Fractionation of benzene/n-hexane mixtures by pervaporation using polyurethane membranes



Document title: Fractionation of benzene/n-hexane mixtures by pervaporation using polyurethane membranes
Journal: Brazilian journal of chemical engineering
Database: PERIÓDICA
System number: 000308622
ISSN: 0104-6632
Authors: 1

Institutions: 1Universidade Federal do Rio de Janeiro, Instituto Alberto Luiz Coimbra de Pos-Graduacao e Pesquisa de Engenharia, Rio de Janeiro. Brasil
Year:
Season: Sep
Volumen: 16
Number: 3
Pages: 297-308
Country: Brasil
Language: Inglés
Document type: Artículo
Approach: Experimental, aplicado
English abstract In the present work polyurethane membranes obtained from different polyester/MDI-based polymers were used to separate benzene/n-hexane mixtures by pervaporation. In pervaporation experiments, with a 50% wt feed at room temperature, permeate fluxes in the range of 0.3 to 3.2 Kg/m2h (10 <FONT FACE="Symbol">m</font>m membrane thickness) and selectivity in the range of 3.8 to 5.6 were obtained. The permeate was always enriched in benzene. Taking into account the compromise between flux and selectivity, the best performance membrane was selected for complementary sorption and pervaporation experiments. Results show that selectivity increases and the permeation flux decreases when the benzene concentration in the feed decreases. In the present application, results also show that sorption is the main factor for selectivity. Using the distillation azeotropic mixture as feed, almost no influence of temperature on selectivity was observed in the range of 25oC to 56oC. The permeate flux increases seven-fold, while selectivity remains constant near 8.0
Disciplines: Química
Keyword: Química orgánica,
Ingeniería química,
Pervaporación,
Membranas de poliuretano,
Separación orgánica,
Benceno-hexano
Keyword: Chemistry,
Organic chemistry,
Chemical engineering,
Pervaporation,
Polyurethane membranes,
Organic separation,
Benzene-hexane
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