B
hydroperoxyl radical
Conditions | Yield |
---|---|
With perchloric acid; oxygen In acetonitrile Kinetics; | A 100% B n/a |
carbon disulfide
dihydrogen peroxide
oxygen
A
sulfur dioxide
B
hydroperoxyl radical
Conditions | Yield |
---|---|
In gas Kinetics; byproducts: HS; other Radiation; H2O2 is photolysed at 266 nm (Nd:YAG laser) in a flow reactor, addn. of CS2 (NO) and O2 (N2); HO2 yield measurement by LMR (laser magnetic resonance), SO2 yield measurement by CIMS (chemical ionization mass spectometry); | A 90% B 95% |
Conditions | Yield |
---|---|
With synthetic air; oxygen In gaseous matrix Kinetics; C2H4, CO and synthetic air mixture addn. into O3/O2 flow; | 66% |
Conditions | Yield |
---|---|
With synthetic air; oxygen In gaseous matrix Kinetics; byproducts: hydroxyethylperoxy radical; C2H4 (1-3 ml/min) and synthetic air (3 ml/min) mixture addn. into O3/O2 flow; | A 20% B 39% |
hydroxyl
chlorine monoxide
A
hydrogenchloride
C
oxygen
D
hydroperoxyl radical
Conditions | Yield |
---|---|
In gas Kinetics; between 218 and 298 K, OH source: F + H2O or H + NO2, ClO source: Cl + O3, reaction carried out in a discharge-flow system; | A 9% B n/a C n/a D n/a |
In gaseous matrix Kinetics; carrier gas: He; hydroxyl radicals were prepared by the reaction between H and NO2; ClO radicals were prepared by the reaction between O3 an Cl; resonance-fluorescence measurements; |
Conditions | Yield |
---|---|
In neat (no solvent) Kinetics; byproducts: C2H4, C2H5O2; Irradiation (UV/VIS); reaction of O2 with C2H5 radicals formed by flash-light photolysis (22 °C, 5-100 Torr total pressure); 99.9% of C2H5 reacted with formation of C2H5O2; rate constant;; | 0.1% |
In neat (no solvent) Kinetics; byproducts: C2H4; reaction of C2H5 radicals with O2 at T<320 °C; mechanism;; |
Conditions | Yield |
---|---|
In gas Kinetics; CH4-O2 reaction at 1100 °C and total pressure of 10 Torr; HO2 decay (1. order);; mass spectroscopy;; | |
In neat (no solvent) CH4-O2 flames (12 Torr);; mass spectroscopy; assignment to HO2 is doubtful;; | |
In neat (no solvent) CH4-O2 flames (70 Torr);; mass spectroscopy;; | |
In neat (no solvent) byproducts: CH3, H2O2; reaction of 5 Torr CH4 with 3 Torr O2 at 1090 °C (reaction period 10E-2 s); collision yield; following reaction;; mass spectroscopy;; | 0.05% |
In neat (no solvent) examination of the CH4-O2 reaction;; |
Conditions | Yield |
---|---|
Kinetics; byproducts: OH, H2O, O2; at 298-386 K and 15-150 Torr; | |
In neat (no solvent) Kinetics; byproducts: OH, H2O, O2; gaseous H2O2 was mixed with O+O2; rate constant;; | |
In neat (no solvent) |
Conditions | Yield |
---|---|
In gaseous matrix Kinetics; reaction of OH (produced on reaction of H + NO2 -> OH + NO) and O3 (He carrier gas, 1.5 - 4 Torr, 300 K - 423 K); |
Conditions | Yield |
---|---|
With water; acetic acid In water Kinetics; byproducts: O2; Irradiation (UV/VIS); | |
In neat (no solvent) Kinetics; byproducts: O2; OH radicals formed from H+NO2 reacted with O3; rate constant;; UV absorption measurements;; |
Conditions | Yield |
---|---|
With nitrogen In gas Kinetics; kinetic of react. of OH radical with H2O2 studied over temp. range 96-296 K; H2O2/N2 gas expanded through Laval nozzle; laser-induced fluorescence of OH radical used as probe; | |
In gas Kinetics; kinetics studied at 250-1250 K by means of UV spectroscopy; | |
In gaseous matrix Kinetics; 245-423 K; total pressure=45-500 torr; in He stream, in contact with quarz, Pyrex or Teflon only; not sepd.; |
Conditions | Yield |
---|---|
In gas fast-flow discharge system (according to: T. E. Kleindienst, B. J. Finlayson-Pitts, J. Chem. Phys. Lett. 61 (1979) 300), halocarbon wax or boric acid coated flow tube, H or O3 excess; resonance fluorescence technique, titration of H; |
Conditions | Yield |
---|---|
In gaseous matrix Kinetics; other Radiation; laser photolysis (mixt. of O3 with He (1:1E+4), KrF excimer laser); detection by time-resolved atomic absorption spectroscopy; | |
fast-flow discharge system (room temp., excess of O3, bychoise addn. ofCO or NO); |
dihydrogen peroxide
ozone
A
hydroxyl
B
oxygen
C
hydroperoxyl radical
Conditions | Yield |
---|---|
In water Kinetics; |
water
A
hydroxyl
B
hydrogen
C
dihydrogen peroxide
D
hydroperoxyl radical
Conditions | Yield |
---|---|
Kinetics; other Radiation; effect of radiation type and scavanger concn. in water radiolysis; |
hydrogen sulfide
water
oxygen
A
sulfur dioxide hydrate
B
SO3 * water
C
sulfuric acid
D
sulfur dioxide
E
hydroperoxyl radical
Conditions | Yield |
---|---|
In solid matrix Irradiation (UV/VIS); further products; 270-420 nm photolysis in O2-matrix at 13 K (4-14 h); product ratio depending on matrix composition; not isolated, detected by IR; |
water
oxygen
A
hydrogen peroxide water
B
dihydrogen peroxide
C
ozone
D
hydroperoxyl radical
Conditions | Yield |
---|---|
In solid matrix Irradiation (UV/VIS); photolysis at 13 K for 1.8 h (λ > 220 nm); not isolated, detected by IR; |
hydrogen cyanide
A
isocyanic acid
C
carbon nitride
D
hydroperoxyl radical
Conditions | Yield |
---|---|
Ar/HCN is codeposited with O atoms (produced by microwave discharge of Ar/O2)on cold CsI window; IR matrix isolation study; |
silver (I) ion
hydroperoxide anion
A
silver
B
hydroperoxyl radical
Conditions | Yield |
---|---|
In water mechanism of H2O2-decomposition discussed;; | |
In water mechanism of H2O2-decomposition discussed;; |
dihydrogen peroxide
carbonate radical anion
A
hydrogen carbonate
B
hydroperoxyl radical
Conditions | Yield |
---|---|
In water pH=6.3, 24°C; |
Conditions | Yield |
---|---|
In gaseous matrix byproducts: HCl; He carrier gas; |
Conditions | Yield |
---|---|
With oxygen In gas Kinetics; Flash photolysis-shock tube react.of O2/Ar-mixt. with H (produced by photodissociation of NH3 or H2O).; Rate consts. between 746 and 1705 K at various pressures given.; |
Conditions | Yield |
---|---|
In gas Kinetics; under Ar, mixed, reacted at 293 K (P=1 kPa); ESR, gas chromy.; |
Conditions | Yield |
---|---|
In gas Kinetics; rate coefficients measured via OH absorption behind reflected shock waves at 950-3100 K; H2/O2/Ar mixtures prepared manometrically and allowed to stand for at least 48 h; |
Conditions | Yield |
---|---|
In gaseous matrix Kinetics; H and O2 reacted in excess of Ar in fast flow-discharge tube at 2-10 Torr and at 231-512 K; detected by mass spectrometry and GC chromy; | |
With He or N2 or H2O In gas Kinetics; other Radiation; reacting H atoms with O2 in the presence of He, N2 or H2O (microwave discharge, pressure 0.25 - 1 Torr); | |
With nitrogen In gas Kinetics; |
Conditions | Yield |
---|---|
Kinetics; in O2/H2 flame; fluorescence spectroscopy; |
Conditions | Yield |
---|---|
With isopropyl alcohol; 12-tungstoferric acid In water Kinetics; Irradiation (UV/VIS); soln. contg. heteropolytungstate ion (2E-6 M) and i-PrOH (1.7 M) subjected to 10E-6 s photoflash in presence of O2 (2E-4 M) at pH 1.0 (0.05 M H2SO4); | |
With isopropyl alcohol; sodium phosphotungstate In water Kinetics; Irradiation (UV/VIS); soln. contg. heteropolytungstate ion (2E-6 M) and i-PrOH (1.7 M) subjected to 10E-6 s photoflash in presence of O2 (2E-4 M) at pH 1.0 (0.05 M H2SO4); | |
With isopropyl alcohol; sodium metatungstate In water Kinetics; Irradiation (UV/VIS); soln. contg. polytungstate ion (2E-6 M) and i-PrOH (1.7 M) subjected to10E-6 s photoflash in presence of O2 (2E-4 M) at pH 1.0 (0.05 M H2SO4); | |
With isopropyl alcohol; 12-tungstosilicic acid, K-salt In water Kinetics; Irradiation (UV/VIS); soln. contg. heteropolytungstate ion (2E-6 M) and i-PrOH (1.7 M) subjected to 10E-6 s photoflash in presence of O2 (2E-4 M) at pH 1.0 (0.05 M H2SO4); |
formyl radical
oxygen
A
carbon monoxide
B
hydroperoxyl radical
hydrogen sulfide
oxygen
A
sulfuric acid
B
sulfur dioxide
C
sulfur trioxide
D
ozone
E
hydroperoxyl radical
Conditions | Yield |
---|---|
byproducts: H2O*SO2, H2O*SO3; Irradiation (UV/VIS); in solid O2, 15K; H2O*SO2 and H2O*SO3 present in significant amounts; detected by IR; |
hydrogen sulfide
oxygen
A
sulfur dioxide hydrate
B
SO3 * water
C
sulfuric acid
D
sulfur dioxide
E
hydroperoxyl radical
Conditions | Yield |
---|---|
In solid matrix Irradiation (UV/VIS); further products; 270-420 nm photolysis in O2-matrix at 13 K (4-14 h); product ratio depending on matrix:solute ratio (200-8000); not isolated, detected by IR; |
Conditions | Yield |
---|---|
In gaseous matrix Kinetics; Cl concn. 3E11 - 3E12 molecule/cm3, HO2 concn. 1E10 - 5E11 molecule/cm3,236 K, 1 Torr of He; | A 94.5% B n/a |
In gaseous matrix Kinetics; Cl concn. 3E11 - 3E12 molecule/cm3, HO2 concn. 1E10 - 5E11 molecule/cm3,256 K, 1 Torr of He; | A 79.4% B n/a |
In gaseous matrix Kinetics; Cl concn. 3E11 - 3E12 molecule/cm3, HO2 concn. 1E10 - 5E11 molecule/cm3,276 K, 1 Torr of He; | A 74.8% B n/a |
In gaseous matrix Kinetics; Cl concn. 3E11 - 3E12 molecule/cm3, HO2 concn. 1E10 - 5E11 molecule/cm3,296 K, 1 Torr of He; | A 70.4% B n/a |
Conditions | Yield |
---|---|
In gaseous matrix Kinetics; Cl concn. 2E10 - 5E10 molecule/cm3, HO2 concn. 4E11 - 4E12 molecule/cm3,336 K, 1 Torr of He; | A 26% B n/a |
In gaseous matrix Kinetics; Cl concn. 2E10 - 5E10 molecule/cm3, HO2 concn. 4E11 - 4E12 molecule/cm3,316 K, 1 Torr of He; | A 23.6% B n/a |
In gaseous matrix Kinetics; Cl concn. 2E10 - 5E10 molecule/cm3, HO2 concn. 4E11 - 4E12 molecule/cm3,296 K, 1 Torr of He; | A 18.6% B n/a |
Conditions | Yield |
---|---|
Kinetics; byproducts: O2; rate constant;; | |
In sulfuric acid Kinetics; byproducts: O2; other Radiation; decrease of HO2 which was formed by pulsed or continuous electron radiation of H2O2-O2-H2SO4 soln.; rate constant;; | |
In gaseous matrix Kinetics; byproducts: O2; 298 K, He or Ar present at total pressures 75 - 730 torr; |
Conditions | Yield |
---|---|
In gaseous matrix Kinetics; reaction of O2H (produced on reaction of H + O2 + M -> HO2 + M) and O3 (He carrier gas, 1.5 - 4 Torr, 245 K - 365 K); | |
In gas Kinetics; discharge-flow system at room temp.;; | |
In gas Kinetics; rate constant determined in the temp. range 233-400 K; |
Conditions | Yield |
---|---|
byproducts: OH; |
Conditions | Yield |
---|---|
In water |
Conditions | Yield |
---|---|
Kinetics; in O2/H2 flame; fluorescence spectroscopy; |
Conditions | Yield |
---|---|
Kinetics; in O2/H2 flame; fluorescence spectroscopy; |
Conditions | Yield |
---|---|
Kinetics; in O2/H2 flame; fluorescence spectroscopy; |
Conditions | Yield |
---|---|
In gaseous matrix Kinetics; byproducts: O2; react. of atomic oxygen and HO2 radicals at 2 Torr, 299 K in a He flow; not isolated, detected by resonance fluorescence technique; | |
In gaseous matrix Kinetics; byproducts: O2; educts were produced by laser pulsed photolysis of O3 and H2O2 in N2 or Ar at 10-500 Torr; detection by time-resolved fluorescence; | |
In neat (no solvent) Kinetics; byproducts: O2; rate constant;; |
IUPAC Name: Molecular oxygen
Canonical SMILES: O=O
InChI: InChI=1S/O2/c1-2
Molecular Formula: O2
Molecular Weight: 32.00
EINECS: 231-956-9
Classification Code: Gas, medicinal; Human Data; Mutation data; Reproductive Effect
Melting Point: -218 °C(lit.)
Stability: Stable. Vigorously supports combustion. Incompatible with phosphorus, organic materials, many powdered metals.
Index of Refraction: 1.122
Molar Refractivity: 2.36 cm3
Molar Volume: 29.5 cm3
Surface Tension: 20.2 dyne/cm
Density: 1.082 g/cm3
Enthalpy of Vaporization: 6.8 kJ/mol
Vapour Pressure of Oxygen (CAS NO.7782-44-7): 322000 mmHg at 25 °C
Oxygen (CAS NO.7782-44-7) was first discovered by Swedish pharmacist Carl Wilhelm Scheele. He had produced oxygen gas by heating mercuric oxide and various nitrates by about 1772. In 1891 Scottish chemist James Dewar was able to produce enough liquid oxygen to study. in 1895 by German engineer Carl von Linde and British engineer William Hampson. Later, in 1901, oxyacetylene welding was demonstrated for the first time by burning a mixture of acetylene and compressed O2. In 1923 the American scientist Robert H. Goddard became the first person to develop a rocket engine; the engine used gasoline for fuel and liquid oxygen as the oxidizer. Goddard successfully flew a small liquid-fueled rocket 56 m at 97 km/h on March 16, 1926 in Auburn, Massachusetts, USA.
Oxygen (CAS NO.7782-44-7) is used for primary metals manufacturing, chemicals manufacturing, oxidation processes, and partial oxidation processes. The steel industry prefers to use pure oxygen rather than air in processing iron. The oxygen reacts with elemental carbon to form carbon monoxide, which is processed with iron oxide so that carbon is incorporated into the iron metal, making it much lower melting and more pliable (fusible pig iron).
Oxygen is also used medically for patients who require mechanical ventilation, often at concentrations above 21% found in ambient air.
In other oxygen applications, metal fabrication involves cutting and welding with an oxygen-acetylene torch. Chemical manufacture use includes the formation of ethylene oxide, acrylic acid, propylene oxide, and vinyl acetate. Miscellaneous uses include sewage treatment, aeration, pulp and paper bleaching, and missile fuel.
Oxygen (CAS NO.7782-44-7) is produced industrially by fractional distillation of liquefied air, use of zeolites to remove carbon dioxide and nitrogen from air, electrolysis of water and other means.
The manufacture of oxygen is described along with that of nitrogen (Fig. l) during the liquefaction of air. Pressure swing adsorption (Fig. 2) is also used to generate pure oxygen.
FIGURE 1 Manufacture of oxygen by the liquefaction of air.
FIGURE 2 Pressure swing adsorption for oxygen generation and purification.
1. | cyt-ham:lng 80 pph | MUREAV Mutation Research. 57 (1978),27. | ||
2. | cyt-ham:lng 80 pph | ACATA5 Acta Anatomica. 94 (1976),520. | ||
3. | ihl-hmn TCLo:100 pph/14H:PUL | JAMAAP JAMA, Journal of the American Medical Association. 128 (1945),710. |
Reported in EPA TSCA Inventory. EPA Genetic Toxicology Program.
Human systemic effects by inhalation: cough and other pulmonary changes. Human teratogenic effects by inhalation: developmental abnormalities of the fetal cardiovascular system. Mutation data reported. Not toxic as gas. In liquid form it can cause severe “burns” and tissue damage on contact with the skin due to extreme cold.
Hazard Codes: O,C
Risk Statements: 8-52/53-34
R8 :Contact with combustible material may cause fire.
R52/53:Harmful to aquatic organisms, may cause long-term adverse effects in the aquatic environment.
R34:Causes burns.
Safety Statements: 17-45-36/37/39-26-61
S17:Keep away from combustible material.
S45:In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.)
S36/37/39:Wear suitable protective clothing, gloves and eye/face protection.
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice.
S61:Avoid release to the environment. Refer to special instructions / safety data sheets.
RIDADR: UN 1072 2.2
RTECS: RS2060000
F: 4.5-31
HazardClass: 2.2
DOT Classification: 2.2; Label: Nonflammable Gas, Oxidizer
For occupational chemical analysis use NIOSH: Oxygen (field-readable) 6601.
Oxygen (CAS NO.7782-44-7), its Synonyms are Hyperoxia ; LOX ; Liquid oxygen ; Molecular oxygen ; Oxigeno ; Oxigeno [Spanish] ; Oxygen ; Oxygen molecule ; Oxygen, liquified ; Oxygen-16 ; Oxygene ; Oxygene [French] ; Oxygenium ; Oxygenium medicinale ; Pure oxygen ; Sauerstoff .
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