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Studies of Octane Properties of Mixtures of Isomeric Hexanes
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English
Abstract
The five noncyclic hexane homologs were mixed and tested for their octane qualities. The mixtures of normal hexane with the branched homologs, as well as a few of the combinations of branched species, had statistically significant higher octane quality than would be expected if the compounds responded in the CFR octane test engines as a linear combination of the individual components. It is hypothesized that this positive interaction is a reflection, of the formation of intermediates, via intermolecular hydrogen abstraction reactions, which are not able to progress along branching pathways during the combustion process. The formation of these intermediates delays the low temperature reaction kinetics, making the reaction mixture more knock resistant than expected.
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Citation
Croudace, M. and Jessup, P., "Studies of Octane Properties of Mixtures of Isomeric Hexanes," SAE Technical Paper 881604, 1988, https://doi.org/10.4271/881604.Also In
References
- Green, R. M. Cernansky, W. J. Pitz, N. P. West-brook, C. K. “The Role of Low-Temperature Chemistry in the Autoignition of n-Butan” SAE Paper No. 872108 1987
- Smith, J. R. Green, R. M. Westbrook, C. K. Pitz, W. J. “An Experimental and Modelling Study of Engine Knock” Twentieth Syrnp. (Int.) on Combustion 91 The Combustion Inst. Pittsburg 1984 Pitz, W. J. Westbrook, C. K. “Chemical Kinetics of High Pressure Oxidation of n-Butane and Its Relation to Engine Knock” Combustion and Flame 63 113 1986 Cernansky, N. P. Green, R. M. Pitz, W. J. Westbrook, C. K. “Chemistry of Fuel Oxidation Preceding End Gas Autoignition” Combustion Science and Technology 50 3 1986 Green, R. M. Parker, C. D. Pitz, W. J. Westbrook, C. K. “The Autoignition of Isobutane in a Knocking Spark Ignition Engine” SAE Paper 872169 November 1987 Green, R. M. Cernansky, N. P. Pitz, W. J. Westbrook, C. K. “The Role of Low Temperature Chemistry in Autoignition of n-Butane” SAE Paper 872108 November 1987 Leppard, W. R. “The Autoignition Chemistry of n-Butane: An Experimental Study” SAE Paper 872150 November 1987 Leppard, W. R. “A Detailed Chemical Kinetic Simulation of Engine Knock” Combustion Science and Technology 43 1 1985 Esser, C Maas, U. Warnatz, J. Transactions of COMMODIA - International Symp. on Diagnostics and Modelling of Combustion in Reciprocating Engines Tokyo, Japan 1985 335
- Pitz, W. J. Westbrook, C. K. Proscia, W. M. Dryer, F. L. “A Comprehensive Chemical Kinetic Reaction Mechanism for the Oxidation of n-Butane” Twentieth Symp. (Int.) on Combustion 831 The Combustion Inst. Pittsburg 1985 Westbrook, C. K. Pitz, W. J. “A Comprehensive Chemical Kinetic Reaction Mechanism for the Oxidation and Pyrolysis of Propane and Propene” Combustion Science and Technology 37 117 1984
- Lignola, P. G. Reverchon, E. “Cool Flames” Prog. Energy Comb. Sci. 13 75 1987 Griffiths, J. F. The Fundamentals of Spontaneous Ignition of Gaseous Hydrocarbons and Related Organic Compounds” Adv. Chem. Phys. 64 203 1986
- Boord, C. E. Derfer, J. M. Smith, M. L. Mena-pace. H. R. Kyryacos, G. “The Behaviour of Blends of Pure Hydrocarbons in Cool Flames as Related to Their Deviations From Linear Blending on the Performance Number Scale” Proceedings API 38 111 112 119 1958
- Brown, J. E. Greenlee, K. W. Tindall, E. M. “Octane Numbers of Pure Hydrocarbon Blends and Their Relationship to Precombustion Reactions” Presented at the API Division of Refining During the 27th. Midyear Meeting San Francisco May 1962
- American Petroleum Institute Research Project 45 “Knocking Characteristics of Pure Hydrocarbons” ASTM Special Technical Publication 1958
- Fish. A. Wilson, J. P. “The Nonisothermal Oxidation of 2,3-Dimethyl Butane” Thirteenth Symp. (Int.) on Combustion 229 1970 Alcock, W. G. Miles, B. “Gas Phase Reactions of Alkylperoxy and Alkoxy Radicals I: The Photoini-tiated Oxidation of 2,3-Dimethyl Butane” Combustion and Flame 29 133 144 1977 Sueyasu. S. Hikita, T. “Study of Low Temperature Flames of n-Hexane” Combustion and Flame 9 1 6 1965 Oberdorfer, P. E. Boord, C. E. “The Cool Flame Combustion of Isomeric Hexanes” Presented before the Division of Petroleum Chemistry of the American Chemical Society, National Meeting September 1955 183 185 Salooja, K. C. “The Degenerate Chain Branching Intermediate in Hydrocarbon Combustion: Evidence From Studies on Isomeric Hexanes” Combustion and Flame 9 219 1965
- Halstead, M. P. Kirsch, L. J. Prothero. A. Quinn, C. P. “A Mathematical Model for Hydrocarbon Autoignition at High Pressure” Proc. Roy. Soc. Lond. A346 515 1975
- Cox, R. A. Cole, J. A. “Chemical Aspects of Autoignition of Hydrocarbon-Air Mixtures” Combustion and Flame 60 109 123 1985
- Benson, S. W. Nangia, P. S. “Some Unresolved Problems in Oxidation and Combustion” Accts. Chem. Res. 12 7 223 1979
- Benson. S. W. “The Kinetics and Thermochemistry of Chemical Oxidation With Application to Combustion and Flames” Prog. Energy Combustion Sci. 7 125 134 81
- Morley, C. “A Fundamentally Based Correlation Between Alkane structure and Octane Number” Combustion Science and Technology 55 115 123 1987
- Walsh, A. D. “The Knock Rating of Fuels” Ninth Symp. (Int) on Combustion 1046 1963
- Sturgis, B. M. “Knock and Antiknock Action” SAE Transactions 63 253 1955
- Salooja, K. C “Studies of Combustion Processes Leading to Ignition of Isomeric Hexanes” Combustion and Flame 6 275 285 1962
- Baldwin, R. R. Bennett, J. P. Walker, R. W. “Rate Constants for Elementary Steps in Hydrocarbon Oxidation” Sixteenth Symp. (Int.) on Combustion 1041 1977
- Baldwin, R. R. Bennett, J. P. Walker, R. “Addition of n-Pentane to Slowly Reacting Mixtures of Hydrogen and Oxygen at 480 C” J. Chem. Soc., Faraday Trans. I 76 1075 1980
- Fish, A. “Cool Flames of Hydrocarbons” Angew. Chem., Int. Ed. 7 45 1968 Fish, A. “Chain Propagation in the Oxidation of Aikyl Radicals” Adv. Chem. Series 76 Oxidation of Organic Compounds II 69 1968 Fish, A. Organic Peroxides Swern D. I Wiley New York 1970 141