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

Patent · Tue Jul 04 00:00:00 EDT 1978

OSTI ID:6616233

Grigoleit, G; Koehler, H; Collin, G; Matern, K

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
• Resource Relation: Patent Priority Date: Priority date 7 Aug 1975, German, Federal Republic of (F.R. Germany)
• Country of Publication: United States
• Language: English

Related Subjects

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