Ozonized oxygen

The calculated half-life of 1 mol % (1.5 wt %) of pure gaseous ozone diluted with oxygen at 25, 100, and 250°C (based on rate constants from Ref. 19) is 19.3 yr, 5.2 h, and 0.1 s, respectively. Although pure ozone—oxygen mixtures are stable at ordinary temperatures ia the absence of catalysts and light, ozone produced on an iadustrial scale by silent discharge is less stable due to the presence of impurities however, ozone produced from oxygen is more stable than that from air. At 20°C, 1 mol % ozone produced from air is - 30% decomposed ia 12 h. 

Bismuth pentafluoride is an active fluorinating agent. It reacts explosively with water to form ozone, oxygen difluoride, and a voluminous chocolate-brown precipitate, possibly a hydrated bismuth(V) oxyfluoride. A similar brown precipitate is observed when the white soHd compound bismuth oxytrifluoride [66172-91 -6] BiOF, is hydrolyzed. Upon standing, the chocolate-brown precipitate slowly undergoes reduction to yield a white bismuth(Ill) compound. At room temperature BiF reacts vigorously with iodine or sulfur above 50°C it converts paraffin oil to fluorocarbons at 150°C it fluorinates uranium tetrafluoride to uranium pentafluoride and at 180°C it converts Br2 to bromine trifluoride, BrF, and bromine pentafluoride, BrF, and chlorine to chlorine fluoride, GIF. It apparently does not react with dry oxygen. 

Pure ozone is made by fraetional distillation of the blue liquid resulting from the eooling of ozonized oxygen in liquid air. Commereially it is often supplied dissolved in ehlorofluoroearbons in stainless steel eyiinders at ea 475 psig eyiinder pressure at 20°C often transported ehilled with dry iee. These solutions ean be handled safely at vapour eoneentrations of ea 20% by volume of ozone. 

The acid (3 g) is refluxed with excess acetic anhydride for 45 min, and the excess anhydride evaporated in vacuo. The residue is dissolved in 100 ml. of chloroform and cooled in a bath of ice and hydrochloric acid. With stirring, a solution of 1.45 g of bromine (1 mole) in 50 ml of chloroform is added during 1 hr. Ozonized oxygen is passed through the cold solution until no more ozone is absorbed. The solvent is evaporated in vacuo below 30° and... 

Ozonsauerstoff, m. ozonized oxygen, oxygen in the form of ozone. 

Free radicals can also be formed on the cellulose molecule by using H2O2 [20-23], ozone-oxygen mixture [21,22], perminganate [22], and bromate [24]. 

We see that chiorine atoms provide an aitemative mechanism for the reaction of ozone with oxygen atoms. The iower-energy pathway breaks down ozone in the stratosphere at a significantiy faster rate than in the absence of the cataiyst. This disturbs the deiicate baiance among ozone, oxygen atoms, and oxygen molecules in a way that poses a serious threat to the iife-protecting ozone iayer. 

With isoprene, 2,3-dimethylbuta-1,3-diene and cyclopentadiene, if the ozone concentration in the ozone/oxygen mixture exceeds a certain limit (not stated), the medium immediately combusts when incorporating this mixture at -78°C. 

Finally, acetylene detonates violently when it comes into contact with an ozone/oxygen mixture in which the quantity of ozone exceeds 50 mg/l. 

Treatment of isoprene, 2,3-dimethylbutadiene or cyclopentadiene in pentane at —78°C with a high ratio ozone/oxygen stream led to immediate ignition and flames in both liquid and gas phases. 

Schubert, C.C., Pease, R.N. (1956) The oxidation of lower paraffin hydrocarbons. I. Room temperature reaction of methane, propane, n-butane and isobutane with ozonized oxygen. J. Am. Chem. Soc. 78, 2044—2048. 

VV Shereshovets. Mechanism of Oxidation of Cumene by Mixture of Ozone-Oxygen. Ph.D. thesis Dissertation, Institute of Chemical Physics, Chernogolovka, 1978, pp 1-21 [in Russian]. 

Hibernia A process for making formaldehyde by the partial oxidation of methane by ozonized oxygen. The catalyst is barium peroxide activated with silver oxide. Developed in Germany during World War II but not commercialized. 

Laboratory studies carried out by Priest and his co-workers - have demonstrated by means of infrared and other techniques that terminal double bonds in polyethylene end groups are attacked by "ozonized" oxygen to form carboxylic acid groups and by rupture of... 

The crude product may contain a small amount of sesquioxide, P2O3, which may he removed by sublimation in ozonized oxygen. 

Approximate values are obtained from the potentials of the deposition of Po and P0O2. Because of the emanation of high-energy a-particles, ozone, oxygen radicals, and peroxides are formed from water, which can oxidize Po + ions. 

The product of the one-electron reduction of O2, the superoxide ion, Oi, is highly unstable in acidic-aqueous solutions where its protonated form, the peroxyl radical H02(pA = 4.8), decomposes to ozone, oxygen, and hydrogen peroxide experiments have shown that the two latter compounds are produced almost quantitatively, when only traces of ozone are found. In alkaline solutions, the superoxide ion is more stable even if it decomposes spontaneously to O2 and H02 (AG-6-=—51.13 kj mol ), it has been studied by polarography in NaOH solutions, in the presence of compounds that adsorb at the surface of the electrode and slow down the protonation of 02 . From these electrochemical experiments... 

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