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Ethylbenzene oxidation to its hydroperoxide in the presence of N-hydroxyimides and minute amounts of sodium hydroxide

Paper ID Volume ID Publish Year Pages File Format Full-Text
42304 45920 2009 8 PDF Available
Title
Ethylbenzene oxidation to its hydroperoxide in the presence of N-hydroxyimides and minute amounts of sodium hydroxide
Abstract

N-hydroxyimides of the type N-hydroxyphthalimide (NHPI), N-hydroxysuccinimide (NHSI), N-hydroxymaleinimide (NHMI) and N-hydroxynaphthalimide (NHNI) were used in ethylbenzene oxidation with air under soft reaction conditions. The ethylbenzene conversion profile was found to increase almost linearly with time, and the rate of ethylbenzene conversion was the highest in the presence of NHNI. Nevertheless, the selectivity reached in all cases is still far from the values required for industrial application. On the other hand, the hydroperoxide yield increased dramatically with the addition of minute amounts of sodium hydroxide to the reaction mixture. It is worth noting that this increase can be associated to an enhancement in the selectivity to hydroperoxide because, in fact, ethylbenzene conversion slightly decreased with the addition of sodium. Indeed, this behavior is puzzling, because the amount of sodium is very small regarding ethylbenzene (0.005 mol%) and yet its effect is enormous. Finally, a tenfold increase in the concentration of N-hydroxyimide yielded only a slight increase in ethylbenzene conversion, but no improvement in hydroperoxide concentration. This behavior is related to the participation of NO radicals in the formation of by-products (alcohols and ketones) from hydroperoxide. Up to date, the combination of NHPI and NaOH produces the highest hydroperoxide yield reported.

Graphical abstractN-hydroxyimides were used in ethylbenzene oxidation with air under soft reaction conditions. The ethylbenzene conversion increase in the presence of the organocatalysts. On the other hand, the hydroperoxide yield increased dramatically with the addition of a minute quantity of sodium hydroxide to the reaction mixture. Combination of NHPI and NaOH produce the highest yield to hydroperoxide reported.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Autoxidation; Organocatalysis; Homogeneous catalysis; Sodium hydroxide; Hydrocarbons; NHPI
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Ethylbenzene oxidation to its hydroperoxide in the presence of N-hydroxyimides and minute amounts of sodium hydroxide
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 363, Issues 1–2, 1 July 2009, Pages 32–39
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
You save - $31
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100% Money Back Guarantee
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