Abstract:
High selectivities (>90%) for the production of secondary-alkyl substituted benzene hydroperoxides are achieved by heating a secondary-alkyl substituted benzene in the presence of oxygen and a samarium salt. Preferably, a free radical initiator is also present.
Abstract:
Disclosed is a method of treating hydroperoxide mixtures, which comprises bringing an oily hydroperoxide mixture containing (A) an aromatic hydroperoxide having a hydroperoxymethyl group directly bonded to the aromatic nucleus and (B) an aromatic hydroperoxide having a 2-hydroperoxy-2-propyl group bonded directly to the aromatic nucleus into contact with an aqueous alkali solution, separating the aqueous phase from the oil phase and decomposing at least a part of the component (A) extracted in the aqueous phase.According to this method, the starting oily hydroperoxide mixture can be converted to a mixture in which the primary hydroperoxide content is reduced without substantial loss of the tertiary hydroperoxide. Therefore, aromatic hydroperoxide mixtures suitable for production of phenols can advantageously be proceeded.
Abstract:
Episodes of accelerated decomposition, or runaway, during the preparation of hydrocarbon hydroperoxides by reaction of hydrocarbons with molecular oxygen at elevated temperature, are brought under control through the addition to the oxidation reaction mixture of a small quantity of base in a substantially instantaneous manner at the onset of the runaway.
Abstract:
4,4'-dihydroxydiphenyl ether (DHDPE) is prepared by the catalytic oxidation of 4,4'-diisopropyldiphenyl ether to the corresponding dihydroperoxide, the latter being subjected to acid cleavage to provide the desired dihydroxy compound.
Abstract:
Hydroperoxides, such as cyclohexylbenzene hydroperoxide, are manufactured by the oxidation of aryl compounds, such as cyclohexylbenzene, in the presence of a catalyst selected from the group consisting of C.sub.6 -C.sub.18 primary amines and polyvinylpyrrolidone.
Abstract:
The hydroperoxides of diisopropylbenzene are prepared by the oxidation of diisopropylbenzene with molecular oxygen in the presence of a minute amount of solid barium oxide.
Abstract:
Benzene or alkylbenzene (e.g. toluene) is alkylated with propylene to produce diisopropylbenzenes or isopropylalkylbenzenes, which in turn are selectively cracked to remove the 1,4-isomer. The resultant product, containing a high level of the 1,3-isomer, is then oxidized to 1,3-dihydroxybenzene or 3-alkylphenol (e.g. 3-methylphenyl) in significant yield.
Abstract:
A portion of a stream obtained by the oxidation of an aryl tertiary alkane and containing primarily aralkyl tertiary monohydroperoxide, substantial amounts of aryl tertiary alkane, smaller amounts of keto aryl tertiary alkanols, aralkyl tertiary dialkanols and other by-products is subjected to a separation step wherein a fraction containing the greater part of the aryl tertiary alkane and at least some of the monohydroperoxide, and a fraction containing the keto aryl tertiary alkanol are separated from one another and the fraction containing the aryl tertiary alkane and the monohydroperoxide is returned to the oxidation reaction.
Abstract:
A portion of a recycle stream obtained as a result of the oxidation of an aryl tertiary alkane and containing aralkyl tertiary monohydroperoxide, substantial amounts of unreacted aryl tertiary alkane and lesser amounts of poly-oxy-functional oxidation by-products is subjected to aqueous alkaline extraction to remove at least a portion of the poly-oxy-functional oxidation by-products therefrom followed by separation of the extraction mixture into an aqueous alkaline phase and an organic phase, the organic phase being recycled to the oxidation reaction.
Abstract:
Organometallic complexes formed between hexaalkylphosphoramides (HAPA) and metal salts, including rare earth metals, have been found to be effective catalyst for the oxidation of secondary and tertiary alkylaromatics to form valuable oxidation products, particularly the corresponding hydroperoxides. Novel complexes formed between HAPA and metal salts of the lanthanide series have been found to be especially effective in the selective formation of the hydroperoxides at high conversion rates. By substantially increasing the agitation and/or aeration of the reaction medium it is possible to increase these high conversion rates still further.