tetraethyl lead


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tetraethyl lead

(tĕt'rəĕth`əl), (C2H5)4Pb, viscous, colorless, poisonous liquid. It is an organometallic compound prepared by reacting ethyl chloride with a sodium-lead alloy. When added to gasoline, it improves the combustion characteristics (see octane numberoctane number,
figure of merit representing the resistance of gasoline to premature detonation when exposed to heat and pressure in the combustion chamber of an internal-combustion engine.
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). When tetraethyl lead burns in an engine, lead oxide is formed. Ethylene dibromide is usually also added to the gasoline; on burning, the resulting mixture forms products that react with the lead oxide to form lead bromide, a volatile compound that escapes from the engine with other exhausted products. Because the lead bromide is poisonous, lead-free gasolines are required in the United States. An additional reason for lead-free gas is that the lead in the exhaust pipe would poison the catalytic converter that is standard equipment for U.S. cars. Catalytic converters which serve to oxidize unburned hydrocarbons, carbon monoxide, and nitrogen oxides contain platinum group metals that are inactivated by lead.

tetraethyl lead

a colourless oily insoluble liquid used in petrol to prevent knocking. Formula: Pb(C2H5)4
References in periodicals archive ?
Adding tetraethyl lead to gasoline resulted in large emissions into the
In a statement, the SFO said Mr Jennings "is accused of two allegations of conspiracy to corrupt, in that he gave or agreed to give corrupt payments to public officials and other agents of the Gover nments of Indonesia and Iraq as inducements to secure, or as rewards for having secured, contracts from those gover nments for the supply of its products including Tetraethyl Lead by Innospec.
Finally, to put the controversy to rest, the Surgeon General appointed an advisory committee, to conduct a definitive study and make recommendations regarding the production and sale of tetraethyl lead.
Tetraethyl lead "becomes dangerous due to carelessness of the men in handling it.
Limited to t he twentieth century and a focus on lead-based paints and tetraethyl lead in gasoline, the study is divided into three parts.
From 1926 to 1929, Imperial had a semi-exclusive right to the use of tetraethyl lead in Canada as an additive to increase the octane rating of straight-run gasoline.
They halted a multinational's plans to double production of tetraethyl lead for export to the Third World.
And McKibben calls Thomas Midgley, the General Motors chemist who invented both chlorofluorocarbons and tetraethyl lead gasoline additives, the one "who may now hold the record for most banned substances produced by a singled man.
All other" includes the results of our tetraethyl lead (TEL) business, as well as certain contract manufacturing performed by Ethyl Corporation.
The bribes were intended to secure, or serve as rewards for having secured, contracts from the Government of Indonesia for the supply of Innospec products including Tetraethyl Lead, also known as TEL, a highly dangerous compound created as an octane booster to be added to engine fuel.
As a newly minted physician, Kehoe was tasked with investigating deaths in General Motors' pilot tetraethyl lead plant, the "House of Butterflies," named for the hallucinations common to its workers; his success there led him in 1930 to found the Kettering Laboratory, named after GM's own director of research.