HAZEL Webinar 3 Place image in this area

HAZEL Webinar 3: Place image in this area. Membrane reactors for hydrogen production Adele Brunetti 20 th October 2020

Institute on Membrane Technology , ITMCNR ITM-CNR Institute for Membrane Technology, ITM–CNR, Via P. Bucci cubo 17 C, 87036 Rende CS, Italy HAZEL Webinar 3: H 2 Safety, analysis, measurements and applications.

Hydrogen production The great majority (>90%) of hydrogen is used by oil refineries and petrochemical plants to refine fuel, and in ammonia synthesis, … Pure hydrogen is also required , e. g. PEM-FC Hydrogen production from carbon containing source produce CO 2 HAZEL Webinar 3: H 2 Safety, analysis, measurements and applications.

Hydrogen – Membrane Reactors PEMFC Pure H 2 CO 2 Concentrated stream CH 4 METHANE pipeline EU-FP 6 - HYDROFUELER and GRACE projects HAZEL Webinar 3: H 2 Safety, analysis, measurements and applications.

Membrane reactors for H 2 production HH Permeation HH HH Pd alloy Membran e HH HH H 2 2 H 2 H 2 HAZEL Webinar 3: H 2 Safety, analysis, measurements and applications.

WGS is a reaction limited by thermodynamic equilibrium. In the case of the upgrading of a syngas mixture, the relevant presence of reaction products (50% of H 2) strongly depletes the CO conversion. . . Due to Hydrogen removal ØPure hydrogen permeate stream ØHigh Hydrogen Recovery ØMR Conversion higher than TR one ØLower reaction volume with respect to TR Possibility to: Ø achieve CO conversion 3 -4 times higer than TR (in the same operating conditions) Brunetti A. , Caravella C. , Barbieri G. , Drioli E. , “Journal on membrane science, 2007, Vol 306/1 -2 pp 329 -340. Drioli E. , Brunetti A. , Di Profio G. , Barbieri G. , Green Chemistry, 2012, 14, 1561 -1572 HAZEL Webinar 3: H 2 Safety, analysis, measurements and applications.

Upgrading of a stream coming out by reformer (H 2 ca. 45%; CO 50%; CO 2 5%; N 2 balance) Water Gas Shift Process of high industrial interest for H 2 production CO+H 2 O = CO 2 + H 2 Reforming HAZEL Webinar 3: H 2 Safety, analysis, measurements and applications.

HT-WGS in Pd-based MR Barbieri G. , Brunetti A. , Caravella A. , Drioli E. , “Pd-based Membrane Reactors for one-stage Process of Water Gas Shift”, RSC Adv. , 2011, 1 (4), 651 -661 HAZEL Webinar 3: H 2 Safety, analysis, measurements and applications.

CO conversion in MR The CO conversion of MR is • ca. 10% higher than the whole traditional process • ca. 33% higher than the first stage of the traditional process • ca. 25 -30% higher than TREC. HAZEL Webinar 3: H 2 Safety, analysis, measurements and applications.

Outlet stream compositions One stage MR hydrogen recovered o Pure in the permeate o the retentate is compressed and concentrated in CO 2 (65% molar). Traditional process o H 2 exiting from the traditional process (at more or less 60% molar) is still mixed with the other gases and, in particular, with ca. 5. 5% CO. o CO 2 concentration of the residual stream concentration cannot exceed 60%, considering the actual separation efficiency of industrial PSA, where the H 2 recovery does not exceed 80 -90% HAZEL Webinar 3: H 2 Safety, analysis, measurements and applications.

Volume Index HAZEL Webinar 3: H 2 Safety, analysis, measurements and applications.

Ratio between the MR volume and volume of the traditional process H 2 O/CO feed molar ratio, - Volume Index, % 1 13 3 21 5 33 The reaction volume required by MR results always lower than that of the whole traditional process and it is much lower with a much higher feed pressure HAZEL Webinar 3: H 2 Safety, analysis, measurements and applications.

Conclusions MRs is a valuable/interesting alternative to TRs in Hydrogen production by Syngas conversion Both new (volume and conversion) indexes show the large advantage of MR use More profitable operating conditions, e. g. higher temperature, can be used improving kinetics and the overall process efficiency Large amount (80 -90%) of produced Hydrogen is obtained as a pure stream … the other stream is CO 2 rich HAZEL Webinar 3: H 2 Safety, analysis, measurements and applications.

HAZEL Webinar 3: H 2 Safety, analysis, measurements and applications.

Institute for Membrane Technology, ITM–CNR, Via P. Bucci cubo 17 C, 87036 Rende CS, Italy HAZEL Webinar 3: H 2 Safety, analysis, measurements and applications.