| 摘要 |
1306863 Acetic acid AJINOMOTO CO Inc 31 July 1970 [14 Aug 1969] 37227/70 Heading C2C A process for the production of acetic acid comprises the following steps (a) reacting a gaseous mixture of carbon monoxide and hydrogen in a molar ratio of 1 to not less than 0À5, with methanol in the gas phase in the presence of a transition metal catalyst and a halogencontaining compound co-catalyst until no more than half of the carbon monoxide is consumed; (b) cooling the reacted gas obtained in step (a), separating the cooled gas into a liquid component containing acetic acid and a gaseous component containing unreacted carbon monoxide and hydrogen and withdrawing the acetic acid from the reaction system, (c) washing the gaseous component from step (b) with cold methanol and (d) reacting the washed gaseous component from step (c) in the presence of a coppercontaining catalyst to yield methanol and passing this methanol to step (a). Preferred processes are described referring to Figs. 1-3 (not shown). In an example the catalysts employed are metallic rhodium supported on active charcoal and metallic copper, zinc and chromium in admixture supported on graphite. The starting material gaseous mixture may be produced by the partial oxidation of coke, petroleum or natural gas or by reforming hydrocarbons in the presence of carbon dioxide and steam. |
