A Novel CO_2 Capture Process from Flue Gas with Recycling of Graphite Using Sodium-Conceptualization of the Process and Fundamental Process Description

摘要

Anthropogenic CO_2 emission is identified as the major cause of climate change. The use of fossil fuels has to be accommodated, possibly with a CO_2 capture process. Sequestration of captured CO_2 at high pressure is proposed as a feasible option for future mitigation of climate change, though using fossil fuels. However, this needs significant energy input and carries the potential threat of a possible future catastrophe. Capture of CO_2 with possible recycling is a long-term sustainable option. In this paper, a process involving a chain of reactions using solid sodium to capture both CO_2 and SO_2 from a flue gas is described. A significantly detailed description of both chemical reactions and physical processes is discussed. Recycling of captured CO_2 and SO_2 in the form of solid graphite and elemental sulphur (as the byproducts) is the special feature of this process. However, critical selection of intermediate process liquids and equipment in this process needs further study for real-life implementation of this scheme.