NO144619B - PROCEDURE AND PREPARATION FOR AA FIGHT AGAINST DISPOSAL BUILDING IN GAS WASHERS - Google Patents

PROCEDURE AND PREPARATION FOR AA FIGHT AGAINST DISPOSAL BUILDING IN GAS WASHERS Download PDF

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NO144619B
NO144619B NO764352A NO764352A NO144619B NO 144619 B NO144619 B NO 144619B NO 764352 A NO764352 A NO 764352A NO 764352 A NO764352 A NO 764352A NO 144619 B NO144619 B NO 144619B
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polymer
preparation
gas
molecular weight
copolymer
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NO144619C (en
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Gerald Elvin Welder
Edward Russell Lang
Charles Wilmer Slagle
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Calgon Corp
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    • 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
    • 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
    • C02F5/145—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 combined with inorganic substances
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/49—Phosphorus-containing compounds

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Chemistry (AREA)
  • Hydrology & Water Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • General Chemical & Material Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Polymers & Plastics (AREA)
  • Inorganic Chemistry (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
  • Treating Waste Gases (AREA)
  • Detergent Compositions (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)

Description

Foreliggende oppfinnelse angår en'fremgangsmåte og et•prepa-rat for å bekjempe avsetningsoppbygning i gassvaskere. The present invention relates to a method and a preparation for combating deposit build-up in gas scrubbers.

I løpet av de siste år har antallet av våtvaskesystemer installert for å fjerne gass- og partikkelformig materiale fra avfallsskorstensgasser øket voldsomt. Ytterligere slike systemer er nu på tegnebordet. Disse våtgassvaskere er blitt anvendt for å klare avløpet fra kjeleskorstener, forbrenningsskorstener, kalkovner, støperier, masovner, basiske oxygenovner (BOF), Siemens-Martin-enheter, koksanlegg, cellulose-gjenvinningskjeler, anlegg for fremstilling av kjæledyrfor, elektriske ovner (stål og aluminium), smelteovner, asfaltanlegg og mange andre. In recent years, the number of wet scrubbing systems installed to remove gaseous and particulate material from waste stack gases has increased dramatically. Further such systems are now on the drawing board. These wet gas scrubbers have been used to clean the effluent from boiler chimneys, incinerators, lime kilns, foundries, blast furnaces, basic oxygen furnaces (BOF), Siemens-Martin units, coking plants, cellulosic recovery boilers, pet food manufacturing plants, electric furnaces (steel and aluminum ), smelters, asphalt plants and many others.

Et av de viktigste trekk ved et gassvaskesystem er kontakt-kammeret, anordningen som anvendes for effektiv overføring av gassformig og/eller partikkelformig materiale fra gassen til vann-fasen. De fleste våtvaskesystemer involverer en venturi, et pakket lag, en hullplate, et dusjkammer eller et turbulent lag. Noen systemer anvender endog to kontaktkammere i serie, f.eks. en venturi fulgt av et dusjkammer. One of the most important features of a gas washing system is the contact chamber, the device used for the efficient transfer of gaseous and/or particulate material from the gas to the water phase. Most wet scrubbing systems involve a venturi, packed bed, perforated plate, shower chamber, or turbulent bed. Some systems even use two contact chambers in series, e.g. a venturi followed by a shower chamber.

Venturi- eller hullplatevaskere er i alminnelighet mere effektive til å fjerne partikkelformig materiale mens pakkede lag, turbulente lag og dusjkammere vanligvis er mere effektive til å fjerne gassformige bestanddeler som SO,, eller HF. Venturi or perforated plate scrubbers are generally more effective at removing particulate matter, while packed beds, turbulent beds, and shower chambers are generally more effective at removing gaseous constituents such as SO,, or HF.

Foreliggende oppfinnelse angår spesielt de gassvaskesystemer hvor skall- og avsetningsproblemer på grunn av uoppløse-lig calciumcarbonat , calciumf luorid, jernoxyd (Fe^^) » silicium-oxyd, manganoxyd, jernmalrastøv og slaggstøv foreligger. Det problem som foreliggende oppfinnelse reduserer, er det som foreligger i gassvaskesystemer for masovnoperasjoner hvor jernmalm overføres eller bearbeides til jern med et høyt carboninnhold. The present invention relates in particular to gas washing systems where scale and deposition problems due to insoluble calcium carbonate, calcium fluoride, iron oxide (Fe^^) » silicon oxide, manganese oxide, iron mill dust and slag dust are present. The problem that the present invention reduces is that which exists in gas washing systems for mass operations where iron ore is transferred or processed into iron with a high carbon content.

For å sikre en fullstendig forståelse av problemet som foreliggende oppfinnelse angår, gies i det følgende en kort beskrivelse av en masovnoperasjon. In order to ensure a complete understanding of the problem to which the present invention relates, a brief description of a mass operation is given below.

Ved fremstilling av jern mates jernmalm sammen med andre bestanddeler som dolomit inn gjennom toppen av en masovn som fyres med koks. En luftstrøm blåses oppad fra bunnen av ovnen gjennom de senere smeltede materialer. Carbonet fra koksen reduserer jernmalmen (^ Fe^ O^) til metallisk jern. Det smeltede jern tappes fra bunnen av ovnen mens slaggen tappes fra midten av ovnen. Biproduktet fra carbonreduksjonen er selvsagt en kombinasjon av carbondioxyd og carbonmonoxyd som reagerer med det tilstedeværende calcium under dannelse av den brysomme skalldanner, calciumcarbonat og andre faste stoffer som leire, slagg, støv, etc. In the production of iron, iron ore is fed together with other components such as dolomite through the top of a blast furnace that is fired with coke. An air stream is blown upwards from the bottom of the furnace through the later melted materials. The carbon from the coke reduces the iron ore (^ Fe^ O^) to metallic iron. The molten iron is drained from the bottom of the furnace while the slag is drained from the center of the furnace. The by-product from the carbon reduction is of course a combination of carbon dioxide and carbon monoxide which reacts with the calcium present to form the troublesome scale former, calcium carbonate and other solid substances such as clay, slag, dust, etc.

Som det vil forståes, bidrar luftstrømmen som blåses oppad, betraktelig til forurensningsinnholdet av avgassen, og legger så-ledes en stor byrde på vaskesystemet. Det partikkelformige innhold i vaskemediet varierer fra 1.000 til 2.000 ppm på grunn av part ikke1innholdet i skorstensgassen. As will be understood, the air flow which is blown upwards contributes considerably to the pollution content of the exhaust gas, and thus places a great burden on the washing system. The particulate content in the washing medium varies from 1,000 to 2,000 ppm due to the particulate content in the flue gas.

Vaskerne som anvendes for rensning av masovngass, er ofte av venturikonstruksjonen og behandler avgassene fra ovnen. Disse gasser inneholder betraktelige mengder jernoxyd, hvis fine par-tikkelstørrelse tillater den å medføres av gasstrømmen. Dessuten kan koksstøv være tilstede i mindre grad og i noen grad partikkelformig slaggmateriale som anvendes som silikater og ubrukt dolomit. Jernoxydet har vært utsatt for høye temperaturer i ovnen og kan derfor være i en sintret form med lav overflateaktivitet. Dets fine partikkelstørrelse forårsaker imidlertid avsetningsproblemer i vaskerne og utførselsledningene. The scrubbers used to clean blast furnace gas are often of the venturi design and process the exhaust gases from the furnace. These gases contain considerable amounts of iron oxide, whose fine particle size allows it to be entrained by the gas stream. In addition, coke dust may be present to a lesser extent and to some extent particulate slag material which is used as silicates and unused dolomite. The iron oxide has been exposed to high temperatures in the furnace and may therefore be in a sintered form with low surface activity. However, its fine particle size causes deposition problems in the scrubbers and discharge lines.

Et annet eksempel på et operativt system er en basisk oxygenovn (BOF) hvori ovnen mottar smeltet metall fra masovnen foruten skrap, forskjellige legeringer for å oppfylle spesifikasjonene, Another example of an operational system is a basic oxygen furnace (BOF) in which the furnace receives molten metal from the blast furnace in addition to scrap, various alloys to meet specifications,

og kalk og flusspat som flussmiddel. Oxygen innføres gjennom en lanse for å fjerne forurensninger. Oxygenblesten kan frigjøre 4,4 tonn støv pr. 220 tonn sats. Dette støv må gjenvinnes fra-utløpsgassen. Støvet består av jernoxyd, kalk og fluorid. and lime and fluorspar as a flux. Oxygen is introduced through a lance to remove contaminants. The oxygen blast can release 4.4 tonnes of dust per 220 ton rate. This dust must be recovered from the exhaust gas. The dust consists of iron oxide, lime and fluoride.

Disse partikkelholdige og oppløselige gasser fjernes fra avgassen i en våt gassvasker. I vaskevannet forenes jernoxydet, calciumfluoridet og calciumcarbonatet til å bevirke stor avsetningsoppbygning på vaskesystemveggene, hvilket fører til ineffektiv vaskeoperasjon og høye vedlikeholdsomkostninger. These particulate and soluble gases are removed from the exhaust gas in a wet gas scrubber. In the washing water, the iron oxide, calcium fluoride and calcium carbonate combine to cause a large build-up of deposits on the washing system walls, which leads to inefficient washing operations and high maintenance costs.

Ved tidligere kjente metoder som metoden angitt i U.S. patent 3.880.620, anvendes skallavsetningsinhibitorer, dvs. uorganiske og organiske fosfater; og lavmolekylære polymere dispersjons-midler. Denne løsning har ikke vært helt vellykket til å forhindre avsetning og har ført til økede behandlingsomkostninger og hyppige nedstengninger for mekanisk rengjøring. In previously known methods such as the method set forth in U.S. patent 3,880,620, shell deposition inhibitors are used, i.e. inorganic and organic phosphates; and low molecular weight polymeric dispersants. This solution has not been entirely successful in preventing deposition and has led to increased treatment costs and frequent shutdowns for mechanical cleaning.

Det er følgelig et mål ved foreliggende oppfinnelse å frem-skaffe en fremgangsmåte og et preparat for effektivt å forhindre avsetning i gassvaskere, og som er økonomiske og nedsetter til et minimum hyppigheten av mekanisk rengjøring av gassvaskeutstyr, og som er effektive over et bredt pH-område. It is therefore an aim of the present invention to provide a method and a preparation for effectively preventing deposits in gas scrubbers, which are economical and reduce to a minimum the frequency of mechanical cleaning of gas scrubber equipment, and which are effective over a wide pH range area.

Disse og andre mål ved foreliggende oppfinnelse oppnåes ved fremgangsmåten og preparatet ifølge oppfinnelsen hvori fra 0,01 til 100 ppm aktive bestanddeler, fortrinnsvis fra 0,1 til 10 ppm aktive bestanddeler, av'et preparat omfattende en skallinhibitor og en høymolekylær polymer opprettholdes i det vandige vaskemedium. Forholdet av høymolekylær polymer til skallinhibitor kan være fra 1:10 til 10:1, fortrinnsvis fra 1:5 til 5:1,.i vekt. These and other objectives of the present invention are achieved by the method and the preparation according to the invention in which from 0.01 to 100 ppm active ingredients, preferably from 0.1 to 10 ppm active ingredients, of a preparation comprising a shell inhibitor and a high molecular weight polymer is maintained in the aqueous washing medium. The ratio of high molecular polymer to shell inhibitor can be from 1:10 to 10:1, preferably from 1:5 to 5:1, by weight.

Passende terskel-skallinhibitorer omfatter fosfonater med den generelle formel: hvor R er Suitable threshold-shell inhibitors include phosphonates of the general formula: where R is

M er H, NH^, alkalimetall eller kombinasjoner derav; M is H, NH 3 , alkali metal or combinations thereof;

n er 0 til 6; og n is 0 to 6; and

x er 1 til 6; x is 1 to 6;

eller med den generelle formel: or with the general formula:

hvor X er -0H eller -NH^ og R er en alkylgruppe med 1-5 carbonatomer, og/eller polyforfat, f.eks. natriumpolyfosfater eller fosfatestere, med formelen: where X is -OH or -NH^ and R is an alkyl group with 1-5 carbon atoms, and/or polyforfat, e.g. sodium polyphosphates or phosphate esters, with the formula:

hvor M er H, NH^ eller et énverdig metallion, og R er en alkylengruppe med 1-18 carbonatomer. Passende polyfosfater er angitt i US patenter 2.337.856, 2.906.599 og 3.213.017. De fore-trukne forbindelser er imidlertid amino-tris-(methylenfosfonsyre) og hydroxyethyliden-l,l-difosfonsyre (HEDP) og vannoppløselige salter derav. where M is H, NH^ or a monovalent metal ion, and R is an alkylene group with 1-18 carbon atoms. Suitable polyphosphates are disclosed in US Patents 2,337,856, 2,906,599 and 3,213,017. However, the preferred compounds are amino-tris-(methylenephosphonic acid) and hydroxyethylidene-1,1-diphosphonic acid (HEDP) and water-soluble salts thereof.

Passende høymolekylære polymerer omfatter en hvilken som helst ikke-ionisk eller anionisk yannoppløselig polymer med en molekylyekt på minst 100.000, og fortrinnsvis minst 1.000.000. Eksempler på passende polymerer omfatter polyacrylamider som dem som er angitt i U .S. patent 3-085.916, polymerer av 2-acrylamido-methyl-propan-sulfonsyre som dem som er angitt i U.S. patent 3.709.816, og sulfonerte polystyrener som dem som er angitt i U.S. patent 3-630.937. Suitable high molecular weight polymers include any nonionic or anionic water soluble polymer with a molecular weight of at least 100,000, and preferably at least 1,000,000. Examples of suitable polymers include polyacrylamides such as those disclosed in U .S. patent 3-085,916, polymers of 2-acrylamido-methyl-propane-sulfonic acid such as those disclosed in U.S. Pat. patent 3,709,816, and sulfonated polystyrenes such as those disclosed in U.S. Pat. patent 3-630,937.

Oppfinnelsen belyses ytterligere av følgende eksempler: The invention is further illustrated by the following examples:

Eksempel 1 Example 1

10 ppm av et preparat inneholdende en høymolekylær copolymer av 2-acrylamido-methyl-propan-sulfonsyre og acrylamid og en skallinhibitor [amino-tris-(methylenfosfonat)] i et vektforhold på 1:2,5 ble opprettholdt i vanntilførselen til gassvaskesystemet til en basisk oxygenovn i 13 uker på hvilket tidspunkt systemet ble inspisert visuelt og ingen synlig avsetning kunne iakttaes i pumpene, ventilene eller dusjene. Dette står i motsetning til 10 ppm of a preparation containing a high molecular weight copolymer of 2-acrylamido-methyl-propane-sulfonic acid and acrylamide and a shell inhibitor [amino-tris-(methylenephosphonate)] in a weight ratio of 1:2.5 was maintained in the water supply to the gas scrubbing system for a basic oxygen furnace for 13 weeks at which time the system was visually inspected and no visible deposits could be observed in the pumps, valves or showers. This is in contrast to

, sterk forurensning av pumper, dusjer og ventiler som førte til tap av gassvaske- og kjøleeffektivitet, og derpå bevirket midler- , heavy contamination of pumps, showers and valves which led to a loss of gas scrubbing and cooling efficiency, and subsequently caused means-

tidig produksjonstap, som forekom i en to-ukers periode uten behandling. Tidligere var dette system sterkt forurenset med calciumcarbonat og inneholdt betraktelige mengder ferrioxyd. early production loss, which occurred during a two-week period without treatment. Previously, this system was heavily contaminated with calcium carbonate and contained considerable amounts of ferric oxide.

Eksempel 2 Example 2

6,6 ppm av et preparat inneholdende en høymolekylær copolymer av 2-acrylamido-methyl-propan-sulfonsyre og acrylamid og en skallinhibitor [amino-tris-(methylenfosfonat)] i et vektforhold på 1:2,5 ble opprettholdt i vanntilførselen til kjølesystemet til en basisk oxygenovn og venturivaskesystemet som hadde en sterk oppbygning av calciumfluorid, jernoxyd og calciumcarbonat. Efter 1.600 oppvarmninger ble systemet inspisert, og gassled-ningene, avløpsrister og dyser viste seg å være rene. 6.6 ppm of a preparation containing a high molecular weight copolymer of 2-acrylamido-methyl-propane-sulfonic acid and acrylamide and a shell inhibitor [amino-tris-(methylenephosphonate)] in a weight ratio of 1:2.5 was maintained in the water supply to the cooling system to a basic oxygen furnace and the venturi washing system which had a strong build-up of calcium fluoride, iron oxide and calcium carbonate. After 1,600 heatings, the system was inspected, and the gas lines, drain grates and nozzles were found to be clean.

Eksempel 3 Example 3

15 ppm av et preparat inneholdende en høymolekylær copolymer av 2-acrylamido-methyl-propan-sulfonsyre og acrylamid og en skallinhibitor [amino-tris-(methylenfosfonat)] i et vektforhold på 1:2,5 ble opprettholdt i vanntilførselen til gassvaskesystemet til en masovn med store jernavsetninger, som tidligere hadde ført til et øket topptrykk i ovnen, hvilket førte til produksjonstap i ovnen og nedstengning for skallrensning innen en uke når ét lavmolekylaert (1.000) polyacrylat og amino-tris-(methylénfosf onat) ble anvendt. Efter 6 ukers behandling med de høymolekylær polymer-skallinhibitorpreparater ifølge oppfinnelsen, ble ingen trykkøkning eller oppbygning iakttatt, og systemet arbeidet, normalt. 15 ppm of a preparation containing a high molecular weight copolymer of 2-acrylamido-methyl-propane-sulfonic acid and acrylamide and a shell inhibitor [amino-tris-(methylenephosphonate)] in a weight ratio of 1:2.5 was maintained in the water supply to the gas scrubbing system for a blast furnace with large iron deposits, which had previously led to an increased top pressure in the furnace, which led to production loss in the furnace and shutdown for shell cleaning within a week when one low molecular weight (1,000) polyacrylate and amino-tris-(methylene phosphonate) was used. After 6 weeks of treatment with the high-molecular polymer shell inhibitor preparations according to the invention, no pressure increase or build-up was observed, and the system worked normally.

Eksempel 4 Example 4

For å simulere betingelser i et gassvaskesystem ble der fremstilt et syntetisk vann som hadde en pH på 12,0, en konsentrasjon av suspendert faststoff, (hydratisert ferrioxyd) på 2.000 mg/l, en konsentrasjon av natriumhydroxyd på 200 mg/l, en konsentrasjon av natriumbicarbonat på 26o mg/l, en calciumkonsentrasjon på In order to simulate conditions in a gas washing system, a synthetic water was produced which had a pH of 12.0, a concentration of suspended solids, (hydrated ferric oxide) of 2,000 mg/l, a concentration of sodium hydroxide of 200 mg/l, a concentration of of sodium bicarbonate of 26o mg/l, a calcium concentration of

450 mg/l og' en fluoridkonsentrasjon på 40 mg/l. Vannet ble holdt på en temperatur på 6ot2°C og sirkulert gjennom forsøkssystemet med en lineær hastighet mellom 90 og 120 cm/sek. Forsøkssystemet inneholdt en uoppvarmet forsøksdel (30 cm lang), en oppvarmet del (30 cm lang), en dusjedel og en avrenningsdel. Inhibitoren ble tilsatt til det syntetiske vann som så ble sirkulert gjennom systemet i 5 timer, hvorefter systemet ble nedstengt og forsøks- 450 mg/l and a fluoride concentration of 40 mg/l. The water was maintained at a temperature of 6ot2°C and circulated through the test system at a linear velocity between 90 and 120 cm/sec. The test system contained an unheated test part (30 cm long), a heated part (30 cm long), a shower part and a drainage part. The inhibitor was added to the synthetic water which was then circulated through the system for 5 hours, after which the system was shut down and experimental

delene veiet og den prosentvise inhibering ble beregnet i henhold til følgende formel: the parts weighed and the percentage inhibition were calculated according to the following formula:

Resultatene av disse forsøk er angitt i tabell I. The results of these experiments are set out in Table I.

Produktbetegnelser Product designations

"Calgon" natriumhexametafosfat "Calgon" sodium hexametaphosphate

AMP amino-t ris-(methylen-fosfonsyre) AMP amino-tris-(methylene-phosphonic acid)

HEDP 1-hydroxyethyliden-1,1-difosfonsyre HEDP 1-hydroxyethylidene-1,1-diphosphonic acid

Polymer 1 49/51 copolymer av acrylamid og 2-acrylamido-2-methyl-propan-l-sulfonsyre med en molekylvekt på ca. 1.000.000 Polymer 1 49/51 copolymer of acrylamide and 2-acrylamido-2-methyl-propane-1-sulfonic acid with a molecular weight of approx. 1,000,000

Polymer 2 homopolymer av 2-acrylamido-2-methyl-propan-l-sulfonsyre med en molekylvekt på ca. 500.000 Polymer 3 høymolekylær uhydrolysert polyacrylamid med en Polymer 2 homopolymer of 2-acrylamido-2-methyl-propane-1-sulfonic acid with a molecular weight of approx. 500,000 Polymer 3 high molecular unhydrolyzed polyacrylamide with a

molekylvekt på ca. 1.0OO.000 molecular weight of approx. 1,000,000

Polymer 4 høymolekylærc fhydrolysert (15%) polyacrylamid med en molekyl velet på ca. 1.000.000 Polymer 4 high molecular hydrolyzed (15%) polyacrylamide with a molecular weight of approx. 1,000,000

Polymer 5 sulfonert polystyren med en molekylvekt på ca. Polymer 5 sulphonated polystyrene with a molecular weight of approx.

700.000 700,000

Claims (2)

1. Fremgangsmåte for å bekjempe avsetningsoppbygning i gassvaskere med et vandig vaskemedium ved anvendelse av minst 0,01 ppm av et preparat inneholdende en polymer valgt fra polyacrylamid og/eller en copolymer av acrylamid og 2-acrylamido-methyl-propansulfonsyre eller et vannoppløselig salt derav, og en skallinhibitor omfattende fosfonat med den generelle formel: hvor R er M er H, NH^> alkalimetall eller kombinasjoner derav; n er O til 6; og X er 1 til 6; eller med den generelle formel: hvor X er -OH eller -NH7>og R"*" er en alkylgruppe med 1-5 carbonatomer, og/eller polyfosfat med formelen: hvor m er H, Nt^ eller et énverdig metallion, og R 2 er en alkylengruppe med 1-18 carbonatomer, i et forhold av polymer til skallinhibitor fra 1:10 til 10:1, karakterisert ved at den anvendte polymer/ -copolymer har en molekylvekt på minst 100.000.1. Process for combating deposit build-up in gas scrubbers with an aqueous scrubbing medium using at least 0.01 ppm of a preparation containing a polymer selected from polyacrylamide and/or a copolymer of acrylamide and 2-acrylamido-methyl-propanesulfonic acid or a water-soluble salt thereof , and a shell inhibitor comprising a phosphonate of the general formula: where R is M is H, NH 4 > alkali metal or combinations thereof; n is 0 to 6; and X is 1 to 6; or with the general formula: where X is -OH or -NH7> and R"*" is an alkyl group with 1-5 carbon atoms, and/or polyphosphate with the formula: where m is H, Nt^ or a monovalent metal ion, and R 2 is an alkylene group with 1-18 carbon atoms, in a ratio of polymer to shell inhibitor from 1:10 to 10:1, characterized in that the polymer/copolymer used has a molecular weight of at least 100,000. 2. Preparat for å bekjempe avsetningsoppbygning i gassvaskere med et vandig vaskemedium, som inneholder en polymer valgt fra polyacrylamid og/eller en copolymer av acrylamid og 2-acrylamido-methyl-propansulfonsyre, eller et vannoppløselig salt derav, og en skallinhibitor omfattende fosfonat med den generelle formel: hvor R er M er H, NH^, alkalimetall eller kombinasjoner derav; n er 0 til 6; og x er 1 til 6; eller med den generelle formel: hvor X er OH eller NH9?og R1 er en alkylgruppe med 1-5 carbonatomer, og/eller polyfosfat med formelen: hvor M er H, NI^ eller et énverdlg metallion, og R er en alkylengruppe med 1-18 carbonatomer, i et forhold av polymer til skallinhibitor fra 1:10 til 10:1, karakterisert ved at polymeren /copolymer en har en molekylvekt på minst 100.00.2. Preparation for combating deposit build-up in gas scrubbers with an aqueous scrubbing medium, containing a polymer selected from polyacrylamide and/or a copolymer of acrylamide and 2-acrylamido-methyl-propanesulfonic acid, or a water-soluble salt thereof, and a shell inhibitor comprising phosphonate with the general formula: where R is M is H, NH 3 , alkali metal or combinations thereof; n is 0 to 6; and x is 1 to 6; or with the general formula: where X is OH or NH9?and R1 is an alkyl group with 1-5 carbon atoms, and/or polyphosphate with the formula: where M is H, NI^ or a monovalent metal ion, and R is an alkylene group with 1-18 carbon atoms, in a ratio of polymer to shell inhibitor from 1:10 to 10:1, characterized in that the polymer/copolymer has a molecular weight of at least 100.00.
NO764352A 1976-01-07 1976-12-23 PROCEDURE AND PREPARATION FOR AA FIGHT AGAINST DISPOSAL BUILDING IN GAS WASHERS NO144619C (en)

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NL185221B (en) 1989-09-18
DE2700347C2 (en) 1989-12-28
CA1087480A (en) 1980-10-14
FR2337694A1 (en) 1977-08-05
DK566776A (en) 1977-07-08
IE44558B1 (en) 1982-01-13
SE435456B (en) 1984-10-01
NL185221C (en) 1990-02-16
IT1121700B (en) 1986-04-10
DE2700347A1 (en) 1977-07-14
DK153367C (en) 1989-01-02
CH624368A5 (en) 1981-07-31
IE44558L (en) 1977-07-07
NL7614213A (en) 1977-07-11
FR2337694B1 (en) 1981-12-24
NO764352L (en) 1977-07-08
LU76525A1 (en) 1977-07-15
BR7608838A (en) 1977-10-25
JPS52110288A (en) 1977-09-16
SE7614102L (en) 1977-07-08
FI763638A (en) 1977-07-08
GB1532391A (en) 1978-11-15
NO144619C (en) 1981-10-07

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