Soda ea Caustic(NaOH) ke e 'ngoe ea lihlahisoa tsa bohlokoa ka ho fetisisa tsa lik'hemik'hale tsa phepo ea lik'hemik'hale, tse nang le tlhahiso ea selemo le selemo ea 106t.NaOH e sebelisoa ka k'hemistri ea lintho tse phelang, ha ho etsoa aluminium, indastering ea pampiri, indastering ea lijo, ha ho etsoa li-detergents, joalo-joalo Soda ea Caustic ke motsoako oa tlhahiso ea chlorine, 97% ea eona e nkang. sebaka ka electrolysis ea sodium chloride.
Soda ea Caustic e na le tšusumetso e matla ho lisebelisoa tse ngata tsa tšepe, haholo-holo ka mocheso o phahameng le ho tsepamisa mohopolo.Leha ho le joalo, e 'nile ea tsejoa ka nako e telele hore nickel e bontša khanyetso e ntle ea ho senya ho soda caustic ka linako tsohle le mocheso, joalo ka ha setšoantšo sa 1 se bontša.Ho feta moo, ntle le maemong a holimo haholo le lithempereichara, nickel ha e na khatello ea maikutlo e bakoang ke caustic-corrosion cracking.Ka hona, litekanyetso tse tloaelehileng tsa nickel alloy 200 (EN 2.4066 / UNS N02200) le alloy 201 (EN 2.4068 / UNS N02201) li sebelisoa methating ena ea tlhahiso ea soda ea caustic, e hlokang khanyetso e phahameng ka ho fetisisa ea kutu.Li-cathodes tse ka seleng ea electrolysis e sebelisoang ts'ebetsong ea lera li entsoe ka maqephe a nickel hape.Likarolo tse tlase tsa metsi bakeng sa ho tsepamisa joala ho tsona li entsoe ka nickel.Li sebetsa ho ea ka methati e mengata ea mouoane haholo-holo ka lievaporator tsa lifilimi tse oelang.Likarolong tsena nickel e sebelisoa ka mokhoa oa li-tubes kapa li-tube sheets bakeng sa li-exchangers tsa mocheso pele ho moea, e le maqephe kapa lipoleiti tse koahetsoeng bakeng sa likarolo tsa pele ho moea oa mouoane, le liphaephe tsa ho tsamaisa tharollo ea soda ea caustic.Ho itšetlehile ka sekhahla sa phallo, likristale tsa soda (supersaturated solution) li ka baka khoholeho ea mobu holim'a li-tubes tsa mocheso oa mocheso, e leng se etsang hore ho hlokahale hore ho nkeloe sebaka ka mor'a nako ea ho sebetsa ea lilemo tse 2-5.Ts'ebetso ea evaporator ea filimi e oelang e sebelisoa ho hlahisa soda e matla haholo, e nang le anhydrous caustic soda.Ts'ebetsong ea filimi e oelang e ntlafalitsoeng ke Bertrams, letsoai le qhibilihisitsoeng mochesong o ka bang 400 ° C le sebelisoa e le sesebelisoa sa ho futhumatsa.Mona li-tubes tse entsoeng ka carbon nickel alloy 201 (EN 2.4068/UNS N02201) li lokela ho sebelisoa hobane mocheso o phahameng ho feta hoo e ka bang 315 °C (600 °F) ho na le carbon content ea standard nickel grade alloy 200 (EN 2.4066 / UNS N02200) ) e ka lebisa ho pula ea graphite meeling ea lijo-thollo.
Nickel ke thepa e ratoang ea kaho bakeng sa li-evaporator tsa caustic soda moo litšepe tsa austenitic li ke keng tsa sebelisoa.Boteng ba litšila tse kang klorate kapa metsoako ea sebabole - kapa ha ho hlokahala matla a phahameng - lisebelisoa tse nang le chromium tse kang alloy 600 L (EN 2.4817 / UNS N06600) li sebelisoa maemong a mang.Hape se khahlang haholo bakeng sa tikoloho ea caustic ke chromium e phahameng e nang le alloy 33 (EN 1.4591/UNS R20033).Haeba lisebelisoa tsena li tla sebelisoa, ho tlameha ho netefatsoe hore maemo a ts'ebetso ha a na monyetla oa ho baka khatello ea maikutlo-ho phatloha ho hoholo.
Alloy 33 (EN 1.4591/UNS R20033) e bonts'a khanyetso e ntle ea kutu ho 25 le 50% NaOH ho fihlela moo ho belang le ho 70% NaOH ho 170 °C.Alloy ena e boetse e bonts'a ts'ebetso e ntle haholo litekong tsa masimong semeleng se pepeselitsoeng ho caustic soda ho tsoa ts'ebetsong ea diaphragm.39 Setšoantšo sa 21 se bonts'a liphetho tse ling mabapi le bongata ba joala ba diaphragm caustic, bo neng bo silafalitsoe ke chloride le chlorate.Ho fihlela ho motsoako oa 45% NaOH, lisebelisoa tsa alloy 33 (EN 1.4591 / UNS R20033) le nickel alloy 201 (EN 2.4068 / UNS N2201) li bontša khanyetso e ikhethang e bapisoang.Ka ho eketseha ha mocheso le motsoako oa mahloriso 33 e fetoha e hanyetsanang le ho feta nickel.Kahoo, ka lebaka la motsoako oa eona o phahameng oa chromium 33 o bonahala o le molemo ho sebetsana le litharollo tsa caustic ka chloride le hypochlorite ho tloha diaphragm kapa mercury cell process.
Nako ea poso: Dec-21-2022