As people’s awareness of environmental protection has increased, the use of environmentally friendly chemical materials such as 1,6-hexanediol and 1,5-pentanediol has become more widespread, and research in this field in our country has only just begun. Most rely on imports. The reporter learned from the Dalian Institute of Chemicals, Chinese Academy of Sciences on February 25th that this situation is expected to change soon. The Institute and Liaoyang Petrochemical Company have jointly developed the synthetic process of 1,6-hexanediol and 1,5-pentanediol, and determined the best process conditions through small-scale test and simulation amplification experiments, which provided the basis for the scale-up of the pilot test.
The synthesis of 1,6-hexanediol employs a two-step process route of esterification and rehydrogenation of 1,6-hexanedioic acid. The esterification process uses strong acid type ion exchange resin instead of traditional inorganic acid catalyst to overcome the corrosion and pollution problems brought about by the use of inorganic acid catalysts used in traditional esterification technology; at the same time, continuous esterification technology is used instead of traditional intermittent esterification process. The conversion rate was over 98%, the selectivity of 1,6-hexanediol was more than 95%, and the purity of the product after distillation reached more than 99%.
The study of 1,5-pentanediol completed the research on the hydrogenation catalyst's setting, hydrogenation process conditions and catalyst stability, and achieved good experimental results: esterification at lower reaction pressures. The conversion rate of the reaction is more than 99%, the selectivity of 1,5-pentanediol is more than 92%, and the purity is more than 99%. In particular, in the process of hydrogenation of 1,5-pentanediol, a new type of high-efficiency catalyst was used, which greatly reduced the reaction pressure.
1,6-hexanediol and 1,5-pentanediol are important chemical raw materials. The former is mainly used as raw materials for new polyesters, coatings, adhesives, sealants and plasticizers. The latter is widely used. For the production of polyurethanes, polyesters, plasticizers, perfumes, synthetic lubricants, and dispersion fuels.
The synthesis of 1,6-hexanediol employs a two-step process route of esterification and rehydrogenation of 1,6-hexanedioic acid. The esterification process uses strong acid type ion exchange resin instead of traditional inorganic acid catalyst to overcome the corrosion and pollution problems brought about by the use of inorganic acid catalysts used in traditional esterification technology; at the same time, continuous esterification technology is used instead of traditional intermittent esterification process. The conversion rate was over 98%, the selectivity of 1,6-hexanediol was more than 95%, and the purity of the product after distillation reached more than 99%.
The study of 1,5-pentanediol completed the research on the hydrogenation catalyst's setting, hydrogenation process conditions and catalyst stability, and achieved good experimental results: esterification at lower reaction pressures. The conversion rate of the reaction is more than 99%, the selectivity of 1,5-pentanediol is more than 92%, and the purity is more than 99%. In particular, in the process of hydrogenation of 1,5-pentanediol, a new type of high-efficiency catalyst was used, which greatly reduced the reaction pressure.
1,6-hexanediol and 1,5-pentanediol are important chemical raw materials. The former is mainly used as raw materials for new polyesters, coatings, adhesives, sealants and plasticizers. The latter is widely used. For the production of polyurethanes, polyesters, plasticizers, perfumes, synthetic lubricants, and dispersion fuels.
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