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Process for obtaining sulfur free pure naphthalene from bituminous coal tar and thionaphthene as a by-product

Patent ·
OSTI ID:6616233
; ; ;
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.
Assignee:
Ruetgerswerke AG
Patent Number(s):
US 4098838
OSTI ID:
6616233
Country of Publication:
United States
Language:
English

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Related Subjects

01 COAL, LIGNITE, AND PEAT
010500* -- Coal
Lignite
& Peat-- Products & By-Products
AROMATICS
BY-PRODUCTS
CHEMICAL PREPARATION
COAL TAR
CONDENSED AROMATICS
HETEROCYCLIC COMPOUNDS
HYDROCARBONS
NAPHTHALENE
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
OTHER ORGANIC COMPOUNDS
PROCESSING
SYNTHESIS
TAR
THIONAPHTHENES