Highly simplified and efficient process for methanol and ammonia synthesis from coke-oven gas and pulverized coke using chemical looping technology

Abstract

The utilization of coke-oven gas (COG) to produce methanol requires external carbon supplementation and is associated with the wastage of hydrogen resources. COG chemical looping reforming (CGCLR) integrated with PC chemical looping combustion (PCCLC) is involved in this system and it is an effective solution to the poor carbon/hydrogen utilization and high process intensification. The CO2 generated from the PCCLC is recycled into the CGCLR to reformulate the methane in COG to alter the hydrogen-to-carbon ratio (R) of the syngas and thereby produce more methanol. The key operational parameters of the proposed system are analyzed to optimize the utilization of the elements in COG. This system exhibits utilization efficiencies of 85.4% and 63.9% for hydrogen and carbon, respectively, both of which are relatively high. The exergy efficiency is up to 77.5%. The new system has a reduced process complexity, and more amount of CO2 is recycled to produce value-added chemicals.