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Topic: Isooctane

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	10/16/96 - What does the octane rating of gasoline mean? (Site not responding. Last check: 2007-10-13)
		To describe how fast a gasoline burns, a scale was developed using these two chemicals.
		Isooctane is defines to have an octane rating of 100, which n-hepatine has an octane rating of 0.
		Gasoline with an octane rating of 87 burns he same way that a mixture of 87 percent isooctane and 13 percent n-heptane would burn.
	www.pa.msu.edu /~sciencet/ask_st/101696.html (200 words)

	Patent Watch - July 31, 2006 (Site not responding. Last check: 2007-10-13)
		This process is based on catalytically reforming isooctane (which can be made by the addition of isobutylene to isobutane or the dimerization of isobutylene to isooctene followed by hydrogenation) to a mixture of aromatics high in p-xylene content.
		The isooctane as a 10% mixture in nitrogen is passed over the catalyst in a tubular reactor at 525 °C with a contact time of 1.6 s.
		The remainder of the effluent consists of regenerated isobutylene, isobutane, isooctane, benzene, and toluene.
	www.chemistry.org /portal/a/c/s/1/acsdisplay.html?DOC=patentwatch\archive\073106_patentwatch.html (287 words)

	Microcrystalline wax
		Protect the sulfoxide from air and moisture during this operation by covering the solvent in the funnel and collection flask with a layer of isooctane.
		Adjust the nitrogen pressure so that the rate of descent of the isooctane coming off of the column is between 2-3 ml per min.
		Dissolve the residue, transfer quantitatively, and adjust to volume in isooctane in a 25-ml volumetric flask.
	www.fao.org /docrep/W6355E/w6355e0m.htm (3905 words)

	CRC \| Week In Chemistry \| 07-26-98
		A liquid that is made up of 100% pure isooctane has a rating of 100 octane.
		A 90 octane fuel is 90% isooctane and 10% heptane.
		Isooctane is a branched molecule, unlike other octanes which can be straight.
	library.thinkquest.org /21192/highg/f072698.html (294 words)

	Process for bacterial treatment of hydrocarbon effluents that contain isoalkanes - Patent 6403365
		According to an embodiment, it is possible to use the colony according to the invention in the presence of air in at least one biofilter that is fed with the effluent from which pollution is to be removed.
		The residual isooctane of the flasks is measured after extraction with dichloromethane and separation by gas phase chromatography on a PONA column (Chrompack) and flame ionization detection.
		The rate of degradation of the isooctane, which is equal to the isooctane molar fraction that is consumed by the culture, as well as the mineralization rate, are calculated.
	www.freepatentsonline.com /6403365.html (2767 words)

	Problems on Chapter 5
		Isooctane is a component of gasoline and is used as a reference standard in determining the “octane rating” of a fuel mixture.
		Suppose 0.542g of isooctane is placed in a fixed volume container (bomb) calorimeter, which contains 750g of water, initially at 20.450C, surrounding the reaction compartment.
		After the combustion of the isooctane is complete, the water temperature is measured to be 28.670C.
	homepages.nyu.edu /~vk276/ch9problems.htm (578 words)

	Full Text - Lipase-catalyzed enantioselective esterification of flurbiprofen with n-butanol
		The Crl-catalyzed reactions in n-heptane and n-nonane had similar water activity dependence, but the reaction was considerably faster and more enantioselective (preferring the S-enantiomer reaction) in isooctane, a solvent whose hydrophobicity is intermediate between that of the other two alkanes.
		Since the three solvents possess similar physical properties, the explanation for this anomalous behavior might be the effect of the solvent structural characteristics on Crl, since isooctane is the only branched alkane.
		Before speculating on what distinguishes isooctane from the other two solvents, it is worth noting if this phenomenon is also observed with the other lipases used in this study.
	www.ejbiotechnology.info /content/vol3/issue3/full/3/index.html (2161 words)

	BioMed Central \| Full text \| Display of a thermostable lipase on the surface of a solvent-resistant bacterium, ... (Site not responding. Last check: 2007-10-13)
		A two-phase fermentation system, consisting of 10 ml of isooctane to dissolve the olive oil and 10 ml of LB medium for cell growth, was used for whole cell hydrolysis of olive oil.
		Released fatty acids dissolved in the isooctane phase were determined by the cupric acetate method using oleic acid as a reference.
		To synthesize triacylglycerol in an organic solvent, 10 ml of isooctane was used to dissolve glycerol (100 mM) and oleic acid (10 mM), and Na (0.2 g anhydrous) was added to adjust the pH.
	www.biomedcentral.com /1472-6750/6/23 (4320 words)

	FDA > CDRH > CFR Title 21 Database Search
		Just before the isooctane surface reaches the top of the aluminum oxide bed, add 200 milliliters of a mixture of benzene and isooctane (33 1/3 percent benzene and 66 2/3 percent isooctane by volume) to the reservoir, and continue the percolation.
		Add to the reservoir 300 milliliters of a mixture of benzene and isooctane (90 percent benzene and 10 percent isooctane by volume), place a 25-milliliter graduated cylinder under the column, continue the percolation until 20 milliliters of eluate has been collected, and then discard the eluate.
		Apply nitrogen pressure to the top of the column, adjusting the pressure so that the isooctane is collected at the rate of 2.5 to 3.5 milliliters per minute, and percolate isooctane through the bed until a quantity of 75.0 milliliters of eluate is collected.
	www.accessdata.fda.gov /scripts/cdrh/cfdocs/cfcfr/CFRSearch.cfm?fr=178.3620 (6104 words)

	Petroleum jelly
		It is of the greatest importance that all glassware be scrupulously cleaned to remove all organic matter such as oil, grease, detergent residues, etc. Examine all glassware, including stoppers and stopcocks, under ultraviolet light to detect any residual fluorescent contamination.
		Filter the first extract through anhydrous sodium sulfate prewashed with isooctane (see Sodium sulfate under "Reagents and Materials" for preparation of filter), into a 250-ml Erlenmeyer flask, or optionally into the evaporating flask.
		Carefully draw off the lower layer, filter it slowly through a thin layer of glass wool fitted loosely in a filter funnel into the first 250-ml separatory funnel, and wash in tandem with the 30-ml portions of isooctane contained in the 250-ml separatory funnels.
	www.fao.org /docrep/W6355E/w6355e0p.htm (3793 words)

	FDA > CDRH > CFR Title 21 Database Search
		Dilute 1.0 milliliter of n-hexadecane to 25 milliliters with isooctane and determine the absorbance in a 5-centimeter cell compared to isooctane as reference point between 280 m[micro]-400 m[micro].
		Quantitatively transfer the isooctane solution to a 125-milliliter flask equipped with 24/40 joint and evaporate the isooctane on the steam bath under a stream of nitrogen to a volume of 1 milliliter of hexadecane.
		Just before the last of the isooctane reaches the adsorbent level, add 100 milliliters of 10 percent benzene in isooctane to the reservoir and continue the percolation at the aforementioned rate.
	www.accessdata.fda.gov /scripts/cdrh/cfdocs/cfcfr/CFRSearch.cfm?fr=172.886 (3667 words)

	Section
		The isooctane and benzene designated in the list following this paragraph shall pass the following test: To be specified quantity of solvent in a 250-milliliter Erlenmeyer flask, add 1 milliliter of purified n-hexadecane and evaporate on the steam bath under a stream of nitrogen (a loose aluminum foil jacket around the flask will speed evaporation).
		Dilute 1.0 milliliter of n- hexadecane to 25 milliliters with isooctane and determine the absorbance in a 1-centimeter cell compared to isooctane as reference point between 280 m[micro]-400 m[micro].
		In a 1-liter separatory funnel place a representative 25-gram sample of wax, add 50 milliliters of isooctane, heat gently, stir until the wax is in solution; add 100 milliliters of preequilibrated sulfoxide- phosphoric acid mixture and shake, making sure it remains in solution.
	a257.g.akamaitech.net /7/257/2422/01apr20051500/edocket.access.gpo.gov/cfr_2005/aprqtr/21cfr178.3770.htm (3284 words)

	SportbikeS.com the eZine
		While gasoline is a complex mixture, Isooctane and n-heptane are ¡§neat¡¦ fuels, meaning all the molecules are of a configuration known as isooctane or n-heptane.
		Isooctane is very resistant to knock while n-heptane is horrible at resisting knock.
		Then the mixture of isooctane and n-heptane is adjusted to produce a knocking at that compression ratio.
	more.sportbikes.com /ezine/articles.php?articleId=95 (1995 words)

	NCGA - Ethanol (Site not responding. Last check: 2007-10-13)
		·Isooctane can be produced in refineries or MTBE plants that have been modified.
		Pure isooctane contains no aromatics or olefins and exhibits a road octane number of 100 and an RVP of 2 psi.
		However, operating costs of the facilities will increase and the octane value of the isooctane product will be about 10 points less than that of MTBE.
	www.ncga.com /ethanol/main/FAQ.htm (1588 words)

	[No title] (Site not responding. Last check: 2007-10-13)
		Silene 2 decays on the microsecond timescale with mixed first- and second-order kinetics in deoxygenated isooctane solution (tau < 13000 ns), and with first-order kinetics (tau ~ 800 ns) in dried acetonitrile.
		Direct photolysis of 1 in the presence of a series of carbonyl compounds affords high chemical yields of the corresponding methyldiphenylsilyl enol ethers by formal ene-addition.
		The kinetic data for the reactions of 2 with carbonyl compounds are consistent with a concerted, non-pericyclic mechanism, in which Si-O bond formation and H-transfer proceed asynchronously.
	www.chemistry.mcmaster.ca /~wjl/leigh/wjl-ref6.html (278 words)

	Gasoline (Site not responding. Last check: 2007-10-13)
		The octane number of gasoline is a measure of its resistance to knock.
		It is a highly branched compound that burns smoothly, with little knock.
		Straight-run gasoline (directly from the refinery distillation column) has an octane number of about 70.
	www.elmhurst.edu /~chm/vchembook/514gasoline.html (413 words)

	Annex3
		Wash the first separatory funnel with the second 40 ml isooctane extractive, and pass through the sodium sulfate into the flask.
		Transfer the filtrate to a 2-l separatory funnel and draw off the dimethyl sulfoxide into the 2-l distillation flask of the vacuum distillation assembly and distill at approximately 3 mm Hg pressure or less.
		Determine the absorbance of the solution in the 5 cm path length cells compared to isooctane as reference between 280 nm-400 nm (take care to lose none of the solution in filling the sample cell).
	apps3.fao.org /jecfa/intro/Annex3.htm (7558 words)

	Chem Systems PERP Program Newsletter (Site not responding. Last check: 2007-10-13)
		Now, due to the potential phase-out of MTBE in the U.S., several technology licensors have modified the isooctane process to accomplish the dimerization step utilizing the same catalyst used in the MTBE production process in the same equipment and at essentially the same process conditions.
		It is important to note that due to the presence of other butene compounds besides isobutylene and the selectivity limits inherent in the acid catalysts, the actual product from the isooctane process is a mixture of octane isomers, commonly referred to as isooctane gasoline.
		Physical properties for a typical isooctane gasoline are presented in the table below along with properties for other common gasoline blend components.
	www.chemsystems.com /newsletters/perp/april01_99_7_abs.cfm (601 words)

	Screening of Genes Involved in Isooctane Tolerance in Saccharomyces cerevisiae by Using mRNA Differential Display -- ...
		A Saccharomyces cerevisiae strain, KK-211, isolated by the long-term bioprocess of stereoselective reduction in isooctane,
		isooctane as the carbon source was also examined.
		Adhesion of DY-1 (A) and KK-211 (B) cells to isooctane droplets.
	aem.asm.org /cgi/content/full/66/11/4883 (4068 words)

	EV112 Fossil Fuel Combustion
		The octane number is defined empirically as the percentage of isooctane (with an octane number of 100) mixed with heptane (C7H16; with octane number of 0) that has the same knock characteristics as the fuel in question.
		For example, a mixture of 92% isooctane and 8% heptane would have an octane number of 92.
		Fuels that result in more engine knock than pure isooctane have octane numbers less than 100, while fuels that give less engine knock than isooctane have octane numbers greater than 100.
	www.coloradocollege.edu /dept/ev/courses/EV112/Combust.html (2879 words)

	Gasoline Combustion (Site not responding. Last check: 2007-10-13)
		Gasoline is a mixture of many hydrocarbons; for the purposes of this answer I will estimate that it consists of isooctane, which has the composition C8H18.
		Each molecule of isooctane that burns completely produces 8 molecules of CO2 and 9 molecules of H2O.
		You would be converting 280 liters oxygen +.16 liters isooctane to 180 liters carbon dioxide + 0.16 liters water, for an overall volume LOSS of 100 liters per mole.
	www.newton.dep.anl.gov /askasci/chem99/chem99583.htm (407 words)

	Airliners
		Isooctane has the interesting property of not knocking in any engine under any conditions.
		Now that the octane scale has been developed, every fuel company wants isooctane so they can rate their gasolines.
		Of course, isooctane can be used as fuel alone, but to make it easier to handle and to make more of the "super-fuel" available, the isooctane is mixed with the highest quality natural gasolines.
	www.pslc.ws /mactest/exp/rubber/synth/butyl.htm (1032 words)

	Musclecarclub.com - Library - Dictionary - Automotive - 2
		Often used in racing as a source of compressed air that can be forced into the motor for short periods of greater power.
		Octane Rating: A unit of measurement on a scale intended to indicate the tendency of a fuel to detonate or knock based on the percentage of isooctane in the fuel.
		The higher the rating, the higher the percentage of isooctane and therefore the greater the resistance to detonation offered by the fuel.
	www.musclecarclub.com /library/dictionary/dictionary-automotive-2.shtml (3029 words)

	[No title]
		Issue: You stated that the fuel injector flow rate specifications in section 8.5.5.1 of the ASTM D 5550-94 procedure were produced by ASTM based on data from flow tests on the fuel injectors which were available when the procedure was developed in 1993.
		You also stated that due to the viscosity differences between isooctane and Stoddard solvent, a proper fuel injector spray pattern cannot be attained using Stoddard solvent.
		EPA Response: EPA agrees that the Stoddard solvent flow specifications in the ASTM D 5500-94 procedure are unrepresentative and should be replaced with the specifications suggested in your letter dated September 24, 1997.
	www.epa.gov /oms/regs/fuels/additive/detergnt/astmmods.txt (3124 words)

	Innovene Home - Isooctane 100
		Isooctane 100 has a range of properties including low toxicity, lack of colour, high colour stability, low odour and rapid evaporation / drying which makes it an excellent solvent for a variety of surface applications.
		It has found particular use in the extraction of fats.
		For more information on the market sectors in which isooctane 100 is used please follow links below
	www.innovene.com /genericarticle.do-categoryId=9002883&contentId=7005816.htm (145 words)

	Chemical Molecule Library (Site not responding. Last check: 2007-10-13)
		Both ocatane and isooctane are isomers - they have the same molecular formula but different structures.
		The ability to burn smoothly or the quality of the petrol is indicated by its octane number.
		A poor fuel has a zero octane number, whereas a good fuel has an octane number of 100.
	www.ch.ic.ac.uk /vchemlib/mol/simple/fuels/isooctanebak.html (163 words)

	[No title]
		The sample was analyzed by ASTM method D 544198 “Standard Test Method for Analysis of Methyl tert-Butyl Ether (MTBE) by Gas Chromatography.” The MTBE concentration in the commercial isooctane sample was 0.074 volume percent.
		In a gasoline in which this isooctane was present at 20 percent of the final volume, the MTBE concentration from this source would be 0.015 volume percent.
		In a gasoline in which this isooctane was present at 20 percent of the final volume, the MTBE concentration from this source would be 0.01 volume percent.
	www.arb.ca.gov /regact/mtberesid/appdxg.doc (895 words)

	The Meaning of RON and MON (Site not responding. Last check: 2007-10-13)
		The two primary reference fuels, Isooctane (2,2,4 trimethyl pentane) and n-heptane were arbitrarily chose and, again arbitrarily, assigned "octane" numbers of 100 and zero, respectively.
		A fuel's "octane" rating is found by comparing it's knock characteristics with various mixtures of n-heptane and Isooctane.
		For example, a "octane" rating of 92 means that the fuel being tested, under standard conditions and running in a sta ndard engine, performs the same as a mixture that is 92 parts Isooctane, and eight parts n-heptane.
	www.motorcycle.com /mo/mcnuts/fuelron.html (439 words)

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