Process for the preparation of methanol

Details Process for the preparation of methanol Process for the preparation of methanol

C - Chemistry, Metallurgy

07

C

260/638

C07C 29/15 (2006.01) C01B 3/38 (2006.01) C07C 29/151 (2006.01) C07C 31/04 (2006.01)

Patent

CA 1242749

ABSTRACT The invention relates to a process for the preparation of methanol by converting a lower hydrocarbon or mixture of lower hy- drocarbons to a first gas mixture containing CO and H2 and converting this first gas mixture to methanol at elevated temperature and in- creased pressure in the presence of a suitable catalyst. In order to obtain low energy requirements this process is characterized in that said lower hydrocarbon or mixture of lower hydrocarbons is con- verted in a first reactor to said first gas mixture consisting sub- stantially of CO, CO2 and H2, by partial oxidation thereof with oxygen and optionally water, at a reactor outlet temperature of bet- ween 800 and 1500°C and a pressure of between 40 and 150 bar, that said first gas mixture is supplied to a second reactor where it is converted to a second gas mixture containing methanol at a tempera- ture of between 240 and 320°C and a pressure of between 40 and 150 bar in the presence of a suitable catalyst, that a third gas mixture consisting of the non converted gaseous components is separated from said second gas mixture by cooling, that from this third gas mixture prior to recirculation to the reactor carbon dioxide is removed in an amount that the molar ratio H2/(2CO + 3CO2) in the combined said first gas mixture and the depleted third gas mixture is at least 0.90, which combined mixture is to be supplied to said second reactor, that the crude methanol, obtained by said cooling of said second gas mix- ture is expanded to a lower pressure, and purified and that the ener- gy released during said partial oxidation and the conversion of said combined gas mixture to said methanol containing third gas mixture is at least in part used for the generation of steam.

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