Road octane

Two octane numbers are routinely used to simulate engine performance the research octane number (RON) simulates gasoline performance under low severity ( 600 rpm and 120°F (49°C) air temperature), whereas the motor octane number (MON) reflects more severe conditions ( 900 rpm and 300°F (149°C) air temperature). At the pump, road octane, which is the average of RON and MON, is reported. 

Both alkylate and ether have excellent properties as gasoline blending components. They have a low RVP, a high road octane, no aromatics, and virtually zero sulfur. The emphasis on alkylation and etherification will continue in both the U.S. and the rest of the world. 

Figure 8. Road Octane Performance of Motor Fuels...

Road Octane—A numerical value based upon the relative antiknock performance of an automobile with a test gasoline as compared with specified reference fuels. Road octanes are determined by operating a car over a stretch of level road or on a chassis dynamometer under conditions simulating those encountered on the highway. 

Motor Octane Number (MON), Road Octane Number and Anti-Knock Index (AKI) are also used. 

The DIP feed and overhead values are ealculated as the gasoline blending value of the /C5 and MC5 in this stream, with corrections for road octane and RVP of these components versus those of conventional regular gasoline. The DIP bottoms stream... 

The CER engine is operated at two conditions to simulate typical on-road driving conditions. The less severe condition measures research octane number (RON) the more severe one measures motor octane number (MON). Table 1 summarizes the operating conditions for each test. 

Research octane numbers arc those obtained under test or laboratory conditions they generally run about ten points higher than the so-called motor octane numbers, which represent actual road operating conditions. 

Exposure to airborne lead from motor vehicles using leaded petrol has been the subject of a great deal of scientific debate. Old vehicles with poor emission control are allowed to travel freely on the Indian roads. Currently, there is no effort towards providing lead-free petrol in India, whereas in all major cities of the industrialized nations strict emission controls are enforced. The use of cleaner fuels [10] has led to declining emissions in recent years. In India, the lead content in petrol has increased with a rise in the octane number from 83 to 87 since 1983. 

The seminal paper on chemical shift sums [82], thus, has opened a novel avenue in the studies of molecules, but apparently the new road has hardly been traveled. There have been few publications worth noticing, beyond the extension of the paper on chemical shifts of octanes to chemical shifts of nonane isomers... 

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