Temperature and dilution effects on MTO process with a SAPO-34-based catalyst in fluidized bed reactor

Zapater, Diego; Lasobras, Javier; Soler, J.; Herguido, J.; Menéndez, M.

doi:10.1016/j.cattod.2021.09.010

Cited by 9 publications

(11 citation statements)

References 63 publications

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“…This effect was larger for intermediate temperatures, such as 400 and 450 °C, in which conversion fell from 89.5 and 95.4% to 25.3 and 46.4%, respectively, than for low or high temperature. When the catalyst was deactivated, and the main reaction is the production of CH 4 and CO, the conversion increased with temperature, in agreement with previous reports. − …”

Section: Resultssupporting

confidence: 92%

“…The evolution of the byproduct (CH 4 + CO) yield was affected by temperature, because both the mechanism through which they were obtained and coke content are strongly dependent on temperature. 53 At low time on stream, byproduct yield increased with temperature. This effect was less relevant at low and intermediate temperature (between 350 and 500 °C), for which yield was smaller than 10%, than at high temperature (550 and 600 °C), for which yield increased up to 24 and 43%, respectively.…”

Section: ■ Results and Discussionmentioning

confidence: 98%

“…This effect could be attributed to the effect of water, which competes with olefins for the accessing of acidic sites and leads to desorption of olefins, which reduces the formation of long intermediates (or coke precursors). 10,24,25,53 Olefin yield and conversion changed with time on stream. Figure 12 shows the evolution of conversion and olefin yield if a mixture of methanol−water is fed (MeOH:H 2 O = 1:1) and if only methanol is fed (MeOH:H 2 O = 1:0).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…A last step of sieving was done to obtain the particle size distribution. To ensure smooth fluidization, the selected particle size of the final catalyst was the 160–315 μm fraction. ,, …”

Section: Methodsmentioning

confidence: 99%

“…To ensure smooth fluidization, the selected particle size of the final catalyst was the 160−315 μm fraction. 47,48,53 Catalyst Characterization. A detailed catalyst characterization was presented in a previous work.…”

Section: ■ Introductionmentioning

confidence: 99%

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Comparison of Conventional and Two-Zone Fluidized Bed Reactors for Methanol to Olefins. Effect of Reaction Conditions and the Presence of Water in the Feed

Zapater

Lasobras

Soler

et al. 2022

Ind. Eng. Chem. Res.

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The effect of water over the performance of the Methanol-to-Olefins process was studied in a conventional fluidized bed reactor (CFBR) and a two-zone fluidized bed reactor (TZFBR). Both of them contained the same SAPO-34-based catalyst, prepared by agglomeration with bentonite and alumina. In the first section of this paper, the performance was studied in the TZFBR for a wide range of temperatures (350−600 °C, ΔT = 50 °C), and two oxygen concentrations fed to the lower zone (7.5 and 10.8% for 500, 550, and 600 °C). In the second section, a comparison between the performance over the two previously mentioned reactors is presented, followed by a comparison between feeding water or not doing so to the TZFBR. Results showed that the TZFBR increased the initial yield to olefins and the production time of them, an effect that was increased by feeding a mixture of methanol−water (1:1 molar ratio) instead of pure methanol.

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