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Weak acid polycondensation type cation exchange resin
The first synthesized carboxylic acid type cation exchange resin is formed by polycondensation of 3,5-dihydroxybenzoic acid and formaldehyde
The exchange capacity of this resin can reach about 7 meq/q
Dissolve 20g of 2,4-dihydroxybenzoic acid in alkaline water, add 10g of sodium chloride and 6g of phenol, then cool in ice brine, add 44g of formaldehyde dropwise with stirring, and react at 40°C (about 50min) to It becomes a dark red viscous resin paste
Use soluble starch, Na 2 SO 4 or NaC1 as porogen to polycondensate salicylic acid and formaldehyde.
The above weak acid resin has good adsorption performance for vitamin B 2 and also has a good effect on decolorization of streptomycin sulfate eluate