Selective isopropylation of cumene to meta-diisopropylbenzene
AssigneePCUK Produits Chimiques Ugine Kuhlmann
InventorGeorge A. Olah
Life of this patent
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Abstract
Resorcinol is prepared in high yield and purity by an improved process through superacid (such as perfluorinated alkanesulfonic acids of one to eighteen carbon atoms or polymeric perfluorinated resinsulfonic acids, such as acidified Nafion-H, catalyzed cleavage rearrangement reaction of meta-bis(2-hydroperoxy-2-propyl)benzene (meta-diisopropylbenzene dihydroperoxide). Part of the process is the preparation of needed meta-diisopropylbenzene in high purity (98-100%) substantially free of other isomers by treating any mixture of diisopropylbenzenes with an excess of anhydrous hydrogen fluoride or a perfluorinated alkanesulfonic acid of one to eighteen carbon atoms and a Lewis acid fluoride, or by alkylating (transalkylating) cumene with a propyl alkylating agent in the aforementioned superacid systems.
Claims8
A process for preparing a substantially pure meta-diisopropyl benzene isomer which comprises alkylating cumene with a propyl alkylating agent in the presence of hydrogen fluoride and a Lewis acid fluoride catalyst at reaction temperatures between about -20.degree. and 0.degree. C. to produce said meta-diisopropyl benzene isomer.
A process for preparing a substantially pure meta-diisopropyl benzene isomer which comprises alkylating cumene with a propyl alkylating agent in the presence of a perfluorinated alkane sulfonic acid of 1 to 18 carbon atoms and a Lewis acid fluoride catalyst at a reaction temperature between about -20.degree. and 0.degree. C. to produce said meta-diisopropyl benzene isomer.
A process for preparing a substantially pure meta-diisopropyl benzene isomer which comprises adding a propyl alkylating agent and hydrogen fluoride to cumene in the presence of a boron trifluoride catalyst at temperatures between about -20.degree. and 0.degree. C. to produce said meta-diisopropyl benzene isomer.
Dependencies are inferred from the claim text.