GB756472A - A process for converting naphthalic acid into naphthalene-2.6-dicarboxylic acid - Google Patents
A process for converting naphthalic acid into naphthalene-2.6-dicarboxylic acidInfo
- Publication number
- GB756472A GB756472A GB6931/54A GB693154A GB756472A GB 756472 A GB756472 A GB 756472A GB 6931/54 A GB6931/54 A GB 6931/54A GB 693154 A GB693154 A GB 693154A GB 756472 A GB756472 A GB 756472A
- Authority
- GB
- United Kingdom
- Prior art keywords
- acid
- naphthalene
- naphthalic
- dicarboxylic acid
- salt
- 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
- C07C51/41—Preparation of salts of carboxylic acids
- C07C51/412—Preparation of salts of carboxylic acids by conversion of the acids, their salts, esters or anhydrides with the same carboxylic acid part
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
In a process for the conversion of naphthalic acid into naphthalene-2,6-dicarboxylic acid or a derivative thereof the dipotassium salt of naphthalic acid is heated to temperatures above 340 DEG C., thereby obtaining the dipotassium salt of naphthalene-2,6-dicarboxylic acid. Elevated or normal pressures may be employed and carbon dioxide may be present. Metals such as zinc, cadmium and lead and their compounds, e.g. the oxides, are mentioned as catalysts which may be employed and the catalysts may be applied to carrier materials. The potassium salt of naphthalic acid may be mixed with sand, coke, inert salts, e.g. potassium carbonate, sulphate and chloride or pieces of inert metal to facilitate thermal conduction within the heated salt. Reaction mixtures which produce the dipotassium salt of naphthalic acid on heating may be used as starting materials, e.g. mixtures of naphthalic acid, anhydride and potassium carbonate. Free naphthalene-2,6-dicarboxylic acid can be obtained by acidifying an aqueous solution of the salt or the latter may be converted directly, e.g. to the dichloride or esters. In exaples: naphthalene-2,6-dicarboxylic acid is obtained by heating anhydrous potassium carbonate and naphthalic anhydride under carbon dioxide at elevated pressure, dissolving the product in water and acidifying with hydrochloric acid (1) and in similar processes cadmium oxide, zinc oxide, litharge and metallic lead are employed as catalysts (2). The conversion of naphthalene-2,6-dicarboxylic acid to the dichloride, the dimethyl ester and the diamide is mentioned.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE756472X | 1953-03-11 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB756472A true GB756472A (en) | 1956-09-05 |
Family
ID=6659835
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB6931/54A Expired GB756472A (en) | 1953-03-11 | 1953-03-10 | A process for converting naphthalic acid into naphthalene-2.6-dicarboxylic acid |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB756472A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001016075A1 (en) * | 1999-08-30 | 2001-03-08 | Mossi & Ghisolfi Overseas S.A. | Process for making an aromatic diacid in one step using a single catalyst system |
-
1953
- 1953-03-10 GB GB6931/54A patent/GB756472A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001016075A1 (en) * | 1999-08-30 | 2001-03-08 | Mossi & Ghisolfi Overseas S.A. | Process for making an aromatic diacid in one step using a single catalyst system |
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