| abstract |
The butanol-containing solution is filtered through a nanofiltration membrane, and the butanol-containing solution obtained from step A, which recovers the butanol-containing solution from the permeate side, is passed through a reverse osmosis membrane to be concentrated, and the butanol phase and the aqueous phase ( High-purity butanol can be manufactured by the manufacturing method of butanol which includes the process B which isolate | separates two phases in a water phase), and the process C which collects butanol from the butanol phase obtained from process B. |