Terc-Butil-etil-éter

terc-Butil-etil-éter[1]
IUPAC-név 2-etoxi-2-metilpropán
Kémiai azonosítók
Rövidítés ETBE
CAS-szám 637-92-3
PubChem 12512
ChemSpider 11996
EINECS-szám 211-309-7
RTECS szám KN4730200
SMILES
CCOC(C)(C)C
InChI
1/C6H14O/c1-5-7-6(2,3)4/h5H2,1-4H3
Kémiai és fizikai tulajdonságok
Kémiai képlet C6H14O
Moláris tömeg 102,18
Megjelenés színtelen, átlátszó folyadék
Sűrűség 0,7364 g/cm³
Olvadáspont −94 °C
Forráspont 69-71 °C
Oldhatóság (vízben) 1,2 g/100 g
Gőznyomás 173 mbar (25 °C)[2]
Veszélyek
EU osztályozás Tűzveszélyes (F)
Irritatív (Xi)[2]
R mondatok R11, R36/38[2]
S mondatok S16, S26[2]
Lobbanáspont -19 °C
LD50 > 2000 mg/kg (nyúl, bőrön keresztül)[2]
Ha másként nem jelöljük, az adatok az anyag standardállapotára (100 kPa) és 25 °C-os hőmérsékletre vonatkoznak.

A terc-butil-etil-éter (ETBE) egy oxigéntartalmú üzemanyag-adalék, melyet leginkább a benzin nyersolajból történő előállításakor használnak. Az ETBE minőségi tulajdonságai ugyanolyanok vagy jobbak, mint az etanolé, szállítása azonban kevesebb kihívással jár. Az etanoltól eltérően az ETBE nem növeli a benzin párolgását – ami a szmog egyik okozója –, és nem köti meg a légkör nedvességtartalmát.

Előállítása

ETBE-t etanol és izobutilén keverékének katalizátor fölött, melegítés hatására lejátszódó reakciójával állítanak elő.

A fermentációval és desztillációval előállított etanol sokkal drágább mint a metanol, mely a földgázból állítható elő. Így a metanolból előállított MTBE olcsóbb, mint az etanol alapú ETBE.

Jegyzetek

  1. ↑ Merck Index, 11th Edition, 3732.
  2. ↑ a b c d e Az etil-tercier-butil-éter vegyülethez tartozó bejegyzés az IFA GESTIS adatbázisából. A hozzáférés dátuma: 2011. 01. 29. (JavaScript szükséges) (angolul)

Fordítás

  • Ez a szócikk részben vagy egészben az Ethyl tert-butyl ether című angol Wikipédia-szócikk fordításán alapul. Az eredeti cikk szerkesztőit annak laptörténete sorolja fel. Ez a jelzés csupán a megfogalmazás eredetét és a szerzői jogokat jelzi, nem szolgál a cikkben szereplő információk forrásmegjelöléseként.

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