Structure and thermal stabilities of coal liquid vacuum residues produced from an Australian brown coal.

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The thermal stabilities of two coal liquid vacuum residues produced from Morwell brown coal under the conditions of 430°C-20min and-60min (abbreviated as CLVR-M1 and-M2, respectively) were studied to compare their structure and composition. CLVR-M1 lost its HI-BS and BI-THFS fractions from 65 to 40%, gaining more THFI fraction (15→38%) by the heattreatment at 300°C for 10h under nitrogen flow. In contrast, CLVR-M2 gained both of HS and THFI fractions from 11 to 17% and from 11 to 21%, respectively, by the same treatment. The heattreatment under pressure of nitrogen at 300°C or with tetrahydrofluoranthene (4HFL) at 450°C increased the HS fraction of both CLVRs with decreas-ing their THFI fraction, although the extent of depolymerization was larger for CLVR-M2 than that for CLVR-M1.<BR>Such thermal stabilities reflect their structure. CLVR-M1 contained more amounts of heavier fractions than CLVR-M2. The lighter fractions (HS and HI-BS) of the former residue carried more alkyl groups to initiate radical reactions and less naphthenic rings for the hydrogen donation. The BI-THFS fraction of CLVR-M1 carried more oxygen-containing groups.<BR>Such structural characteristic may be reasons of its higher polycondensation-reactivity and more difficulty for the hydrogen transferring depolymerization.
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