Abstract
The carbonization of coal-tar pitches and their QI (quinoline insoluble)-free fractions was studied by evaluating their lump cokes produced in a tube bomb at various temperatures (470 to 550° C) and pressures (0 to 75 kg cm−2 gauge). The lump coke from QI-free fractions had a comparable anisotropic development and coefficient of thermal expansion (CTE). The carbonization temperature and pressure were found to influence strongly the properties of the cokes. At the highest temperature of 550° C, the most appropriate pressure for the best needle coke was 15 kg cm−2 G (gauge). Either higher or lower pressure increased the CTE value of coke. In contrast, at a moderate temperature of 500° C, the higher pressure produced the better coke. At the lowest temperature of 470° C, it took 10 h to complete the carbonization, and the lowest pressure allowed the best extent of uniaxial arrangement. Among the cokes prepared under the present conditions, the Carbonization at 500° C under 40 kg cm−2 G produced the best needle coke with a CTE value as low as 0.1 × 10−6° C−1. The carbonization scheme leading into the needle coke is discussed for a better understanding of how the carbonization temperature and pressure cooperatively influence the quality of the resultant coke, in relation to the carbonization reactivity of coal-tar pitch.
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References
I. Yoshida andS. Mukai,Kagaku Kogyo 34 (1981) 36.
Japanese patents 52-28501 (1977); 55-014387 (1980); 55-113606 (1980).
M. Kakuta, in “An Introduction to Carbon” (Carbon Society of Japan, 1984) p. 116.
S. Kiyono,ibid. p. 138.
I. Mochida andH. Marsh,TANSO 126 (1986) 89.
I. Letizia andM. H. Wagner, Extended Abstracts 16th Biennial Conference on Carbon, American Carbon Society, 1983, p. 593.
I. Mochida, Y. Korai, Y. Nesumi andT. Oyama,Ind. Eng. Chem. Prod. Res. Dev. 2 (1986) 189.
I. Mochida, M. Ogawa andK. Takeshita,Bull. Chem. Soc. Jpn 49 (1976) 514.
I. Mochida, T. Oyama andY. Korai,Carbon 25 (1987) 273.
J. L. White andJ. Zimmer, in Extended Abstracts and Program of the 13th Biennial Conference on Carbon (American Carbon Society, 1977) p. 318.
I. Mochida, T. Oyama, Y. Nesumi, Y. Korai andH. Fujitsu,Carbon 25 (1987) 259.
E. Fitzer andB. Terweish,Carbon 11 (1973) 570.
H. Honda, H. Kimura, Y. Sanada, S. Sugawara andT. Furuda,Carbon 8 (1970) 181.
H. Marsh, F. Dachille, M. Lley, P. L. Walker Jr andP. W. Whang,Fuel 52 (1973) 253.
H. Matsumura, Preprint for Nishiyama Lecture, edited by The Iron and Steel Institute of Japan, (1986).
I. Mochida, T. Oyama andY. Korai,Carbon in press.
I. Mochida andK. Takeshita,Kagaku Kogyo 26 (1975) 918.
J. D. Brooks andG. H. Taylor, in “Chemistry and Physics of Carbon”, Vol. 4, edited by P. L. Walker Jr. and P. A. Thrower (Marcel Dekker, New York, 1968) p. 243.
D. S. Hoover, A. Davis, A. J. Perrota andW. Spackman, Extended Abstracts 14th Biennial Conference on Carbon, American Carbon Society, 1979, p. 393.
M. Forrest andH. Marsh, in “Coal and Coal Products: Analytical Characterization Techniques” (ACS Symposium Series No. 205) edited by E. L. Fuller Jr. (American Chemical Society, 1982) p. 1.
I. Mochida, K. Maeda andK. Takeshita,Carbon 15 (1977) 17.
J. L. White, in “Petroleum Derived Carbons” (ACS Symposium Series No. 21) edited by M. L. Deviney and T. M. O'Grady (American Chemical Society, 1976) p. 287.
I. Mochida, M. Z. Wang andY. Korai,J. Fuel Soc. Jpn 63 (1984) 41.
K. J. Huttinger andU. Rosenblatt,Carbon 15 (1977) 69.
E. Aristoff, R. W. Rieve andH. Shalit, Chemistry of Coal Utilization, edited by M. A. Elliott (1981) p. 997.
H. Marsh, G. M. Kimber, T. Rantell andE. Scott,Fuel 59 (1980) 520.
J. Gibson, in Coal and Modern Coal Processing: An Introduction” edited by G. J. Pitt and G. R. Millward (1977) p. 52.
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Mochida, S., Qing Fei, Y., Oyama, T. et al. Carbonization of coal-tar pitch into lump needle coke in a tube bomb. J Mater Sci 22, 3989–3994 (1987). https://doi.org/10.1007/BF01133349
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DOI: https://doi.org/10.1007/BF01133349