| 摘要 |
The invention concerns a method for producing carbon monoxide by reverse conversion, in gas phase, of carbonic acid gas and gaseous hydrogen while minimising the production of methane. The invention is characterised in that the reaction is carried out at a temperature between 300 and 520° C. and under pressure between 10 to 40 bars in the presence of an iron-free catalyst based on zinc oxide and chromium oxide. Said method is preferably carried out continuously and comprises preferably the following steps which consist in: a) preparing a gas mixture rich in carbon dioxide and in hydrogen having a temperature between 300 and 520° C.: b) reacting said gas mixture, forming carbon monoxide and water vapour, by passing said mixture through a catalytic bed based on zinc oxide and chromium oxide maintained under pressure between 10 and 40 bars; c) cooling the gas flux derived from the catalytic bed so as to cause condensation of all or part of the water vapour formed; d) separating the condensed water from said gas fluid; e) optionally, re-treating at least once the resulting gas stream. previously brought to a temperature between 300 and 520° C., by performing steps b) to d) above, so as to increase the proportion of carbon monoxide in the gas stream, each step b) being carried out in a different catalytic bed. |
