ethene


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ethylene

ethylene (ĕthˈəlēnˌ) or ethene (ĕthˈēn), H2C=CH2, a gaseous unsaturated hydrocarbon. It is the simplest alkene. Ethylene is colorless, has a faint odor, and has a slightly sweet taste; it melts at −169.4℃ and boils at −103.8℃. Because of the presence of the double bond in its molecule, ethylene is very reactive. It burns in air with a luminous flame and forms explosive mixtures with pure oxygen. It combines directly with the halogens, e.g., with chlorine to form 1,2-dichloroethane. With hydrogen it forms ethane. Ethylene may be prepared by the dehydration of ethanol with sulfuric acid at about 180℃. It is prepared commercially from natural gas and petroleum, e.g., by cracking and fractional distillation. Ethylene has many uses. It is important in the synthesis of many chemicals that are used to produce plastics and other petrochemical products. It is used in making polyethylene and saran, in the manufacture of ethanol, ethylene oxide, and ethylene glycol, and as an anesthetic. Ethylene was called olefiant gas by early chemists.
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ethene

[′e‚thēn]
(organic chemistry)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Keywords: C4 hydrocarbons, secondary cracking, catalytic pyrolysis, thermal pyrolysis, propene, ethene
van Eekert MHA, Schroder TJ, van Rhee A, Stams AJM, Schraa G, Field JA (2001) Constitutive dechlorination of chlorinated ethenes by a methanol-degrading methanogenic consortium.
This effect can be followed in the produced amounts of ethane and ethene (Fig.
If chlorinated solvents have been identified as contaminants of concern, ethene and chloride levels may be evaluated, as these are by-products of chlorinated solvents and may indicate biodegradation.
Yields of hydrocarbon gases in oil shale samples mixed with transition metal salts Hydrocarbon gas Gas yield, mL/g OS OS-Fe OS-Co OS-Ni OS-Zn Methane 4.01 3.96 3.81 3.81 3.87 Ethane 1.65 1.67 1.51 1.50 1.56 Propane 0.65 0.67 0.60 0.62 0.62 Butane 0.25 0.30 0.28 0.28 0.28 Ethene 0.71 0.73 0.68 0.68 0.67 Propene 0.81 0.94 0.86 0.85 0.85 Butene 0.16 0.23 0.25 0.25 0.23 Total alkanes 6.56 6.60 6.20 6.21 6.32 Total alkenes 1.68 1.89 1.79 1.77 1.74 Total hydrocarbons 8.24 8.49 7.99 7.98 8.06 Ethene/ethane 0.43 0.44 0.45 0.45 0.43 Propene/propane 1.25 1.39 1.44 1.38 1.37 Butene/butane 0.63 0.76 0.88 0.88 0.82 Alkenes/alkanes 0.26 0.29 0.29 0.29 0.28
However, the accumulation of toxic compounds such as cis-dichloroethene (cis-DCE) and vinyl chloride (VC) as incomplete dechlorination products due to the limited distribution of Dehalococcoides, which completely dechlorinate CEs to ethene (ETH), has been reported [2].
Seidel-Morgenstern, Preparation of Ni-MCM-41 by Equilibrium Adsorption - Catalytic Evaluation for the Direct Conversion of Ethene to Propene, Chem.
Armstrong, "Evidence for the involvement of ethene in aerenchyma formation in adventitious roots of rice (Oryza sativa L.)," New Phytologist, vol.
Chemical Pollutant exposure Mixtures [O.sub.3] FA [O.sub.3] 243 245 10 NO 0 0 1 N[O.sub.2] 18 4 7 CO 500 300 300 Peroxyacetyl nitrate 1.3 < 0.2 < 0.2 Formaldehyde 64.2 12.2 12.2 Acetaldehyde 22.1 0 0 Acetone 11.1 0 0 2-Hexanone 17.1 0 0 Glyoxal 11.7 0.6 0.6 Methylglyoxal 15.7 0.8 0.8 Unknown cluster 74.9 9.5 9.5 Estimated total carbonyls 286.0 23.1 23.1 Total organic precursors 2,000 < 20 < 20 Alkanes (23 total) 1,133 Isopentane 173 n-Butane 147 Propane 92 Ethane 77 Alkenes (16 total) 262 Ethene 53 2,3,3-Trimethyl-1 -butene 32 cis-2-Pentene 27 trans-2-Butene 23 Aromatics (13 total) 605 Toluene 138 1,2,4-Trimethylbenezene 112 m-Xylene 74 Benzene 44 CO, carbon monoxide; FA, filtered air; mixtures, multi-pollutant mixtures.
These turned out to be the Dehalococcoides which unlike other dechlorinating bacteria didn't finish acting until they had completely turned TCE and PCE into non-toxic ethene. The genome for several Dehalococcoides species was also sequenced.
A water and ethanol containing petrol blend that contains furfuryl alcohol and ethene oxide is patented [117], but it must be mentioned that these additives are relatively unstable.
In the first stage unlikely to compound 1, four DTA peaks represent the formation of two marked products viz dinitrogen and ethene gas.