The synthesis of methanol from biomass-derived syngas is a complicated reaction system.The dependence of reaction heats and equilibrium constants of each reaction in the system on temperature were obtained.Biomass-derived syngas was simulated with the gas consisting of CO 21.5%

CO2 22.8%

H2 52.5%

and N2 3.2%.The equilibrium composition

carbon equilibrium conversion rate and methanol concentration were calculated at 473.15—553.15 K，3—6 MPa with the equilibrium constants methods.The computing results revealed that methanol was mainly produced from CO+H2 in the system.Lower temperature and higher pressure favored the promotion of carbon equilibrium conversion rate and methanol concentration.Commercial catalyst C306 was used to verify the calculation result.Because the reaction was controlled by thermodynamics and kinetics

at 3 MPa carbon conversion rate reached the peak at 533.15 K and was close to the carbon equilibrium conversion rate.Space time yield (STY) of methanol and concentration of methanol in the liquid product increased with increasing pressure.