GB1399406A - Process for the preparation of rho-phenylenediamine - Google Patents
Process for the preparation of rho-phenylenediamineInfo
- Publication number
- GB1399406A GB1399406A GB1543973A GB1543973A GB1399406A GB 1399406 A GB1399406 A GB 1399406A GB 1543973 A GB1543973 A GB 1543973A GB 1543973 A GB1543973 A GB 1543973A GB 1399406 A GB1399406 A GB 1399406A
- Authority
- GB
- United Kingdom
- Prior art keywords
- weight
- terephthalic acid
- ammonia
- stage
- carried out
- 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
Landscapes
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Manufacture Of Macromolecular Shaped Articles (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Polyamides (AREA)
Abstract
1399406 p-Phenylene diamine AKZO NV 30 March 1973 [1 April 1972] 15439/73 Heading C2C p-Phenylene diamine is prepared by a process in which one or more polyesters of terephthalic acid are reacted in a first stage of the process with ammonia which contains not more than 15% by weight of water and the resulting terephthalic acid diamide is then subjected to Hofmann degradation in a second stage of the process. Ammonolyers of terephthalic acid polyesters is preferably carried out either in the liquid or in the gas phase at 50‹ to 300‹ C. and at ammonia pressures ranging from normal pressure to 300 atmospheres. Preferably ammonia which has a water content of not more than 5% by weight is used. Advantageously the Hofmann degradation is carried out using aqueous reaction mixtures at concentrations of the diamide of 3 to 5% by weight.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19722216117 DE2216117C3 (en) | 1972-04-01 | 1972-04-01 | Process for the preparation of p-phenylenediamine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1399406A true GB1399406A (en) | 1975-07-02 |
Family
ID=5840932
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1543973A Expired GB1399406A (en) | 1972-04-01 | 1973-03-30 | Process for the preparation of rho-phenylenediamine |
Country Status (12)
| Country | Link |
|---|---|
| JP (1) | JPS5754499B2 (en) |
| AT (1) | AT321269B (en) |
| BE (1) | BE797561A (en) |
| CA (1) | CA998068A (en) |
| CH (1) | CH577954A5 (en) |
| DD (1) | DD106636A5 (en) |
| DE (1) | DE2216117C3 (en) |
| ES (1) | ES413228A1 (en) |
| FR (1) | FR2178978B1 (en) |
| GB (1) | GB1399406A (en) |
| IT (1) | IT989535B (en) |
| NL (1) | NL7304531A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53122611A (en) * | 1977-03-31 | 1978-10-26 | Denki Kagaku Kogyo Kk | Desulfurizing agent for molten metal |
| EP0052511B1 (en) * | 1980-11-17 | 1984-03-07 | E.I. Du Pont De Nemours And Company | Production of p-phenylenediamine |
-
1972
- 1972-04-01 DE DE19722216117 patent/DE2216117C3/en not_active Expired
-
1973
- 1973-03-13 IT IT4878073A patent/IT989535B/en active
- 1973-03-28 CA CA167,379A patent/CA998068A/en not_active Expired
- 1973-03-29 DD DD16982073A patent/DD106636A5/xx unknown
- 1973-03-30 FR FR7311671A patent/FR2178978B1/fr not_active Expired
- 1973-03-30 BE BE129464A patent/BE797561A/en unknown
- 1973-03-30 GB GB1543973A patent/GB1399406A/en not_active Expired
- 1973-03-30 AT AT282273A patent/AT321269B/en not_active IP Right Cessation
- 1973-03-30 CH CH459773A patent/CH577954A5/xx not_active IP Right Cessation
- 1973-03-31 NL NL7304531A patent/NL7304531A/xx not_active Application Discontinuation
- 1973-03-31 ES ES413228A patent/ES413228A1/en not_active Expired
- 1973-04-02 JP JP3772073A patent/JPS5754499B2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| ES413228A1 (en) | 1976-01-01 |
| DE2216117A1 (en) | 1973-10-04 |
| AT321269B (en) | 1975-03-25 |
| CH577954A5 (en) | 1976-07-30 |
| DE2216117C3 (en) | 1981-04-02 |
| CA998068A (en) | 1976-10-05 |
| FR2178978A1 (en) | 1973-11-16 |
| DD106636A5 (en) | 1974-06-20 |
| NL7304531A (en) | 1973-10-03 |
| IT989535B (en) | 1975-06-10 |
| JPS4913126A (en) | 1974-02-05 |
| FR2178978B1 (en) | 1978-03-03 |
| BE797561A (en) | 1973-07-16 |
| DE2216117B2 (en) | 1980-07-31 |
| JPS5754499B2 (en) | 1982-11-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |