公开(公告)号：US6121498A

公开(公告)日：2000-09-19

申请号：US69953

申请日：1998-04-30

申请人： Gerald C. Tustin ,  Leslie S. Depew ,  Nick A. Collins

发明人： Gerald C. Tustin ,  Leslie S. Depew ,  Nick A. Collins

IPC分类号： B01J23/89 ,  C07B61/00 ,  C07C45/41 ,  C07C45/84 ,  C07C47/06 ,  C07C47/00 ,  B01J23/00 ,  B01J23/42 ,  C07C45/00

CPC分类号： B01J23/8906 ,  C07C45/41 ,  Y02P20/582

摘要： A method of producing acetaldehyde hydrogenates acetic acid in the presence of an iron oxide catalyst containing between 2.5 and 90 wt % Pd, more preferably 10 and 80 wt % Pd and most preferably 20 and 60 wt % Pd. The catalyst has a specific surface area of less than 150 m.sup.2 /g. Hydrogen and acetic acid are fed to a reactor in a hydrogen to acetic acid ratio of 2:1 to 25:1, more preferably in a hydrogen to acetic acid ratio of 3:1 to 15:1 and most preferably in a hydrogen to acetic acid ratio of 4:1 to 12:1. The hydrogenation is performed at a temperature of about 250.degree. C. to 400.degree. C., more preferably about 270.degree. C. to 350.degree. C. and most preferably about 280.degree. C. to 325.degree. C. The hydrogenation of acetic acid produces a partially gaseous product, and acetaldehyde is absorbed from the partially gaseous product with a solvent containing acetic acid. The gas remaining after the absorption step contains hydrogen, and this gas is recycled for the hydrogenation of acetic acid. The absorbed acetaldehyde is distilled to isolate same. After acetaldehyde is isolated from unreacted acetic acid and the other products via distillation, the unreacted acetic acid is separated from the other products using azeotropic distillation. Water is contained in the other products, and the azeotrope is an azeotrope of ethyl acetate and water. The unreacted acetic acid is separated in a column, and the column is controlled to contain an ethyl acetate rich azeotrope of ethyl acetate and water.

摘要翻译： 在含有2.5-90wt％Pd，更优选10和80wt％Pd，最优选20-60wt％Pd的氧化铁催化剂存在下，乙醛的制备方法使乙酸氢化。 催化剂的比表面积小于150m2 / g。 将氢和乙酸以2:1至25:1的氢气与乙酸的比例加入到反应器中，更优选以3:1至15:1的氢气至乙酸比例加入，最优选在氢气至乙酸 酸比为4：1至12：1。 氢化在约250℃至400℃，更优选约270℃至350℃，最优选约280℃至325℃的温度下进行。乙酸的氢化产生 部分气态产物，并且乙醛由含有乙酸的溶剂从部分气态产物中吸收。 吸收步骤后残留的气体含有氢气，该气体被再循环用于乙酸的氢化。 将吸收的乙醛蒸馏除去。 通过蒸馏从未反应的乙酸和其它产物中分离乙醛后，使用共沸蒸馏将未反应的乙酸与其它产物分离。 其他产物中含有水，共沸物是乙酸乙酯和水的共沸物。 将未反应的乙酸在柱中分离，并将柱控制为含有乙酸乙酯和水的乙酸乙酯富共沸物。