CHEMISTRY DATA BOOK October 2011
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Physical Mechanism of Superconductivity
Physical Mechanism of Superconductivity Part 1 – High Tc Superconductors Xue-Shu Zhao, Yu-Ru Ge, Xin Zhao, Hong Zhao ABSTRACT The physical mechanism of superconductivity is proposed on the basis of carrier-induced dynamic strain effect. By this new model, superconducting state consists of the dynamic bound state of superconducting electrons, which is formed by the high-energy nonbonding electrons through dynamic interaction with their surrounding lattice to trap themselves into the three - dimensional potential wells lying in energy at above the Fermi level of the material. The binding energy of superconducting electrons dominates the superconducting transition temperature in the corresponding material. Under an electric field, superconducting electrons move coherently with lattice distortion wave and periodically exchange their excitation energy with chain lattice, that is, the superconducting electrons transfer periodically between their dynamic bound state and conducting state, so the superconducting electrons cannot be scattered by the chain lattice, and supercurrent persists in time. Thus, the intrinsic feature of superconductivity is to generate an oscillating current under a dc voltage. The wave length of an oscillating current equals the coherence length of superconducting electrons. The coherence lengths in cuprates must have the value equal to an even number times the lattice constant. A superconducting material must simultaneously satisfy the following three criteria required by superconductivity. First, the superconducting materials must possess high – energy nonbonding electrons with the certain concentrations required by their coherence lengths. Second, there must exist three – dimensional potential wells lying in energy at above the Fermi level of the material. Finally, the band structure of a superconducting material should have a widely dispersive antibonding band, which crosses the Fermi level and runs over the height of the potential wells to ensure the normal state of the material being metallic. -
Isobutylene Polymer Having Unsaturated Group and Preparation
Europaisches Patentamt European Patent Office Office europeen des brevets (11) EP 0 452 875 B2 (12) NEW EUROPEAN PATENT SPECIFICATION (45) Date of publication and mention (51) |nt CI.6: C08F 10/10, C08F 2/42 of the opposition decision: 18.08.1999 Bulletin 1999/33 (45) Mention of the grant of the patent: 09.08.1995 Bulletin 1995/32 (21) Application number: 91106042.4 (22) Date of filing: 16.04.1991 (54) Isobutylene polymer having unsaturated group and preparation thereof Isobutylenpolymer mit ungesattigter Gruppe und seine Herstellung Polymere de I'isobutylene ayant un groupe insature et sa preparation (84) Designated Contracting States: (74) Representative: BE CH DE ES FR GB IT LI NL SE Hansen, Bernd, Dr. Dipl.-Chem. et al Hoffmann Eitle, (30) Priority: 16.04.1990 JP 10102990 Patent- und Rechtsanwalte, 29.11.1990 JP 33636490 Postfach 81 04 20 81904 Miinchen (DE) (43) Date of publication of application: 23.10.1991 Bulletin 1991/43 (56) References cited: EP-A- 0 265 053 EP-B- 0 322 241 (73) Proprietor: Kanegafuchi Chemical Industry Co., CA-A- 467 049 GB-A- 1 059 580 Ltd. US-A- 4 31 6 973 US-A- 4 327 201 Kita-ku Osaka-shi Osaka-fu (JP) US- A- 4 524 1 88 US-A- 4 758 63 1 US-A- 4 929 683 (72) Inventors: • Noda, Koji Remarks: Kobe-shi, Hyogo-ken (JP) The file contains technical information submitted • Fujisawa, Hiroshi after the application was filed and not included in this Kobe-shi, Hyogo-ken (JP) specification • Yonezawa, Kazuya Kobe-shi, Hyogo-ken (JP) CM DO 10 Is- 00 CM IO ^- o a. -
Ammonia, Anhydrous Ama
AMMONIA, ANHYDROUS AMA CAUTIONARY RESPONSE INFORMATION 4. FIRE HAZARDS 7. SHIPPING INFORMATION 4.1 Flash Point: 7.1 Grades of Purity: Commercial, industrial, Common Synonyms Liquefied compressed Colorless Ammonia odor Not flammable under conditions likely to refrigeration, electronic, and metaflurgical Liquid ammonia gas be encountered grades all have purity greater than 99.5% 4.2 Flammable Limits in Air: 15.50%- 7.2 Storage Temperature: Ambient for pressurized 27.00% ammonia; low temperature for ammonia at Floats and boils on water. Poisonous, visible vapor cloud is produced. 4.3 Fire Extinguishing Agents: Stop flow of atmospheric pressure Avoid contact with liquid and vapor. Keep people away. gas or liquid. Let fire burn. 7.3 Inert Atmosphere: No requirement Wear goggles, self-contained breathing apparatus, and rubber overclothing (including gloves). 4.4 Fire Extinguishing Agents Not to Be 7.4 Venting: Safety relief 250 psi for ammonia Stop discharge if possible. Used: None under pressure. Pressure-vacuum for Stay upwind and use water spray to ``knock down'' vapor. 4.5 Special Hazards of Combustion ammonia at atmospheric pressure. Call fire department. Products: Not pertinent Isolate and remove discharged material. 7.5 IMO Pollution Category: Currently not available 4.6 Behavior in Fire: Not pertinent Notify local health and pollution control agencies. 7.6 Ship Type: 2 4.7 Auto Ignition Temperature: 1204°F Protect water intakes. 7.7 Barge Hull Type: 2 4.8 Electrical Hazards: Class I, Group D Combustible. 4.9 Burning Rate: 1 mm/min. Fire 8. HAZARD CLASSIFICATIONS Wear goggles, self-contained breathing apparatus, and rubber over- 4.10 Adiabatic Flame Temperature: Currently clothing (including gloves). -
HEATS of COMBUSTION of DIAMOND and of GRAPHITE by Ralph S
r---------------___........,._ . _____~ ~_ U. S. DEPARTMENT OF COMMERCE NATIONAL BUREAU OF STANDARDS RESEARCH PAPER RP1140 Part of Journal of Research of the }.{ational Bureau of Standards, Volume 21, October 1938 HEATS OF COMBUSTION OF DIAMOND AND OF GRAPHITE By Ralph S. Jessup ABSTRACT Measurements were made of the heats of combustion of one artificial graphite, two natural graphites, and two samples of diamond. The bomb calorimeter used was calibrated electrically and by means of benzoic acid. The amount of reaction in each combustion experiment was determined from the mass of carbon dioxide formed. This method of determining the amount of reaction automatically eliminates the effect of unburned carbon and of some impurities. It was found, however, that results for different samples did not agree unless the samples were purified. Two methods of purification were used: (a) heating in vacuo to 1,800° C and (b) treatment with hydrochloric and hydrofluoric acids and subsequent heating in vacuo to 200° C to remove traces of the acids. Both methods yielded graphite containing only small amounts of impurities. The mean value obtained for the heat of combustion (-/lH) of the purified graphites in oxygen at 25° C and a constant pressure of 1 atmosphere to form gaseous carbon dioxide at the same temperature and pressure was 393.396 international kilojoules per mole (44.010 g of CO2). The maximum deviation of the mean value for anyone of the purified samples from this value was 0.021 percent. The two samples of diamond, purified by treatment with aqueous hydrochloric and hydrofluoric acids and subsequently heated in vacuo to about 570° C, had average particle sizes of 2.5 I'- and 39.5 1'-, respectively, and yielded the following respective mean values for the heat of combustion (-/lH) at 25° C and 1 atmos phere, in oxygen to form gaseous carbon dioxide: 395.771 and 395.287 interna tional kilojoules per mole. -
Model Vulcanization Systems for Butyl Rubber and Halobutyl Rubber Manual
Exxon™ butyl and halobutyl rubber Model vulcanization systems for butyl rubber and halobutyl rubber manual Country name(s) 2 - Model vulcanization systems for butyl rubber and halobutyl rubber manual Model vulcanization systems for butyl rubber and halobutyl rubber manual - 3 Abstract The vulcanization of isobutylene-co-isoprene rubber (IIR), brominated isobutylene-co-isoprene rubber (BIIR), chlorinated isobutylene-co-isoprene rubber (CIIR), and brominated isobutylene-co-para-methylstyrene elastomer (BIMSM) differs from that of general-purpose rubbers (GPR). Butyl rubber has approximately 2% unsaturation in the backbone. Halobutyl rubber (BIIR and CIIR) incorporates the butyl backbone with either bromine or chlorine, which significantly increases the chemical reactivity of the isoprenyl units located in the butyl backbone. Similarly, in BIMSM the bromine atom is bonded to the para-methylstyrene (PMS) group, thus affording the completely saturated polymer backbone a site of chemical reactivity. Utilization of the unique attributes of butyl rubber and halobutyl rubbers with their minimal backbone unsaturation and of BIMSM elastomers with no backbone unsaturation is found in many areas of industry. These properties are excellent vapor impermeation, resistance to heat degradation, and improved chemical resistance as compared to general-purpose rubbers. However, this low amount of reactivity requires special consideration to vulcanize these isobutylene-based polymers. The type of vulcanization system selected is a function of the composite structure in which it is used, and the cured product performance requirements. Therefore, vulcanization systems vary and may include an accelerator package along with resins, zinc oxide, zinc oxide and sulfur, and quinoid systems. This review will discuss the types and selection of appropriate vulcanization systems for isobutylene-based elastomers. -
Thermochemistry of Heteroatomic Compounds:Calculation of the Heat
Open Journal of Physical Chemistry, 2011, 1, 1-5 doi:10.4236/ojpc.2011.11001 Published Online May 2011 (http://www.SciRP.org/journal/ojpc) Thermochemistry of Heteroatomic Compounds: Calculation of the heat of Combustion and the heat of Formation of some Bioorganic Molecules with Different Hydrophenanthrene Rows Vitaly V. Ovchinnikov Tupolev Kazan State Technical University, St- K. Marks 10, 420111 Kazan, Russian Federation E-mail: [email protected] Received March 23rd, 2011; revised April 10th, 2011; accepted May 10th, 2011. Abstract On the basis of the known experimental heats of combustions of the seventeen alkanes in condensed state, the general equation comb HifNg has been deduced, in which i and f are correlation coefficients, N and g are a numbers of valence electrons and lone electron pairs of heteroatoms in molecule. The pre- sented dependence has been used for the calculation of the heats of combustion of thirteen organic molecules with biochemical properties: holestan, cholesterol, methyl-cholesterol, ergosterol, vitamin-D2, estradiol, an- drostenone, testosterone, androstanedione, morphine, morphinanone, codeine and pentasozine. It is noted that good convergence was obtained within the limits of errors of thermochemical experiments known in the literature and calculations of the heats of combustion for some of them were conducted. With the application of Hess law and the heats of vaporization vap H , which has been calculated with the use of a topological 1 s solvation index of the first order x , the heats of formation f H for condensed and gaseous phases were calculated for the listed bioorganic molecules. Keywords: Alkanes, Biochemical Molecules, the Heat of Combustion, Heat of Formation, Heat of Vaporiza- tion, Topological Solvation Index 1. -
FID Vs PID: the Great Debate
5/5/2017 FID vs PID: The Great Debate 2017 Geotechnical, GeoEnvironmental, and Geophysical Technology Transfer April 11, 2017 Raleigh, NC Why is it Important? As consultants, we are expected to produce data that is Reliable Repeatable Representative Defensible We can only meet these criteria if we understand the instruments we use and their limitations 1 5/5/2017 PID=Photo Ionization Detector Non-destructive to the sample Responds to functional groups Can operate in non-oxygen atmosphere Does not respond to methane Affected by high humidity FID=Flame Ionization Detector Destructive to the sample Responds to carbon chain length Must have oxygen to operate Responds to methane Not affected by high humidity 2 5/5/2017 Combination FID/PID TVA 1000B Main Concepts Ionization Energy Minimum amount of energy required to remove an electron from an atom or molecule in a gaseous state Response Factors The response factor is a calculated number provided by the instrument manufacturer for each compound, which is used to calculate the actual concentration of said compound in relation to the calibration gas. 3 5/5/2017 Ionization Energy Basis for FID/PID operations and measurement Measurements are in electron volts (eV) Ionization in a PID Energy source for ionization with PID is an ultraviolet light Three UV lamp energies are used: 9.5 eV, 10.6 eV, and 11.7 eV The higher the lamp energy, the greater the number of chemicals that can be detected. Detection range of 0.1 to 10,000 ppm 4 5/5/2017 Ionization in a FID Energy source for ionization -
Thermal Properties of Petroleum Products
UNITED STATES DEPARTMENT OF COMMERCE BUREAU OF STANDARDS THERMAL PROPERTIES OF PETROLEUM PRODUCTS MISCELLANEOUS PUBLICATION OF THE BUREAU OF STANDARDS, No. 97 UNITED STATES DEPARTMENT OF COMMERCE R. P. LAMONT, Secretary BUREAU OF STANDARDS GEORGE K. BURGESS, Director MISCELLANEOUS PUBLICATION No. 97 THERMAL PROPERTIES OF PETROLEUM PRODUCTS NOVEMBER 9, 1929 UNITED STATES GOVERNMENT PRINTING OFFICE WASHINGTON : 1929 F<ir isale by tfttf^uperintendent of Dotmrtients, Washington, D. C. - - - Price IS cants THERMAL PROPERTIES OF PETROLEUM PRODUCTS By C. S. Cragoe ABSTRACT Various thermal properties of petroleum products are given in numerous tables which embody the results of a critical study of the data in the literature, together with unpublished data obtained at the Bureau of Standards. The tables contain what appear to be the most reliable values at present available. The experimental basis for each table, and the agreement of the tabulated values with experimental results, are given. Accompanying each table is a statement regarding the esti- mated accuracy of the data and a practical example of the use of the data. The tables have been prepared in forms convenient for use in engineering. CONTENTS Page I. Introduction 1 II. Fundamental units and constants 2 III. Thermal expansion t 4 1. Thermal expansion of petroleum asphalts and fluxes 6 2. Thermal expansion of volatile petroleum liquids 8 3. Thermal expansion of gasoline-benzol mixtures 10 IV. Heats of combustion : 14 1. Heats of combustion of crude oils, fuel oils, and kerosenes 16 2. Heats of combustion of volatile petroleum products 18 3. Heats of combustion of gasoline-benzol mixtures 20 V. -
Chapter Two Properties of Ammonia
Chapter Two Properties of Ammonia Physical Properties General Anhydrous ammonia exists as either a colorless gas, colorless liquid, or white solid, depending on its pressure and temperature. In nearly all commonly encountered situations, it exists as either a liquid or a gas. The gas is less dense than air and the liquid is less dense than water at standard conditions. Ammonia gas (vapor) diffuses readily in air and the liquid is highly soluble in water with an accompanying release of heat. Ammonia exhibits classical saturation relationships whereby pressure and temperature are directly related so long as both the vapor and liquid phase are present. It does have a critical pressure and temperature. At atmospheric pressure, a closed container of ammonia vapor and liquid will be in equilibrium at a temperature of –28°F [–33°C]. It should be noted however that if liquid ammonia is spilled or released to the atmosphere at normal temperatures, the resultant pool of boiling liquid will be significantly colder than –28°F due to the law of partial pressures (the partial pressure of the ammonia vapor in the air near the liquid surface will be less than atmospheric pressure). The following table provides some of the important physical properties of ammonia. TABLE 2-1 Physical Properties of Ammonia Property Condition Value (IP) Value (SI) Molecular Weight 17.03 17.03 Color None None Physical State Room Temp Gas Gas Freezing Point P=1 atm –108°F –78°C Boiling Point P=1 atm –28.1°F –33.3°C Critical Pressure 1657 psia 11,410 kPa Critical Temp 271°F -
4. Production, Import/Export, Use, and Disposal
METHYL tert-BUTYL ETHER 163 4. PRODUCTION, IMPORT/EXPORT, USE, AND DISPOSAL During the 1970s EPA moved to phase out leaded gasolines and to reduce the levels of air pollution from pre- or post-combustion vehicular emissions. This conversion to unleaded fuels tended to reduce the octane ratings. Additives such as benzene or toluene could increase octane levels, but these aromatic volatile organic compounds could lead to serious air pollution problems due to their known toxic properties. Various highly oxygenated blending agents, including several ethers and alcohols, can boost the octane of unleaded gasoline and, since they are less toxic, can mitigate many of the air pollution concerns. MTBE is one such product used in Reformulated Gasoline (RFG). Some states started requiring the seasonal use of RFGs in the 197Os, and this became a requirement for many parts of the country under provisions of the 1990 Clean Air Act. This requirement led to a rapid expansion in the production and use of MTBE starting in the late 1980s. 4.1 PRODUCTION Typical production processes use feedstocks like isobutylene, often in combination with methanol, in adiabatic fixed reactors. The isobutylene and methanol react in the presence of ion-exchange resin catalysts at medium pressures and temperatures. Highly volatile by-products are removed through distillation, and methanol is reclaimed using water washing or molecular sieves. In a variant of this basic technology called reaction distillation, the catalysis and distillation steps take place simultaneously (Shanely 1990). There are numerous variants in these manufacturing processes, the details of which are protected under patents or license agreements (Lorenzetti 1994; Rhodes 1991). -
Minimizing Isobutylene Emissions from Large Scale Tert-Butoxycarbonyl Deprotections
Organic Process Research & Development 2005, 9, 39−44 Minimizing Isobutylene Emissions from Large Scale tert-Butoxycarbonyl Deprotections Eric L. Dias,* Kevin W. Hettenbach, and David J. am Ende Process Safety and Reaction Engineering Laboratory, Pfizer Global Research and DeVelopment, Eastern Point Road, Groton, Connecticut 06340 Abstract: with scavengers1,7,8 such as thiophenol1,7 to form an unre- Isobutylene off-gas amounts liberated during the methane- active byproduct, 3a; however, in an industrial setting, this sulfonic acid-catalyzed deprotection of N-BOC-pyrrolidine in can be prohibitive in terms of cost, worker exposure, and THF, methanol, ethanol, 2-propanol, toluene, and dichlo- added purification. romethane were measured using on-line gas-phase mass spec- In the absence of a powerful scavenger, 1 can be trapped troscopy. While one full equivalent of isobutylene was released in other manners. When trifluoroacetic acid is used, reaction as an off-gas when THF was used as the reaction solvent, with the conjugate base can form the tert-butyl trifluoroac- emissions were reduced by 65-95% in other solvents. In alcohol etate ester, 3b;6,7,8a,9 however this typically will not occur solvents, the corresponding alkyl tert-butyl ethers are formed with methanesulfonic or other nonnucleophilic strong acids. as byproducts of the reaction as expected. In dichloromethane It has also been noted that water and alcohols will encourage and toluene, oligomers of isobutylene can be formed under the formation of tert-butyl alcohol2a,11b or the corresponding alkyl reaction conditions. These results provided the basis for tert-butyl ethers, 3c,10,11 which may provide a practical developing an effective acid/toluene scrubber for isobutylene approach to reducing isobutylene emissions but will be that was successfully employed on the pilot plant scale. -
Superconductivity
Superconductivity • Superconductivity is a phenomenon in which the resistance of the material to the electric current flow is zero. • Kamerlingh Onnes made the first discovery of the phenomenon in 1911 in mercury (Hg). • Superconductivity is not relatable to periodic table, such as atomic number, atomic weight, electro-negativity, ionization potential etc. • In fact, superconductivity does not even correlate with normal conductivity. In some cases, a superconducting compound may be formed from non- superconducting elements. 2 1 Critical Temperature • The quest for a near-roomtemperature superconductor goes on, with many scientists around the world trying different materials, or synthesizing them, to raise Tc even higher. • Silver, gold and copper do not show conductivity at low temperature, resistivity is limited by scattering and crystal defects. 3 Critical Temperature 4 2 Meissner Effect • A superconductor below Tc expels all the magnetic field from the bulk of the sample perfectly diamagnetic substance Meissner effect. • Below Tc a superconductor is a perfectly diamagnetic substance (χm = −1). • A superconductor with little or no magnetic field within it is in the Meissner state. 5 Levitating Magnet • The “no magnetic field inside a superconductor” levitates a magnet over a superconductor. • A magnet levitating above a superconductor immersed in liquid nitrogen (77 K). 6 3 Critical Field vs. Temperature 7 Penetration Depth • The field at a distance x from the surface: = − : Penetration depth • At the critical temperature, the penetration length is infinite and any magnetic field can penetrate the sample and destroy the superconducting state. • Near absolute zero of temperature, however, typical penetration depths are 10–100 nm. 8 4 Type I Superconductors • Meissner state breaks down abruptly.