Dibasic Alcohol are one of the main raw materials for the synthesis of polyester polyols. Compared with ordinary diols, polyester polyols produced from 1,6-hexanediol (HDO) can give products excellent mechanical properties and hydrolysis resistance, and are very suitable for use in mid- to high-end products and products with special performance requirements. In addition, 1,6-hexanediol (HDO) can also be used for the production of light-curing monomer HDDA, can be used for the synthesis of polyester resins, can be used for the production of epoxy resin diluent 1,6-hexanediol (HDO), can also be used for the production of pharmaceutical intermediates and other products. Polyurethane and polyester resin products produced with 1,5-pentanediol (PDO) have excellent low-temperature resistance and outstanding overall performance. In addition, 1,6-hexanediol (HDO) and 1,5-pentanediol (PDO) are also the main raw materials for the production of polycarbonate diol (PCDL).