Synthesis of dimethyl ether from syngas in a microchannel reactor—Simulation and experimental study

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

doi:10.1016/j.cej.2010.09.080

Cited by 61 publications

(39 citation statements)

References 16 publications

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“…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%

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: Methodsmentioning

confidence: 99%

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

et al. 2016

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“…Catalyst morphology changes often occur on copper catalysts due to continuous change between Cu + and Cu(0) species in methanol synthesis or methanol steam reforming to hydrogen. However, no issue was observed in the work of Bakhtiary et al (2011) andHayer et al (2011). The aspect of residues from reaction can be much more challenging in the case of Fischer-Tropsch synthesis like in the work from Myrstad et al (2009).…”

Section: Deactivation Rate Versus Catalyst Regeneration / Removalmentioning

confidence: 79%

Application of Catalysts to Metal Microreactor Systems

Pfeifer¹

2012

Chemical Kinetics

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“…The corresponding energy and exergy losses were assumed to be 0.5 MJ/kg CO 2 and 0.1 MJ/kg CO 2 , respectively. Furthermore, we assumed a consumption of 1.5 kg MEA per ton CO 2 according to the published literature; 35 (5) according to Szargut's model, the reference state in the present work is P 0 (1 atm), T 0 (298.15 K) and contains 75.6%v/v of N 2 , 20.34%v/v of O 2 , 3.12%v/v of H 2 O, 0.03%v/v of CO 2 , and 0.91%v/v of Ar.…”

Section: Resultsmentioning

confidence: 99%

“…3,4 Most of the studies to date have concentrated on the preparation of biomass-derived syngas and/or investigation of DME synthesis-like catalysts and reaction apparatuses. [5][6][7] Nevertheless, very little attention has been devoted to the systematic study of the comprehensive performance of an integrated bio-DME system, and operating commercial bio-DME plants are currently extremely scarce. To enhance the competition of bio-DME with fossil-based fuels, the integrated bio-DME system should be improved to be as efficient as possible prior to application.…”

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Integrated energy-exergy-based evaluation and optimization of a bio-dimethyl ether production system via entrained flow gasification

Xiang

Zhou

Chen

et al. 2014

Journal of Renewable and Sustainable Energy

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In this paper, an integrated energy-exergy-based evaluation was conducted on an entire bio-dimethyl ether (bio-DME) system established using ASPEN PLUS. The system contained a novel combination of biomass torrefaction unit (BTU) and entrained-flow gasification (EFG) followed by single-step DME synthesis, including DME purification, as well as heat recovery and cogeneration. The mass and energy balances were calculated in detail and compared with those cited in previous literature. The overall energetic and exergetic efficiencies of the system were found to be 55.2% and 46.9%, respectively. The exergy rates for all processes involved in the system were calculated and the locations as well as magnitudes of exergy losses were determined. Subsequently, the causes of exergy losses were deeply analyzed followed by pointing out the corresponding improvement potentials. Further investigation indicated that considerable improvement could be achieved for BTU and EFG, where the largest and second largest exergy loss took place. According to the parametric investigation based on energetic and exergetic efficiencies, controlling the BTU and EFG operation at 250 C and 1200 C, respectively, was proposed to improve the efficiency of the system and increase the overall exergetic efficiency to 52.6% while reducing the total exergy losses by 5.7%. V C 2014 AIP Publishing LLC. [http://dx.

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Synthesis of dimethyl ether from syngas in a microchannel reactor—Simulation and experimental study

Cited by 61 publications

References 16 publications

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

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

Application of Catalysts to Metal Microreactor Systems

Integrated energy-exergy-based evaluation and optimization of a bio-dimethyl ether production system via entrained flow gasification

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