Organic compounds -- part of the class 532-570 series – Organic compounds – Oxygen containing
Patent
1979-07-05
1981-01-27
Lone, Werren B.
Organic compounds -- part of the class 532-570 series
Organic compounds
Oxygen containing
568788, C07C 3768, C07C 3714
Patent
active
042477190
ABSTRACT:
The relative amount of 2,5-xylenol in a 2,4-/2,5-xylenol mixture is significantly increased by passage of the xylenol mixture together with a suitable tertiary-alkylating agent through a reactor packed with a polymer-bound sulfonic acid catalyst at temperatures of 65.degree.-95.degree. C. and, preferably, 80.degree.-90.degree. C. The product stream from such a reactor under these conditions based on a 50:50 mixture of the two isomers contains a much greater amount of 6-t-alkyl-2,4-xylenol (t-alkylated 2,4-xylenol) than 4-t-alkyl-2,5-xylenol (t-alkylated 2,5-xylenol); consequently the resulting unalkylated 2,4-/2,5-xylenol mixture is greatly enriched in 2,5-xylenol. Recovery of the unalkylated mixture by fractionation thus affords a crude 2,5-xylenol which can be further purified to give pure 2,5-xylenol.
REFERENCES:
patent: 2435087 (1948-01-01), Luten et al.
patent: 2497971 (1950-02-01), Basterfield
patent: 2586070 (1952-02-01), Luten et al.
patent: 2802884 (1957-08-01), D'Alelio
patent: 2917487 (1959-12-01), Jones et al.
Stevens, "Industrial & Eng. Chem.," vol. 35, No. 6, pp. 655-660.
Buck William R.
Dodd John R.
Conoco Inc.
Lone Werren B.
Schupbach, Jr. Cortlan R.
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