GB928459A - Improvements in the production of phthalic anhydride - Google Patents
Improvements in the production of phthalic anhydrideInfo
- Publication number
- GB928459A GB928459A GB2685060A GB2685060A GB928459A GB 928459 A GB928459 A GB 928459A GB 2685060 A GB2685060 A GB 2685060A GB 2685060 A GB2685060 A GB 2685060A GB 928459 A GB928459 A GB 928459A
- Authority
- GB
- United Kingdom
- Prior art keywords
- solvent
- naphthaquinone
- phthalic
- anhydrides
- fed
- 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.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/42—Separation; Purification; Stabilisation; Use of additives
- C07C51/48—Separation; Purification; Stabilisation; Use of additives by liquid-liquid treatment
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/54—Preparation of carboxylic acid anhydrides
- C07C51/573—Separation; Purification; Stabilisation; Use of additives
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Naphthaquinone is removed from an aqueous solution containing phthalic acid, maleic acid and naphthaquinone by treating the mixture with a solvent for the naphthaquinone, the solvent being immiscible with water and not a solvent for the phthalic or maleic acid and separating the solvent layer containing the bulk of the naphthaquinone. Examples of solvents are benzene, toluene, xylene, benzol, toluol, xylol and the associated halogenated p compounds, esters of benzoic acid, cycloparaffins, saturated and unsaturated halogenated hydrocarbons, propyl and butyl ethers and straight chain paraffins. Trichlorethylene is a preferred solvent. The treatment may be effected by countercurrent flow, e.g. in a packed tower, the solvent being fed to the top and the mixture to be treated being fed to the bottom. The solvent may be recovered from the naphthaquinone by evaporation under vacuum. Crude mixtures of phthalic and maleic anhydrides obtained by vapour phase oxidation of hydrocarbons as in Specification 800,783 may be hydrated, treated by the above method to remove naphthaquinone, cooled to crystallise the acids, followed by centrifuging or filtration and the solid acids heated to convert them to the anhydrides. The anhydrides may be separated and purified by distillation.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2685060A GB928459A (en) | 1960-08-03 | 1960-08-03 | Improvements in the production of phthalic anhydride |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2685060A GB928459A (en) | 1960-08-03 | 1960-08-03 | Improvements in the production of phthalic anhydride |
Publications (1)
Publication Number | Publication Date |
---|---|
GB928459A true GB928459A (en) | 1963-06-12 |
Family
ID=10250239
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2685060A Expired GB928459A (en) | 1960-08-03 | 1960-08-03 | Improvements in the production of phthalic anhydride |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB928459A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4202828A (en) * | 1978-01-10 | 1980-05-13 | Kawasaki Kasei Chemicals Limited | Process for separation of naphthoquinone and phthalic acid |
US5153339A (en) * | 1979-04-25 | 1992-10-06 | Kawasaki Kasei Chemicals Ltd. | Process for separation of naphthoquinone and phthalic acid |
-
1960
- 1960-08-03 GB GB2685060A patent/GB928459A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4202828A (en) * | 1978-01-10 | 1980-05-13 | Kawasaki Kasei Chemicals Limited | Process for separation of naphthoquinone and phthalic acid |
US5153339A (en) * | 1979-04-25 | 1992-10-06 | Kawasaki Kasei Chemicals Ltd. | Process for separation of naphthoquinone and phthalic acid |
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