Oxygenates, properties methanol-gasoline

Oxygen was added as oxygenated hydrocarbon components methyl tert-butyl ether (MTBE), tert-amyl methyl ether (TAME), ethyl tert-butyl ether (ETBE), di-isopropyl ether (DIPE), ethanol, methanol, and tertiary butyl alcohol (TBA). The properties of oxygenates, as they relate to gasoline blending, are shown in Table 10-1. 

Methyl tert-butyI ether [1634-04-4] (MTB) is a combustible, clear, colorless liquid with a low viscosity and characteristic, turpentine-like odor. It is miscible with organic solvents, and is only slightly soluble in water. It forms azeotropic mixtures with some solvents such as methanol. MTB does not undergo autoxidation and, in contrast to other ethers, it does not form peroxides with atmospheric oxygen. It improves the antiknock properties when added to motor gasoline. 

CAS 109-46-6 EINECS/ELINCS 203-674-6 Synonyms DBTU 1,3-Dibutyl-2-thiourea 1,3-Di-n-butyl-2-thiourea Di-n-butylthiourea N,N -Dibutylthiourea Empincal C9H20N2S Formula C4H9NHCSNHC4H9 Properties Wh. to It. tan powd. odorless sol. in methanol, ether, acetone, benzene, ethyl acetate, oxygenated soivs. si. sol. in water insol. in gasoline, aliphatic soivs. m.w. 188.34 dens. 1.0 kg/l m.p. 59-69 C... 

Properties Colorless oily liq., odorless, tasteless sol. in ether, gasoline, petrol, ether, benzene, chloroform, hydrocarbon soivs. misc. with veg. and min. oils, org. soivs., lipophilic substances si. sol. in methanol, ethanol, acetone, glac. acetic acid m.w. 422.83 dens. 0.8115 (15/4 C) m.p. -38 C b.p. 350 C acid no. 0.2 max. iodine no. 4 max. sapon. no. 2 max. flash pt. 218 C ref. index 1.4530 (15 C) stable to air and oxygen Toxicology No known toxicity skin irritant TSCA listed... 

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