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用稀植酸代替无机酸溶解菲丁，通过阳离子交换制得的稀植酸溶液（省略阴离子操作），经２％活性炭脱色及真空浓缩制备出浓度为７０％～９０％的商品植酸。
Dilute phytic acid was used instead of inorganic acid to dissolve phenidium, and the diluted phytic acid solution was obtained by cation exchange (the anion was omitted). The product phytic acid was prepared by decolorization with 2% activated carbon and concentration in vacuo.