of ethylene and propylene oxide condensates of ethylene and propylene oxide with fatty alcohols
  • polyethoxylated fatty amides preferably having from 2 to 30 mol of ethylene oxide, polyglycerolated fatty amides comprising on average 1 to 5 glycerol groups and in particular 1.5 to 4
  • polyethoxylated fatty amines preferably having 2 to 30 mol of ethylene oxide
  • ethoxylated fatty acid esters of sorbitan having from 2 to 30 mol of ethylene oxide
  • fatty acid esters of sucrose fatty acid esters of polyethylene glycol, (C6-C24) aikyl polyglycosides, derivatives of N- (C6-C24) aikyl glucamine, amine oxides such as (C10-C14) alkylamine oxides or N- (C10-C14) acylaminopropylmorpholine oxides; and mixtures thereof.
  • the composition is completed to 100 wt.% by adding water to the composition.
  • the water used may be tap water, but usually demi- (or deionized) water is preferred.
  • the invention further relates to a method for removing and/or preventing scaling of elements in processing equipment having metal elements, comprising the introduction of the hereinbefore mentioned composition to the equipment, bringing the composition in contact with the metal elements of the equipment, and maintaining the contact for a sufficient time to remove or prevent scaling.
  • the method can be used at any suitable temperature at which the composition is fluid.
  • the elements are brought in contact with the composition at a temperature of about 5 to 100° C.
  • the method is preferably performed in a way wherein the step of removing and/or preventing scaling is done without dismantling the equipment. This is one of the main advantages of the present method, since the production process needs no interruption. Further, hardly any residue is formed, and minor quantities of residue are relatively harmless and biodegradable, and can be removed by the normal sewage system.
  • the composition of the invention is continuously or semi-continuously pumped through the equipment, thereby preventing scaling, rust formation, and the like, and simultaneously removing such scaling, rust, that may be formed during the period that the composition was not circulated through the equipment.
  • the composition is particularly suitable for heat exchangers, condensers, vacuum waste systems, oil drill equipments, and piping systems.
  • composition was made with the exception that sulfamic acid was replaced by acetic acid, hydroxy acetic acid, or inhibited mineral acids. None of these compositions were both effective and safe on multi-metals. Further, many of these acids led to considerable gas and/or heat formation.
  • the composition was experimentally used to clean in situ a vacuum toilet system. The system showed a hard scale build-up of 2-3 cm. The composition was pumped around slowly in a closed loop system. After a sequence of 8 hours the hard scale was completely dissolved, without attacking the metals, seals and other materials. No heat or gas was formed.
  • composition according to the invention (A) with regard to its descaling effect is comparable to a sulfamic-benzotriazole composition, but substantially better than a sulfamic acid/tolutriazole composition. Only the combination with corrosive phosphoric acid (see also Example 3) gives better descaling properties.
  • Example 3 The corrosiveness (material loss) of an acideous water based Descaler & Conditioner on mild steel was determined by using compositions with different types of corrosion inhibitors. Thus steel panels were totally immersed into composition A according to the invention and into comparative compositions B-D, after which a weight change measurement and visual qualitative determination of change were performed.
  • Test specimens were made from Carbon Steel (Symbol CklO) having the material specifications: Standard Nr. 1.1121 Din 17210; 1652 ISO 683 T.ll; T.18
  • test solutions were compositions A-D as described in
  • test specimens were immersed in triplo (samples 1-3) according to concentrations of Descaler & Conditioner MR50E with specified inhibitor package.
  • concentrations of Descaler & Conditioner MR50E with specified inhibitor package.
  • the weight of the steel panels was determined after 7 days of total immersion of the panel in the composition. The results are given in Table 2:
  • composition according to the invention (A) is about 40 to 100 times better with regard to its anticorrosive effect compared with compositions B-D (comparative) .
  • Composition B which has a greater descaling effect than composition A (see example 2) is unacceptable for descaling pipelines due to its strong corrosive action.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Environmental & Geological Engineering (AREA)
  • Hydrology & Water Resources (AREA)
  • Water Supply & Treatment (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)
  • Detergent Compositions (AREA)

Abstract

L'invention concerne une composition de détartrage à utiliser dans un équipement de traitement. Cette composition comprend: a) entre 2 et 30 % en poids d'acide sulfamique ou d'un sel de celui-ci, b) jusqu'à 10 % en poids d'un éther glycolique, c) entre 0,01 et 1,0 % en poids de mercaptobenzotriazole ou d'un sel de celui-ci utilisé en tant qu'inhibiteur de corrosion, d) éventuellement un indicateur présentant un pKa 3-4, e) éventuellement jusqu'à 5 % en poids d'un tampon, f) entre 0 et 10 % en poids d'un agent gélifiant, g) entre 0 et 5 % en poids d'un tensioactif non ionique, et h) de l'eau afin compléter la composition jusqu'à 100 % en poids. L'invention concerne en outre un procédé permettant d'éliminer du tartre et/ou d'empêcher la formation de tartre dans un équipement de traitement, de type échangeurs de chaleur, condensateurs, systèmes de traitement de déchets sous vide, équipements de forage pétrolier, et réseaux de tuyauterie.
PCT/EP2004/050134 2003-02-17 2004-02-16 Composition et procede permettant d'eliminer du tartre et/ou d'empecher la formation de tartre dans un equipement de traitement WO2004072327A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP03100356.9 2003-02-17
EP03100356 2003-02-17

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WO2004072327A1 true WO2004072327A1 (fr) 2004-08-26

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2931836A1 (fr) * 2008-06-02 2009-12-04 Victor Seita Decapant nettoyant acide avec indicateur visuel de dosage et temoin de rincage
FR2931711A1 (fr) * 2008-06-02 2009-12-04 Victor Seita Deboucheur de canalisation avec indicateur visuel de temperature et temoin de rincage
CN101871745A (zh) * 2010-06-24 2010-10-27 瓮福（集团）有限责任公司 一种硫酸装置液、液换热器在线清洗的方法
CN105312283A (zh) * 2014-07-16 2016-02-10 上海博世科技发展有限公司 精密设备高温导热油积炭的清洗方法及清洗剂
CN107033986A (zh) * 2017-04-27 2017-08-11 山东英可利化工有限公司 导热油用除积碳剂及清除方法
CN110643439A (zh) * 2019-10-21 2020-01-03 河北冀研能源科学技术研究院有限公司 一种发电机氢气冷却器化学清洗剂及应用
CN113293388A (zh) * 2021-04-30 2021-08-24 泰山学院 酸性清洗剂及其在铁路动客车空调散热片清洗中的应用
WO2023170702A1 (fr) * 2022-03-10 2023-09-14 Hindustan Petroleum Corporation Limited Formulation de détartrage et procédé de dissolution et de nettoyage de dépôt de tartre sur une surface de système
WO2024074005A1 (fr) * 2022-10-08 2024-04-11 广东邦普循环科技有限公司 Agent de dissolution d'incrustations d'acide phosphorique par voie humide, procédé de préparation associé et utilisation correspondante

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2469450A1 (fr) * 1979-11-12 1981-05-22 Solitaire Produits Entretien F Produit de detartrage et de nettoyage en particulier de surfaces en faience emaillee telles que des cuvettes de w.c.
WO1982002379A1 (fr) * 1981-01-12 1982-07-22 Sciences Inc Chemical Composition de nettoyage
AU9151482A (en) * 1981-12-18 1983-06-23 Malcolm Stewart Gilmour Descaling solar hot water systems
US4522738A (en) * 1983-04-26 1985-06-11 Magid David J Toilet bowl cleaner
DD226908A1 (de) * 1984-09-19 1985-09-04 Bitterfeld Chemie Mittel zur entfernung von kesselstein aus industriellen anlagen
US4765921A (en) * 1986-07-03 1988-08-23 Coatex S.A. Acid composition with high concentrations of active materials for the treatment of water and/or cleaning installations containing same

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2469450A1 (fr) * 1979-11-12 1981-05-22 Solitaire Produits Entretien F Produit de detartrage et de nettoyage en particulier de surfaces en faience emaillee telles que des cuvettes de w.c.
WO1982002379A1 (fr) * 1981-01-12 1982-07-22 Sciences Inc Chemical Composition de nettoyage
AU9151482A (en) * 1981-12-18 1983-06-23 Malcolm Stewart Gilmour Descaling solar hot water systems
US4522738A (en) * 1983-04-26 1985-06-11 Magid David J Toilet bowl cleaner
DD226908A1 (de) * 1984-09-19 1985-09-04 Bitterfeld Chemie Mittel zur entfernung von kesselstein aus industriellen anlagen
US4765921A (en) * 1986-07-03 1988-08-23 Coatex S.A. Acid composition with high concentrations of active materials for the treatment of water and/or cleaning installations containing same

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8846594B2 (en) 2008-06-02 2014-09-30 Victor Seita Acid cleaning stripper with visual dosage and rinsing indicator
FR2931711A1 (fr) * 2008-06-02 2009-12-04 Victor Seita Deboucheur de canalisation avec indicateur visuel de temperature et temoin de rincage
EP2130899A1 (fr) * 2008-06-02 2009-12-09 SEITA, Victor Dissolvant nettoyant à l'acide doté d'un indicateur visuel du dosage et du rinçage
EP2130616A1 (fr) * 2008-06-02 2009-12-09 SEITA, Victor Déboucheur de tuyau avec un indicateur visuel de la température et du rinçage
US8273697B2 (en) 2008-06-02 2012-09-25 Victor Seita Pipe unblocker with visual temperature and rinsing indicator
FR2931836A1 (fr) * 2008-06-02 2009-12-04 Victor Seita Decapant nettoyant acide avec indicateur visuel de dosage et temoin de rincage
CN101871745A (zh) * 2010-06-24 2010-10-27 瓮福（集团）有限责任公司 一种硫酸装置液、液换热器在线清洗的方法
CN105312283A (zh) * 2014-07-16 2016-02-10 上海博世科技发展有限公司 精密设备高温导热油积炭的清洗方法及清洗剂
CN107033986A (zh) * 2017-04-27 2017-08-11 山东英可利化工有限公司 导热油用除积碳剂及清除方法
CN110643439A (zh) * 2019-10-21 2020-01-03 河北冀研能源科学技术研究院有限公司 一种发电机氢气冷却器化学清洗剂及应用
CN113293388A (zh) * 2021-04-30 2021-08-24 泰山学院 酸性清洗剂及其在铁路动客车空调散热片清洗中的应用
WO2023170702A1 (fr) * 2022-03-10 2023-09-14 Hindustan Petroleum Corporation Limited Formulation de détartrage et procédé de dissolution et de nettoyage de dépôt de tartre sur une surface de système
WO2024074005A1 (fr) * 2022-10-08 2024-04-11 广东邦普循环科技有限公司 Agent de dissolution d'incrustations d'acide phosphorique par voie humide, procédé de préparation associé et utilisation correspondante

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