Solvent swelling of Dictyonema oil shale: Low temperature heat-treatment caused changes in swelling extent

摘要

Equilibrium swelling experiments were used to gain insight into the structural changes of Dictyonema oil shale kerogen (baltoscandian basin black shale kerogen) during low-temperature heating. Room temperature volumetric swelling was measured for samples previously thermally pre-treated at different temperatures under an inert gas environment. The swelling capacity for heat-treated Dictyonema oil shale decreases with increasing pre-treatment temperature from about 150 ℃ to 380 ℃, suggesting that cross-linking reactions occur during low-temperature heat treatment in the pre-pyrolysis temperature region. This behavior is consistent with that observed in non-softening low-tar yield coals.