III International Conference

PP-III-20CATALYTIC MEMBRANE CONTACTOR/REACTOR FOR DEEP REMOVAL OFDISSOLVED OXYGEN FROM WATERPetrova I., Lebedeva V., Volkov V., van Erkel J. 1 , van der Vaart R. 1, 2 , Tereshchenko G. 1A.V. Topchiev Institute of Petrochemical Synthesis RAS, Moscow, Russia1 TNO Science and Industry, Apeldoorn, The Netherlands2 Shell Global Solutions International, Rijswijk, The NetherlandsE-mail: ivpetrova@ips.ac.ruThis work describes the development of a catalytic Pd-loaded polypropylene poroushollow fiber membrane contactor for removal of dissolved oxygen from water.The lab-scale catalytic membrane module was prepared and coated with Pd catalyst byex-situ and in-situ methods. The commercially available membrane contactor was coatedintegrally as delivered, without disassembly. The concentration of dissolved oxygen in waterwas reduced to the sub-ppb level by catalytic reaction with Pd-loaded commercially Celgardmembrane contactor/reactor.Dissolved oxygen is one of the major contaminants to be removed for the production ofultra-pure water, e.g., for the semiconductor industry or for boiler feed water preparation inelectricity production. Also, in the brewing of beer (heavy brewing) and in the oil & gasindustry (injection water) oxygen removal is important.For the removal of oxygen to very low levels, catalytic reduction with hydrogen is anattractive method. This work describes the development of a catalytic Pd-loadedpolypropylene porous hollow fiber membrane contactor for this purpose. The commerciallyavailable Membrana Liquicel contactor module was impregnated with a palladium catalyst byan in-situ method.The method of chemical deposition of Palladium was used for the reduction of palladiumsalts by an aliphatic alcohol [1]. The method for the coating of single hollow fiber membraneand principle of removal of dissolved oxygen from water by Pd-loaded polypropylene poroushollow fiber membranes have been described in earlier work [2].Subsequently, after development of the method for the coating of single membrane fibres,the method was adapted for the in-situ coating of a complete commercially availablemembrane module (1.4 m 2 of membrane surface area). As an intermediate step, custom mademodules with a glass outer tube were coated.The removal of dissolved oxygen from water by catalytic membrane contactor/reactorwas studied in a flow-through system in both once-through and recirculation mode. The505