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Using a membrane reactor.for Sucrose Hydrolysis： The Effect of reactor.s Design on Invertase Stability

Journal of Environmental Science and Engineering(A) 2013年第9期2卷 582-592页

作者： Francesco di Addezio Ester Junko Yoriyaz Laura Cantarella Maria Cantarella Michele Vitolo Department of lndustrial and lnformation Engineering and Economics University of L 'Aquila L 'Aquila 67100 Italy Department of Biochemical and Pharmaceutical Technology University of Sao Paulo S6o Paulo 05508900 Brazil Department of Civil and Mechanical Engineering University of Cassino and of Lazio Meridionale Cassino 03043 Italy

Invertase hydrolyses sucrose, produces inverted sugar syrup, which is used, mainly, as a food composition in industries. To carry out the hydrolysis properly, the invertase should be stable in the soluble form through a considerable reaction period and recovered afterwards. The chosen reactor.was a CSTR-type （continuous stirred tank reactor.type） coupled with an UFM （ultrafiltration-membrane）, the so-called MR （membrane reactor.. The varied parameters were： sucrose concentration （10-300 mM）, temperature （5-65 ℃）, reaction volume （14 mL and 65 mL）, stirring （100-500 rpm）, volumetric feeding rate （2.2-12 mL/h） and UFM MWCO （molecular weight cut off）（10, 20, 30, 50 and 100 kDa）. The invertase kinetic constants （KM = 23.5 mM; Vmax = 2,758 μmolgluJmin-mgprot; Ea = 9.1 kcal/mol） and the temperature deactivation energy （Ead= 20 kcal/mol） were calculated. Moreover, the invertase was unstable as the MR capacity diminished and the agitation increased up to 500 rpm most likely due to the damaging effect of shearing forces （present inside the MR） on the invertase molecule. Finally, both the MWCO and the chemical nature of the UFM affected the invertase stability along the hydrolysis. The enzyme stability increased as the UFM cut-off decreased, the highest value being observed with the 10 kDa-UFM.

关键词： Invertase sucrose membrane reactor.

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Life Cycle Assessment of Enriched Methane Produced by a Concentrated Solar Power Plant Coupled with a Steam Reforming Process

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Journal of Chemistry and Chemical Engineering 2011年第1期5卷 42-48页

作者： Vincenzo Piemonte Marcello De Falco Alberto Giaconia Pietro Tarquini Angelo Basile Gaetano Iaquaniello Department of Chemical Engineering Materials ＆ Environment University of Rome ＂La Sapienza＂ Rome Italy Faculty of Engineering University Campus Bio-Medico of Rome via Alvaro del Portillo 21 00128 Rome Italy ENEA-Casaccia Research Centre via Anguillarese 301 00123 Rome Italy CNR-1TM c/o University of Calabria Via Pietro Bucci Cubo 17/C 87030 Rende （CS） Italy Tecnimont-KT S.p.A. Viale Castello della Magliana 75 00148 Rome-Italy

The global energy related challenges, mainly due to the worldwide growing energy consumption gone with a reduction ofoil and gas availability, is leading to an increasing interest on hydrogen as energy carrier. Molten salts at temperatures up to 550 ~C can be used as solar heat carrier and storage system, and hydrogen selective membranes can be used to drive reforming reaction at lower temperatures than conventional （〈 550 ~C）, with hydrogen purification achieved thereby. The combination of new technologies such as membranes and membrane reactor., concentrating solar power （CSP） systems and molten salt heat carriers, allows a partial decarbonation of the fossil fuel together with the possibility to carry solar energy in the current natural gas grid. The aim of this work is to present a life cycle assessment of a novel hybrid plant for the production of a mixture of methane and hydrogen, called enriched methane, from a steam reforming reactor.whose heat duty is supplied by a molten salt stream heated up by an innovative concentrating solar power （CSP） plant developed by ENEA. The performance of this plant will be evaluated from an environmental point of view by the use of an LCA software （SimaPro7） and compared with the ones of traditional plants （reformer and cracker for the hydrogen production） for the production of enriched methane.

关键词： LCA CSP enriched methane steam reforming membrane reactor.

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