期刊
CHEMICAL ENGINEERING JOURNAL
卷 302, 期 -, 页码 801-810出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2016.05.096
关键词
Dimethyl ether; Methanol; Olefins; HZSM-5 zeolite; Kinetic model
资金
- Ministry of Economy and Competitiveness of the Spanish Government
- FEDER funds [CTQ2010-19188, CTQ2013-46173-R]
- Basque Government [IT748-13]
- University of the Basque Country [UFI 11/39]
- Ministry of Economy and Competitiveness of the Spanish Government [BES-2011-046266]
A kinetic model of 11 lumps (dimethyl ether, methanol, water, ethylene, propylene, butenes, C-2-C-4 paraffins, C5+, hydrocarbons, BTX aromatics, methane and CO) has been determined for the reaction of DME to olefins (DTO process) over a HZSM-5 zeolite catalyst (SiO2/Al2O3 = 280) agglomerated with boehmite. The experiments have been carried out under a slightly above than at 1.5 bar in an isothermal fixed bed reactor under a wide range of operating conditions: 598-673 K; space time, 0.2-6 g(cat) h mol(C)(-1); feed, pure DME and co-fed with He, methanol and water. The model characterizes the effect of the reaction conditions (temperature, space time and feed composition) over the product distribution at zero time on stream. The kinetic constant of DME conversion to olefins (at 623 K) is 20 times greater than that of methanol conversion. This result and the non-existence of the methanol dehydration step are the main differences between both processes. These differences have a great impact on the advance of the reaction and on the yield and distribution of product fractions. (C) 2016 Elsevier B.V. All rights reserved.
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