Combined syntheses and co-production

Similar considerations can be made for an integrated synthesis for DME production [170] and for integrated synthesis of acetic acid [406]. The cost savings in the s5mthesis loops should be compared with increased costs for separation of the products in a diluted product gas. 

Methanol can be produced as co-product in the ammonia synthesis [239] [406]. The CO and CO2 for the methanol synthesis is obtained by a partial bypass of the shift converters and the CO2 wash. The methanol synthesis takes place in an adiabatic reactor or a simple once-through boiling water reactor and the unconverted S5mgas is passed through a methanator back to the ammonia synthesis loop. 

The combined methanol/dimethylether synthesis pushes the equilibrium to higher once-through conversion as illustrated in Table 2.15. 

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