Statistical Analysis of Olefins Yield in Fixed Bed Conversion of Dimethyl Ether

Sardesai, Abhay; Tartamella, Timothy; Midha, Chand K.; Lee, Sung‐Gyu

doi:10.1080/08843759608947603

Cited by 3 publications

(2 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This process has been studied in great detail [45][46][47][48][49][50][51][52][53][54]. Research studies have also been conducted to examine the conversion of dimethyl ether into gasolinerange hydrocarbons [55][56][57], lower olefins [58][59][60][61], and methyl acetate [62]. Research efforts by Air Products and Chemicals in this area have been mentioned [63].…”

Section: Introductionmentioning

confidence: 99%

Liquid phase methanol and dimethyl ether synthesis from syngas

2005

Self Cite

View full text Add to dashboard Cite

The Liquid Phase Methanol Synthesis (LPMeOH TM ) process has been investigated in our laboratories since 1982. The reaction chemistry of liquid phase methanol synthesis over commercial Cu/ZnO/Al 2 O 3 catalysts, established for diverse feed gas conditions including H 2 -rich, CO-rich, CO 2 -rich, and CO-free environments, is predominantly based on the CO 2 hydrogenation reaction and the forward water-gas shift reaction. Important aspects of the liquid phase methanol synthesis investigated in this in-depth study include global kinetic rate expressions, external mass transfer mechanisms and rates, correlation for the overall gas-to-liquid mass transfer rate coefficient, computation of the multicomponent phase equilibrium and prediction of the ultimate and isolated chemical equilibrium compositions, thermal stability analysis of the liquid phase methanol synthesis reactor, investigation of pore diffusion in the methanol catalyst, and elucidation of catalyst deactivation/regeneration. These studies were conducted in a mechanically agitated slurry reactor as well as in a liquid entrained reactor. A novel liquid phase process for co-production of dimethyl ether (DME) and methanol has also been developed. The process is based on dual-catalytic synthesis in a single reactor stage, where the methanol synthesis and water gas shift reactions takes place over Cu/ZnO/Al 2 O 3 catalysts and the in-situ methanol dehydration reaction takes place over c-Al 2 O 3 catalyst. Co-production of DME and methanol can increase the single-stage reactor productivity by as much as 80%. By varying the mass ratios of methanol synthesis catalyst to methanol dehydration catalyst, it is possible to co-produce DME and methanol in any fixed proportion, from 5% DME to 95% DME. Also, dual catalysts exhibit higher activity, and more importantly these activities are sustained for a longer catalyst on-stream life by alleviating catalyst deactivation.

show abstract

Section: Introductionmentioning

confidence: 99%

Liquid phase methanol and dimethyl ether synthesis from syngas

2005

Self Cite

View full text Add to dashboard Cite

show abstract

“…In addition, the experimental conditions were chosen such that a maximization of the C 5 + fraction could be reached. At higher temperatures, undesired increased formation of C 2 = -C 4 = olefins was observed by other authors. − …”

Section: Resultsmentioning

confidence: 54%

DME-to-Hydrocarbon over an MFI Zeolite: Product Selectivity Controlled by Oxygenates under the Kinetic Regime

Ortega

Kolb

2019

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

The influence of process variables on the DME-to-hydrocarbon (DtH) conversion has been assessed. The reaction was studied at atmospheric pressure, over an MFI zeolite (H-ZSM-5, SiO2/Al2O3 = 58), in a gradientless recycle reactor, under the kinetic regime, and process variables in the range of 598–648 K and space time in the range of 0.008–0.040 h kgcat kgDME –1. The results showed that DME and methanol are not in equilibrium, that the cis-/trans-C4 olefins are in equilibrium with each other but not with the 1-butene, while C5 + hydrocarbons are favored at high oxygenates conversion. Finally, it was observed for the first time, to best of the knowledge of the current authors, that under kinetically controlled conditions, the selectivity to main groups of products can be described by the oxygenates conversion (x oxy), independently of the process conditions, which means that the x oxy controls the process selectivity independently of reaction temperature and space time.

show abstract