Glycerol to renewable fuel oxygenates. Part I: Comparison between solketal and its methyl ether

• Published in: Fuel (Guildford) Vol. 249; pp. 486 - 495
• Main Authors: Samoilov, V.O., Maximov, A.L., Stolonogova, T.I., Chernysheva, E.A., Kapustin, V.M., Karpunina, A.O.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01-08-2019; Elsevier BV
• Subjects: Acetone; Additives; Alkylation; Ethanol; Gasoline; Glycerol; Glycerol ethers; Ketalization; Methyl tert-butyl ether; MTBE; Oxidation; Renewable fuel additive; Solketal; Vapor pressure; Volatility; Glycerol; Solketal; Methyl tert-butyl ether; Ketalization; Glycerol ethers; Renewable fuel additive
• ISSN: 0016-2361; 1873-7153
• DOI: 10.1016/j.fuel.2019.02.098

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•Solketal methyl ether (SME) has been prepared from glycerol via two-step procedure.•Ketalization of glycerol and its monomethyl ether ran analogously.•Measured bRON values for SME (52–62) were twice lower than for solketal (100–110).•Free –OH group of solketal is proposed to be the “bearer” of anti-knock properties.•Antiknock properties for solketal – MTBE (MTAE, ethanol) mixtures were estimated.
Solketal methyl ether (SME) was synthesized from glycerol by conversion with methanol followed by ketalization with acetone. The values for the equilibrium constant of the ketalization of glycerol and glycerol 1-monomethyl ether in the temperature range of 298–323 K were determined experimentally, and its thermodynamic parameters (ΔH0, ΔS0, ΔG0) have been calculated, which appear to be very close for these two reactions. The gasoline blending properties of SME have been studied in comparison with solketal by examining the effects of solketal and SME additives on the fractional composition, saturated vapor pressure, oxidation induction period, existent gum content, density, and antiknock value of gasoline components and a model fuel blend. It has been shown that SME has better volatility, but a much lower antiknock value than solketal. The influence of the solketal additive on the antiknock value of components of compounded gasoline (alkylate, reformate, FCC gasoline) and the performance of composite additives based on solketal with ethanol, MTBE, and TAME are described.