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Topic: Heptane

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	Heptane - Wikipedia, the free encyclopedia
		Heptane (also known as dipropyl methane, gettysolve-C or heptyl hydride) is an alkane with the chemical formula H
		Its choice for the zero point of the scale was due to the availability of very high purity n-heptane, unmixed with other isomers of heptane or other alkanes, distilled from the resin of Jeffrey pine.
		Other sources of heptane and octane, produced from crude oil, contain a mixture of different isomers with greatly differing ratings, so do not give a precise zero point.
	en.wikipedia.org /wiki/Heptane (207 words)

	Heptane
		Heptane is a colorless, flammable liquid with a mild, gasoline-like odor.
		Before a worker is placed in a job with a potential for exposure to heptane, a licensed health care professional should evaluate and document the worker's baseline health status with thorough medical, environmental, and occupational histories, a physical examination, and physiologic and laboratory tests appropriate for the anticipated occupational risks.
		Heptane should be stored in a cool, dry, well-ventilated area in tightly sealed containers that are labeled in accordance with OSHA's Hazard Communication Standard [29 CFR 1910.1200].
	www.osha.gov /SLTC/healthguidelines/heptane/recognition.html (3577 words)

	Encyclopedia: Heptane
		A study of injection processes for 15-percent fluorine - 85-percent oxygen and heptane in a 200-pound-thrust rocket...
		The results are compared with oxygen and heptane performance and show the effect, which is qualitatively small, of spontaneous propellant ignition on the relation between injection processes and engine performance.
		The peak is approximated with a triangle and the area is calculated by multiplying the height by its width at half height.
	www.nationmaster.com /encyclopedia/Heptane (1478 words)

	investigations (Site not responding. Last check: 2007-10-19)
		It is also a fact that the next fuel up from heptane, which is octane, is the fuel used by dragsters and other high performance cars due to its high volatility and ability to burn very rapidly and produce a lot of power or energy.
		I think that hexane and heptane will burn too quickly to have much effect on the water and I think that methanol and ethanol will not be the best due to their low energy outputs.
		Although heptane burns for the longest and per mole heats the water the most effectively in reality pentane is a far superior heating fuel.
	atschool.eduweb.co.uk /chs10/invest/a (2720 words)

	Process for producing highly crystalline .alpha.-olefinic polymer - Patent 4329440
		propane, butane, pentane, hexane, heptane or octane), an alicyclic hydrocarbon (e.g.
		The heptane-insoluble polymer is separated from the heptane supernatant liquid by decantation, washed with an excess amount of heptane, washed with hydrochloric acid-methanol for 10 minutes and then dried under a reduced pressure to give a white polymer (76.2 g).
		The heptane-insoluble polymer is separated from the heptane supernatant liquid by decantation, washed with an excess amount of heptane, washed with hydrochloric acid-methanol for 10 minutes and then dried under a reduced pressure to give a white polymer (71.8 g).
	www.freepatentsonline.com /4329440.html (3258 words)

	Solution Formation (Site not responding. Last check: 2007-10-19)
		Heptane, ethanol and cyclohexane are toxic and flammable.
		Heptane, cyclohexane, and ethanol are flammable materials so keep at least 10 ft (3 m) from any source of ignition.
		Heptane and ethanol, and heptane and cyclohexane form the miscible combinations.
	dwb.unl.edu /Chemistry/DoChem/DoChem064.html (973 words)

	SuperchargersOnline.com :: The Mystery of 'Octane' Finally Uncovered
		Heptane, a hydrocarbon with seven carbon atoms, compresses very poorly and spontaneously combusts even under small amounts of compression.
		For this reason, Heptane (which has an octane rating of zero) is the other benchmark fuel used in the octane rating system to determine a fuel's octane rating.
		This is not to say that 87 octane gasoline is made up of 87% octane and 13% heptane, rather that the 87 octane gasoline "knocks" in a laboratory knock engine at the same compression ratio as a fuel composed of 87% octane and 13% heptane.
	www.superchargersonline.com /content.asp?id=105 (859 words)

	2.3 Heptane's execution
		Heptane uses an external tool, Salto, for the assembly analysis.
		The method used must be retargetable, that is, Heptane must not be dependent from one external computation tool.
		Of course, the result must be written in a particular dialect, or transformed by another XSLT sheet, so that Heptane is still independant from the external tool.
	www.irisa.fr /aces/work/heptane-demo/internals/node6.html (395 words)

	Separation of a compound of benzoic acid and aniline by solvent separation and recrystalisation, and a compound of ...
		Separation of a compound of benzoic acid and aniline by solvent separation and recrystalisation, and a compound of Hexane and Heptane by distillation.
		The steam bath that was used in the experiment had a faulty thermostat, and as a result, the temperature of the compound kept rising and falling.
		The refractive index of hexane was 1.3785, and heptane was 1.3839.
	www.coursework.info /i/12381.html (432 words)

	Unit Operations of Chemical Processing
		A total of approximately 220 GPM of heptane rich liquid at 80 PSIG and 319 Deg F is to be produced.
		The unit consists of a hexane flow loop, a heptane flow loop, a mix tank (T-301), a mixture flow loop, a countercurrent tube and shell type heat exchanger (E-401), a flash tank (T-501), an overhead vapor line, and a bottoms liquid line.
		The heptane feed flow loop is outfitted with upstream and downstream pressure indicators (PI-204 and PI-206).
	simtronics.com /catalog/spm/spm0600.htm (1550 words)

	Pentane, Hexane and Heptane
		Pentane, hexane and heptane are injected into separate barometers and their vapor pressures are measured.
		Pentane, hexane and heptane differ in molecular weight due to the differences in the lengths of their carbon chains.
		While heptane, the biggest of the three, depresses the column to only 683 millimeters.
	jchemed.chem.wisc.edu /JCESoft/CCA/CCA5/MAIN/1ORGANIC/ORG03/VAPORES/VAP5/VAP5W1/MOVIE.HTM (180 words)

	[No title] (Site not responding. Last check: 2007-10-19)
		0] heptane may also have utility when administered in combination with an opioid such as morphine, a non-steroid anti-inflammatory agent such as aspirin, a tricyclic antidepressant, or an anticonvulsant such as gabapentin or pregabalin for treating pain and disorders associated with the nicotinic acetylcholine receptor.
		2.0] heptane which is effective to achieve the desired therapeutic response for a particular patient, compositions and mode of administration.
		0] heptane, the route of administration, the severity of the condition being treated and the condition and prior medical history of the patient being treated.
	www.wipo.int /cgi-pct/guest/getbykey5?KEY=04/106342.041209&ELEMENT_SET=DECL (7247 words)

	Molecular Basics (Site not responding. Last check: 2007-10-19)
		Heptane is a flexible molecule and can assume different shapes or conformations.
		With the aid of computers it is easy to generate such pictures of much larger molecules and predict their shapes and sizes.
		The heptane molecule is made up of seven carbon atoms and sixteen hydrogen atoms bonded together in a certain way.
	www.csi.edu /ip/physci/faculty/rex/molbase/molbase.htm (162 words)

	Burning Gasoline Problem
		Using the two densities you give: 683.76 gm / liter (heptane) and 702.5 gm / liter (octane) means that the 18.55 liters (heptane) and 7.95 liters (octane) weigh: 12683.75 gm (heptane) and 5584.9 gm (octane).
		Multiplying each molar heat of combustion by the respective number of mols gives: 145866 k-cal and 63837 k-cal contributed by the two components -- for a total of 209703 k-cal for the sum of the two components in 7 gal of the 70/30 (v/v) blend.
		Isolate each chemical reaction: separate the heptane from the octane and write a balanced chemical equation for both.
	www.newton.dep.anl.gov /askasci/chem03/chem03494.htm (1135 words)

	octane number. The Columbia Encyclopedia, Sixth Edition. 2001-05
		The octane number of a sample of fuel is determined by burning the gasoline in an engine under controlled conditions, e.g., of spark timing, compression, engine speed, and load, until a standard level of knock occurs.
		The engine is next operated on a fuel blended from a form of isooctane that is very resistant to knocking and a form of heptane that knocks very easily.
		When a blend is found that duplicates the knocking intensity of the sample under test, the percentage of isooctane by volume in the blended sample is taken as the octane number of the fuel.
	www.bartleby.com /65/oc/octanenu.html (395 words)

	water (Site not responding. Last check: 2007-10-19)
		The word hydrophobic literally means "fear of water" and appears to have been provoked by the immiscibility of a dispersive solvent such as n-heptane with a very polar solvent such as water.
		However, n-heptane and water are immiscible, not because water molecules repel heptane molecules but because the forces between heptane molecules and the forces between water molecules are much greater than the forces between a heptane molecule and a water molecule.
		n-heptane and water are immiscible, not because water molecules repel heptane molecules, they are immiscible because the forces between two heptane molecules and the forces between two water molecules are much greater than the forces between a heptane molecule and a water molecule.
	www.chromatography-online.org /topics/water.html (1095 words)

	Mix Tank
		The hexane is supplied at 68 Deg F and the heptane is supplied at 100 Deg F. A total of approximately 300 GPM of product mixture at 46 WT % hexane and a temperature of 85 Deg F is to be produced.
		The heptane flow loop is modulated by a flow control valve (V-202) with equal percentage flow characteristics.
		The heptane feed flow loop is outfitted with a composition analyzer that measures weight percent hexane and heptane (AI-303 and AI-304 respectively).
	simtronics.com /catalog/spm/spm0300.htm (690 words)

	2,5,-diazabicyclo[2.2.1]heptane derivatives, their preparation and therapeutic uses - US Patent 6635645 (Site not responding. Last check: 2007-10-19)
		In the compound names, the hyphen "-" forms part of the name, and the underscore line "_" serves merely to indicate the line break; it should be removed if a line break does not occur at that point, and should not be replaced either with a normal hyphen or with a space.
		The residue obtained is purified by chromatography on silica gel, eluting with a 40/60 mixture of ethyl acetate and heptane.
		The reaction medium is allowed to separate by settling and the organic phase is chromatographed on silica gel, eluting with a 75/25 and then 90/10 mixture of ethyl acetate and heptane.
	www.patentstorm.us /patents/6635645.html (4235 words)

	Antibody Staining, Standard Protocol
		Discard the lower aqueous phase and transfer embryos in heptane to a 1.5 ml Eppendorf tube.
		The embryos can be left in the same Eppendorf tube and the heptane removed after each wash. Complete steps 6 and 7 quickly--embryos should not sit in formaldehyde longer than necessary.
		Remove the top heptane layer and the interface, which will contain empty vitelline membranes and embryos which are not devitellinized.
	genetics.med.harvard.edu /~amlab/abstain.html (1059 words)

	Heptane (Site not responding. Last check: 2007-10-19)
		Heptane is alsoknown as Normal Heptane, n-Heptane, dipropylmethane, Gettysolve-C, heptyl hydride, and Skellysolve C
		Heptane is a clear, colorless liquid that is classified as an alkane.
		Direct uses of heptane are a component of formulated products, such as rubber cement, adhesives, laquers, printing inks, dry cleaners and pesticide.
	www.edzone.net /fulton/home/hstaff/salogarg/chem/Heptane/heptane.html (97 words)

	Octane Information And Calculator
		Octane numbers are based on a scale on which isooctane is 100 (minimal knock) and heptane is 0 (bad knock).
		The octane number is determined by comparing the characteristics of a gasoline to isooctane (2,2,4-trimethylpentane) and heptane.
		On the other hand, heptane is given an octane rating of zero.
	www.csgnetwork.com /octaneratecalc.html (837 words)

	Vapor Pressure: Molecular Size - Pentane, Hexane, Heptane (Site not responding. Last check: 2007-10-19)
		Pentane, hexane and heptane differ only in the length of their carbon chain, and have the same type of intermolecular forces, namely dispersion forces.
		Pentane, the smallest of the three, is injected (into the open end of the barometer, it rises to the top) and vaporizes.
		When heptane, the biggest of the three, is injected, the heptane rises to the top and vaporizes.
	jchemed.chem.wisc.edu:8000 /JCESoft/CCA/CCA2/MVHTM/VAPORES5/VAP5W2.HTM (214 words)

	CHEMINFO: n-Heptane
		Saturated aliphatic hydrocarbon / alkane / n-alkane / heptane isomer
		EFFECTS ON BLOOD: Long-term exposure of rubber tire workers to a solvent mixture which included heptane caused some slight blood disorders.(4) No conclusions can be drawn from this report because of the combined exposure.
		Identification of volatile metabolites of inhaled n- heptane in rat urine.
	www.intox.org /databank/documents/chemical/heptane/cie255.htm (1967 words)

	Effects of Asphaltene Aggregation in Model Heptane–Toluene Mixtures on Stability of Water-in-Oil Emulsions
		As part of an ongoing investigation into the stability of water-in-crude oil emulsions, model oils have been utilized to further probe the effects of crude solvency as well as specific resin–asphaltene interactions on emulsion stability.
		These model oils were constructed by dissolving varying amounts of resins and/or asphaltenes in a mixture of heptane and toluene.
		Asphaltenes dissolved in heptol at concentrations of just 0.5% were shown to generate emulsions which were even more stable than those generated from their respective whole crude oils.
	www.che.ncsu.edu /kilpatrick/papers/jcis.196.abs.htm (383 words)

	Octane rating - Wikipedia, the free encyclopedia
		The selection of n-heptane as the zero point of the scale was due to the availability of very high purity n-heptane, not mixed with other isomers of heptane or octane, distilled from the resin of the Jeffrey Pine.
		Other sources of heptane produced from crude oil contain a mixture of different isomers with greatly differing ratings, which would not give a precise zero point.
		This article does not cite its references or sources.
	en.wikipedia.org /wiki/Octane_rating (727 words)

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