PL117201B1 - Boiler scale removal agent - Google Patents
Boiler scale removal agent Download PDFInfo
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- PL117201B1 PL117201B1 PL21215478A PL21215478A PL117201B1 PL 117201 B1 PL117201 B1 PL 117201B1 PL 21215478 A PL21215478 A PL 21215478A PL 21215478 A PL21215478 A PL 21215478A PL 117201 B1 PL117201 B1 PL 117201B1
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- scale removal
- removal agent
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- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
- ing And Chemical Polishing (AREA)
Description
Przedmiotem wynalazku jest srodek do usuwa¬ nia kamienia kotlowego, zwlaszcza z powierzchni zeliwnych.The subject of the invention is an agent for removing limescale, especially from cast iron surfaces.
Stosowane srodki chemiczne do usuwania ka¬ mienia kotlowego stanowia mieszaniny zestawione z kwasu, substancji inhibitujacych korozje che¬ miczna, a takze substancji pasywujacych metal oczyszczony.The chemicals used to remove the boiler scale are mixtures of acid, substances that inhibit chemical corrosion, and also substances that passivate the cleaned metal.
Znany jest z polskiego opisu patentowego nr 39311 srodek zawierajacy kwas solny i siarczan miedzi z dodatkiem koloidu z rodzaju taniny.The agent containing hydrochloric acid and copper sulphate with the addition of a colloid of the tannin type is known from the Polish patent description No. 39311.
Znany jest równiez z polskiego opisu patento¬ wego nr 68703 srodek zawierajacy wagowo 2,0^- 3,4 czesci kwasu fosforowego, 8,0—35,0 czesci 36,3% kwasu solnego 0,2—4,6 czesci szesciometylenoezte- roaminy oraz 58,0—89,6 czesci wody.There is also known from the Polish patent description No. 68703 an agent containing by weight 2.0-3.4 parts of phosphoric acid, 8.0-35.0 parts 36.3% hydrochloric acid 0.2-4.6 parts hexomethylene roamine and 58.0-89.6 parts of water.
Niedogodnoscia znanych srodków jest stosowanie kwasu solnego, stanowiacego rozpuszczalnik metali nieszlachetnych. Uzycie natomiast siarczanu mie¬ dziowego powoduje zgodnie z szeregiem elektro¬ chemicznym metali nadtrawianie powierzchni me¬ tali. Stosowanie zas szesciometylenoczteroaminy jest nieekonomiczne z uwagi na jej stosunkowo wysoka cene.The disadvantage of the known means is the use of hydrochloric acid, which is a solvent for non-noble metals. On the other hand, the use of copper sulphate causes etching of the surface of the metals in accordance with the electrochemical series of metals. The use of hexamethylene tetramine is uneconomical due to its relatively high price.
Celem wynalazku jest opracowanie ekonomiczne¬ go w uzyciu srodka do usuwania kamienia kotlo¬ wego tworzacego na oczyszczonej powierzchni me¬ talu powloke pasywujaca, ulegajaca latwemu usu¬ nieciu przez wyplukanie. 10 15 20 25 W toku badan nieoczekiwanie stwierdzono, ze otrzymanie takiego srodka jest mozliwe przez sko¬ jarzenie w odpowiednich proporcjach: kwasu azo¬ towego, mrówczanu sodowego, fosforanu jednoiso- dowego oraz znanego dwuchromianu potasowego, rozpuszczonych w wodzie.The object of the invention is to provide an economical descaling agent that forms a passivating coating on the cleaned metal surface that can be easily removed by rinsing. In the course of the research it was surprisingly found that it was possible to obtain such an agent by combining in the appropriate proportions: nitric acid, sodium formate, monisodium phosphate and the known potassium dichromate dissolved in water.
Zgodnie z wynalazkiem srodek zestawiony jest z 3,6—7,51% wagowych 68%| kwasu azoto¬ wego, 4,1 — 8,2% wagowych mrówczanu sodowego, 1,4 — 2,5% wagowych fosforanu jednosodowego oraz 0,4 — 0,8% dwuchromianu potasowego, roz¬ puszczonych w 90,5 — 81% wagowych wody.According to the invention, the agent is composed of 3.6-7.51% by weight of 68% Nitric acid, 4.1 - 8.2% by weight of sodium formate, 1.4 - 2.5% by weight of monosodium phosphate and 0.4 - 0.8% of potassium dichromate, dissolved in 90.5 - 81% by weight of water.
Zestaw komponentów wchodzacych w sklad srodka wedlug wynalazku wytwarza ochronna powloke pasywujaca na oczyszczonej powierzchni dzieki obecnosci kwasu fosforowego i dwuchro¬ mianu potasowego. Obecnosc reduktora., jakim jest mrówczan sodowy, hamuje proces utleniania, za¬ pobiegajac tym samym rozpuszczaniu powierzchni metalicznych.The set of components included in the composition according to the invention creates a protective passivating coating on the cleaned surface due to the presence of phosphoric acid and potassium dichromate. The presence of the reducing agent sodium formate inhibits the oxidation process, thus preventing the dissolution of the metallic surfaces.
Srodek wedlug wynalazku wlewa sie lub prze¬ tlacza przez oczyszczony element tak dlugo az przestana wydzielac sie gazy poreakcyjne. W obu przypadkach nalezy zapewnic swobodne odprowa¬ dzenie gazów poreakcyjnych. Proces prowadzi sie w temperaturze pokojowej uzupelniajac ubytek kwasu azotowego tak, aby wartosc pH srodka utrzymywala sie w granicach 0,7 — 2, korzystnie 1 Po rozpuszczeniu kamienia kotlowego element plu¬ cze sie trzykrotnie silnym strumieniem wody ce- 117 201117 201 lem wymycia zanieczyszczen, szlamu oraz czescio¬ wo powloki pasywujacej. Calkowite usuniecie powloki pasywujaicej uzyskuje sie przez 10 minu¬ towe dzialanie 1% kwasem solnym. Nastepnie kwas wylewa sie, a element plucze trzykrotnie woda. .According to the invention, the agent is poured or flushed through the cleaned element until no post-reaction gases are released. In both cases, it is necessary to ensure free discharge of post-reaction gases. The process is carried out at room temperature to make up the loss of nitric acid so that the pH value of the agent remains within the range of 0.7-2, preferably 1. After the limescale dissolves, the element is rinsed three times with a strong stream of water to wash away the impurities, of the sludge and, partially, of the passivating coating. The complete removal of the passivating coating is achieved by a 10-minute treatment with 1% hydrochloric acid. The acid is then poured out and the element is rinsed three times with water. .
Zaleta srodka wedlug wynalazku jest duza sku¬ tecznosc i szybkosc jego dzialania. Dzieki obec¬ nosci powloki paisywujacej uniemozliwiajacej nad_ trawianie metalu, oczyszczony element zachowuje pierwotne wlasciwosci wytrzymalosciowe i anty¬ korozyjne.The advantage of the agent according to the invention is its high efficiency and speed of action. Due to the presence of a passive coating that prevents over-etching of the metal, the cleaned element retains its original strength and anti-corrosion properties.
Szczególowy sklad srodka wedlug wynalazku ilustruje podany przyklad.The detailed composition of the composition according to the invention is illustrated by the following example.
Przyklad. Sklad jakosciowy i ilosciowy srodka: kwas azotawy — mrówczan sodowy — fosforan jedinosodowy — dwuchromian potasowy — woda Razem: 10 15 6.2 czesci wagowych 4.3 czesci wagowych 1.4 czesci wagowych 0,9 czescd wagowych - 87,3 czesci wagowych 100,0 czesci wagowych Zasitrzezenie patentowe Srodek do usuwania kamienia kotlowego zawie¬ rajacy dwuchromian poitasowy, znamienny tym, ze zawiera 3,6—7,5%| wagowych 68% kwa¬ su azotowego, 4,1 — 8,2% wagowych mrówczanu sodowego, 1,4 — 2,5% wagowych fosforanu jedno- sodowego oraz 0,4 — 0,8% wagowych dwuchromia¬ nu potasowego, rozpuszczonych w 90,5 — 81% wa¬ gowychwody. • LZGraf. Z-d 'Nr 2 — 987/82 85+20 egz. A4 Cena 100 zlExample. Qualitative and quantitative composition of the agent: nitrous acid - sodium formate - monosodium phosphate - potassium dichromate - water Total: 10 15 6.2 parts by weight 4.3 parts by weight 1.4 parts by weight 0.9 part by weight - 87.3 parts by weight 100.0 parts by weight. Descaling agent containing potassium dichromate, characterized in that it contains 3.6-7.5% | 68% by weight of nitric acid, 4.1 - 8.2% by weight of sodium formate, 1.4 - 2.5% by weight of monosodium phosphate and 0.4 - 0.8% by weight of potassium dichromate, dissolved in 90.5-81% by weight of water. • LZGraf. Z-d 'No. 2 - 987/82 85 + 20 copies A4 Price PLN 100
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PL21215478A PL117201B1 (en) | 1978-12-23 | 1978-12-23 | Boiler scale removal agent |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PL21215478A PL117201B1 (en) | 1978-12-23 | 1978-12-23 | Boiler scale removal agent |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| PL212154A1 PL212154A1 (en) | 1980-06-16 |
| PL117201B1 true PL117201B1 (en) | 1981-07-31 |
Family
ID=19993522
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PL21215478A PL117201B1 (en) | 1978-12-23 | 1978-12-23 | Boiler scale removal agent |
Country Status (1)
| Country | Link |
|---|---|
| PL (1) | PL117201B1 (en) |
-
1978
- 1978-12-23 PL PL21215478A patent/PL117201B1/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| PL212154A1 (en) | 1980-06-16 |
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