JPS5498734A - Method of separation of naphthoquinone and phthalic acid - Google Patents
Method of separation of naphthoquinone and phthalic acidInfo
- Publication number
- JPS5498734A JPS5498734A JP275178A JP275178A JPS5498734A JP S5498734 A JPS5498734 A JP S5498734A JP 275178 A JP275178 A JP 275178A JP 275178 A JP275178 A JP 275178A JP S5498734 A JPS5498734 A JP S5498734A
- Authority
- JP
- Japan
- Prior art keywords
- naphthoquinone
- slurry
- phthalic acid
- acid
- products
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
PURPOSE: Acidic impurities in an aqueous slurry of naphthoquinone and phthalic acid that results from the catatlytic oxidation of naphthalene in vapor phase are neutralized, then the slurry is heated to dissolve the phthalic acid and the naphthoquinone is separated by extraction, thereby separating them into each component.
CONSTITUTION: A gas containing the reaction products from the catalytic oxidation of naphtalene in gas phase is brought into contact with an aqueous medium to catch the products as a slurry. Then the acid components in the slurry as sulfuric acid and maleic acid are neutralized with sodium hydroxide and the slurry is heated to dissolve the phthalic acid and the remaining naphthoquinone is extracted with a water- insoluble solvent. The aqueous layer is cooled to precipitate and separate the phthalic aicd. The aqueous medium can be recylcled for capturing the gaseous oxidation products.
EFFECT: The amount of the base for neutralizing the reaction product can be reduced and the decomposition and deterioration of the naphthoquinone can be prevented.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP53002751A JPS591250B2 (en) | 1978-01-17 | 1978-01-17 | Separation method of naphthoquinone and phthalic acid |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP53002751A JPS591250B2 (en) | 1978-01-17 | 1978-01-17 | Separation method of naphthoquinone and phthalic acid |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5498734A true JPS5498734A (en) | 1979-08-03 |
JPS591250B2 JPS591250B2 (en) | 1984-01-11 |
Family
ID=11538043
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP53002751A Expired JPS591250B2 (en) | 1978-01-17 | 1978-01-17 | Separation method of naphthoquinone and phthalic acid |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS591250B2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5511520A (en) * | 1978-07-11 | 1980-01-26 | Kawasaki Kasei Chem Ltd | Separation of naphthoquinone from phthalic acid |
US5153339A (en) * | 1979-04-25 | 1992-10-06 | Kawasaki Kasei Chemicals Ltd. | Process for separation of naphthoquinone and phthalic acid |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6258903U (en) * | 1985-10-01 | 1987-04-11 |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS539209A (en) * | 1976-07-13 | 1978-01-27 | Toshiba Corp | High frequency heating coil of floating zone purifying apparatus |
-
1978
- 1978-01-17 JP JP53002751A patent/JPS591250B2/en not_active Expired
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS539209A (en) * | 1976-07-13 | 1978-01-27 | Toshiba Corp | High frequency heating coil of floating zone purifying apparatus |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5511520A (en) * | 1978-07-11 | 1980-01-26 | Kawasaki Kasei Chem Ltd | Separation of naphthoquinone from phthalic acid |
JPS591251B2 (en) * | 1978-07-11 | 1984-01-11 | 川崎化成工業株式会社 | How to separate naphthoquinone and phthalic acid |
US5153339A (en) * | 1979-04-25 | 1992-10-06 | Kawasaki Kasei Chemicals Ltd. | Process for separation of naphthoquinone and phthalic acid |
Also Published As
Publication number | Publication date |
---|---|
JPS591250B2 (en) | 1984-01-11 |
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