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Selective acetalization of ethylene glycol with methyl 2-napthyl ketone over solid acids: Efficacy of acidic clay supported Cs2.5H0.5PW12O40

Paper ID Volume ID Publish Year Pages File Format Full-Text
53984 46991 2014 11 PDF Available
Title
Selective acetalization of ethylene glycol with methyl 2-napthyl ketone over solid acids: Efficacy of acidic clay supported Cs2.5H0.5PW12O40
Abstract

•Acetalization of ethylene glycol with methyl 2-napthyl ketone with several acid catalysts.•20% (w/w) Cs-DTP/K-10 was the best catalyst.•87% conversion of methyl 2-napthyl ketone with 100% selectivity toward 2-methyl-2-napthyl-1,3-dioxolane.•Catalyst characterization by XRD, BET, FTIR, TPD and SEM techniques.•Reaction mechanism and kinetic model.

Catalytic conversion of biomass to value added products is relevant with regard to several industries. Biomass derived ethylene glycol has many applications. Acetalization is used to synthesize valuable chemicals and also occasionally to protect carbonyl groups of aromatic molecules in organic transformations. Acetalization of ethylene glycol to cyclic dioxolane has many applications in fragrance, cosmetics, food and beverage additives, pharmaceuticals, detergents, and lacquer industries. The current work reports synthesis of 2-methyl-2-napthyl-1,3-dioxolane by acetalization of ethylene glycol with methyl 2-napthyl ketone using several heterogeneous solid acid catalysts including 20% (w/w) Cs2.5H0.5PW12O40/K-10 (Cs-DTP/K-10), UDCaT-4, UDCaT-5 and K-10 clay. Among them, 20% (w/w) Cs-DTP/K-10 catalyst was found to be the most efficient catalyst giving 87% conversion of methyl 2-napthyl ketone with 100% selectivity toward 2-methyl-2-napthyl-1,3-dioxolane. Effects of several reaction parameters were studied and optimized. The optimum reaction conditions were: 110 °C, molar ratio of methyl 2-naphthyl ketone to ethylene glycol 1:2, catalyst loading 0.02 g/cm3, speed of agitation 800 rpm, and time 3 h. Reaction mechanism and kinetic model were developed. The methodology was extended to different substrates, and catalyst reusability was also studied. The catalyst was well characterized by various techniques such as XRD, BET, FTIR, TPD and SEM. It is robust and recyclable.

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Keywords
Heteropolyacids; Clay; Acetalization; Ethylene glycol; Methyl 2-napthyl ketone
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Selective acetalization of ethylene glycol with methyl 2-napthyl ketone over solid acids: Efficacy of acidic clay supported Cs2.5H0.5PW12O40
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 237, 15 November 2014, Pages 125–135
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us