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Tetraethyl lead is a metal anti-knock agent that is extremely cost effective, powerful and unmatched by ethanol gasoline, which undoubtedly has some harmful effects. However, it is the best product available today to solve the problem of low grade gasoline and increase the octane number.

Tetraethyl lead was once widely used as an additive in gasoline to increase the octane rating of the fuel to prevent detonation within the engine, thus enabling the use of higher compression ratios, thereby increasing the efficiency and power of the car engine. This compound is commonly used as an additive in automotive gasoline to increase the octane number and as an anti-shock detonation agent, thereby extending the life of the components.

Leaded gasoline, also known as leaded gasoline, refers to gasoline with a certain amount of tetraethyl lead added to the gasoline for vehicles. As an efficient gasoline anti-explosion additive, tetraethyl lead can improve the octane number of gasoline for vehicles, and the addition of 0.1% in general gasoline can improve the octane number by 14-17 units. The engine is the "heart" of the car, this frequent "premature" brought about by a decline in power, increased fuel consumption and mechanical damage, "burst" has become a major problem plaguing the automotive industry. It is this product to solve the problem of explosive shock.

Tetraethyl lead anti-explosive agent to increase octane number.

It was the "knock" phenomenon that occurred during the operation of automobile gasoline engines in the early 20th century that made tetraethyl lead stand out from the "noise" of many of the organometallic compounds known at the time as the most commercially valuable member of the class. To understand the importance of tetraethyl lead as a knock inhibitor, let us consider the example of a simple four-stroke cycle internal combustion engine. This cycle has four strokes. In the intake stroke (a), the intake valve has been opened and the piston moves downward to draw a uniform mixture of air and gasoline vapor into the cylinder. This is followed by the compression stroke (b); the intake valve is closed and the piston moves upward, compressing the fuel/air mixture. In the next power stroke (c), the ignition system generates a spark that ignites the mixture. The combustion generates high pressure, which pushes the piston downward. Then comes the exhaust stroke (d), in which the exhaust valve has opened and the piston moves upward, forcing the burning gases out of the cylinder. After most of the fuel/air mixture has burned, a small portion of the less volatile, unburned mixture that remains in the cylinder often bursts, caused by high temperatures and pressures; this is known as "popping". The consequences of detonation, in addition to irritating noise, are overheating, loss of power output, waste of gasoline, and, in extreme cases, damage to the engine.

In the hot cylinder of a gasoline engine, the bonds between the lead atom and the ethyl groups are broken. Upon combustion, the lead atom forms lead oxide (PbO), which prevents fractions of the fuel mixture from burning too quickly and causing a highly undesirable “engine knock.” Beginning in the 1920s, TEL, added to gasoline in very small quantities (not exceeding 3 cubic cm per gallon), considerably improved engine performance. To prevent accumulation of lead deposits in the cylinders, a small quantity of ethylene bromide was added to the gasoline. The lead and bromine formed a compound that left the engine in the exhaust.

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