GB787937A - Improvements in or relating to the preparation of phthalic acids by oxidation of dialkyl benzenes - Google Patents
Improvements in or relating to the preparation of phthalic acids by oxidation of dialkyl benzenesInfo
- Publication number
- GB787937A GB787937A GB36764/55A GB3676455A GB787937A GB 787937 A GB787937 A GB 787937A GB 36764/55 A GB36764/55 A GB 36764/55A GB 3676455 A GB3676455 A GB 3676455A GB 787937 A GB787937 A GB 787937A
- Authority
- GB
- United Kingdom
- Prior art keywords
- acid
- reactor
- reaction
- returned
- passed
- 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
- C07C51/16—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation
- C07C51/21—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with molecular oxygen
- C07C51/255—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with molecular oxygen of compounds containing six-membered aromatic rings without ring-splitting
- C07C51/265—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with molecular oxygen of compounds containing six-membered aromatic rings without ring-splitting having alkyl side chains which are oxidised to carboxyl groups
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J39/00—Cation exchange; Use of material as cation exchangers; Treatment of material for improving the cation exchange properties
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Phthalic acids are prepared by a process which comprises oxidizing dialkyl benzenes by means of oxygen or a molecular oxygen-containing gas in a medium mainly consisting of an organic acid in which the dialkyl benzene is soluble, wherein iron ions are removed from the reaction medium or from portions thereof before commencement of the process and/or during the process so as to maintain the concentration of iron ions in the reaction medium below 100 parts per million. The process may be carried out by regularly removing a quantity of the reaction liquid from the reaction mixture, treating it for the removal of iron, e.g. by means of ion exchangers, and returning it to the system. Alternatively the reaction system may include means for removing iron through which part or all of the reaction mixture is circulated. The preferred organic acids are aliphatic carboxylic acids having 2-8 carbon atoms in the molecule. Specified dialkyl benzenes are diisopropyl benzenes. In examples: (1) p-diisopropylbenzene in solution in acetic acid is oxidized, under pressure with air and in the presence of cobalt acetate, manganese acetate, p-isopropylbenzoic acid and varying concentrations of iron ions, to give terephthalic acid and the results compared; (2) p-diisopropylbenzene is oxidized under pressure with air in acetic acid medium and in the presence of cobalt acetate and manganese acetate, in a stainless steel reactor, the gaseous products being passed to a distillation apparatus made of acid-proof stone from which the liquid bottom product is returned to the reactor, terephthalic acid is filtered off from the reaction mixture and the filtrate is passed through a cation exchange resin and returned to the reactor after the addition of fresh catalyst; (3) as in (2) but the reactor is made of acid-proof stone and the distillation apparatus of stainless steel, the liquid bottom product from the latter being passed through a cation exchanger before being returned to the reactor liquid. Specification 737,439 and U.S.A. Specification 2,552,268 are referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL787937X | 1954-12-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB787937A true GB787937A (en) | 1957-12-18 |
Family
ID=19832324
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB36764/55A Expired GB787937A (en) | 1954-12-28 | 1955-12-22 | Improvements in or relating to the preparation of phthalic acids by oxidation of dialkyl benzenes |
Country Status (5)
| Country | Link |
|---|---|
| BE (1) | BE543954A (en) |
| DE (1) | DE1087589B (en) |
| FR (1) | FR1153082A (en) |
| GB (1) | GB787937A (en) |
| NL (2) | NL100589C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130310582A1 (en) * | 2011-02-04 | 2013-11-21 | Dow Global Technologies Llc | Process for removing iron ions from an organic stream |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2552268A (en) * | 1949-03-22 | 1951-05-08 | Monsanto Chemicals | Liquid phase oxidation |
-
0
- BE BE543954D patent/BE543954A/xx unknown
- NL NL193567D patent/NL193567A/xx unknown
- NL NL100589D patent/NL100589C/xx active
-
1955
- 1955-12-20 DE DEN11634A patent/DE1087589B/en active Pending
- 1955-12-22 GB GB36764/55A patent/GB787937A/en not_active Expired
- 1955-12-28 FR FR1153082D patent/FR1153082A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130310582A1 (en) * | 2011-02-04 | 2013-11-21 | Dow Global Technologies Llc | Process for removing iron ions from an organic stream |
Also Published As
| Publication number | Publication date |
|---|---|
| NL100589C (en) | |
| BE543954A (en) | |
| DE1087589B (en) | 1960-08-25 |
| NL193567A (en) | |
| FR1153082A (en) | 1958-02-28 |
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