Article ID Journal Published Year Pages File Type
68371 Journal of Molecular Catalysis A: Chemical 2007 6 Pages PDF
Abstract

The title complex is highly active and selective for the alternating copolymerisation of carbon monoxide and ethene in CH3COOH–H2O as a solvent. Under typical reaction conditions, 90 °C, 4.5 MPa, CO/ethene = 1/1, the productivity passes through a maximum of 15,500 gPK (gPd h)−1 when the concentration of the acid is 40% (mol mol−1), whereas the limiting viscosity number (LVN) increases upon increasing the acid concentration. Under the above conditions, but in the presence of sodium acetate, a polyketone (PK) of higher molecular weight is obtained, though at the expense of the productivity. Under higher pressure of ethene both productivity and LVN increase; under higher pressure of CO the productivity slightly decreases, whereas the LVN increases. These results are discussed taking into account the factors relevant to the chain growing and the termination processes.

Graphical abstract[PdCl2(dppf)] catalyses the CO–ethene copolymerisation in CH3COOH–H2O. Productivity is maximum when AcOH is 40% (mol mol−1) (15,500 g (gPd h)−1, 90 °C, 4.5 MPa, CO/ethene 1/1); the limiting viscosity number (LVN) increases upon increasing AcOH concentration; added NaAcO lowers the productivity and increases the LVN. Under higher ethene pressure productivity and LVN increase; under higher CO pressure productivity decreases, LVN increases. Figure optionsDownload full-size imageDownload as PowerPoint slide

Related Topics
Physical Sciences and Engineering Chemical Engineering Catalysis
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