To meet the demand for high purity TEA in domestic market, 99% high purity triethanolamine (TEA) was prepared by a route using low purity TEA as raw material.
为满足国内市场对高纯度三乙醇胺的需求，采用以低纯度三乙醇胺为原料的生产路线，获得含量99％的高纯度三乙醇胺。
The first route was using the liquid bromine to aromatize the 4-chlorotetrahydrophthalic anhydride to 4-chlorophthalic anhydride, The yield was 89%, and the purity was more than 99%.
第一种方法：用液溴作芳化试剂，将4-氯代四氢苯酐芳化为4-氯代苯酐，收率达到89%，纯度大于99%；
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