Oxidative ethylbenzene

If quenching is a diffusion-controlled process (k 3xl09L mol 1 s ), the lifetime t 3x 10-7 s coincides with the lifetime of triplet acetophenone (product of peroxyl radical disproportionation in oxidized ethylbenzene). 

In the presence of an activator, naturally, the spectrum, yield, and lifetime are characteristics of the activator molecule. Indeed, the luminescence spectrum of the oxidized ethylbenzene was found to be identical to that of activator fluorescence [221]. 9,10-Dibromanthracene, 9,7-dipropylanthracene, and derivatives of oxazole were used as activators [221,223]. 

The measurement of the chain generation rate vi0 in oxidized ethylbenzene with bis(acetyla-cetonate) nickel showed that vi0 is sufficiently higher in the presence of the catalyst than in the noncatalyzed reaction (T = 393 K, [171]). 

The synergistic action of a phenol and aromatic amine mixture on hydrocarbon oxidation was found by Karpukhina et al. [16]. A synergistic effect of binary mixtures of some phenols and aromatic amines in oxidizing hydrocarbon is related to the interaction of inhibitors and their radicals [16-26]. In the case of a combined addition of phenyl-A-2-naphthylamine and 2,6-bis(l,l-dimethylethyl)phenol to oxidizing ethylbenzene (v, = const, 343 K), the consumption of amine begins only after the phenol has been exhausted [16], in spite of the fact that peroxyl radicals interact with amine more rapidly than with phenol (7c7 (amine) = 1.3 x 105 and /c7 (phenol) = 1.3 x 104 L mol 1 s respectively 333 K). This phenomenon can be explained in terms of the fast equilibrium reaction [27-30] ... 

Uses Preparation of polystyrene, styrene oxide, ethylbenzene, ethylcyclohexane, benzoic acid, synthetic rubber, resins, protective coatings, and insulators. 

EB/SM (ethylbenzene/styrene monomer) process. Styrene can also be made by PO/SM (propylene oxide/styrene monomer) process). This process starts by oxidizing ethylbenzene (C6H5CH2CH2) to its hydroperoxide (C6H5CH(OOH)CH3), which is then used to oxidize propylene (CH3CH = CH2) to produce propylene oxide (CH3CH2CHO) and phenylethanol (C6H5CH(OH)CH3). The phenylethanol is then dehydrated to give... 

Even (hough there are few direct end-uses foe ethylene, it is probably the most important petrochemical feedstock, both in terms of quantities used and economic value. Ethylene is the feedstock for ethylene oxide, ethylbenzene, ethyl chloride, elhylene dichloride, ethyl alcohol, and polyethylene, most of which, in turn, are used to produce hundreds of other end-products. Most elhylene is produced by sleam cracking of ethane or propane. 

Oxidative ethylbenzene dehydrogenation by oxygen in an amount equivalent to its concentration in 15% aqueous hydrogen peroxide at complete dissociation of the latter. 

Figure 25 Non-oxidative ethylbenzene dehydrogenation and side reactions.

Keywords oxidation, ethylbenzene, a-phenylethylhydroperoxide, homogeneous catalysis, dioxygen, iron (III) tris(acetylacetonate), quaternary ammonium salts, trace amount of H20. 

Oxidation. Ethylbenzene is oxidized to hydroperoxide by air injection in the liquid phase. This takes place simultaneously in several series of reactors in parallel, each containing three elements. These are empty vessels, generally of titanium, in which a residence time of abont one hour is maintained. In each series, these units operate at. decreasing temperature as the reaction advances. The heat liberated by the reaction is... 

See 1 Ethyl Alcohol Ethylene Glycol Ethylene Oxide Ethylbenzene Polyethylene Polypropylene Polystyrene Polyvinyl Chloride... 

Oxidation of hydrocarbon Cyclohexane and methyl cyclohexane were oxidized in the presence of FS-l(Fe) and FS-l(Cu).i) In this case zinc and acetic acid were indispensable for this oxidation. Ethylbenzene was oxidized with cobalt immobilized catalyst[I] and [II]. This oxidation started after the addition of a little content of hvdogen peroxide. 

Benzaldehyde Benzoic acid Cumene oxidation Ethylbenzene Heteroligand Monodentate ligands Uncatalyzed oxidation... 

The second process involves the coproduction of propylene oxide. Ethylbenzene is oxidized to its hydroperoxide, which is reacted with propylene to give the coproduct propylene-oxide and methyl phenyl carbinol, which is then dehydrated to styrene. 

The POM-Mn -porphyrin based hybrid material [Cd(MnTPyP)](PWj204o), consisting of catalytically active Mn -TPyP species and interlayered POMs, can efficiently oxidize alkylbenzene with tertbutylhydroperoxide (TBHP) oxidant. [Cd(MnTPyP)](PW,204o) oxidized ethylbenzene to form one product of acetophenone (92.7% yield), which is superior to those of its precursors, such as Mn Cl-TPyP (73.6% yield of acetophenone) and [PWi204o] (not active). [Cd(MnTPyP)](PWi204o) also presents excellent size selectivity in the oxidation of a series of alkylbenzene. 

Synergism is observed when binary mixtures of some phenols and aromatic amines are introduced into hydrocarbon. It is related to the interaction of inhibitors and radicals formed from them. For the combined introduction of phenyl-N-P-naph-thylamine and 2,6-di-fert-butylphenol into oxidized ethylbenzene (v, = const, 343 K), phenol is consumed first, and amine begins to consume only after its disappearance, although RO 2 reacts with amine more rapidly (A31 = 1.3T0 l/(mol s), 333 K) than... 

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