| 摘要 |
<p>Case 4571 Acetaldehyde is produced by reacting methanol with hydrogen and carbon monoxide at elevated temperature and pressure in the presence of a catalyst comprising cobalt, an iodide or a bromide and one of the elements arsenic, antimony or bismuth, either in the form of the free element or a compound thereof, and in the additional presence of one or more of the following additives: (i) an inert liquid such as chlorobenzene, decanoic acid, a polydimethylsiloxane fluid or a methyl phenyl silicone fluid,(ii) an acid and/or an acid derivative such as acetic acid, acetic anhydride, propionic acid, phenylacetic acid, benzoic acid, methyl acetate or butyl acetate.(iii) an oxygen-containing organic compound such as 1,4dioxane, tetrahydrofuran, di-n-propylether, diphenylether, acetone, acetaldehyde, n-propanol or n-butanol.(iv) a non-polar solvent such as an alkane, benzene or an alkyl-substituted benzene. The presence of the additive suppresses by-product formation and thereby improves the yield and selectivity to acetaldehyde.</p> |
