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- W2029338986 abstract "The aim of this study was the development of a crystallization process for the removal of the alkaline catalyst (cesium hydroxide) from crude polyether polyols and its recycling process. Hydrochloric, phosphoric, carbonic, and sulphuric acids were tested to choose the best neutralization agent. Sulphuric acid was chosen because its recycling process seems to be easier than with the other acids assayed. The process involves a first step of neutralization with an aqueous solution of sulphuric acid. After that, the removal of water must be done following an adequate profile of pressure and temperature with time to reach a large particle size that makes possible the filtration of the polyol. The influence of the water/polyol ratio and the P−T profiles were studied in order to decrease the process time and enlarge the size of the crystals. Once polyol is filtrated, the cake of Cs2SO4 was dissolved again to precipitate the sulphate ion with barium hydroxide, thus obtaining a solution of CsOH that can be recycled in the process. It has been confirmed that the recycled cesium hydroxide can be used in a new cycle." @default.
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- W2029338986 date "2009-12-23" @default.
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- W2029338986 title "Selection of a Purification Process for the Removal and Recycling of Cesium Catalyst after Polyol Production" @default.
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- W2029338986 doi "https://doi.org/10.1021/op900282v" @default.
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