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CARBONACEOUS MESOPHASE is a liquid‐crystalline state of PITCH, which shows the optical birefringence of disklike (discotic) nematic liquid crystals. It can be formed as an intermediate phase during thermolysis (pyrolysis) of an isotropic molten PITCH or by precipitation from PITCH fractions prepared by selective extraction. Generally, the spherical mesophase precipitated from a pyrolyzing PITCH has the BROOKS AND TAYLOR STRUCTURE. With continuous heat treatment the CARBONACEOUS MESOPHASE coalesces to a state of BULK MESOPHASE before solidification to GREEN COKE with further loss of hydrogen or low‐molecular‐weight compounds.

See: BROOKS AND TAYLOR STRUCTURE IN THE CARBONACEOUS MESOPHASE, BULK MESOPHASE, GREEN COKE, PITCH.