Browsing by Issue Date, starting with "2005-09"
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- Correlation directe de la variabilité climatique ocean-continent des derniers 25.000 ans a partir de l'analyse multi-proxy d'une carotte marine de la marge Nord-Ouest IbériquePublication . Naughton, Filipa; Sánchez Goñi, María Fernanda; Desprat, Stéphanie; Turon, Jean-Louis; Duprat, Josette; Cortijo, Elsa; Malaizé, Bruno; Joly, C.; Bard, Edouard; Rostek, Franke
- Definition of the Portuguese frameworks with international relevance as an input for the European geological heritage characterisationPublication . Brilha, José Bernardo; Andrade, César; Azerêdo, Ana Cristina; Barriga, Fernando; Cachão, Mário; Couto, Helena; Cunha, Pedro Proença e; Crispim, José António; Dantas, Pedro; Duarte, Luís Victor; Freitas, Maria da Conceição; Granja, Helena Maria; Henriques, Maria Helena; Lopes, L.; Madeira, José; Matos, João Xavier; Noronha, Fernando; Pais, João; Piçarra, José Manuel; Ramalho, Miguel Magalhães; Relvas, Jorge M.R.S.; Ribeiro, António; Santos, A.; Santos, Vanda Faria dos; Terrinha, Pedro
- Analysis of processing systems involving reaction and distillation : the synthesis of ethyl acetatePublication . Filipe, Rui M.; Castro, Pedro; Matos, Henrique A.; Novais, Augusto Q.The integration of reaction and separation into a single process unit, i. e., reactive destillation, may offer several advantages over conventional systems that use a reactor followed by a distillation column. In this paper we explore the operational characteristics of reactive distillation and highlight some of this potential benefits, using the production of ethyl acetate as an illustrative example. With this aim, the two types of system are compared employing different reactor types and a number of performance indicators, such as yield, conversion, purity, specific energy consumption and residence time. A sensitivity analysis is carried out on some variables and parameters, in order to explore and define the distillation columns operating conditions. As expected, results point to a clear advantage of reactive distillation allowing for the azeotrope to be surpassed and for the overcoming of chemical equilibrium, favouring an increase in conversion and product purity, along with reduced operating costs.