| 摘要 |
The present invention enables the coproduction of methanol and ammonia by using a remarkably smaller amount of raw material, natural gas, as compared with the case of independently producing either of methanol or ammonia. Specifically, the present invention provides a process of coproducing methanol and ammonia by using natural gas, LPG, butane, or naphtha as raw material, having a methanol production process (A) composed of specific steps and an ammonia production process (B) also composed of specific steps, in which (1) directing a gas rich in hydrogen recovered in a hydrogen recoverying step in the methanol production process (A) to a certain step after an air reforming step and before a ammonia synthesis step in the ammonia production process (B) to prepare additional feedstock gas for ammonia synthesis; and also (2) cooling a synthesis gas, formed in a steam reforming step in the methanol production process (A) and separating and removing condensed water from the cooled synthesis gas, mixing the water removed synthesis gas and and carbon dioxide obtained by pre-compressing carbon dioxide obtained in a CO 2 removing step in the ammonia production process (B), compressing up to the methanol synthesis pressure to be supplied as reactant gas for methanol synthesis to the methanol synthesis step (A-2). |
