Selective liquid-phase transformation of α-pinene over dealuminated mordenites and Y-zeolites

López, Carmen M.; Machado, Francisco J.; Rodriguez, Karina F.; Méndez, Bernardo; Hasegawa, Masahisa; Pékerar, Sara

doi:10.1016/s0926-860x(98)00148-3

Cited by 61 publications

(30 citation statements)

References 16 publications

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“…It is seen that selectivity to bi=tricyclic products was almost independent of conversion on all catalysts studied irrespectively of the acid treatment procedure. Similar results have been reported in the literature (Allahverdiev et al, 1998;Lopez et al, 1998). As seen in Figure 4, selectivity to limonene was very much dependent on conversion.…”

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confidence: 91%

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Isomerization of Alpha-pinene Over Acid Treated Natural Zeolite

Ünveren

Gündüz

Çakıcıoğlu-Özkan

2005

Chemical Engineering Communications

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In this study, isomerization of a-pinene was studied over several acid-treated natural zeolite catalysts rich in clinoptilolite. Zeolite samples were contacted with HCl at different concentrations at 30 C or at 60 C for 3 and 24 hours and tested in isomerization reaction of alpha-pinene. The catalysts prepared were characterized by XRD, nitrogen adsorption, and acidity studies. Acidity strength and the distribution of Lewis and Brö nsted acid sites of the catalysts were determined, and their catalytic activities in a-pinene isomerization and selectivities to main reaction products, camphene and limonene, were investigated. Acid treatment improved the selectivity of catalyst samples to camphene, decreasing the selectivity to limonene, probably forcing limonene to secondary reactions at high conversions.The kinetics of a-pinene consumption was described by first-order kinetics. Two kinetic models were tested for the reaction mechanism and one model was found to give a good correlation between the theoretical and experimental data. In the models, the key intermediate was the pinylcarbonium ion, which was formed irreversibly from a-pinene.Number and distribution of Lewis and Brö nsted acid sites affect the formation of bicyclic and monocyclic products.

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confidence: 91%

“…It is well known that not only acidity but also textural properties affect product distribution in a-pinene isomerization (Stefanis et al, 1995;Lopez et al, 1998). However, it is rather difficult to separate these effects from each other because they are so striking.…”

Section: Discussionmentioning

confidence: 99%

Isomerization of Alpha-pinene Over Acid Treated Natural Zeolite

Ünveren

Gündüz

Çakıcıoğlu-Özkan

2005

Chemical Engineering Communications

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“…Various types of catalysts prepared from titanium dioxide [1][2][3][4][5][6], clays [7][8][9], halloysite [10,11], natural zeolites [12][13][14][15][16], activated carbon [17], synthetic zeolites [18][19][20][21][22][23][24][25][26][27][28][29] and silica supported rare earth oxides [21] have been reported in the literature for the isomerization of ␣-pinene. It is well known that the difference in acidity of the catalyst influences ␣-pinene isomerization especially with respect to limonene.…”

Section: Introductionmentioning

confidence: 99%

Isomerization of α-pinene over ion-exchanged natural zeolites

Özkan

Gündüz

Akpolat

et al. 2003

Chemical Engineering Journal

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“…A common method of α-terpineol synthesis consists of hydration of α-pinene with an aqueous mineral to give cis-terpin hydrate, followed by partial dehydration into α-terpineol (Surburg & Panten, 2006 (2) α-pinene α-terpineol Solid catalysts are, however, more desirable as they produce less waste and give high catalytic performance (Van der Wall, Van Bekum, & Vital, 1996;Lopez et al, 1998). Some small industrial plants already exist, but the concept for larger scale industrial application has not yet been found as it still needs optimization.…”

Section: Introductionmentioning

confidence: 99%

Continuous Production of a-Terpineol from a-Pinene Isolated from Indonesian Crude Turpentine

Budiman¹,

Arifta²,

Diana³

et al. 2015

MAS

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Pine trees in Indonesia are largely of the pine mercusii species which typically give turpentine that contains about 82% α-pinene, 12% carene and is balanced with numerous other components such as camphene, β-pinene and limonene. When treated with water in the presence of an acetic acid catalyst, α-pinene is hydrated to become a complex mixture of monoterpenes, alcohol and hydrocarbons, although α-terpineol predominates. This α-terpineol is a valuable compound which is widely used as a fragrant substance in the cosmetic industry as an anti fungal agent in the pharmaceutical industry, a disinfectant, an odorant in the cleaning industry and as a mineral flotation agent in the mining industry. A conventional configuration for this hydration process involves two steps, chemical reaction of α-pinene in a reactor followed by a separation step in a distillation column. In this experiment, we combined both chemical reactions and separation by distillation in a reactive distillation column to reduce the production and operating cost. Steady state condition, feed plate position, pressure and volumetric ratio of α-pinene and CAA solution were investigated to study the effect of using this method. A certain ratio of 87% weight of α-pinene and 5.3 M Choloroacetic Acid (CAA) solution as a catalyst were inputted to the reactive distillation column. The result shows that the highest purity of α-terpineol is 38.89 % weight.

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Selective liquid-phase transformation of α-pinene over dealuminated mordenites and Y-zeolites

Cited by 61 publications

References 16 publications

Isomerization of Alpha-pinene Over Acid Treated Natural Zeolite

Isomerization of Alpha-pinene Over Acid Treated Natural Zeolite

Isomerization of α-pinene over ion-exchanged natural zeolites

Continuous Production of a-Terpineol from a-Pinene Isolated from Indonesian Crude Turpentine

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