Muaj ob txoj hauv kev ntawm kev tsim khoom ntawm caustic soda, causticization method thiab electrolysis method. Causticization txoj kev muab faib ua dej qab zib causticization txoj kev thiab trona causticization txoj kev raws li cov ntaub ntawv sib txawv; Txoj kev electrolysis tuaj yeem muab faib ua diaphragm electrolysis method thiab ion exchange membrane method.
Txoj kev causticization yog muab faib ua dej qab zib causticization txoj kev thiab trona causticization txoj kev raws li raw cov ntaub ntawv sib txawv; Txoj kev electrolysis tuaj yeem muab faib ua diaphragm electrolysis method thiab ion exchange membrane method. Soda causticization method: Soda tshauv thiab txiv qaub yog feem ntau ua rau hauv cov dej qab ntsev thiab cov hmoov tshauv los ua kua txiv qaub. Cov tshuaj tiv thaiv causticization yog nqa tawm ntawm 99-101 degree . caustic dej qab zib. Cov tshuaj concentrated yog ntxiv boiled thiab solidified kom tau ib tug khoom caustic soda khoom.
Cov av nkos causticized yog ntxuav nrog dej, thiab cov dej ntxuav yog siv rau alkalization. Nws Na2CO3 ntxiv rau Ca(OH)2→2NaOH ntxiv rau CaCO3 trona causticization txoj kev trona yog crushed, yaj (los yog alkali brine), clarified, thiab ces ntxiv rau txiv qaub mis nyuj rau causticization ntawm 95-100 degree, thiab cov kua causticized yog clarified. , Evaporate thiab mloog zoo txog li 46 feem pua NaOH concentration, txias cov kua ntshiab, thiab ntxiv boil nws tom qab precipitating ntsev. Cov khoom lag luam caustic soda tau txais. Cov av nkos causticized yog ntxuav nrog dej, uas yog siv los yaj lub trona.
Nws Na2CO3 plus Ca(OH)2 → 2NaOH plus CaCO3↓NaHCO3 plus Ca(OH)2 → NaOH plus CaCO3↓ plus H2O diaphragm electric nkoj txoj kev ntxiv dej qab zib tshauv, caustic soda, barium chloride refined npaj kom tshem tawm calcium thiab magnesium sulfate, thiab lwm yam impurities, tom qab ntawd ntxiv sodium polyacrylate los yog causticized bran rau lub tank kom ceev cov nag lossis daus, ntxiv hydrochloric acid tom qab xuab zeb pom kom tsis txhob ua kom tsis zoo, cov brine yog preheated thiab xa mus rau electrolysis, thiab cov electrolyte yog preheated, evaporated, Desalination thiab txias. kom tau cov kua caustic soda, uas yog ntxiv concentrated kom tau cov khoom caustic soda khoom.
Ntsev av ntxuav dej yog siv los yaj ntsev. Nws 2NaCl ntxiv rau 2H2O [electrolysis] → 2NaOH ntxiv Cl2↑ ntxiv rau H2↑ ion txauv membrane txoj kev, tom qab thawj ntsev yog salted, lub brine yog purified raws li ib txwm txoj kev, thiab cov thawj brine yog lim los ntawm ib tug microporous sintered carbon tubular lim. . Qhov thib ob purification yog ua los ntawm chelating ion pauv resin ntauwd kom txo cov calcium thiab magnesium cov ntsiab lus nyob rau hauv brine kom tsawg dua 0.002 feem pua. Secondary purified brine yog electrolyzed los tsim chlorine nyob rau hauv lub anode chamber, thiab Na ntxiv nyob rau hauv lub brine nyob rau hauv lub anode chamber nkag mus rau hauv lub cathode los ntawm lub ionic membrane. Lub OH nyob rau hauv lub chamber thiab lub cathode chamber generates sodium hydroxide, thiab H ntxiv yog ncaj qha tawm ntawm lub cathode los tsim hydrogen.
Thaum lub sij hawm electrolysis txheej txheem, ib tug tsim nyog tus nqi ntawm high-purity hydrochloric acid yog ntxiv rau lub anode chamber rau neutralize rov qab OH-, thiab cov dej ntshiab yuav tsum tau ntxiv rau lub cathode chamber. Cov concentration ntawm high-purity caustic soda tsim nyob rau hauv lub cathode chamber yog 30 feem pua mus rau 32 feem pua (ntau), uas tuaj yeem siv ncaj qha los ua cov kua dej qab zib, lossis tuaj yeem ua kom boiled ntxiv kom tau cov khoom tiav caustic soda. Nws 2NaCl plus 2H2O → 2NaOH plus H2↑ plus Cl2↑.