CS242271B1 - Corrosion inhibiting agent for steel, honey and its alloys with dispersing-sequestering effect and with partial nitrification inhibition for cooling circuits - Google Patents

Corrosion inhibiting agent for steel, honey and its alloys with dispersing-sequestering effect and with partial nitrification inhibition for cooling circuits Download PDF

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CS242271B1
CS242271B1 CS845187A CS518784A CS242271B1 CS 242271 B1 CS242271 B1 CS 242271B1 CS 845187 A CS845187 A CS 845187A CS 518784 A CS518784 A CS 518784A CS 242271 B1 CS242271 B1 CS 242271B1
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steel
weight
corrosion
alloys
dispersing
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CS845187A
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Slovak (sk)
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CS518784A1 (en
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Klement Maly
Olga Vinklerova
Walter Waradzin
Jozef Praznovsky
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Klement Maly
Olga Vinklerova
Walter Waradzin
Jozef Praznovsky
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Publication of CS242271B1 publication Critical patent/CS242271B1/en

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Abstract

Vynález patří do odboru ochrany kovov proti korózii a rieši protikoróznu ochranu ocelových a ostatných kovov v teplovýmenných systémoch s vodným chladiacim mé- diom. Korozně inhibičný prostriedok na ocel’, med a jej zliatiny s dispergačným, sekvestračným účinkom a s čiastočnou inhibíciou nitrifikácie pre chladiace okruhy obsahuje 20 až 70 % hmot. dvojzložkovej dispergač- nej látky, obsahujúcej 70 až 95 % hmot. polyetoxylovaného propylénglykoléteru a 5 až 30 % hmot. alkylpolyglykolesterfosfátu, 10 až 40 % hmot. 2-merkaptobenztriazolu, 0,1 až 10 % hmot. 1,2,3-benztriazolu, 3 až 30 % hmot. organického rozpúšťadla N,N-dimetylformamidu, 20 až 50 % hmot. tripolyfosfátu sodného a 10 až 25 % hmot. hydroxidu sodného. Korozně inhibičný prostriedok na ocel', med' a jej zliatiny s dispergačným, sekvestračným účinkom a s čiastočnou inhibíciou nitrifikácie pódia vynálezu sa kontinuálně udržuje vo vodných teplovýmenných mé- diach o koncentrácii 10 až 50 g na m3.The invention belongs to the field of metal corrosion protection and addresses the corrosion protection of steel and other metals in heat exchange systems with an aqueous cooling medium. A corrosion inhibitor for steel, copper and its alloys with a dispersing, sequestering effect and with partial inhibition of nitrification for cooling circuits contains 20 to 70% by weight of a two-component dispersant, containing 70 to 95% by weight of polyethoxylated propylene glycol ether and 5 to 30% by weight of alkyl polyglycol ester phosphate, 10 to 40% by weight of 2-mercaptobenzotriazole, 0.1 to 10% by weight of 1,2,3-benzotriazole, 3 to 30% by weight of the organic solvent N,N-dimethylformamide, 20 to 50% by weight of sodium tripolyphosphate and 10 to 25% by weight of sodium hydroxide. The corrosion inhibitor for steel, copper and its alloys with dispersing, sequestering effect and partial inhibition of nitrification of the invention is continuously maintained in aqueous heat exchange media at a concentration of 10 to 50 g per m3.

Description

242271242271

Vynález sa týká prostriedku s korozně in-hibičným, dispergačným a sekvestračnýmúčinkom pre teplovýmenné prostredie oce-lových systémov s měděnými a mosadznýmimateriálmi v cirkulačných chladiacich okru-hoch všeobecne a zvlášť pre okruhy obsa-hujúce zvýšená hladinu dusičňanovýchiónov přítomných v důsledku prebiehajúcejnitrifikácie v cirkulačně] vodě, ktorú záro-veň čiastočne inhibuje. Působením vodného teplovýmenného pro-stredia v chladiacich systémoch dochádzaku korózii ocele a taktiež ostatných ušlach-tilých kovov používaných v cirkulačnom o-kruhu, ktorá je výrazné zvyšovaná vyskyt-nuvšou sa nitrifikáciou v okruhu, t. j. bio-logickou oxidáciou absorbovaného čpavkuv cirkulačně] vodě přítomnými autotrofný-mi nitrifikačnými baktériami až na dusič-nany.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composition for corrosion inhibiting, dispersing and sequestering activity in a heat exchange environment of steel systems with copper and brass materials in circulating cooling circuits in general, and in particular to circuits comprising elevated nitrate levels present due to circulating water in the circulation. which at the same time partially inhibits. By the action of an aqueous heat exchange medium in the cooling systems, the corrosion of the steel and also of the other noble metals used in the circulating O-ring, which is greatly increased by the occurrence of nitrification in the circuit, ie by the bio-oxidation of the absorbed ammonia by the circulating water present in the autotrophic nitrifying bacteria down to nitrates.

Korózia vo všeobecnosti v chladiacich o-kruhoch prebieha rovnoměrně, ale vplyvtvorby usadenia nerozpustných látok akonapříklad nerozpustné soli, hlavně uhliči-tan vápenatý, prach, hlína, piesok, korozněsplodiny a biomasa sposobujú koróziu ne-rovnoměrného charakteru najčistejšie tzv.]amkovú koróziu. Ďalšou zložkou, ktorá najviac ovplyvňujezvyšovanie celkovej korózie, ale hlavně jam-kové] v systéme u uvedených kovov, alehlavně u médi a je] zliatin je zvýšená hla-dina dusičňanových iónov.Corrosion generally occurs uniformly in the cooling rings, but the effect of the formation of insoluble matter deposits and, for example, the insoluble salt, especially calcium carbonate, dust, clay, sand, corrosion and biomass, causes corrosion of the uneven nature of the purest so-called amorphous corrosion. Another component that most influences the increase in overall corrosion, but above all, of the wells in the system of these metals, and in the media and alloys, is the increased level of nitrate ions.

Aby sa zabránilo konkrétnému napadaniuvodných teplovýmenných systémov pozostá-vajácich z ocele, médi a jej zliatin, pridá-vajá sa do chladiacich vůd inhibitory koró-zie. Sá to známe doteraz používané klasickéinhibitory korózie ocelí na báze — kremiči-tanov, tanínov, fosforečňanov, zinočnatýchsolí, dusitanov, chromanov a molybdenov.Corrosion inhibitors are added to the cooling conduit in order to prevent specific attack on the water heat exchange systems consisting of steel, medium and alloys. We know the conventional corrosion inhibitors of the silicates, tannins, phosphates, zinc salts, nitrites, chromates and molybdens used so far.

Tieto inhibitory sá schopné v róznej mie-re potlačit' koróziu ocele, ale neinhibujákoróziu médi a jej zliatin.These inhibitors are capable of suppressing the corrosion of the steel in a mixed manner, but do not inhibit the corrosion of the medium and its alloys.

Mnohé z uvedených koróznych inhibíto-rov korózie sá i zdravotně a ekologicky zá-vadné, mapr. dusitany, chromeny.Many of the corrosion inhibitors mentioned are corrosion-resistant, mapr. nitrites, chromenes.

Neinhibujá zanášanie systému usadenina-mi pokial' sa nepoužívajá dispergačné či-nidlá ako sá napr. polyakryláty, alebo ko-polyméry na báze etylénoxidu a propylén-oxidu a iné.It does not inhibit clogging of the system by the sedimentation of dispersants such as polyacrylates or co-polymers based on ethylene oxide and propylene oxide and others.

Nepósobia dostatočne sekvestračne, alebovůbec sekvestračné áčinky na zabezpečeniepatřičného stupňa stabilizácie tvrdosti chla-diacej vody im chýbajá.They do not cause sufficiently sequestering, or even sequestering, coctails to provide a proper degree of stabilization of the chilled water hardness.

Nedostatky uvádzaného stavu v cirkulač-ných chladiacich systémoch i za přítomnostimierne zvýšenej hladiny dusičňanovýchiónov rieši navrhovaný korozně inhibičnýprostriedok na ocel', med a jej zliatiny sdispergačným, sekvestračným účinkom a sčiastočnou inhibíciou nitrifikácie pre chla-diace okruhy podlá vynálezu, ktorý pozo-stáva z 20 až 70 % hmot. dvojzložkovej dis-pergačnej látky, obsahujúcej 70 až 95 % hmot. polyetoxylovaného propylénglykol-éteru, podlá všeobecného vzorcaThe drawbacks of the state of the art in circulating cooling systems, even in the presence of a moderately elevated nitrate level, are solved by the proposed corrosion inhibiting agent for steel, honey and its alloys by dispersing, sequestering and partially inhibiting nitrification for cooling circuits according to the invention, which consists of 20 to. 70 wt. a two component dispersant containing 70 to 95 wt. polyethoxylated propylene glycol ether according to the formula

H (CzHdOjm (CsHeOjn (C2H4O)p OH kde m + p = 4 až 10, pričom symboly m,p sú rovnaké, alebo rožne celé čísla, n je4 až 12 a z 5 až 30 % hmot. alkylpolygly-kolesterfosfátu všeobecného vzorcaH (C 2 H 10 O 6 (C 5 H 6 O 2 n (C 2 H 4 O) p OH) wherein m + p = 4 to 10, wherein the symbols m, p are the same or rooted, n is 4 to 12 and 5 to 30% by weight of the alkyl polyglycol ester phosphate of the formula

OO

IIII

Rl— (OC2H4 )x—O—P—O—Z OMe kdeR 1 - (OC 2 H 4) x —O — P — O — Z OMe where

Me je alkalický kov alebo amin s po-čtom x atómov uhlíka 1 až 6, s výhodoutrietanolamínu, Z je buď zhodné s Me, alebo představujeradikál — (C2H4O jy—Rz, R,, R2 sú buď zhodné ,alebo různé a pred-stavujú alkyl alebo alkylfenol so 6 až 20atómami uhlíka, s výhodou nonylfenolu, x, y sú bud zhodné, alebo různé celé číslav rozmedzí 1 až 8, z 10 až 40 % hmot. 2-merkaptobenztriazo-lu, z 0,1 až 10 % hmot. 1,2,3-benztriazolupraktického, z 3 až 30 % hmot. organického rozpúš-ťadla N,N-dimetylformamidu, z 20 až 50 °/o hmot. tripolyíosíátu sodné-ho, z 10 až 25 % hmot. alkalizačného pro-striedku — najvýhodnejšie hydroxid sodný.Me is an alkali metal or amine having a carbon atom number of 1 to 6, preferably triethanolamine, Z is either identical to Me, or is a radical of - (C 2 H 4 O 2 -R 2, R 1, R 2 are both identical or different and represent alkyl or alkylphenol having from 6 to 20 carbon atoms, preferably nonylphenol, x, y are either identical or different integers ranging from 1 to 8, from 10 to 40% by weight of 2-mercaptobenzotriazole, from 0.1 to 10% by weight 1,2,3-benztriazolupractic, from 3 to 30% by weight of an organic solvent of N, N-dimethylformamide, from 20 to 50% by weight of sodium tripolyphosphate, from 10 to 25% by weight of alkalizing agent most preferably sodium hydroxide.

Uvádzaný prostriedok sa přidává do vod-ného teplovýmenného média v koncentrá-cii 10 až 50 g . m-3.The composition is added to the aqueous heat transfer medium in a concentration of 10 to 50 g. m-3.

Možno ho aplikovat aj oddelene, t. j. jehodispergačnodetergenčnú časť podlá potřebymožno dávkovat na exponovanom mieste vsystéme najvačšieho zanášania usadeninamia jeho inhibičnú zložku na počiatku výtla-ku. V obidvoch prípadoch ho třeba dávko-vat kontinuálně.It can also be applied separately, i.e. the dispersing-detergent portion can be dispensed at the exposed site in the fastest clogging system with its inhibitory component at the beginning of the discharge. In both cases, it should be dosed continuously.

Tento prostriedok je schopný potlačitrovnoměrná (plošná) a taktiež nerovnoměr-ná (jamková) koróziu ocele, médi a jejzliatin i v případe přítomnosti zvýšenej hla-diny dusičňanových iónov. Prostriedok ob-sahuje špecifickú zložku, ktorá chrání vozvýšenej miere ocel', med a mosadz voči du-sičňanom vo vodnom teplovýmennom pro-středí a taktiež čiastočne inhibuje oxidáciučpavku, čím napomáhá udržovat nižší stu-peň nitrifikácie. Ďalej svojim účinkom zabraňuje sedimen-tární častíc nerozpustných látok, ktoré sa dosystému dostali zvonka vrátane přítomnýchv okruhu, t. j. biomasy, koróznych splodínatď.This composition is capable of suppressing uniform (as well as non-uniform) well corrosion of steel, media and alloys even in the presence of increased levels of nitrate ions. The composition contains a specific component that protects the elevated level of steel, honey and brass from the nitrate in the aqueous heat exchange medium and also partially inhibits the oxidation of ammonia, thereby helping to maintain a lower degree of nitrification. Furthermore, by its effect it prevents the sedimentary particles of insoluble substances which have reached the outside, including those present in the circuit, i.e. the biomass, from corrosive particles.

Prostriedok obsahuje chelatačnú zložku,The composition contains a chelating agent,

Claims (2)

PREDMETSUBJECT 1. Korozně inhibičný prostriedok na ocel, med a jej zliatiny s dispergačno-sekvestračným účinkom a s čiastočnou inhibíciou nitrifikácie pre chladiace okruhy vyznačuje sa tým, že obsahuje 20 až 70 % hmot. dvojzložkovej dispergačnej látky, obsahujúcej 70 až 95 % hmot. polyetoxylovaného propylénglykoléteru a 5 až 30 °/o hmot. alkylpolyglykolesteríosfátu, 10 až 40 % hmot.What is claimed is: 1. A corrosion-inhibiting agent for steel, honey and its alloys having a dispersing-sequestering effect and a partial nitrification inhibition for cooling circuits, characterized in that it contains 20 to 70 wt. % of a two-component dispersant containing 70 to 95 wt. % of polyethoxylated propylene glycol ether and 5 to 30 wt. % alkyl polyglycol ester phosphate, 10 to 40 wt. kylpolyglykoléterfosfátu, 20 kg hydroxidu sodného znížila koróziu ocele o 85 % a znížila tvorbu usadením vznikajúcich z nečistot a soli vápnika 90 %.kylpolyglycol ether phosphate, 20 kg of sodium hydroxide reduced the corrosion of steel by 85% and reduced the formation of deposits resulting from impurities and calcium salt by 90%. Příklad 2Example 2 Úprava 8 000 m3 vodného cirkulačného chladiaceho média v ocelových systémoch (obsahujúceho med' a jej zliatiny) aplikáciou 40 kg 2-merkaptobenztriazolu, 32 kg tripolyfosforečňanu sodného, 80 kg dvojzložkovej dispergačnej látky obsahujúcej 70 až 95 % hmot. polyetoxylovaného propylénglykoléteru a 5 až 30 % hmot. alkylpolyglykoléterfosfátu, 4 kg 1,2,3-benztriazolu, 24 kg Ν,Ν-dimetylformamidu a 16 kg hydroxidu sodného, znížila koróziu ocele o 88 percenta a znížila tvorbu usadením vznikajúcich z nečistot a solí vápnika o 90 °/o.Treatment of 8,000 m 3 of aqueous circulating coolant in steel systems (containing copper and its alloys) by application of 40 kg of 2-mercaptobenzotriazole, 32 kg of sodium tripolyphosphate, 80 kg of a two-component dispersant containing 70 to 95 wt. % polyethoxylated propylene glycol ether and 5 to 30 wt. alkylpolyglycol ether phosphate, 4 kg of 1,2,3-benztriazole, 24 kg of Ν, Ν-dimethylformamide and 16 kg of sodium hydroxide, reduced steel corrosion by 88 percent and reduced the build-up of impurities and calcium salts by 90%. Vynález je určený pre použitie ocelových systémov vodných teplovýmenných prostrediach v chemickom, potravinárskom, farmaceutickom, hutnom priemysle, ale hlavně v energetike.The invention is intended for the use of steel systems in aqueous heat exchange environments in the chemical, food, pharmaceutical, metallurgical industries, but mainly in power engineering. VYNÁLEZUINVENTION 2-merkaptobenztriazolu, 20 až 50 % hmot, tripolyfosfátu sodného a 10 až 25 % hmot. hydroxidu sodného.% Of 2-mercaptobenzotriazole, 20 to 50 wt.%, Sodium tripolyphosphate and 10 to 25 wt. sodium hydroxide. 2. Korozně inhibičný prostriedok podfa bodu 1, vyznačený tým, že ďalej obsahuje 0,1 až 10 % hmot. 1,2,2-benztriazolu a 3 až 30 % hmot. organického rozpúšťadla N,N-dimetylformámidu.2. The corrosion-inhibiting composition of claim 1, further comprising from about 0.1% to about 10% by weight. % Of 1,2,2-benztriazole and 3 to 30 wt. an organic solvent of N, N-dimethylformamide.
CS845187A 1984-07-04 1984-07-04 Corrosion inhibiting agent for steel, honey and its alloys with dispersing-sequestering effect and with partial nitrification inhibition for cooling circuits CS242271B1 (en)

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