GB774920A - Improvements in the production of pure benzene carboxylic acids - Google Patents
Improvements in the production of pure benzene carboxylic acidsInfo
- Publication number
- GB774920A GB774920A GB3176654A GB3176654A GB774920A GB 774920 A GB774920 A GB 774920A GB 3176654 A GB3176654 A GB 3176654A GB 3176654 A GB3176654 A GB 3176654A GB 774920 A GB774920 A GB 774920A
- Authority
- GB
- United Kingdom
- Prior art keywords
- carboxylic acids
- oxygen
- nitric acid
- hypochlorite
- oxidation
- 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
- C07C51/487—Separation; Purification; Stabilisation; Use of additives by treatment giving rise to chemical modification
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Benzene carboxylic acids are prepared by subjecting the mixtures obtained by first treating the corresponding alkyl benzenes at elevated temperature with oxygen or oxygen-containing gases, if desired in the presence of oxygen transferrers, until no further oxygen is absorbed and then treating with nitric acid at elevated temperatures and if desired under increased pressure, to a treatment in an aqueous alkaline medium with a hypochlorite. Alkyl benzenes specified are toluene, xylene, ethylbenzene, diethylbenzene, di-isopropylbenzene and cymene. After the nitric acid oxidation, the nitric acid is separated and the mixture containing carboxylic acids is dissolved or suspended in 1 to 10 per cent aqueous alkaline liquor and heated to 40-85 DEG C. with the calculated amount of hypochlorite. The reaction mixture is acidified to recover the carboxylic acid. The hypochlorite treatment may also be conducted by leading chlorine into the alkaline solution or suspension of the mixture containing carboxylic acids at 50 DEG to 80 DEG C. In an example, crude terephthalic obtained by the catalytic oxidation of p-di-isopropylbenzene with air in the presence of cobalt naphthenate followed by oxidation with nitric acid, is dissolved in aqueous caustic soda, treated with bleaching powder liquor and heated to reaction temperature, the solution then being acidified at boiling point to yield terephthalic acid.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3176654A GB774920A (en) | 1954-11-03 | 1954-11-03 | Improvements in the production of pure benzene carboxylic acids |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3176654A GB774920A (en) | 1954-11-03 | 1954-11-03 | Improvements in the production of pure benzene carboxylic acids |
Publications (1)
Publication Number | Publication Date |
---|---|
GB774920A true GB774920A (en) | 1957-05-15 |
Family
ID=10328083
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3176654A Expired GB774920A (en) | 1954-11-03 | 1954-11-03 | Improvements in the production of pure benzene carboxylic acids |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB774920A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1199755B (en) * | 1960-12-23 | 1965-09-02 | California Research Corp | Process for the purification of aromatic carboxylic acids |
-
1954
- 1954-11-03 GB GB3176654A patent/GB774920A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1199755B (en) * | 1960-12-23 | 1965-09-02 | California Research Corp | Process for the purification of aromatic carboxylic acids |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US2461740A (en) | Process of making organic acids from carbonaceous material | |
GB801387A (en) | Process for the production of aromatic hydroperoxides, carbinols, ketones and carboxylic acids | |
ES447406A1 (en) | Process for the preparation of propylene oxide | |
US2587666A (en) | Oxidation of aromatic compounds containing oxygenated side chains | |
GB579669A (en) | Improvements in or relating to the production of cellulose | |
GB774920A (en) | Improvements in the production of pure benzene carboxylic acids | |
GB727498A (en) | The manufacture of organic hydroperoxides | |
GB700546A (en) | Hydroperoxides | |
US2973310A (en) | Process for the oxidation of organic compounds | |
GB768474A (en) | Improvements in the production of aromatic carboxylic acids | |
GB729132A (en) | Process for the preparation of hydroperoxides | |
GB915510A (en) | Improvements in or relating to the production of trialkyladipic acids | |
GB858890A (en) | Process of producing crystalline ortho, ortho-bis(para-1,1,3,3-tetramethylbutylphenol) monosulphide and nickel derivatives thereof | |
GB668931A (en) | Production of oxygen-containing compounds by oxidation of hydrocarbons | |
GB1128953A (en) | Process for the production of alkali-metal peroxides | |
GB621639A (en) | Improvements in or relating to the refining of tar acids | |
GB748287A (en) | Phenol production | |
GB697776A (en) | Process for the preparation of cumene hydroperoxide | |
GB726675A (en) | Improvements in or relating to the purification of aromatic acids | |
GB787054A (en) | The oxidation of para-dialkylbenzenes to terephthalic acid and other oxidation products | |
GB787282A (en) | Process for the manufacture of isonicotinyl hydrazide | |
GB784681A (en) | Improvements in and relating to the production of aromatic oxygen-containing compounds | |
GB741380A (en) | Process for the production of aromatic dicarboxylic acids | |
GB833680A (en) | Production of aromatically substituted carbinols | |
GB755854A (en) | Improvements in the production of aromatic carboxylic acids |