GB436464A - Improvements in or relating to the manufacture of naphthylaminesulphonic acids - Google Patents
Improvements in or relating to the manufacture of naphthylaminesulphonic acidsInfo
- Publication number
- GB436464A GB436464A GB10989/34A GB1098934A GB436464A GB 436464 A GB436464 A GB 436464A GB 10989/34 A GB10989/34 A GB 10989/34A GB 1098934 A GB1098934 A GB 1098934A GB 436464 A GB436464 A GB 436464A
- Authority
- GB
- United Kingdom
- Prior art keywords
- naphthol
- ammonia
- sulphonated
- naphthylamine
- neutralized
- 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
Abstract
b -naphthylamine sulphonic acids are obtained from b -naphthol by sulphonating followed by amination of the sulphonated b -naphthol directly after neutralizing, by the Bucherer method. Specification 1387/00, [Class 2], is referred to. According to examples: (1) b -naphthol is sulphonated with chloro-sulphonic acid in ethylene dichloride at 0 DEG C., the 2-naphthol-1-sulphonic acid obtained, neutralized with ammonia, heated with anhydrous NH3 and SO2 under pressure, and 2-naphthylamine-1-sulphonic acid isolated; (2) b -naphthol is sulphonated with 96 per cent sulphuric acid and sodium sulphate, the product neutralized with aqueous ammonia, heated under pressure with ammonium sulphite and ammonia, and 2-naphthylamine-6-sulphonic acid isolated and purified if necessary; (3) b -naphthol is sulphonated with 95 per cent sulphuric acid at -2 DEG C., the product is neutralized with ammonia, heated under pressure with ammonium sulphite and ammonia, and the mixture of salts of 2-naphthylamine-1- and -8-sulphonic acids precipitated with sodium chloride; the products are suitable for the manufacture of azo dyes, pigments, and lakes.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US436464XA | 1933-04-11 | 1933-04-11 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB436464A true GB436464A (en) | 1935-10-11 |
Family
ID=21928170
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB10989/34A Expired GB436464A (en) | 1933-04-11 | 1934-04-11 | Improvements in or relating to the manufacture of naphthylaminesulphonic acids |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB436464A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2398725A1 (en) * | 1977-07-29 | 1979-02-23 | American Cyanamid Co | IMPROVEMENTS IN THE PREPARATION OF 2-AMINO-1-NAPHTALENESULPHONIC ACID |
FR2398726A1 (en) * | 1977-07-29 | 1979-02-23 | American Cyanamid Co | 2-AMINO-1-NAPHTHALENESULPHONIC ACID PREPARATION PROCESS |
EP0031299A2 (en) * | 1979-12-20 | 1981-07-01 | Ciba-Geigy Ag | Process for the preparation of 2-amino-1-naphthalene sulfonic acid |
EP0218005A1 (en) * | 1985-10-09 | 1987-04-15 | Hoechst Aktiengesellschaft | Single pot process for the production of 2-acetamidonaphthalene-6-sulphonic acid with a high purity |
-
1934
- 1934-04-11 GB GB10989/34A patent/GB436464A/en not_active Expired
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2398725A1 (en) * | 1977-07-29 | 1979-02-23 | American Cyanamid Co | IMPROVEMENTS IN THE PREPARATION OF 2-AMINO-1-NAPHTALENESULPHONIC ACID |
FR2398726A1 (en) * | 1977-07-29 | 1979-02-23 | American Cyanamid Co | 2-AMINO-1-NAPHTHALENESULPHONIC ACID PREPARATION PROCESS |
EP0031299A2 (en) * | 1979-12-20 | 1981-07-01 | Ciba-Geigy Ag | Process for the preparation of 2-amino-1-naphthalene sulfonic acid |
EP0031299A3 (en) * | 1979-12-20 | 1981-07-15 | Ciba-Geigy Ag | Process for the preparation of 2-amino-1-naphthalene sulfonic acid |
EP0218005A1 (en) * | 1985-10-09 | 1987-04-15 | Hoechst Aktiengesellschaft | Single pot process for the production of 2-acetamidonaphthalene-6-sulphonic acid with a high purity |
US4908478A (en) * | 1985-10-09 | 1990-03-13 | Hoechst Aktiengesellschaft | Single-vessel process for preparing 2-acetaminonaphthalene-6-sulfonic acid of high purity |
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