| 摘要 |
<p>In a catalytic MeOH synthesis where a fluid hydrocarbon is steam reformed to give a high temp. synthesis gas stream (g.s.), this g.s. is cooled in a steam boiler to an intermediate temp. by a first heat exchange (h.e.) with water, and then cooled further to condense the water. The resulting g.s. is compressed and combined with a recycle g.s. to form a synthesis feed g.s. This is heated by a third h.e., passed to a catalytic MeOH-synthesis at elevated temp., and press. cooled by the third h.e. and further cooled by a fourth h.e. to condense the MeOH. The crude MeOH is separated at elevated press. The residual gas is divided into a purge g.s. and the recycle g.s. The MeOH is distilled under reduced press. in distillation columns fitted with lower reboilers. These reboilers are heated by cooling the intermediate temp. g.s. by passing through at least one, passing a liquid through the fourth h.e. which is heated and passed through a second reboiler, and recycling the cooled liquid.</p> |
