High-purity 1,3-butylen glycol, process for producing 1,3-butylene glycol, and process for producing by -product butanol and butyl acetate
申请人:——
公开号:US20030018224A1
公开(公告)日:2003-01-23
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.
第一项发明组以1,3-丁二醇为特征,其在生产后三个月内,按照JIS K1351 3.10测量,表现出至少五分钟的高锰酸钾褪色时间。第二项发明组的特征在于,在存在催化剂的情况下,通过乙醛醇的加氢合成1,3-丁二醇时,使用具有丙酮加氢活性为2,000 ml/g-Ni/hr或更高和/或酚加氢活性为500 ml/g-Ni/hr或更高的Raney镍作为催化剂。第三项发明组的特征在于,在碱性催化剂的存在下,通过乙醛的缩合反应获得乙醛醇,并在氢化催化剂和酸性条件下进行氢化。第四项发明组的特征在于,在碱性催化剂的存在下,通过乙醛的缩合反应获得乙醛醇,并在催化剂的存在下进行氢化,从而合成1,3-丁二醇;碱化氢化原料混合物;从碱化的原料混合物中除去醇类;并以精馏法获得和纯化1,3-丁二醇。第五项发明组的特征在于,在催化剂的存在下,通过乙醛醇的加氢合成1,3-丁二醇;将氢化原料混合物经过蒸馏分离低沸点成分(L);然后进一步蒸馏,以获得1,3-丁二醇为馏分;最后,用臭氧处理1,3-丁二醇馏分。第六项发明组的特征在于,当从乙醛合成乙醛醇,并在氢化步骤中将乙醛醇加氢以生成1,3-丁二醇时,同时加氢副产的巴豆醛和乙醛醇,以产生丁醇;通过蒸馏将含丁醇的馏分与1,3-丁二醇馏分分离;对含丁醇的馏分进行蒸馏和化学处理;然后进一步蒸馏,以分离低沸点成分和高沸点成分,从而得到丁醇。