Anion exchanger resins for purificn. of fruit juice - based on poly-aryl-ether! sulphone(s)! giving improved heat stability

摘要

New anion exchange resins contain poly (aryl ether sulphone) units of formula (I). In (I), R1 and R2 are H, 1-6C alkyl or phenyl; x is 1, 2 or 3; y is 0 or 1. The aromatic rings are sepd. from the SO2 gp. by at least one aromatic ring substd. with -CnH2nNR3R4 or -CnH2nN+R3R4R5Y-, in which R3 R4 and R5 are 1-6C alkyl opt. substd. with OH; n is a whole number; Y- is an anion. Used for purificn. of sugar-contg. fruit juices contg. coloured degradation products resulting from heat treatment, and other applicns. involving heat and alkalis. Improved heat stability is achieved with heat deformation temp. around 200 degrees C compared with around 95 degrees C for usual polystyrene ion exchanger resins, allowing use in hot solns. Increased resistance to hot bases used to regenerate the resin.