Characteristics of integrated micro packed bed reactor-heat exchanger configurations in the direct synthesis of dimethyl ether

Hayer, Fatemeh; Bakhtiary-Davijany, Hamidreza; Myrstad, Rune; Holmén, Anders; Pfeifer, Peter; Venvik, Hilde J.

doi:10.1016/j.cep.2013.03.021

Cited by 41 publications

(38 citation statements)

References 35 publications

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“…Considering that the CO conversion level in the present study is lower compared to the ones in Ref. 24 and 21, similar or somehow larger diffusivities ensure that the diffusion rates surpass reaction kinetics. The same is valid for the CO 2 diffusivity.…”

Section: Mass Transfer Limitationsmentioning

confidence: 75%

“…The reactor consists of a 6 cm long reaction slit with rectangular cross section of 8.8 × 1.5 mm 2 , sandwiched between cross flow channels for circulation of a heat transfer oil. Such reactors have been studied earlier under similar operating conditions for the methanol [21][22][23] and the direct DME [24][25][26] syntheses, and established as practically isothermal, isobaric, free from mass transfer limitations, and with a narrow residence time distribution. Premixed synthesis gas with H 2 to CO molar ratio of either 1 (Syngas-1) or 2 (Syngas-2) was used as feed.…”

Section: Methodsmentioning

confidence: 99%

“…Introduction of water to the reaction environment was done by evaporating the pressurized deionized water into the feed stream using a Controlled Evaporator Mixer (Bronkhorst). The reaction temperature was monitored by measuring the reactor skin temperature using thermocouples inserted into the holes in the reactor housing which provide a proximity to the reaction slit on top of its centerline [24]. The tubing was heated to avoid condensation of water, methanol and other possible liquid products.…”

Section: Methodsmentioning

confidence: 99%

“…Manipulation of the reactants' diffusivities by syngas dilution with He or Ar was performed earlier in our group [21,24] to demonstrate that both methanol and direct DME syntheses in similar microchannel reactors and under an identical range of operating conditions are free from mass transfer limitations. A summary of the results is also presented in Figure 9.…”

Section: Mass Transfer Limitationsmentioning

confidence: 99%

“…The methanol and DME syntheses from the standard synthesis gases applied, are considered free from mass transfer limitations based on our previous studies [21,24]. However, changes in gas composition and pressure, alter the diffusivities of the components in a gas mixture.…”

Section: Mass Transfer Limitationsmentioning

confidence: 99%

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Direct dimethyl ether synthesis from synthesis gas: The influence of methanol dehydration on methanol synthesis reaction

et al. 2016

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Direct dimethyl ether (DME) synthesis from synthesis gas is studied with regard to potential effects of methanol dehydration on methanol formation and copperbased catalyst performance. For this, the influence of the operating conditions (space velocity, temperature, pressure, time-on-stream and syngas composition) on activity, selectivity and stability of the catalyst was studied and compared for methanol synthesis and direct DME synthesis. The advantage of the direct over the two-step DME synthesis is apparent at conditions where syngas conversion to methanol is thermodynamically limited. However, under the applied operating conditions, results suggest that combining methanol synthesis and dehydration has a negative effect on the methanol formation kinetics. The origin of the observed phenomena is investigated by varying dehydration catalyst and by introducing dehydration products (DME and water) into the methanol synthesis feed. Choice of the solid acid catalyst does not seem to affect methanol formation, and DME is also found to be practically inert over the methanol synthesis catalysts. Water injection, on the other hand, led to a significant decrease in the methanol synthesis rate. Thus, formation of an additional amount of water through methanol dehydration might be an explanation for the lower methanol formation rate in the direct DME synthesis.

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Section: Mass Transfer Limitationsmentioning

confidence: 75%