Abstract
The mode of occurrence and optical characteristics of the carbonaceous deposits from a 3 t/d process development unit solvent-treated coal reactor were investigated by optical microscopy to increase understanding of the formation and development of reactor blockage materials such as mesophase and semicoke. The solid deposits showed a layered texture consisting of mesophase matrix as a binder, particles of non-plastic coal, pyrolytic carbon and mineral matter. The layered appearance of the deposits was due to variations in the proportions of the microscopic constituents and pores. The variations in reflectance values of the carbonaceous deposits from the centre of the reactor to the wall provided evidence of the thermal alteration after deposition. Based on these results, the formation and sedimentation of carbonaceous deposits and subsequent secondary alteration processes are discussed.
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