Abstract
Heavy direct coal liquefaction products are known to exhibit rapidly increasing viscosities upon prolonged exposure to oxygen. Small-angle X-ray scattering has been used to monitor changes in the colloidal structure of a coal liquid subjected to accelerated aging under an oxygen atmosphere for a total period of 54 days. The data are consistent with an agglomeration model for the formation of large colloidal-size scattering centres which are partially responsible for the rapidly increasing viscosity of the coal liquid.
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