Methyl-tert-butyl ether (MTBE) 99,5+%

MTBE (according to IUPAC nomenclature: 2-methoxy-2-methylpropane, also written as methyl tert-butyl ether) is an organic chemical compound from the group of aliphatic ethers. On the one hand, it has acquired a certain industrial importance due to its use as an additive in gasoline and on the other hand as a solvent in organic chemistry.

Usage:

MTBE is mainly added to gasoline as an anti-knock agent. It increases the octane number and reduces the tendency of the gasoline engine to knock. It replaces tetraethyl lead in unleaded fuels.

It is also contained in starting aid sprays, which are sprayed into the combustion engine's intake tract in the event of starting problems.

MTBE is increasingly used in organic chemistry as a solvent and extractant. It replaces ethers such as diethyl ether or tetrahydrofuran, as MTBE has very little to no tendency to form peroxides through autoxidation. This is due to the fact that peroxide cannot be formed on the -carbon atom on the tert-butyl side (because it does not carry a hydrogen atom as the tertiary carbon atom) and the formation of peroxide on the methyl group would have to occur mechanically via a very unstable methyl radical.

environmental sustainability
The environmental compatibility of MTBE is discussed, especially with regard to groundwater. In the US, drinking water was contaminated by tank leaks. The mixture has therefore been banned in several US states and has been replaced there by tert-amyl methyl ether (TAME). In Europe, for example, it is considered minor, as double-walled underground tanks are usually used at service stations. The intense scent allows MTBE to be detected in small traces.

Safety instructions and risk assessment

Due to its high flammability, tert-butyl methyl ether should always be used in a fume hood. The skin should be protected from splashes by wearing an apron and suitable protective gloves. When filling larger quantities, it is advisable to take precautions against electrostatic charging (use of cans and funnels that are earthed).

If inhaled: Remove affected person to fresh air immediately. The fumes can cause headaches, drowsiness, and even fainting.
In case of skin contact: wash off with plenty of soap and water. Intense skin contact can cause the same symptoms as inhalation.
In case of eye contact: rinse thoroughly with water (eye wash). consult a doctor.
If swallowed: rinse mouth with plenty of water. consult a doctor.

Technical information:

TBME, 2-Methyl-2-methoxypropane, Methyl tert-butyl ether, MTBE
Empirical formula C5H12O
Molar mass (M) 88.14 g/mol
Density (D) 0.74 g/cm³
Boiling point (bp) 55.3 °C
Flash point (flp) -28 °C
Melting point (mp) -108.6 °C
ADR 3 II
WCS 1
CAS no. [1634-04-4]
EC-No. 216-653-1
UN No. 2398

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