Mechanism of dewatering porous structures with supercritical carbon dioxide. (December 2021)

• Record Type: Journal Article
• Authors: Asafu-Adjaye, Osei; Via, Brian; Sastri, Bhima; Banerjee, Sujit
• Is Part Of: Case studies in chemical and environmental engineering. Volume 4 (2021)
• Publication Date: 2021-12
• Subjects: Viscous fingering coal porous supercritical co2; Chemical engineering -- Periodicals; Environmental engineering -- Periodicals; Environmental chemistry -- Periodicals; 628.05
• DOI: 10.1016/j.cscee.2021.100128
• Languages: English
• ISSNs: 2666-0164

Abstract

Abstract: Wet porous structures such as coal, paper, wood and sludge are dewatered by supercritical carbon dioxide (sCO2 ) by a combination of two processes. The free water is physically displaced by the CO2 whereas the bound water is solubilized by it. The degree of displacement is exclusively dictated by the viscosity of sCO2, which is strongly dependent on temperature. Displacement is the most efficient means of dewatering possible, and the relatively mild temperatures used in this application should lead to favorable industrial economics.