Effects of metal-ion removal on the solubility of coal liquid vacuum residue.

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The acid pretreatment to remove ash minerals in ionic forms from coal liquid vacuum residues was examined under reflux conditions with 10% MeOH/1N HCl solution. The acid treatment improved the solubilities of the asphaltene and preasphaltene fractions in the residues, increasing the oil and asphaltene fractions, respectively, although the difference between the two residues (produced at shorter and longer reaction times) was not so significant, indicating that metal ions, which remain in the asphaltene and preasphaltene, may be hardly removed at the primary liquefacti4on stage, even though physical deashing methods such as gravity and floatation separations are applied. The acid-treated fractions were depolymerized to smaller molecules by releasing oxygen-containing groups through the removal of metal ions such as Ca2+, Mg2+ and Fe2+ which bridge the macromolecule chains through the oxygen-containing groups.
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