Organic compounds -- part of the class 532-570 series – Organic compounds – Oxygen containing
Patent
1992-03-23
1992-12-15
Lone, Werren B.
Organic compounds -- part of the class 532-570 series
Organic compounds
Oxygen containing
568750, 568761, 568805, C07C 3768, C07C 3750
Patent
active
051718952
ABSTRACT:
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.degree. C. to 400.degree. C. and at vapor flow rates measured as liquid hourly space velocity (LHSV), of about 1 hr..sup.-1 to demethylate the guaiacol.
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Lawson, J. and M. Klein, "Influence of Water on Guaiacol Pyrolysis", Ind Eng. Chem. Fundam., 24:203 (1985).
Ceylan, R. and J. Bredenberg, "Hydrogenolysis and Hydrocracking of the Carbon-Oxygen Bond 2 Thermal Cleavage of the Carbon-Oxygen Bond in Guaiacol" Fuel 61:377 (1982).
Vuori, A. and J. Bredenberg, "Hydrogenolysis and Hydrocracking of the Carbon-Oxygen Bond. 4. Thermal and Catalytic Hydrogenolysis of 4-Propylguaiacol" Holzforschung, 38:133 (1984).
Lone Werren B.
Merichem Company
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