Attainable regions for a reactor: Application of ΔH-ΔG plot

► Chemical species create lines that define attainable boundaries in a GH plot, hence the interactions between competing reactions in a reactor can be analyzed. ► Provides useful information for evaluating an operating process, allowing for a greater insight. ► The result of changing process feed and operating parameters can be easily and rapidly interpreted. ► Most favorable conditions were obtained at lower temperatures and at higher pressures. ► Water and/or CO2 as feed result in more reaction path alternatives for methanol synthesis.