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Kinetics of mesophase formation in a stirred tank reactor and properties of the products—II. Discontinuous reactor

✍ Scribed by Klaus J Hüttinger; Ji Ping Wang

Publisher
Elsevier Science
Year
1992
Tongue
English
Weight
806 KB
Volume
30
Category
Article
ISSN
0008-6223

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✦ Synopsis

The paper is concerned with the kinetics of mesophase formation from a petroleum and an extracted coal tar pitch during pyrolysis in a discontinuous stirred tank reactor under argon and hydrogen pressures of 1 MPa. The mesophase is a product of consecutive reactions. Its formation under all conditions could be described by the following reaction scheme:

According to this scheme, poly-aromatics {PA} are primarily formed as an intermediate product from the original pitch {A + a}, where {a} represents the volatile fraction of the pitch. Mesogenic aromatics {MA} forming mesophase {MP} are dimerisation products of the poly-aromatic molecules. The reaction scheme was derived from plots of the glass transition temperature, r,, density, p, and coke yield, CY, of the residues as a function of mesoohase content. These plots also show the influence of hydrogen on the properties of the products.

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