New Chiral Catalytic Membranes Created by Coupling UV-Photografting with Covalent Immobilization of Salen–Co(III) for Hydrolytic Kinetic Resolution of Racemic Epichlorohydrin

• Published in: Industrial & engineering chemistry research Vol. 51; no. 28; pp. 9531 - 9539
• Main Authors: Zhao, Zhi-Ping, Li, Mei-Sheng, Zhang, Jia-Yin, Li, Hui-Na, Zhu, Peng-Peng, Liu, Wen-Fang
• Format: Journal Article
• Language: English
• Published: Washington, DC American Chemical Society 18.07.2012
• Subjects: Applied sciences; Catalysis; Catalysts; Catalytic reactions; Chemical engineering; Chemistry; Epichlorohydrin; Exact sciences and technology; Fibers; General and physical chemistry; Immobilization; Membranes; Polyethylenes; Reaction kinetics; Reactors; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; Immobilization; Ultraviolet radiation; Catalytic reaction; Kinetics
• ISSN: 0888-5885; 1520-5045
• DOI: 10.1021/ie3011935

New chiral catalytic functional membranes (HFM-salens) were obtained successfully by covalent immobilizing aminated mono-CH2Cl–salen–Co(III) catalysts onto polyethylene (PE) hollow fiber membranes (HFMs) that had been, in advance, modified by UV-induced graft polymerization of acrylic acid. The catalytic properties of HFM-salens were investigated by carrying out hydrolytic kinetic resolution experiments of racemic epichlorohydrin. For homogeneous mono-CH2Cl–salen–Co(III) catalyst, the enantioselectivity (ee) and yield (Y) of S-epichlorohydrin were 86.67% and 57.26%, respectively. For the HFM-salens in type of segments, on which only about 2% of mono-CH2Cl–salen–Co(III) used in homogeneous catalysis was immobilized, an ee of 5.45% and a Y of 8.23% were achieved. Moreover, the ee and Y values reached 44.78% and 47.01%, respectively, using only eight HFM-salens packed in a catalytic membrane reactor (CMR), and the ee and Y values can be further improved by increasing packing density of fibers in the CMR. As an environment-friendly technology, immobilization of catalysts on membranes makes it easy to reuse the catalysts and reduce the amount of catalysts significantly. The results offer great potential for these modified membranes in the CMR for further research.