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butyl ethyl ether
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Ethyl t-butyl ether (ETBE) 2-ethoxy-2-methylpropane) is an alternative to MTBE as an oxygenate to enhance the octane rating of petrol. It is used mainly in Europe, particularly in France. This accounts for over 90% of the world's annual production of ca 3 million tonnes.
The direct and selective synthesis of phenols from aryl/heteroaryl halides and KOH has been achieved through the use of highly active monophosphine-based catalysts derived from Pd2dba3 and ligands L1 or L2 and the biphasic solvent system 1,4-dioxane/H2O. We have also demonstrated a one-pot method of phenol formation/alkylation for the preparation of alkyl aryl ethers from aryl halides. In many instances, this protocol overcomes limitations in existing Pd-catalyzed coupling reactions of aliphatic alcohols with aryl halides. Finally, we demonstrate that substituted benzofurans can be prepared efficiently via a Pd-catalyzed phenol formation/cyclization protocol starting from 2-chloroaryl alkynes.
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Methyl t-butyl ether (2-methoxy-2-methylpropane), often referred to as simply MTBE, has been widely used over the last 30 years to improve the burning characteristics of petrol.
A further way to improve the octane rating is to add an oxygenated compound. The favoured compounds are alcohols (methanol and ehanol) and one of three ethers MTBE (methyl t-butyl ether), ETBE (ethyl t-butyl ether), TAME (t-amyl methyl ether).
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An increasing amount of ETBE (ethyl t-butyl ether) is used in Europe, particularly in France (see below). Another ether, TAME (t-amyl methyl ether) is also used in the US and Europe.
Methyl t-butyl ether, MTBE, is widely used as the oxygenated additive to improve the characeristics of petrol. and its production grew over 20 years from almost zero to about 16 million tonnes a year in 2002. There has now been a dramatic turnaround in the US, Canada, Japan and in Europe. It was found that even very small amounts of MTBE can contaminate drinking water. Any seepage from storage tanks in petrol stations, which is not uncommon, leads to damage to the water course, This is because MTBE is much more soluble in water than petrol and any MTBE in the ground, is carried by rainwater through the soil, whereas petrol that leaks remains close to the tank.
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continuously contacting said t-butanol and methanol in a molar amount of about 0.1 to 10 moles of methanol per mole of t-butanol with said catalyst at a temperature of about 20 DEG C to about 250 DEG C and a pressure of about atmospheric to about 1000 psig to obtain the methyl-tert-butyl product.
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It is a substitute for HAP (Hazardous Air Pollutant) solvents, VOCs (volatile organic compounds: acetaldehyde, benzene, 1,3-butadiene, ethylbenzene, formaldehyde, toluene, xylenes, and particulate organic matter), chlorinated solvents and other ozone depleters as well as esters and ethers in a short supply.
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t-Amyl methyl ether (TAME) (2-methoxy-2-methylbutane) is another alternative to MTBE. It is made from two alkenes, 2-methylbut-1-ene and 2-methylbut-2-ene produced during the various refinery processes to make petrol, including .
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