Funnels Furylacrylic acid

After cooling slightly, the reaction mixture is transferred to a large flask and treated with 3.5 1. of water. Part of this is used to rinse out the reaction flask. The mixture is boiled with 30 g. of Norite for about ten minutes and is filtered while still hot with suction, using a preheated Buchner funnel. Furylacrylic acid tends to separate quickly and sometimes offers trouble in clogging the funnel. The filtrate is acidified to Congo red by the addition of a 1 1 solution of concentrated hydrochloric acid in water. 

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