Uses of MTBE

Is MTBE also a component of chemical weapons or something like that?

It increases the octane rating of gasoline, compensating for the loss in octane caused by the reduction in aromatics and olefins; it also has low atmospheric reactivity and good stability； It has a relatively high oxygen content, which can significantly improve automobile exhaust emissions by reducing the levels of CO and HC in the exhaust gas

Methyl tert-butyl ether is currently the alternative to tetraethyl lead. It is produced by using isobutylene and methanol from cracked C4 as raw materials, under the catalysis of macroporous sulfonic acid cation exchange resin, and then refined. Product properties: This substance has a scent similar to camphor; it is colorless and transparent. At room temperature, it is fully miscible with alcohols, ethers, aliphatic hydrocarbons, aromatic hydrocarbons, and halogenated solvents. Like other methyl tert-alkyl ethers, this substance also possesses another very important property, namely strong resistance to auto-oxidation, as it does not readily form peroxides. It is mainly used by refineries as a blending agent for high-octane gasoline, and can also serve as a solvent for paraffins, oils, fragrances, alkaloids, resins, and rubber, as well as a reagent in organic synthesis reactions. It is flammable and volatile, and poses a risk of explosion in the presence of ignition sources or heat. In the 1970s, MTBE began to attract attention as a gasoline blending component to improve gasoline octane rating. MTBE can increase the octane rating of gasoline, and it has stable chemical properties. Gasoline with added MTBE can also improve a vehicle’s driving performance and reduce the level of carbon monoxide in exhaust gases. It also has a high combustion efficiency, which helps to suppress the formation of ozone. It can replace tetraethyl lead as an anti-knock agent to produce lead-free gasoline. Currently, about 95% of MTBE is used as an octane booster and an oxygenate in gasoline. MTBE is also an important raw material for producing polymeric isobutylene. It is also used in the production of methacraldehyde and methacrylic acid. In 1973, Italy developed the world’s first set of MTBE industrial plants. The Air Clean Act Amendment (CAA-1990) enacted in the United States in 1990 required new formulations of gasoline to contain oxygenates such as MTBE in order to reduce vehicle pollution. China began researching MTBE technology in the late 1970s and early 1980s. In 1983, the rubber factory of Qilu Petrochemical Company built China’s first industrial pilot plant for MTBE, and in 1986, Jihua Company constructed China’s first industrial MTBE plant with a production capacity of 10,000 tons per year. In 1999, China launched the \"National Air Purification Project – Clean Vehicles Initiative\", beginning to encourage the use of gasoline containing MTBE. As an octane booster for gasoline, MTBE not only increases the oxygen content in gasoline but also promotes cleaner combustion, thereby reducing harmful emissions from vehicles. MTBE has a certain solubility in water; therefore, primarily due to leaks from underground and above-ground gasoline tanks, MTBE is being found increasingly in underground drinking water sources in the United States. MTBE can cause unpleasant odors in water quality even at very low concentrations. The U.S. Environmental Protection Agency has listed MTBE as a possible human carcinogen. MTBE is added to gasoline in the United States not only to meet the requirement of 2% oxygen content in gasoline, but also because MTBE has the advantage of a road octane rating of 110 and an RVP (Reid Vapor Pressure) of only 8 (pounds per square inch). Adding MTBE meets the requirement of 2% oxygen content in gasoline, increasing its volume by 11%. The United States originally set 3.65% of the total gasoline volume to be MTBE, and about 87% of gasoline in the new formulations uses MTBE as an oxygenate. Due to the pollution of water quality caused by MTBE, California in the United States banned it in 2004, and states such as Arizona, Connecticut, and New York also banned MTBE in 2005. Other states have also reduced the amount of MTBE added and joined the ranks of those that have banned it. Australia also banned MTBE in 2004. Since 2006, the pace of banning MTBE in gasoline in the United States has accelerated further. Since May 2006, 25 states in the United States have banned MTBE. The demand for MTBE in the United States is expected to decline from 12.9 million tons per year in 2001 to 3.44 million tons per year by 2010. Global MTBE demand reached a peak of 22.58 million tons per year in 2001, and it is predicted that demand will continue to decline in the future.

It mainly reduces olefins and increases octane number.

MTBE can be depolymerized to produce high-purity isobutylene, which is used in the production of rubber or plexiglass. Methyl methacrylate downstream can also be developed.