Modeling, simulation and control of dimethyl ether synthesis in an industrial fixed-bed reactor

2011 ◽  
Vol 50 (1) ◽  
pp. 85-94 ◽  
Author(s):  
M. Farsi ◽  
R. Eslamloueyan ◽  
A. Jahanmiri
Keyword(s):  
Dimethyl Ether ◽  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
Modeling Simulation ◽  
Dimethyl Ether Synthesis ◽  
Simulation And Control ◽  
And Control ◽  
Ether Synthesis

Systematic staging design applied to the fixed-bed reactor series for methanol and one-step methanol/dimethyl ether synthesis

2014 ◽  
Vol 70 (2) ◽  
pp. 1228-1237 ◽  
Author(s):  
Flavio Manenti ◽  
Andres R. Leon-Garzon ◽  
Zohreh Ravaghi-Ardebili ◽  
Carlo Pirola
Keyword(s):  
Dimethyl Ether ◽  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
Dimethyl Ether Synthesis ◽  
One Step ◽  
Ether Synthesis

Simulation of fixed bed reactor for dimethyl ether synthesis

2006 ◽  
Vol 23 (4) ◽  
pp. 522-530 ◽  
Author(s):  
Shin Beom Lee ◽  
Wonjun Cho ◽  
Dal Keun Park ◽  
En Sup Yoon
Keyword(s):  
Dimethyl Ether ◽  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
Dimethyl Ether Synthesis ◽  
Ether Synthesis

Studies on Deactivation of the Catalyst in Direct Dimethyl Ether Synthesis

2012 ◽  
Vol 10 (1) ◽  
Author(s):  
Haipeng Zhang ◽  
Wei Li ◽  
Wende Xiao
Keyword(s):  
Synergistic Effect ◽  
Dimethyl Ether ◽  
Catalyst Deactivation ◽  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
N2 Adsorption ◽  
Methanol Synthesis Catalyst ◽  
Dimethyl Ether Synthesis ◽  
Before And After ◽  
Ether Synthesis

Abstract Direct dimethyl ether (DME) synthesis from syngas has been increasingly attracted attentions. Relationship between the synergistic effect and the deactivation behavior of hybrid catalysts was studied in this paper. Two kinds of catalysts with different synergistic effect were tested in a fixed bed reactor and the catalysts before and after stability testing were characterized by XRD, N2-adsorption and TGA. Results show that the deactivation behavior of the catalyst is mainly caused by the deactivation of the methanol synthesis catalyst. Sintering of Cu particles is the main reason of the catalyst deactivation. In addition, coking during synthesis is another reason for the catalyst deactivation. Both the two reasons are deeply affected by the synergistic effect.

Dimethyl Ether Synthesis via Methanol Dehydration over Diatomite Catalyst Modified Using Hydrochloric Acid

2014 ◽  
Vol 931-932 ◽  
pp. 42-46 ◽  
Author(s):  
Watcharakorn Pranee ◽  
Pornsawan Assawasaengrat ◽  
Arthit Neramittagapong ◽  
Sutasinee Neramittagapong
Keyword(s):  
Hydrochloric Acid ◽  
Dimethyl Ether ◽  
Active Sites ◽  
Fixed Bed ◽  
Methanol Conversion ◽  
Catalytic Performance ◽  
Fixed Bed Reactor ◽  
Methanol Dehydration ◽  
Dimethyl Ether Synthesis ◽  
Ether Synthesis

The synthesis of dimethyl ether via methanol dehydration has been carried out over untreated-diatomite catalyst (DM) and hydrochloric acid modified treatment on diatomite catalyst (DMHC). The reactions were carried out in a fixed-bed reactor. The effects of hydrochloric acid modifications of diatomite on its catalytic performance were studied. The characterization such as XRD, SEM, FT-IR and FT-Raman had no deformation after HCl-modified treatment on catalysts. DMHC catalyst apparently gave the higher methanol conversion rate than DM due to the acidity while the selectivity of dimethyl ether from 250 to 350°C was slightly changed. The acidity was depended upon Al(IV) ions; nevertheless, both Al(V) and Al(VI) were affected and hence increasing the basic active sites. Not only was the competitively catalytic methanol dehydrogenation preferred with basic condition but also methanol-blocking water molecule interaction was the unwanted reaction. In this investigation, the chemical-bond arrangements of silicon and aluminium ions were proposed with solid MAS/NMR. The DMHC catalyst exhibited better DME yield than the DM catalyst, and it could be used as a selective catalyst for DME synthesis from methanol.

scholarly journals Process simulation of dimethyl ether synthesis via methanol vapor phase dehydration

2013 ◽  
Vol 15 (2) ◽  
pp. 122-127 ◽  
Author(s):  
Ziyang Bai ◽  
Hongfang Ma ◽  
Haitao Zhang ◽  
Weiyong Ying ◽  
Dingye Fang
Keyword(s):  
Dimethyl Ether ◽  
Vapor Phase ◽  
Process Simulation ◽  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
Reflux Ratio ◽  
Methanol Vapor ◽  
Operation Conditions ◽  
Dimethyl Ether Synthesis ◽  
Simulation Results

The production processes included catalytic dehydration of methanol in an adiabatic fixed-bed reactor and two columns product separations. In this study, the technological process for dimethyl ether (DME) synthesis is built on PRO/II platform based on the combined parameters of the reaction dynamic model for methanol dehydration reaction, the improved NRTL model of the liquid phase, the PR model of vapor phase. In order to validate the proposed model, the simulation results have been compared with the available data from a set of industrial production equipment with a production capacity of 200 000 tonnes per annum. A comparison between the calculated and measured results has proved that these results are satisfactory. The bed height and the volume of the catalytic bed are calculated aim at one million t/a DME yields and while taking account of high-purity DME production. After discussing the influence of feed stage location and reflux ratio for DME product purity, the suitable unit operation conditions are chosen. Accordingly, accurate process simulation results provide the basis and guidance for an improvement and development of the similar industrial device.

scholarly journals Validation of a Fixed Bed Reactor Model for Dimethyl Ether Synthesis Using Pilot-Scale Plant Data

Catalysts ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1522
Author(s):  
Daesung Song ◽  
Sung Yong Cho ◽  
Thang Toan Vu ◽  
Yen Hoang Phi Duong ◽  
Eunkyu Kim
Keyword(s):  
Dimethyl Ether ◽  
Fixed Bed ◽  
Pilot Scale ◽  
Fixed Bed Reactor ◽  
Average Error ◽  
Reactor Model ◽  
Feed Pressure ◽  
Co Conversion ◽  
Dimethyl Ether Synthesis ◽  
The One

The one-dimensional (1D) mathematical model of fixed bed reactor was developed for dimethyl ether (DME) synthesis at pilot-scale (capacity: 25–28 Nm3/h of syngas). The reaction rate, heat, and mass transfer equations were correlated with the effectiveness factor. The simulation results, including the temperature profile, CO conversion, DME selectivity, and DME yield of the outlet, were validated with experimental data. The average error ratios were below 9.3%, 8.1%, 7.8%, and 3.5% for the temperature of the reactor, CO conversion, DME selectivity, and DME yield, respectively. The sensitivity analysis of flow rate, feed pressure, H2:CO ratio, and CO2 mole fraction was investigated to demonstrate the applicability of this model.

Dimethyl Ether Synthesis via Methanol Dehydration over BEA Zeolite from Bagasse Fly Ash with Zircronium- and Nickel-Ion Exchange

2014 ◽  
Vol 931-932 ◽  
pp. 3-6 ◽  
Author(s):  
Watcharakorn Pranee ◽  
Pornsawan Assawasaengrat ◽  
Arthit Neramittagapong ◽  
Sasitorn Intarachit ◽  
Sutasinee Neramittagapong
Keyword(s):  
Fly Ash ◽  
Dimethyl Ether ◽  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
Beta Zeolite ◽  
Methanol Dehydration ◽  
Nickel Ion ◽  
Bagasse Fly Ash ◽  
Bea Zeolite ◽  
Dimethyl Ether Synthesis

The synthesis of dimethyl ether via methanol dehydration has been carried out over Beta zeolite (BEA) and ion-exchanged Beta zeolite from bagasse fly ash using hydrothermal method. The reactions were taken place in a fixed-bed reactor. The effects of nickel and zirconium ion-exchanged of BEA were investigated. Ni-BEA zeolite exhibited high methanol conversion rate and DME-resultant upon the reaction temperature from 200 to 225°C with equilibrium-limiting condition over 225°C; Furthermore, the Ni-BEA zeolite presented the best stable activity at 225°C over 1,200 minute. The Ni-BEA zeolite has also been interesting as a zeolite which suited to be one role importance to improve the properties for methanol dehydration to dimethyl ether.

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