Crude methanol refinery technology purifies raw methanol, typically produced from synthesis gas, by removing impurities such as water, ethanol, higher alcohols, and trace organic compounds. The process employs a two-column or three-column distillation system, including a topping column for light ends and a refining column for high-purity methanol. Advanced configurations integrate heat recovery and vapor recompression to significantly reduce steam consumption. The refined methanol achieves AA or higher grade (≥99.85 wt%), suitable for downstream applications like formaldehyde, acetic acid, DME, and fuel blending. Efficient crude methanol refining maximizes product value while minimizing energy use and waste.