Abstract
A capillary method is proposed for determining the softening point of petroleum pitch. A pitch sample is heated in a glass capillary by an air flux and observed under a microscope. The softening point is measured at the instant when the pitch within the capillary shrinks and pulls away from the glass walls. The method is tested for two series of petroleum pitch samples: one is derived from heavy pyrolytic tar; and the other from decant oil (heavy gas oil from a catalytic cracking unit with microspherical catalyst). A broad range of softening point is found for these samples by the ring-and-ball method (90–200°C). Given the simplicity of the tests and the ability to determine the softening point over a broader range (up to 330–350°C) than in the traditional method, the capillary method may be recommended for use in determining the softening point of traditional binder and also of high-melting fiber-forming pitch.
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REFERENCES
GOST (State Standard) 9950-83: Coal Tar Pitch, Methods for the Determination of Softening Point, Moscow: Izd. Standartov, 1984.
White, J.L., Gopalakrishnan, M.K., and Fathollahi, B., A processing window for injection of mesophase pitch into a fiber preform, Carbon, 1994, vol. 32, no. 2, pp. 301–310.
Korai, Y., Nakamura, M., and Mochida, I., Mesophase pitches prepared from methylnaphthalene by the aid of HF/BF3, Carbon, 1991, vol. 29, no. 4–5, pp. 561–567.
Mochida, I., Korai, Y., Ku, C.-H., Watanabe, F., and Sakai, Y., Chemistry of synthesis, structure, preparation and application of aromatic-derived mesophase pitch, Carbon, 2000, vol. 38, no. 2, pp. 305–328.
Mochida, I., Sone, Y., and Korai, Y., Preparation and properties of carbonaceous mesophase-II highly soluble mesophase from ethylene tar modified using aluminum chloride as a catalyst, Carbon, 1985, vol. 23, no. 2, pp. 175–178.
Mochida, I., Shimizu, K., and Korai, Y., Structure and carbonization properties of pitches produced catalytically from aromatic hydrocarbons with HF/BF3, Carbon, 1988, vol. 26, no. 6, pp. 843–852.
Mochida, I., Shimizu, K., and Korai, Y., Preparation of mesophase pitch from aromatic hydrocarbons by the aid of HF/BF3, Carbon, 1990, vol. 28, nos. 2–3, pp. 311–319.
Raznoushkin, A.E., Khaibullin, A.A., Zhirnov, B.S., et al., Thermolysis of petroleum pitch from different sources, Coke Chem., 2019, vol. 62, no. 1, pp. 29–33.
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Translated by B. Gilbert
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Kugatov, P.V., Raznoushkin, A.E., Zhirnov, B.S. et al. Express Method of Determining the Softening Point of Petroleum Pitch. Coke Chem. 63, 81–83 (2020). https://doi.org/10.3103/S1068364X20020040
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DOI: https://doi.org/10.3103/S1068364X20020040