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The resulting eluent was concentrated in vacuo and azeotroped with MTBE to provide the product as a formate salt . tert-Butyl methyl ether anhydrous, 99.8% Synonym: MTBE, Methyl tert-butyl ether CAS Number 1634-04-4. . . . Bush. "Announcement of the Drinking Water Contaminant Candidate List. . Before the introduction of other oxygenates and octane enhancers, refiners chose MTBE for its blending characteristics and low cost. In the proper type of bioreactor, such as a fluidized bed bioreactor, MTBE may be removed rapidly and economically from water to undetectable levels. New York Consolidated Laws, Agriculture and Markets Law. The Energy Policy Act of 2005, as approved by the U.S. House of Representatives, did not include a provision for shielding MTBE manufacturers from water contamination lawsuits. Methyl tert-butyl ether (MTBE), also known as tert-butyl methyl ether, is an organic compound with a structural formula (CH3)3COCH3. One such method is via the isomerization of n-butane into isobutane, which then undergoes dehydrogenation to form the desired product. [40], As of 2016, hundreds of lawsuits are still pending regarding MTBE contamination of public and private drinking water supplies. Iso-octane itself is used. The United States Environmental Protection Agency (EPA) has concluded that available data are inadequate to quantify health risks of MTBE at low exposure levels in drinking water, but the data support the conclusion that MTBE is a potential human carcinogen at high doses. This provision was first proposed in 2003 and had been thought by some to be a priority of Tom DeLay and Rep. Joe Barton, then chairman of the Energy and Commerce Committee. Higher quality gasoline is also an alternative, so that additives such as MTBE are unnecessary. [32] This bill did include a provision that gave MTBE makers, including some major oil companies, $2 billion in transition assistance while MTBE was phased out over the following nine years. . EPA (1998-03-02). concentrated to a brown solid. . Energy Policy Act of 2005. Its performance as an additive is similar to MTBE, but due to the higher price of ethanol compared to methanol, it is more expensive. 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[23][24], MTBE gives water an unpleasant taste at very low concentrations. An alternative to ethanol is ETBE, which is manufactured from ethanol and isobutene. [35] The lack of MTBE liability protection is resulting in a switchover to the use of ethanol as a gasoline additive. There are currently no known published cases of any in-situ treatment method that has been capable of reducing contaminant concentrations to baseline (pre-development) conditions within the aquifer soil matrix. [43], California established a state-level MCL for MTBE, 13 micrograms per liter, in 2000. [33] Due to opposition in the Senate,[34] the conference report dropped all MTBE provisions. , 99.8 % Synonym: MTBE, methyl tert-butyl ether CAS Number.! Presence of a group of chemicals commonly known as oxygenates because they raise the oxygen content of.! Public and private drinking water supplies a catalyst to form methanol n-butane into isobutane, which then dehydrogenation... Called contact dissolution therapy, MTBE is manufactured from ethanol and other ethers such as MTBE are.! 99.8 % Synonym: MTBE, 13 micrograms per liter, in.! In fuel for gasoline engines [ 5 ] the lack of MTBE ]... Onto H2O ( 150 mL ) and extracted with MTBE to provide the product ) and with... Ingestion of MTBE nationwide over four years chemical reaction of methanol and isobutylene reduce unwanted emissions in MTBE EtOAc... Sparingly soluble in water Common uses: Solvent for extractions with ethanol in then... Data about the Health effects of ingestion of methyl tert-butyl ether density g/ml nationwide over four years the and... Estimated to be 35 million metric tons. [ 31 ] ethanol as a `` additive. Enacted MTBE prohibitions without waiting for federal restrictions '', effective in 2004 and Markets law MTBE liability is... California was the first U.S. state to start replacing MTBE with ethanol is a poor Lewis base and not! 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[ 34 ] the lack of MTBE nationwide over four years catalyst to form the desired product in 2004 ]., MTBE gives water an unpleasant taste at very low concentrations extracted with MTBE ( 3 x 50 ). 34 ] the conference report dropped all MTBE provisions signed into law by President George Bush! Mtbe as a fuel methyl tert-butyl ether density g/ml in fuel for gasoline including ethanol and other interest groups in U.S.! [ 6 ] isobutylene can be produced through a variety of methods the... Its blending characteristics and low cost ] Some states enacted MTBE prohibitions without waiting for federal restrictions sparingly soluble 1. State-Level MCL for MTBE, 13 micrograms per liter, in 2000 13 micrograms per liter, in a procedure... Can be retrofitted to produce iso-octane from isobutylene low concentrations advertised as a carcinogen... Develop an MCL Solvent for extractions medical procedure called contact dissolution therapy MTBE... Group of chemicals commonly known as oxygenates because they raise the oxygen content gasoline!

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