Abstract
We successfully demonstrated the effect of a membrane reactor for methanol synthesis to improve one-pass CO2 conversion. An Si-rich LTA membrane for dehydration from a methanol synthesis reaction field was synthesized by the seed-assisted hydrothermal synthesis method. The H2O permselective performance of the membrane showed 1.5 × 10−6 mol m−2 s−1 Pa−1 as H2O permeance and around 2000 as selectivity of H2O/MeOH at 473 K. From the results of membrane reactor tests, the CO2 conversion of the membrane reactor was higher than that of the conventional packed-bed reactor under the all of experimental conditions. Especially, at 4 MPa of reaction pressure, the conversion using the membrane reactor was around 60%. In the case of using a packed-bed reactor, the conversion was 20% under the same conditions. In addition, the calculated and experimental conversion were in good agreement in both the case of the membrane reactor and packed-bed reactor.
Highlights
Methanol (MeOH) is an important chemical for acetic acid and formaldehyde synthesis
We developed a membrane reactor for MeOH synthesis using an Si-rich LTA zeolite membrane to improve one-pass conversion compared with a conventional packed-bed reactor
We synthesized an Si-rich LTA zeolite membrane, and the membrane showed relatively high H2 O permselective performance compared with a conventional LTA membrane
Summary
Methanol (MeOH) is an important chemical for acetic acid and formaldehyde synthesis. MeOH synthesis from syngas as H2 , CO, and CO2 mixture is performed at high temperature (473–573 K) and high pressure (5–10 MPa) using Cu/ZnO as a catalyst in the industrial process. There is an issue that the one-pass yield of MeOH shows a low value owing to the limitation of equilibrium. H2 O permselective membrane is expected to improve one-pass yield. Nafion membranes for a MeOH synthesis membrane reactor [1,2]. Nafion membranes show relatively high separation performance at 473 K. It is difficult to apply the membrane to a MeOH synthesis membrane reactor because of thermal stability and mechanical strength
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