Impure aryltriazoles such as benzotriazole and tolyltriazole that are contaminated with dark colored imputities can be purified by conversion to an aryltriazole acid salt by treatment with aqueous acid. The aryltriazole acid salt is water soluble whereas the dark colored impurities are not. The aryltriazole acid salt solution is separated from the dark colored impurities and the aryltriazole is recovered by neutralization with base.
含有深色杂质的不纯芳基三唑,如苯并三唑和
甲苯三唑,可通过用
水酸处理转化为芳基三唑酸盐来纯化。芳基三唑酸盐是
水溶性的,而深色杂质则不是。芳基三唑酸盐溶液与深色杂质分离,然后通过中和处理来回收芳基三唑。