Study of carbonization using a tube bomb: evaluation of lump needle coke, carbonization mechanism and optimization

Isao Mochida, Takashi Oyama, Yozo Korai, You Qing Fei

Research output: Contribution to journalArticle

45 Citations (Scopus)

Abstract

The carbonization of three representative feedstocks derived from petroleum and coal tar was studied using a tube bomb, where the carbonization temperature and pressure are freely set up and carbonization progress is pursued at the desired stages. The coke lumps produced in the bomb are evaluated by optical anisotropy defined through a montage technique and coefficient of thermal expansion, which are semi-quantitatively correlated. The carbonization into needle coke follows the three major stages: the formation and growth of liquid crystal spheres; their coalescence into bulk mesophase; and the uni-axial rearrangement of mesophase molecules into a solid coke. The nature of bulk mesophase and gas evolution for the rearrangement define the quality of the needle coke. These factors are sharply influenced by the reactivity of feedstocks, carbonization temperature and pressure. Chemical analyses of the feedstocks and the carbonization intermediates describe the chemistry of the carbonization reaction, providing a structural basis for the reactivity. Based on such a mechanistic understanding of the carbonization, guiding principles to optimize the carbonization conditions of respective feedstocks into their best needle coke are proposed according to their structure and reactivity.

Original languageEnglish
Pages (from-to)1171-1181
Number of pages11
JournalFuel
Volume67
Issue number9
DOIs
Publication statusPublished - Sep 1988

Fingerprint

Carbonization
Coke
Needles
Feedstocks
Petroleum tar
Coal Tar
Optical anisotropy
Liquid Crystals
Coal tar
Coalescence
Liquid crystals
Thermal expansion
Gases
Temperature
Molecules

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Organic Chemistry

Cite this

Study of carbonization using a tube bomb : evaluation of lump needle coke, carbonization mechanism and optimization. / Mochida, Isao; Oyama, Takashi; Korai, Yozo; Fei, You Qing.

In: Fuel, Vol. 67, No. 9, 09.1988, p. 1171-1181.

Research output: Contribution to journalArticle

Mochida, Isao ; Oyama, Takashi ; Korai, Yozo ; Fei, You Qing. / Study of carbonization using a tube bomb : evaluation of lump needle coke, carbonization mechanism and optimization. In: Fuel. 1988 ; Vol. 67, No. 9. pp. 1171-1181.
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