GB911691A - Improvements in or relating to the production of mellitic acid - Google Patents
Improvements in or relating to the production of mellitic acidInfo
- Publication number
- GB911691A GB911691A GB135761A GB135761A GB911691A GB 911691 A GB911691 A GB 911691A GB 135761 A GB135761 A GB 135761A GB 135761 A GB135761 A GB 135761A GB 911691 A GB911691 A GB 911691A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cyanide
- copper
- chromium
- iron
- 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
- C07C51/08—Preparation of carboxylic acids or their salts, halides or anhydrides from nitriles
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
Mellitic acid is made by heating together in aqueous alkaline solution in a pressure-resistant vessel tetrachlorophthalic acid, or its anhydride, or tetrachloroterephthalic acid, an alkali metal cyanide and copper cyanide, together with a catalyst comprising either an oxide or salt of iron, copper or chromium or a mixture thereof or a complex heavy metal cyanide salt, and recovering the mellitic acid formed. The alkali cyanide may be sodium cyanide, potassium cyanide or sodium potassium cyanide. Suitable catalysts are ferric oxide, ferrosyl hydroxide, ferrous hydroxide, the sulphates, chlorides and nitrates of iron, copper or chromium, or Berlin blue salt, potassium ferriferrohexacyanide. Addition of 0.5 to 5% of oxides or hydroxides of iron copper or chromium to the cyanide complex gives a further increased yield. The reaction takes place in the range 160 DEG to 260 DEG C. after between 4 and 15 hours, the pressure generally being from 25 to 100 atm. due to the evolution of ammonia. The catalyst may be recirculated in the process.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEB0056231 | 1960-01-13 | ||
| DEB56994A DE1114801B (en) | 1960-03-09 | 1960-03-09 | Process for the preparation of benzene polycarboxylic acids |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB911691A true GB911691A (en) | 1962-11-28 |
Family
ID=25965546
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB135761A Expired GB911691A (en) | 1960-01-13 | 1961-01-12 | Improvements in or relating to the production of mellitic acid |
Country Status (2)
| Country | Link |
|---|---|
| GB (1) | GB911691A (en) |
| NL (1) | NL260062A (en) |
-
0
- NL NL260062D patent/NL260062A/xx unknown
-
1961
- 1961-01-12 GB GB135761A patent/GB911691A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| NL260062A (en) |
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