HBTHF is the main impurity in BDO products, which is difficult to be separated by distillation. The substance is easy to oxidize and develop color, affecting BDO polymerized products' quality. The requirement of acetal content in the polymerized 1, 4-butanediol market is less than 0.1％ (mass fraction). In this paper, the method of acetal hydro-refining BDO was studied, the applicability of this process to raw materials was discussed, the factors affecting BDO refining were analyzed and optimized, and the stability experiment was done. The experimental results showed that the acetal mass fraction in BDO was reduced to less than 0.1％ by refining 1,4-butanediol from high boiling point tower, and the catalyst had good stability. The BDO refining process is simple, the reaction conditions are mild, the process flow is safe and environmental protection, and it is helpful to improve the quality and efficiency of BDO manufacturers.
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