Main content area

Investigation of the efficiency of sorption-enhanced methanol synthesis process in circulating fast fluidized bed reactors

Abashar, M.E.E., Al-Rabiah, A.A.
Fuel processing technology 2018 v.179 pp. 387-398
adsorbents, carbon, carbon dioxide, carbon monoxide, feeds, fluidized beds, hydrogen, industry, mathematical models, methanol, temperature, thermodynamics
The concept of circulating fast fluidization with in-situ water removal using zeolite-4A particles is introduced to the methanol synthesis process. The mathematical model of a circulating fast fluidized bed reactor (CFFBR) is validated by an actual industrial plant data. Also, the industrial plant feed data is used to test the performance of a bubbling fluidized bed reactor (FBR). The CFFBR with varying adsorbent compositions is investigated. The system exhibits optimum conditions at a low feed temperature of 201.75 °C due to water removal and thermodynamic equilibrium shift. The methanol production has substantially increased about 14-folds. The increase of the adsorbent mass concentration >50.0% has a little effect on the maxima due to the total conversion of carbon. It is interesting to note that feeds rich in CO2 and lean in CO are susceptible to a significant improvement of methanol production. The sensitivity analysis shows that the increase of H2 in the feed decreases CO formation and consequently increases the carbon conversion to methanol. Moreover, the pressure is more effective at low ranges due to a high carbon conversion. The high efficiency shown by the CFFBR in this study suggests a promising application of these reactor generations in the methanol industry.