Automated on-line gas chromatographic injection of samples completely liquified by pressure

Marsman, Jan Henk; Panneman, H.J.; Beenackers, A.A.C.M.

doi:10.1007/bf02268186

Cited by 8 publications

(9 citation statements)

References 7 publications

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“…The reactor was connected directly to the liquid sampling valve (VALGO 4-CL4WE) which Injects a small pressurized liquid volume (0.2 pL) to the gas chromatograph (HP 5890A). This technique has been shown to be suitable to analyze liquids and liquified gases with an excellent reproducibility (5).…”

Section: Methodsmentioning

confidence: 99%

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Equilibrium constants for methyl tert-butyl ether liquid-phase synthesis

Izquierdo¹,

Cunill²,

Vila³

et al. 1992

J. Chem. Eng. Data

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Equilibrium constants for the liquid-phase synthesis of methyl ferf-butyl ether (MTBE) were determined experimentally In the temperature range 40-80 °C. Equilibrium was established In the methanol addition to Isobutylene for obtaining MTBE over the sulfonic acid resin Lewatlt SPC 118 as the catalyst In a batch reactor maintained at 1.8 MPa. The experimental equilibrium constant Is given as a function of temperature, and enthalpy, free energy, and entropy changes have been determined as well. At 298 K, H°= -38.0 ± 0.8 kJ mol'1, AG°= -13.8 ± 0.8 kJ mol"1, and AS0 = -81.7 ± 0.5 J mol-1 K'1. The UNIFAC estimates of activity coefficients have been used to describe the liquid-phase nonideality. A comparison of experimental, thermodynamic, and literature data has been carried out.

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Section: Methodsmentioning

confidence: 99%

“…The standard entropy change for the liquid-phase reaction can be deduced from the vaporization heats through the expression 5°(|)(7) = AS°ia) -(\/ ) , \,( ) (5) where each AH0^i s obtained by the Watson relation (eq 6):…”

Section: Methodsmentioning

confidence: 99%

Equilibrium constants for methyl tert-butyl ether liquid-phase synthesis

Izquierdo¹,

Cunill²,

Vila³

et al. 1992

J. Chem. Eng. Data

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“…Therefore we developed a new on-line GLC analysis (Marsman et al, 1988), which is schematically shown in Figure 1. A liquid sample stream, kept under pressure and heated up to 423 K to avoid phase separation and vapor formation, was fed to a liquid injection valve of 0.2 /iL.…”

Section: Methodsmentioning

confidence: 99%

“…With four to five calibration mixtures, we calculated the correction factors Kfi0L and Kt¡ENE, which are the relation between amount and peak area of water relative to amount and peak area of cyclohexanol and cyclohexene, respectively. While our concentration range was always very narrow (both OL and ENE < 0.05 mol-L"1), it was permissible to use an average correction factor for both cyclohexene and cyclohexanol (Marsman et al, 1988). The initial concentration of water is known, and is almost constant.…”

Section: Computation Of Kx Values From Glc Datamentioning

confidence: 99%

Solvent effects on the hydration of cyclohexene catalyzed by a strong acid ion-exchange resin. 3. Effect of sulfolane on the equilibrium conversion

Panneman¹,

Beenackers²

1992

Ind. Eng. Chem. Res.

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“…Experimental Section Initial hydration rates of cyclohexene in different solvent mixtures were measured. The catalyst preparation technique, the equipment used for measuring the kinetics, the analytical methods, and the experimental procedures applied in the determination of initial rate constants were the same as those used for the determination of the equilibrium conversion (Panneman and Beenackers, 1992b;Marsman et al, 1988). Briefly, the experiments were performed in a packed bed reactor (i.d.…”

Section: Introductionmentioning

confidence: 99%