METHANOL PRODUCTION METHOD AND METHANOL PRODUCTION APPARATUS

摘要

A method for producing methanol including synthesis steps of synthesizing methanol from a synthesis gas and separation steps of separating an unreacted gas from a reaction mixture obtained by passing through the synthesis step, the method including a synthesis loop having at least two of the synthesis steps and at least two of the separation steps includes: obtaining a first mixed gas by increasing through a circulator a pressure of a residual gas, obtained by removing a purge gas from the final unreacted gas separated from the final reaction mixture in the final separation step subsequent to the final synthesis step, and by mixing the residual gas with a fraction of a make-up gas; synthesizing methanol from the first mixed gas; separating a first unreacted gas from the first reaction mixture obtained in the synthesizing step; obtaining a second mixed gas by mixing the first unreacted gas and a fraction of the make-up gas; the final synthesis step of finally synthesizing methanol; and separating the final unreacted gas from the final reaction mixture obtained in the final synthesis step, and at least in the final synthesis step, the reaction temperature of the catalyst layer is controlled by the indirect heat exchange with pressurized boiling water.