Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
PREPARATION OF NAPHTHOQUINONE
Document Type and Number:
Japanese Patent JPS59172434
Kind Code:
A
Abstract:

PURPOSE: To obtain high-purity naphthoquinone, by washing a formed gas of gaseous phase catalytic oxidation reaction of naphthalene and collecting it to give an aqueous slurry containing naphthoquinone and phthalic acid, separating both by the use of difference of water solubility.

CONSTITUTION: A reaction mixture gas containing naphthoquinone and phthalic anhydride obtained by catalytic gaseous phase oxidation of naphthalene is brought into contact with an aqueous medium containing maleic acid, 10W 10,000ppm iron ion and 10W10,000ppm copper ion to give a slurry containing naphthoquinone and phthalic acid, from which wet cake containing the two compounds is filtered, washed fully with water. A sufficient amount of water is added to it, phthalic acid is dissolved in water at 60W85°C under heating, and naphthoquinone is filtered and separated.

EFFECT: Polymerization of naphoquinone will not take place. Only water is used as a collecting solvent so there is no danger. Filtrate prepared by separation of phthalic acid from a phthalic acid solution can be recycled for water washing and collection and an amount of waste water is reduced.


Inventors:
KITA HIROICHI
SAKAMOTO KENTAROU
SATOU TAKAHISA
Application Number:
JP4706883A
Publication Date:
September 29, 1984
Filing Date:
March 23, 1983
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
NIPPON CATALYTIC CHEM IND
International Classes:
C07C50/12; C07C45/00; C07C46/04; C07C46/10; C07C67/00; (IPC1-7): C07C46/04; C07C50/12



 
Previous Patent: JPS59172433

Next Patent: PREPARATION OF ACETIC ANHYDRIDE