
	Where results make sense

Topic: Hydrogen iodide

Related Topics

Iodide

Hydroiodic acid

	Encyclopedia: Hydrogen iodide (Site not responding. Last check: 2007-11-05)
		Liquid hydrogen iodide is decomposed to form hydrogen and iodine in the presence of water using a soluble catalyst.
		Hydrogen iodide will be present in the gas phase in accordance with its equilibrium partial pressure, and there will also be minor amounts of iodine vapor and water vapor present, which are of such a lesser amount that they need not be specifically referred to in order to understand the overall process.
		Hydrogen iodide vapor carrying perhaps a trace of iodine is removed from the top of the distillation column as a stream 51, condensed and repressurized.
	www.nationmaster.com /encyclopedia/Hydrogen-iodide (792 words)

	Azeotropic mixture of perfluoroalkyl iodide and hydrogen fluoride, and method for isolating and purifying ... (Site not responding. Last check: 2007-11-05)
		In these applications, for example, when 1,1,1,2,2-pentafluoroethyl iodide as the raw material is reacted with hydrogen fluoride, or when hydrogen fluoride is produced as a by-product in producing 1,1,1,2,2-pentafluoroethyl iodide, or when 1,1,1,2,2-pentafluoroethyl iodide is produced using hydrogen fluoride, there is formed a mixture containing 1,1,1,2,2-pentafluoroethyl iodide and hydrogen fluoride in a variable ratio.
		After the solubility reached an equilibrium, the proportions of 1,1,1,2,2-pentafluoroethyl iodide and hydrogen fluoride in a phase of 1,1,1,2,2-pentafluoroethyl iodide and a phase of hydrogen fluoride, respectively were determined.
		A layer of 1,1,1,2,2-pentafluoroethyl iodide (600 g) was withdrawn from a heterogeneous mixture of 1,1,1,2,2-pentafluoroethyl iodide and hydrogen fluoride, and was placed into a distillation apparatus made of SUS 316(rectification column with an inner diameter 20 mm and a length 120 cm, packing:SULZER laboratory packing, and number of plates:20).
	www.patentstorm.us /patents/6380148.html (1291 words)

	Hydrogen iodide etch of tin oxide - Patent 4708766
		A source of hydrogen iodide gas and a source of an inert gas are coupled to a mixer, which in turn is coupled to the interior of the vessel, preferably at the top, to form an inlet therein.
		Hydrogen iodide gas source 66 is connected to a flow meter 70 which can be set in order to obtain the preferred volumetric flow of the gas.
		In the plasma etch reactor, all surfaces contacted by the ionized hydrogen iodide must be passivated, or must be constructed of or faced with a relatively impervious material such as silicon dioxide or aluminum (which automatically develops an aluminum oxide coating).
	www.freepatentsonline.com /4708766.html (4259 words)

	Electrochemical conversion of anhydrous hydrogen halide to halogen gas using a cation-transporting membrane - US Patent ... (Site not responding. Last check: 2007-11-05)
		The molecules of the essentially anhydrous hydrogen chloride are oxidized at the anode of the cell to produce essentially dry chlorine gas and protons, which are transported through the membrane of the cell.
		In normal industrial practice for electrolyzing aqueous hydrogen chloride, the practical concentration of hydrogen chloride or chloride ion is ~17% to 22%, whereas the concentration of hydrogen chloride is 100% in a gas of anhydrous hydrogen chloride.
		An advantage of using anhydrous hydrogen chloride in the present invention rather than aqueous hydrogen chloride is that the theoretical cell voltage is lower by at least 0.3 V. This allows the cell to be operated at lower overall cell voltages than cells operated with aqueous hydrogen chloride.
	www.patentstorm.us /patents/5411641.html (8167 words)

	Process for recovery of rhodium values - Patent 4364907
		Disclosed is a process for the recovery of residual rhodium from tar obtained by submitting a rhodium-containing catalyst-tar solution to an extraction using methyl iodide and aqueous hydrogen iodide, thereby recovering catalyst values in the aqueous phase and tar containing residual rhodium in the methyl iodide phase.
		The amount of hydrogen iodide required will vary depending on such factors as the amount of lithium acetate present and the temperatures to which the aqueous phase is heated.
		The remaining aqueous solution of hydrogen iodide and rhodium, lithium and iodine values in water and acetic acid is vacuum distilled to remove most of the water, e.g., 90%.
	www.freepatentsonline.com /4364907.html (3030 words)

	Hydrogen (Site not responding. Last check: 2007-11-05)
		Hydrogen could be used a lot more in the future if enough funding is given to use a hydrogen based society.
		Hydrogen is the first element on the periodic table.
		Hydrogen was discovered in 1766 by Henry Cavendish in England.
	www.mvschools.org /ms/projects/html/black/hydrogen.htm (395 words)

	Hydrogen iodide decomposition - Patent 4410505
		It was found that hydrogen iodide could be economically decomposed in liquid form using a supported catalyst, such as ruthenium on a titania substrate or platinum on a barium sulphate substrate, as set forth in U.S. Pat.
		The flowsheet represents the carrying out of the thermal decomposition of hydrogen iodide as it might occur in combination with an overall water-splitting process, such as that mentioned hereinbefore, and reference is sometimes made to that overall process.
		Of course, because over 85 mole percent of the hydrogen iodide in the stream 23 migrates to the rising dry phase, the total molar amount of the exit stream 39 far exceeds that of the exit stream 37 that is recycled to the reactor 13.
	www.freepatentsonline.com /4410505.html (4436 words)

	The Preparation of Anhydrous Hydrogen Iodide - [www.rhodium.ws]
		In order to prepare chloroform solutions of anhydrous hydrogen iodide needed in the synthesis of 2-butene it was necessary to develop a process by which the desired gas could be obtained readily in large quantity.
		However, since anhydrous hydrogen iodide in the gaseous state and in solution, for example, in chloroform, is easily oxidized by air and rapidly decomposes when exposed to light, it was necessary to fill the apparatus with nitrogen for the first run and to protect it from light.
		Its solubility in the calcium iodide solution is practically nil since the amount at the end of successive runs increased in proportion to the total hydrogen iodide produced.
	www.erowid.org /archive/rhodium/chemistry/anhydrous.hi.html (701 words)

	WNA \| Annual Symposium 2003 \| Use of the Modular Helium Reactor for Hydrogen Production (Site not responding. Last check: 2007-11-05)
		Hydrogen produced from water using nuclear energy can be one of the sources, and would avoid use of fossil fuels and greenhouse gas emissions.
		Sulphuric acid and hydrogen iodide are formed in the exothermic reaction of H2O, SO2 and I2 (1) and the hydrogen is generated in the decomposition of hydrogen iodide (3).
		The cost of producing hydrogen from natural gas by steam reformation of methane depends strongly on the cost of the natural gas, which is used for both the feedstock and the energy source.
	www.world-nuclear.org /sym/2003/schultz.htm (2113 words)

	Preparation of Hydriodic Acid (HI)
		Hydrogen iodide may be conveniently prepared by allowing a solution of two parts of iodine in one part of hydriodic acid (density 1.7), to drop onto an excess of red phosphorous.
		All these procedures had one additional and important shortcoming in the context of the proposed chemistry, namely, that traces of iodine, residual during the preparation of the hydrogen iodide, were not readily removable from the resulting solutions produced by passing the gas stream into glacial acetic acid.
		Crude hydrogen iodide gas generated as the reaction went on was introduced into a 10% sodium hydroxide aqueous solution of 1 liter to absorb the whole amount thereof.
	www.erowid.org /archive/rhodium/chemistry/hydriodic.html (1167 words)

	Hydrogen iodide - Wikipedia, the free encyclopedia (Site not responding. Last check: 2007-11-05)
		Hydrogen iodide is a compound of hydrogen and iodine.
		It is produced via catalytic action of Red Phosphorus upon Iodine Chrystals in the presence of water.
		The Hydrogen Iodide which does not dissolve into the water to form hydroiodic acid takes the form of a pungent gas.
	en.wikipedia.org /wiki/Hydrogen_iodide (94 words)

	Iodide - Wikipedia, the free encyclopedia
		An iodide ion is an iodine atom with a -1 (negative one) charge.
		Compounds with iodine in formal oxidation state -1 are called iodides.
		This can include ionic compounds such as caesium iodide or covalent compounds such as carbon tetraiodide.
	en.wikipedia.org /wiki/Iodide (87 words)

	Hydrogen halides as acids
		Hydrogen fluoride can be made in exactly the same way as hydrogen chloride using concentrated sulphuric acid, but hydrogen bromide and hydrogen iodide can't.
		The familiar steamy fumes of hydrogen chloride in moist air are caused by the hydrogen chloride reacting with water vapour in the air to produce a fog of concentrated hydrochloric acid.
		A proton is donated from the hydrogen chloride to one of the lone pairs on a water molecule.
	www.chemguide.co.uk /inorganic/group7/acidityhx.html (2131 words)

	MSN Encarta - Search Results - hydrogen iodide
		Hydrogen, chemical element that exists as a gas at room temperature.
		Hydrogen gas is odorless, tasteless, colorless, and highly flammable.
		Hydrogen Bomb, also known as H-bomb or thermonuclear bomb, nuclear weapon in which a thermonuclear fusion reaction takes place among heavy isotopes of...
	encarta.msn.com /hydrogen%2biodide.html (129 words)

	Physics Today December 2004 - Articles: The Hydrogen Economy
		Hydrogen is abundant and generously distributed throughout the world without regard for national boundaries; using it to create a hydrogen economy—a future energy system based on hydrogen and electricity—only requires technology, not political access.
		Hydrogen can be stored in pressurized gas containers or as a liquid in cryogenic containers, but not in densities that would allow for practical applications—driving a car up to 500 kilometers on a single tank, for example.
		Hydrogen can be converted to electricity in fuel cells, but the production cost of prototype fuel cells remains high: $3000 per kilowatt of power produced for prototype fuel cells (mass production could reduce this cost by a factor of 10 or more), compared with $30 per kilowatt for gasoline engines.
	www.physicstoday.org /vol-57/iss-12/p39.html (4551 words)

	Spectrum Laboratories : Chemical Fact Sheet - Cas # 10034852
		Hydrogen iodide, anhydrous is forbidden for transport on passenger and cargo aircraft.
		This method is applicable to iodide concentration of 50 to 6,000 ug/l and is capable of determining iodide in the presence of iodine.
		Iodide can be determined by using its ability to catalyze the reduction of ceric ions by arsenious acid.
	www.speclab.com /compound/10034852.htm (1664 words)

	Resistoflex: Anhydrous Hydrogen Iodide and Hydriodic Acid
		Anhydrous hydrogen iodide is a pungent, colorless, corrosive gas at room temperature and atmospheric pressure.
		A check valve, trap or vacuum break should be in the delivery line to block suck-back of foreign material which could cause dangerous pressure to develop in the cylinder.
		Anhydrous HI is used primarily in the manufacture of hydriodic acid, in the preparation of organic and inorganic iodides, and as a reducing agent.
	www.resistoflex.com /iodide.htm (258 words)

	Chemical Equilibria: Basic Concepts (Site not responding. Last check: 2007-11-05)
		As the reaction progresses, the concentrations of iodine and hydrogen decrease as they are consumed while the concentration of hydrogen iodide increases as it is formed.
		This behavior is a results of the back reaction in which hydrogen iodide reacts to form iodine and hydrogen.
		The same is true for hydrogen and hydrogen iodide.
	www.chm.davidson.edu /ChemistryApplets/equilibria/BasicConcepts.html (402 words)

	Hydrogen iodide -- Britannica Student Encyclopedia
		For example, a hydrogen gas molecule, H2, reacts with a gaseous iodine molecule, I2, to give hydrogen iodide molecules, HI, according to the equation H2 + I2 = 2HI.
		It is believed to have formed, with helium, all of the heavier elements and is estimated to compose three quarters of the mass of the universe.
		Information on this medicine that is used to treat “chronic open-angle glaucoma, a partial loss of vision or blindness resulting from a gradual increase in pressure of fluid in the eye.” Discusses the dosage, possible side effects, and precautions.
	www.britannica.com /ebi/article-9326938 (733 words)

	CHAPTER IV
		In order for a molecule of hydrogen and a molecule of iodine to combine to form hydrogen iodide, the two molecules must come into contact with each other (contact meaning approach within a certain distance so that bonding forces can play a role).
		If the number of hydrogens is doubled, one would expect the formation of hydrogen iodide to occur twice as fast.
		On the other hand, if the number of iodine molecules was increased to 10, the rate at which any one of the iodine molecules forms hydrogen iodide would be unchanged, but the overall rate of hydrogen iodide formation would increase by a factor of 10.
	www.ecs.umass.edu /cee/reckhow/courses/572/572bk4/572BK4.html (2084 words)

	Hydrogen Iodide - Reciprocal Net Common Molecules (Site not responding. Last check: 2007-11-05)
		Hydrogen Iodide is used for its expectorant action in chronic bronchitis and bronchial asthma.
		Explanation: Hydrogen Iodide is a colorless, nonflammable, and corrosive gas with a penetrating and suffocating odor.
		Hydrogen Iodide is highly toxic, and mostly attacks mucous membranes and eyes.
	www.reciprocalnet.org /recipnet/showsample.jsp?sampleId=27344852 (153 words)

	Williamson
		It consisted in replacing the hydrogen first by potassium and acting upon the compound thus formed by the chloride or iodide of the carburetted hydrogen which was to be introduced in the place of that hydrogen.
		Iodide of potassium was readily formed on the application of a gentle heat, and the desired substitution was effected; but, to my astonishment, the compound thus formed had none of the properties of an alcohol--it was nothing else than common aether, C
		By acting upon the potassium-alcohol in like manner by iodide of amyle, I effected a similar substitution of the elements of that carburetted hydrogen in the place of the hydrogen of alcohol, and obtained an aether boiling at 111°C., having the composition C
	web.lemoyne.edu /~giunta/williamson.html (1759 words)

	Transport and the Hydrogen Economy (Site not responding. Last check: 2007-11-05)
		Hydrogen is already a significant chemical product, chiefly used in making nitrogen fertilisers and, increasingly, to convert low-grade crude oils into transport fuels*.
		Hydrogen can also be used for stand-alone small-scale stationary generating plants using fuel cells - where higher temperature operation (eg of solid oxide fuel cells) and hydrogen storage may be less of a problem or where it is reticulated like natural gas.
		The initial use of hydrogen for transport is likely to be municipal bus and truck fleets, and prototypes are already on the road in many parts of the world.
	www.uic.com.au /nip73.htm (2816 words)

	[No title]
		Similarly, the concentrations of hydrogen and iodine are large at the start of the reaction but decrease, rapidly at first, and then more slowly.
		If this reaction were not reversible, the concentrations of hydrogen and iodine would have continued to decrease and the concentration of hydrogen iodide to increase.
		Notice that the value of the equilibrium constant is the same, regardless of whether the initial materials were hydrogen and iodine or the hydrogen iodide molecule or a combination of all and whether the components were present in equal or different concentrations.
	genchem.chem.wisc.edu /sstutorial/Text13/Tx134/tx134.html (1064 words)

	Recovery of hydrogen iodide - Patent 4396591
		A further improvement was made with respect to recovery of hydrogen iodide which utilized the high-pressure creation of two separate liquid phases when compositions within certain precentage ranges of HI, I.sub.2 and H.sub.2 O were present, which process is described in detail in co-pending U.S. application Ser.
		The heavier of the two phases, sometimes referred to hereinafter as the first phase, is the hydrogen iodide-bearing phase, whereas the second phase is the lighter or less dense of the two phases and is the H.sub.2 SO.sub.4 -bearing phase.
		The gaseous hydrogen stream is routed to a scrubber 25 where a minimal amount of water is used to remove the residual HI to produce a clean hydrogen product stream 27.
	www.freepatentsonline.com /4396591.html (3200 words)

	Untitled
		Note: Potassium iodide is often contaminated by small amounts of iodine, in which case note any change in the intensity of color upon adding the bromine water.
		The hydrogen halides are gases, and their preparation illustrates a general laboratory method for the preparation of volatile acids: add a non-volatile acid (e.g.
		Explain why it is possible to prepare pure hydrogen chloride but not pure hydrogen bromide and, especially, hydrogen iodide by a reaction of concentrated sulfuric acid on the appropriate metal halide salt.
	bouman.chem.georgetown.edu /general/halogen.htm (2034 words)

	alkenes and hydrogen halides
		A hydrogen atom joins to one of the carbon atoms originally in the double bond, and a halogen atom to the other.
		Hydrogen fluoride reacts much more slowly than the other three, and is normally ignored in talking about these reactions.
		Because it is difficult to break the bond between the hydrogen and the fluorine, the addition of HF is bound to be slow.
	www.chemguide.co.uk /organicprops/alkenes/hhal.html (1403 words)

Try your search on: Qwika (all wikis)