THREE in Visual C#

Recognizer USS Code 128 in Visual C# THREE

CHAPTER THREE
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Isoparaffins have higher octane numbers than the corresponding normal isomers, and the octane number increases as the degree of branching of the chain is increased Olefins have markedly higher octane numbers than the related paraffins; naphthenes are usually better than the corresponding normal paraffins but rarely have very high octane numbers; and aromatics usually have quite high octane numbers Blends of n-heptane and isooctane thus serve as a reference system for gasoline and provide a wide range of quality used as an antiknock scale The exact blend, which matches identically the antiknock resistance of the fuel under test, is found, and the percentage of isooctane in that blend is termed the octane number of the gasoline For example, gasoline with a knocking ability which matches that of a blend of 90 percent isooctane and 10 percent n-heptane has an octane number of 90 With an accurate and reliable means of measuring octane numbers, it was possible to determine the cracking conditions temperature, cracking time, and pressure that caused increases in the antiknock characteristics of cracked gasoline In general it was found that higher cracking temperatures and lower pressures produced higher octane gasoline, but unfortunately more gas, cracked residua, and coke were formed at the expense of the volume of cracked gasoline To produce higher-octane gasoline, cracking coil temperatures were pushed up to 510 C (950 F), and pressures dropped from 1000 to 350 psi This was the limit of thermal cracking units, for at temperatures over 510 C (950 F) coke formed so rapidly in the cracking coil that the unit became inoperative after only a short time on-stream Hence it was at this stage that the nature of the gasoline-producing process was reexamined, leading to the development of other processes, such as reforming, polymerization, and alkylation for the production of gasoline components having suitably high octane numbers During the manufacture and distribution of gasoline, it comes into contact with water and particulate matter and can become contaminated with such materials Water is allowed to settle from the fuel in storage tanks and the water is regularly withdrawn and disposed of properly Particulate matter is removed by filters installed in the distribution system (ASTM D 4814, App X6) Oxygenates are carbon-, hydrogen-, and oxygen-containing combustible liquids that are added to gasoline to improve performance The addition of oxygenates gasoline is not new since ethanol (ethyl alcohol or grain alcohol) has been added to gasoline for decades Thus, oxygenated gasoline is a mixture of conventional hydrocarbon-based gasoline and one or more oxygenates The current oxygenates belong to one of two classes of organic molecules: alcohols and ethers The most widely used oxygenates in the United States are ethanol, methyl tertiary-butyl ether (MTBE), and tertiary-amyl methyl ether (TAME) Ethyl tertiary-butyl ether (ETBE) is another ether that could be used Oxygenates may be used in areas of the United States where they are not required as long as concentration limits (as refined by environment regulations) are observed Of all the oxygenates, methyl tertiary-butyl ether is attractive for a variety of technical reasons It has a low vapor pressure, can be blended with other fuels without phase separation, and has the desirable octane characteristics If oxygenates achieve recognition as vehicle fuels, the biggest contributor will probably be methanol, the production of which is mostly from synthesis gas derived from methane The higher alcohols also offer some potential as motor fuels These alcohols can be produced at temperatures below 300 C (572 F) using copper oxide-zinc oxide-alumina catalysts promoted with potassium Isobutyl alcohol is of particular interest because of its high octane rating, which makes it desirable as a gasoline-blending agent This alcohol can be reacted with methanol in the presence of a catalyst to produce methyl tertiary-butyl ether Although it is currently cheaper to make isobutyl alcohol from isobutylene, it can be synthesized from syngas with alkali-promoted zinc oxide catalysts at temperatures above 400 C (752 F)
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Scan PDF 417 In VB.NET
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Linear Recognizer In Java
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