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Optimization of Conditions for the Synthesis of 4,4-Dimethyl-1,3-dioxane from tert-Butanol in the Presence of Carbon-Сontaining Porous Materials

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Abstract

The dioxane method for the isoprene production is a chemically two-stage process based on the splitting of 4,4-dimethyl-1,3-dioxane. The latter is synthesized by condensation of iso-C4H8 or tert-C4H9OH with CH2O (Prins reaction). One of the disadvantages of the considered method of isoprene synthesis is the formation of up to 30–40 wt % by-products (dihydropyrans, diols, unsaturated alcohols, etc.) at the stage of 4,4-dimethyl-1,3-dioxane synthesis. The insufficiently high selectivity of the 4,4-dimethyl-1,3-dioxane formation is due to the multichannel Prins reaction; therefore, a noticeable increase in the selectivity of the process cannot be achieved only by optimizing the currently implemented technological schemes of the dioxane method for the isoprene production. The parameters of the reaction of tert-С4H9OH with CH2O in the presence of carbon-containing porous materials were selected using the linear optimization method. It was found that the condensation of tert-C4H9OH with CH2O under catalysis conditions with both carbon nanotubes and porous glassy carbon can yield 4,4-dimethyl-1,3-dioxane with a selectivity of up to ~99 wt %.

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Authors and Affiliations

  1. Bashkir State University, 450076, Ufa, Russia

    V. S. Tukhvatshin, R. F. Talipov & G. R. Talipova

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  1. V. S. Tukhvatshin
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  2. R. F. Talipov
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  3. G. R. Talipova
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Contributions

R.F. Talipov: setting the objectives of the study and the plan of experimental work; V.S. Tukhvatshin: synthesis of 4,4-dimethyl-1,3-dioxane in the presence of carbon nanotubes; G.R. Talipova: synthesis of 4,4-dimethyl-1,3-dioxane in the presence of porous glassy carbon.

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Correspondence to V. S. Tukhvatshin.

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Additional information

Translated from Zhurnal Prikladnoi Khimii, No. 7, pp. 860–864, July, 2022 https://doi.org/10.31857/S0044461822070040

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Tukhvatshin, V.S., Talipov, R.F. & Talipova, G.R. Optimization of Conditions for the Synthesis of 4,4-Dimethyl-1,3-dioxane from tert-Butanol in the Presence of Carbon-Сontaining Porous Materials. Russ J Appl Chem 95, 943–947 (2022). https://doi.org/10.1134/S1070427222070047

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