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Titolo:
RELATIONSHIPS BETWEEN PITCH COMPOSITION AND OPTICAL TEXTURE OF COKES
Autore:
MENENDEZ R; GRANDA M; BERMEJO J;
Indirizzi:
CSIC,INST NACL CARBON,APARTADO 73 E-33080 OVIEDO SPAIN
Titolo Testata:
Carbon
fascicolo: 4, volume: 35, anno: 1997,
pagine: 555 - 562
SICI:
0008-6223(1997)35:4<555:RBPCAO>2.0.ZU;2-4
Fonte:
ISI
Lingua:
ENG
Soggetto:
COAL-TAR PITCH; AROMATIC-HYDROCARBONS; MESOPHASE FORMATION; PETROLEUM PITCHES; CARBONIZATION; EXTROGRAPHY; FRACTIONS; CHEMISTRY; PYROLYSIS; MECHANISM;
Keywords:
PITCH, MESOPHASE, COKE; PYROLYSIS; OPTICAL MICROSCOPY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
32
Recensione:
Indirizzi per estratti:
Citazione:
R. Menendez et al., "RELATIONSHIPS BETWEEN PITCH COMPOSITION AND OPTICAL TEXTURE OF COKES", Carbon, 35(4), 1997, pp. 555-562

Abstract

The optical texture of cokes obtained at 500 degrees C (60 minutes soak time) from a range of pitches, coal-tar and petroleum pitches and from the extrography fractions of three of the pitches, was related to the chemical composition of the parent material. Small differences observed in the amount of polyaromatic hydrocarbons and basic nitrogen polyaromatic compounds present in vacuum-distilled and thermally treatedbinder pitches do not have a significant influence on the optical textures of the resultant cokes. However, when pitches of very different origins (binder pitches, impregnating pitches, petroleum pitches and low-temperature tar pitches) are compared, different distributions of classes of compounds in terms of molecular size and functional groups (as determined by extrography) have a definite effect on the optical texture of the coke, a wide range of structures being observed. The carbonization of pitch fractions obtained by extrography gave valuable information on the effect of specific types of compounds on the optical texture of cokes. Fractions rich in basic PANCs provided cokes with thebest developed optical texture, whereas fractions constituted by PAHswere not completely converted into mesophase under the same pyrolysisconditions. It was also observed that pitch material not eluted during the extrographic fractionation, which is highly polar, adversely affects the development of the optical texture of the cokes. (C) 1997 Elsevier Science Ltd.

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Documento generato il 10/07/20 alle ore 11:45:00