Dehydrogenation of Terpenes to Cymene

Example 5

Dehydrogenation of terpenes to cymene was evaluated in the fixed bed reactor system depicted in FIG. 2. A mixture of terpenes, primarily rich in Limonene and phellandrene was fed into the reactor at 0.5 mL/min, in the presence of nitrogen at 10 ml/min with a temperature of 300° C. in the reactor. The reactor was packed with 12 g of 5% Palladium on Alumina catalyst. The resulting product show >96% of para cymene.

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US11873277B2. Circular economic methods for fragrance ingredients (2024-01-16). International Flavors & Fragrances Inc. [US]. Inventors: Sunitha R. Tadepalli [US], Paul Daniel Jones [US], Geatesh K. Tampy [US], John P. Cherkauskas [US].

Patent 2024

Alumina Cymene Limonene Nitrogen Palladium Terpenes

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Variable analysis

independent variables

Mixture of terpenes, primarily rich in Limonene and phellandrene
Feed rate of mixture (0.5 mL/min)
Nitrogen flow rate (10 mL/min)
Temperature (300°C)

dependent variables

Yield of para cymene (>96%)

control variables

Catalyst (12 g of 5% Palladium on Alumina catalyst)
Reactor type (fixed bed reactor system)

Annotations

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