| 摘要 |
A first invention group is characterized by 1,3-butylene glycol which, at a period of three months after production, exhibits potassium permanganate color-fading time of at least five minutes as measured according to JIS K1351 3.10. A second invention group is characterized in that, when 1,3-butylene glycol is synthesized through hydrogenation of acetaldols in the presence of a catalyst, Raney nickel having an acetone hydrogenation activity of 2,000 ml/g-Ni/hr or more and/or a phenol hydrogenation activity of 500 ml/g-Ni/hr or more is used as the catalyst. A third invention group is characterized in that acetaldols obtained through condensation of acetaldehyde in the presence of a basic catalyst are hydrogenated in the presence of a hydrogenation catalyst and under an acidic condition. A fourth invention group is characterized in that acetaldols obtained through condensation of acetaldehyde in the presence of a basic catalyst is hydrogenated in the presence of a catalyst, to thereby synthesize 1,3-butylene glycol; a hydrogenation crude mixture is basified; alcohols are removed from the basified crude mixture; and 1,3-butylene glycol is obtained as a distillate and purified. A fifth invention group is characterized in that acetaldols are hydrogenated in the presence of a catalyst to thereby synthesize 1,3-butylene glycol; a hydrogenation crude mixture is subjected to distillation to thereby separate low-boiling-point components (L); the resultant mixture is further subjected to distillation to thereby yield 1,3-butylene glycol as a distillate; and the 1,3-butylene glycol distillate is treated with ozone. A sixth invention group is characterized in that, when acetaldols are synthesized from acetaldehyde and the acetaldols are hydrogenated in a hydrogenation step to thereby produce 1,3-butylene glycol; crotonaldehyde which is by-produced during synthesis of the acetaldols is hydrogenated together with acetaldols during the hydrogenation step, to thereby allow by-production of butanol; a butanol-containing distillate is separated from a 1,3-butylene glycol distillate through distillation; the butanol-containing distillate is subjected to distillation and a chemical treatment; and then the resultant distillate is further subjected to distillation to thereby separate low-boiling-point components and high-boiling-point components, thereby yielding butanol.
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