Production of Methane from Hydrate and CO2 Zero-Emission Concept

EasyChair Preprint 1546

Abstract

We have evaluated enthalpies of formation, or dissociation, for hydrates of CO2 and CH4. The exothermic heat released when a CO2 hydrate is formed could be 9 - 10 kJ/mol of guest molecule more than the heat required to dissociate a CH4 hydrate to methane gas and liquid water. The implication is that the heat released is available for dissociating the surrounding CH4 hydrate to CH4 gas and liquid water. In addition to the free pore water additional free water will become available for new CO2 hydrate to form in place of the original CH4 hydrate. The released CH4 will migrate upwards due to buoyancy. The pressure–temperature projection is not what is essential to replace in situ methane hydrate with carbon dioxide. The difference in free energy of the two hydrates (CO2 and CH4 hydrates) and the heat of crystallization of CO2 hydrate relative to the heat of dissociation (or formation) of the CH4 hydrate is what is vital. This is based on the combined first and second laws of thermodynamics. Carbon dioxide hydrate is thermodynamically more stable than methane hydrate in respect of free energy. The free energy of CO2 hydrate may be 1.8 - 2.0 kJ/mol lower than that of CH4 hydrate.

Keyphrases: CCS, CO2, Chemical potential, Energy, Natural gas hydrate, carbon dioxide, ch4 hydrate formation, gas hydrate, hydrate, hydrate formation, hydrate formation enthalpy, methane, methane hydrate, residual thermodynamic

@booklet{EasyChair:1546,
  author    = {Solomon Aforkoghene Aromada and Bjørn Kvamme},
  title     = {Production of Methane from Hydrate and CO2 Zero-Emission Concept},
  howpublished = {EasyChair Preprint 1546},
  year      = {EasyChair, 2019}}