| 摘要 |
Purification of cresylic acid by guaiacol removal from lignite-based feed as well as other naturally occurring sources of cresylic acid is accomplished by catalytic demethylation in the presence of an alumina catalyst. In the process of this invention, de-pitched, dephenolated creyslic acid is vaporized and passed over a high surface area, alumina catalyst at temperature ranges of between 350 DEG C. to 400 DEG C. and at vapor flow rates measured as liquid hourly space velocity (LHSV), of about 1 hr.-1 to demethylate the guaiacol.
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