Ethylene Diamine Tetraacetic Acid Disodium (EDTA Na2)
Khoom Muag: Ethylene Diamine Tetraacetic Acid Disodium (EDTA Na2)
CAS Nr .: 6381-92-6
Formula: C10H14N2O8Na2.2 H2O
Molecular Luj: 372
Cov qauv qauv:
Siv: Siv tau rau xab npum, dyeing adjuvant, ua tus neeg sawv cev rau fibers, cosmetic additive, zaub mov additive, ua liaj ua teb chiv thiab lwm yam.
Specifications:
| Yam khoom | Txuj |
| Qhov tshwm sim | Dawb hmoov |
| Assay (C10H14N2O8Na2.2 H2O) | ≥99.0% |
| Plumbum(Pb) | ≤ 0.0005% |
| Ferrum (Fe) | ≤ 0.001% |
| Chloride (Cl) | ≤ 0.05% |
| Sulfate (SO4) | ≤ 0.05% |
| PH (50g / L; 25 ℃) | 4.0-6.0 |
| Particle Loj | 40 mesh ≥98.0% |
Daim ntawv thov:
EDTA 2NA yog ib qho tseem ceeb complexing neeg sawv cev rau complexing hlau ions thiab sib cais hlau. Cov khoom no yog siv los ua bleaching fixing tov rau xim photographic khoom tsim thiab ua, thiab dyeing auxiliary, fiber kho tus neeg saib xyuas, tshuaj pleev ib ce additive, tshuaj, khoom noj khoom haus, ua liaj ua teb tshuaj microfertilizer ntau lawm, ntshav anticoagulant, complexing tus neeg saib xyuas, detergent, stabilizer, hluavtaws roj hmab, polymerization pib thiab hnyav hlau quantitative tsom xam cov txheej txheem BR. disodium EDTA yog siv los ua ib feem ntawm tus neeg sawv cev ua haujlwm, feem ntau yog rau kev sib xyaw hlau ions thiab tswj tus nqi ntawm cov tshuaj tiv thaiv polymerization.
Txheej txheem ntau lawm:
1. Maj mam ntxiv cov sib tov ntawm sodium cyanide thiab formaldehyde rau cov kua dej ntawm ethylenediamine nyob rau hauv ib qho piv txwv, thiab dhau ntawm huab cua ntawm 85 ℃ nyob rau hauv lub siab txo kom tshem tawm cov roj ammonia. Tom qab cov tshuaj tiv thaiv, kho tus nqi Ph rau 4.5 nrog concentrated sulfuric acid, thiab tom qab ntawd decolorize, lim, mloog zoo, crystallize thiab cais, thiab qhuav kom tau cov khoom tiav.
2. Sib tov 100kg ntawm chloroacetic acid, 100kg ntawm dej khov thiab 135kg ntawm 30% NaOH tov, ntxiv 18kg ntawm 83% ~ 84% ethylenediamine nyob rau hauv stirring, thiab khaws cia ntawm 15 ℃ rau 1h. Maj mam ntxiv 30% NaOH tov rau hauv cov khoom siv kom txog thaum cov reactant ua alkaline, thiab khaws cia hauv chav sov li 12 teev. Thaum tshav kub kub rau 90 ℃, ntxiv cov pa roj carbon activated kom decolorize. Cov lim dej yog hloov kho rau 4.5 Ph nrog hydrochloric acid thiab concentrated thiab lim ntawm 90 ℃; cov filtrate yog txias, crystallized, sib cais thiab ntxuav, thiab qhuav ntawm 70 ℃ kom tau cov khoom tiav.
3.Ua los ntawm kev ua ntawm ethylenediaminetetraacetic acid thiab sodium hydroxide tov: Hauv 2L cov tshuaj tiv thaiv lub raj mis nruab nrog lub stirrer, ntxiv 292g ethylenediaminetetraacetic acid thiab 1.2L dej. Ntxiv 200mL ntawm 30% sodium hydroxide tov nyob rau hauv nplawm thiab kub kom txog thaum tag nrho cov tshuaj tiv thaiv tiav. Ntxiv 20% hydrochloric acid thiab neutralize rau pH = 4.5, cua sov rau 90 ℃ thiab mloog zoo, lim. Cov filtrate yog txias thiab crystals yog precipitated. Extract thiab cais, ntxuav nrog dej distilled, qhuav ntawm 70 ℃, thiab tau txais cov khoom EDTA 2NA.
4.Ntxiv ethylenediaminetetraacetic acid thiab dej rau lub enameled cov tshuaj tiv thaiv tank, ntxiv sodium hydroxide tov nyob rau hauv stirring, tshav kub kom txog rau thaum tag nrho cov tshuaj tiv thaiv, ntxiv hydrochloric acid rau pH 4.5, cua sov rau 90 ° C thiab mloog zoo, lim, lub filtrate txias, lim tawm cov muaju, ntxuav nrog dej, qhuav ntawm 70 ° C, thiab tau txais NA.
