Reaction equilibria in the synthesis of 2-methoxy-2-methylbutane and 2-ethoxy-2-methylbutane in the liquid phase

Journal Article · Sat Oct 01 00:00:00 EDT 1994 · Journal of Chemical and Engineering Data; (United States)

DOI:https://doi.org/10.1021/je00016a013· OSTI ID:6940422

Rihko, L K; Linnekoski, J A; Krause, A O.I. ^[1]

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1. Helsinki Univ. of Technology, Espoo (Finland). Dept. of Chemical Engineering

Tertiary ethers are used as octane-enhancing components in gasoline. Equilibrium constants for the liquid-phase synthesis of 2-methoxy-2-methylbutane (TAME) and 2-ethoxy-20methylbutane (TAEE) were measured in the temperature range 323-363 K. The equilibria were studied using the alcohol/alkene mixture in various mole ratios and the respective ether as a reagent in a batch reactor. A commercial cation exchange resin (Amberlyst 16) was used as the catalyst. The system was strongly nonideal, and the UNIQUAC estimation method was used in the calculation of the liquid-phase activity coefficients. The experimental equilibrium constants are given as a function of temperature. At 333 K the equilibrium constants K[sub a] for the synthesis of TAME were 39.6 [+-] 2.5 from methanol and 2-methyl-1-butene (2M1B) and 4.1 [+-] 0.3 from 2-methyl-2-butene (2M2B). The equilibrium constants for the synthesis of TAEE were 17.4 [+-] 1.1 from ethanol and 2M1B and 1.7 [+-] 0.1 from 2M2B. The experimental [Delta][sub r]H values for the liquid-phase synthesis of TAME were [minus]33.6[+-]5.1 kJ/mol (2M1B) and [minus]26.8 [+-] 2.3 kJ/mol (2M2B), and those for the synthesis of TAEE were [minus]35.2 [+-] 5.8 kJ/mol (2M1B) and [minus]27.3 [+-] 6.7 kJ/mol (2M2B). The results were compared with the literature values.

• OSTI ID: 6940422
• Journal Information: Journal of Chemical and Engineering Data; (United States), Journal Name: Journal of Chemical and Engineering Data; (United States) Vol. 39:4; ISSN JCEAAX; ISSN 0021-9568
• Country of Publication: United States
• Language: English

Related Subjects

10 SYNTHETIC FUELS
100200* -- Synthetic Fuels-- Production-- (1990-)
ACTIVATION ENERGY
ADDITIVES
ALCOHOLS
ALKENES
BUTENES
CHEMICAL REACTION KINETICS
ENERGY
ETHANOL
ETHERS
FUEL ADDITIVES
HYDROCARBONS
HYDROXY COMPOUNDS
KINETICS
METHANOL
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
REACTION KINETICS
SYNTHESIS
THERMODYNAMIC PROPERTIES