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Production of isotropic coke in industrial trials

Production of isotropic coke in industrial trials The influence of the production conditions on the properties of coke is considered. Coke is produced in a pilot plant at the Institute of Technical Chemistry, Ural Branch, Russian Academy of Sciences, in a 200-L reactor equipped with an air-supply valve and heating elements. The first stage in coke production is air-blowing of the batch with constant temperature rise at 10–12°C/h from 290–310°C; the air flow rate is 45–55 L/kg h. At this stage, the final air-blowing temperature and the batch composition are varied. The second stage is coking, with temperature rise at 25°C/h to 550–600°C. The batch consists of industrial air-blown pitch (ABP), modified by pitch tar (PT). Oxidation of the ABP, even with a very high final temperature (434°C), does not permit the production of isotropic coke. An analogous result is obtained on adding small portions of PT to the batch (15%). On adding >50% PT, totally isotropic coke may be produced. To obtain coke of isotropic microstructure, the optimal content of PT is 36–41%, and the final air-blowing temperature should be high (>390°C). The influence of PT on the structural parameters of the coke is associated with the formation of nonmesogenic structures on air-blowing. On coking, these structures suppress the growth of large mesophase. The isotropic coke produced has the following characteristics: limited expansion in the range 1300–2400°C; high structural strength; and optimal density. Graphite based on such coke is considerably superior to graphite based on industrial pitch coke in terms of its compressive strength, density, and electrical resistivity. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Coke and Chemistry Springer Journals

Production of isotropic coke in industrial trials

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References (10)

Publisher
Springer Journals
Copyright
Copyright © 2014 by Allerton Press, Inc.
Subject
Chemistry; Industrial Chemistry/Chemical Engineering
ISSN
1068-364X
eISSN
1934-8398
DOI
10.3103/S1068364X1405007X
Publisher site
See Article on Publisher Site

Abstract

The influence of the production conditions on the properties of coke is considered. Coke is produced in a pilot plant at the Institute of Technical Chemistry, Ural Branch, Russian Academy of Sciences, in a 200-L reactor equipped with an air-supply valve and heating elements. The first stage in coke production is air-blowing of the batch with constant temperature rise at 10–12°C/h from 290–310°C; the air flow rate is 45–55 L/kg h. At this stage, the final air-blowing temperature and the batch composition are varied. The second stage is coking, with temperature rise at 25°C/h to 550–600°C. The batch consists of industrial air-blown pitch (ABP), modified by pitch tar (PT). Oxidation of the ABP, even with a very high final temperature (434°C), does not permit the production of isotropic coke. An analogous result is obtained on adding small portions of PT to the batch (15%). On adding >50% PT, totally isotropic coke may be produced. To obtain coke of isotropic microstructure, the optimal content of PT is 36–41%, and the final air-blowing temperature should be high (>390°C). The influence of PT on the structural parameters of the coke is associated with the formation of nonmesogenic structures on air-blowing. On coking, these structures suppress the growth of large mesophase. The isotropic coke produced has the following characteristics: limited expansion in the range 1300–2400°C; high structural strength; and optimal density. Graphite based on such coke is considerably superior to graphite based on industrial pitch coke in terms of its compressive strength, density, and electrical resistivity.

Journal

Coke and Chemistry – Springer Journals

Published: Aug 23, 2014

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