An equation-oriented approach was developed for steady state flowsheeting of a commercial methanol plant. The loop consists of fixed bed reactor, flash separator, preheater, coolers, and compressor. For steady sate flowsheeting of the plant mathematical model of reactor and other units are needed. Reactor used in loop is a Lurgi type and its configuration is rather complex. Previously reactor and flash separator are modeled as two important units of plant. The model is based on mass and energy balances in each equipment and utilizing some auxiliary equations such as rate of reaction and thermodynamics model for activity coefficients of liquid. By integral simulation of the methanol production loop forty-four nonlinear and linear equations have been generated and solved for unknowns by Newton\\\\\\\'s multi dimensional global convergence method.In order to validate the mathematical model for the synthesis loop, some simulations data were performed using operating conditions and characteristics of the commercial plant. The good agreement between the model results and the plant data shows the validity of the it.

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