Process for obtaining sulfur free pure naphthalene from bitumino

Details Process for obtaining sulfur free pure naphthalene from bitumino Process for obtaining sulfur free pure naphthalene from bitumino

1976-08-04

1978-07-04

Gantz, Delbert E.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

2603305, C07C 701, C07D33352

Patent

active

040988384

ABSTRACT:
In a process for obtaining substantially sulfur free pure naphthalene from bituminous coal tar and thionaphthene as a by-product, a de-phenolized thionaphthene-containing naphthalene fraction from oxidative purification is extracted with concentrated sulfuric acid and acetic acid anhydride in benzene. The thionaphthene is converted into its sulfonic acid derivative and water washed from the benzene-naphthalene mixture. The benzene is distilled leaving pure naphthalene. The sulfonic acid group is cleaved from the thionaphthene with superheated steam to yield thionaphthene.

REFERENCES:
patent: 1996262 (1935-04-01), Todd et al.
patent: 2920121 (1960-01-01), Sisco et al.
patent: 2955144 (1960-10-01), Sisco et al.
patent: 3511889 (1970-05-01), Vorozhtsov et al.

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