Conventional low-pressure methanol synthesis technology is currently the most widely applied mainstream industrial process for methanol production in the fields of coal chemicals and C1 chemistry, both domestically and internationally. It overcomes the drawbacks of traditional high-pressure synthesis by employing a mature low-pressure catalytic synthesis route. Using gas mixtures containing CO, CO₂, and H₂—such as coal-derived synthesis gas, natural gas reforming gas, or coke oven gas—as primary feedstocks, the process produces crude methanol via a pressurized catalytic reaction over a copper-based catalyst, followed by rectification to yield high-quality refined methanol. Characterized by process maturity, operational stability, high safety standards, and broad adaptability, this technology serves as the standard process for domestic methanol production, accounting for over 90% of the country's production capacity.

The complete process comprises six major systems: feed gas purification, compression, low-pressure catalytic synthesis, waste heat recovery, crude methanol rectification, and tail gas treatment. It relies on standardized industrial workflows for large-scale, continuous production without requiring specialized, custom-engineered coupling structures. The technology balances cost control with environmental compliance, suits methanol production projects of various scales (large, medium, and small), and benefits from widespread adoption and comprehensive operation and maintenance systems.