Bio-ethanol: energy-integrated distillation + MVR stillage concentration

A dilute beer (10% ethanol) is concentrated toward the azeotrope in a beer column, and the water-rich stillage bottoms are concentrated in an evaporator whose vapor is recompressed by a mechanical-vapor-recompression (MVR) compressor — recovering the stillage vapor's latent heat as high-grade heating duty instead of venting it, the energy-integration route that eliminates a separate thermal oxidizer. Honesty note: the MVR train is modeled at screening fidelity (an evaporator + a real isentropic-efficiency recompression of its vapor, reporting the recompression work); the solids in real stillage are not tracked (the bottoms is modeled as the ethanol/water liquid), and this is an equipment-train energy study, not a rigorous three-phase superheated-steam dryer.