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Preparation of thionyl chloride

Do dvouhrdlé a ground pour flask 20 g of phosphorus trichloride and Bank join the condenser (total reflux). The second stream of dry mouth are bringing carbon dioxide. Phosphorus pentachloride melts the heat of reaction. The reaction mixture should be mixed by repeatedly shaking apparatus. The reaction is complete when all the hard chloride, phosphorus enters into solution. After completion of the reaction replace condenser for downward thionyl chloride and the resulting separated by fractional distillation.

PCl5 + SO2 --> SOCl2 + POCl3

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