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- W142715422 abstract "One, two, or three anthracene fractions may be produced, depending on the coal tar processing flowsheet adopted. The second and third fractions are used without further processing to make road tar or produce technical carbon. The first or general anthracene fraction is crystallized and centrifuged to recover crude anthracene, which is mainly used in the production of 40% and pure anthracene, along with some other technical uses. The crystallization technique has been widely adopted because of its simplicity and low cost. The crystallization of anthracene fraction or oil, like that of any other solution or melt, can be subdivided into three stages, viz., an induction period during which the concentration of product in solution remains almost constant, then a crystallization period during which rapid crystal formation lowers the solution concentration at a high rate, and finally a stabilization period during which the solution concentration changes slowly as a result of the formation and recrystallization of the smallest crystals. We have attempted to clarify the effects of three variables on the crude anthracene yield and composition, viz., the final fraction cooling temperature, the cooling rate and the holding period at the final temperature. The optimum conditions are an end-of-crystallization temperature ofmore » 45 to 55/sup 0/C, a cooling less than or equal to 2 K/min and a suspension holding period of 30 min.« less" @default.
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- W142715422 date "1979-01-01" @default.
- W142715422 modified "2023-09-27" @default.
- W142715422 title "Crystallization of anthracene fraction" @default.
- W142715422 hasPublicationYear "1979" @default.
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