| 摘要 |
PROBLEM TO BE SOLVED: To produce 1,5-pentanediol free from impurities to lower the polymerization reaction rate in the case of using the diol as a soft segment of polycarbonate diol and polyester polyol or as a chain extender as it is for a raw material of polyurethane, polyester resin, etc. SOLUTION: The 1,5-pentanediol contains <=0.1 wt.% each of 1,5-hexanediol and 1,4-dihydroxycyclohexane. The 1,5-pentanediol can be produced by the direct hydrogen reduction of a dicarboxylic acid mixture in the filtrate obtained by the crystallization and separation of adipic acid.
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