Method for the production of needle coke
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United States of America Patent
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-
Jun 8, 1982
Grant Date -
N/A
app pub date -
Aug 18, 1980
filing date -
Feb 22, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Coal tar pitch is liquified at temperature of from about 135.degree. C. to 280.degree. C. The liquid coal tar pitch is filtered through a sieve with apertures from about 100 to 220 .mu.m and with a closed surface area of at least 75 percent of the total sieve surface under pressures of from about 2 to 10 bar until a filter cake of a height of from about 40 to 80 mm forms above the sieve for separating ash, soot and quinoline insoluble particles from the liquid. Then the filtrate obtained is subjected to a coking process. The needle cokes resulting in accordance with the invention provide excellent materials for the production of graphite electrodes.
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