Method for producing organic substance and device for producing organic substance

A method for producing an organic substance comprising:

• a step of passing a synthesis gas discharged from a gasifier through a gas cooling tower to cool the synthesis gas with water sprayed in the gas cooling tower;
• a step of passing the synthesis gas cooled in the gas cooling tower through a filtration-type dust collector, and
• a step of bringing the synthesis gas that has passed through at least the gas cooling tower and the filtration-type dust collector into contact with a microbial catalyst to generate an organic substance,
• wherein the synthesis gas contains:
• 0.1 vol % or more and 80 vol % or less of carbon monoxide,
• 0.1 vol % or more and 80 vol % or less of hydrogen, and
• 0.01 vol % or more and 5 vol % or less of oxygen, and
• wherein oxygen is removed from the synthesis gas by a deoxidation device and carbon dioxide is removed from the synthesis gas by at least one selected from the group consisting of a pressure swing adsorption type separator, a temperature swing adsorption type separator, and a pressure/temperature swing adsorption type separator.