Published: Jun 1998
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THE CHALLENGE TO DEVELOP more accurate and precise test methods for the analysis of gasoline or automotive sparkignition engine fuel has been tremendously influenced by federal and state regulations covering the production of reformulated gasolines (RFG) with tight limits on many parameters. Examples of these new fuels include U.S. Environmental Protection Agency (EPA) RFG and California Air Resources Board (CARB) Phase 2 Gasoline. The regulated RFG test parameters include vapor pressure, distillation, benzene content, total aromatics, total olefins, individual oxygenates, oxygen content, and total sulfur. Regulatory requirements have enhanced the need for better test methods to control manufacturing and the distribution of gasolines. The addition of alcohol and ether as important blending components to gasoline to meet air quality standards has necessitated modifying some existing test methods and the development of new procedures. The desire to reduce manufacturing costs, coupled with the regulatory requirements, have enhanced the application of more cost effective test methods including rapid screening procedures and wider use of online analyzers. In this chapter, a brief history of ASTM method development for hydrocarbon analysis of gasoline is given. The focus, however, will be on some of the test parameters required for today's reformulated gasolines including many of the new test methodologies.