Ethylene Diamine Tetraacetic Acid Disodium (EDTA Na2)
Katundu: Ethylene Diamine Tetraacetic Acid Disodium (EDTA Na2)
CAS#: 6381-92-6
Fomula: C10H14N2O8Na2.2H2O
Kulemera kwa maselo: 372
Kapangidwe ka Chilinganizo:
Ntchito: Imagwiritsidwa ntchito pa sopo wothira utoto, chothandizira kupangira ulusi, chowonjezera chokongoletsera, chowonjezera chakudya, feteleza waulimi ndi zina zotero.
Mafotokozedwe:
| Chinthu | Muyezo |
| Maonekedwe | Ufa Woyera |
| Kuyesa (C)10H14N2O8Na2.2H2O) | ≥99.0% |
| Plumbum(Pb) | ≤0.0005% |
| Ferrum(Fe) | ≤0.001% |
| Kloridi (Cl) | ≤0.05% |
| Sulfate (SO3)4) | ≤0.05% |
| PH(50g/L; 25℃) | 4.0-6.0 |
| Kukula kwa Tinthu | ＜40mesh≥98.0% |
Ntchito:
EDTA 2NA ndi chinthu chofunikira kwambiri chopangira zinthu zosakaniza zitsulo ndi kulekanitsa zitsulo. Chinthuchi chimagwiritsidwa ntchito ngati njira yothetsera kuyera utoto popanga ndi kukonza zinthu zojambulidwa ndi utoto, komanso kupaka utoto wothandizira, wothandizira kuchiza ulusi, chowonjezera kukongola, mankhwala, chakudya, kupanga feteleza waulimi, mankhwala oletsa magazi, chothandizira kuuma, chotsukira, chokhazikika, mphira wopangidwa, choyambitsa polymerization ndi chothandizira kusanthula kuchuluka kwa zitsulo zolemera, ndi zina zotero. Mu dongosolo loyambitsa kuchepetsedwa kwa chlorinated la polymerization ya SBR, disodium EDTA imagwiritsidwa ntchito ngati gawo la chinthu chogwira ntchito, makamaka popangira zinthu zosakaniza zitsulo ndikuwongolera kuchuluka kwa momwe polymerization imagwirira ntchito.
Njira Yopangira:
1. Pang'onopang'ono onjezani chisakanizo cha sodium cyanide ndi formaldehyde mu yankho lamadzi la ethylenediamine mu chiŵerengero china, ndikutulutsa mpweya pa 85℃ pansi pa kupsinjika kochepa kuti muchotse mpweya wa ammonia. Pambuyo pa yankho, sinthani mtengo wa Ph kukhala 4.5 ndi sulfuric acid yokhazikika, kenako sinthani mtundu, sefani, sungani, sakanizani ndikulekanitsa, ndikuumitsa kuti mupeze chinthu chomalizidwa.
2. Sakanizani 100kg ya chloroacetic acid, 100kg ya ayezi ndi 135kg ya yankho la 30% NaOH, onjezerani 18kg ya 83% ~ 84% ethylenediamine mukamasakaniza, ndikuyisunga pa 15℃ kwa ola limodzi. Pang'onopang'ono onjezani yankho la 30% NaOH m'magulu mpaka reactant itakhala ya alkaline, ndikuyisunga kutentha kwa chipinda kwa maola 12. Tenthetsani mpaka 90℃, onjezerani mpweya woyatsidwa kuti usinthe mtundu. Filtrate imasinthidwa kukhala 4.5 Ph ndi hydrochloric acid ndikuyiyika mu 90℃; filtrate imaziziritsidwa, kupangidwa kukhala makristalo, kulekanitsidwa ndikutsukidwa, ndikuumitsidwa pa 70℃ kuti mupeze chinthu chomalizidwa.
3. Yopangidwa ndi ntchito ya ethylenediaminetetraacetic acid ndi sodium hydroxide solution: Mu botolo la reaction la 2L lokhala ndi stirrer, onjezerani 292g ya ethylenediaminetetraacetic acid ndi madzi a 1.2L. Onjezani 200mL ya 30% sodium hydroxide solution pansi pa kusakaniza ndi kutentha mpaka zonse zitatha. Onjezani 20% hydrochloric acid ndikuchepetsa pH=4.5, kutentha mpaka 90℃ ndikusakaniza, fyuluta. Filtrate imaziziritsidwa ndipo makhiristo amathiridwa. Tulutsani ndikulekanitsa, sambitsani ndi madzi osungunuka, owumitsa pa 70℃, ndikupeza mankhwala a EDTA 2NA.
4. Onjezani ethylenediaminetetraacetic acid ndi madzi mu thanki yoyatsira enamel, onjezerani sodium hydroxide solution pansi pa kusakaniza, tenthetsani mpaka zonse zitayamba, onjezerani hydrochloric acid ku pH 4.5, tenthetsani mpaka 90°C ndikusakaniza, sefani, filtrate yazizidwa, sefani makhiristo, sambitsani ndi madzi, aumitseni pa 70°C, ndipo pezani EDTA 2NA.
