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doi:10.1595/147106709X481093 •Platinum Metals Rev., 2010, 54, (1)• Smopex ® -101 Styryl sulfonic acid grafted fibre Smopex ® -111 Styryl thiol grafted fibre SO 3 – H + SH NH + Cl – Smopex ® -105 Vinyl pyridine grafted fibre SH Smopex ® -234 Mercaptoethylacrylate grafted fibre Fig. 2. Examples of Smopex ® functional groups grafted onto polypropylene fibres (3) Case Study 1: Suzuki Reaction The process stream from a Suzuki coupling reaction using the catalyst trans-dichlorobis(triphenylphosphine)palladium(II) (PdCl 2 (PPh 3 ) 2 ) in toluene was analysed and found to contain 100 parts per million (ppm) of Pd as well as triphenylphosphine and inorganic salts. For Pd present following a reaction using PdCl 2 (PPh 3 ) 2 ,thiol-based scavengers are known to be the most suitable as they are able to break down any Pd complexes in the solution and bind strongly to the metal.An excess of Smopex ® was applied for the initial screening process at a rate of 1 wt% Smopex ® for 100 ppm Pd. In this case toluene was used as the process solvent, therefore hydrophobic fibres were recommended. A process temperature of 80ºC was used in the coupling step, but the preferred stage for Pd recovery was after the washing step, at a slightly lower temperature of 60ºC. Screening was carried out using Smopex ® -111 and Smopex ® -234, both thiol-based scavengers (see Figure 2). In both cases, 1 wt% of Smopex ® was stirred at 60ºC for 1 hour,the liquor was then filtered off and the filtrate was found to contain
EDITORIAL TEAM Editor David Jollie Assistant Editor Sara Coles Editorial Assistant Margery Ryan Senior Information Scientist Keith White E-mail: jmpmr@matthey.com Platinum Metals Review is the quarterly E-journal supporting research on the science and technology of the platinum group metals and developments in their application in industry http://www.platinummetalsreview.com/
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VOLUME 54 NUMBER 1 JANUARY 2010 Pla
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E-ISSN 1471-0676 •Platinum Metals
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