GB436464A - Improvements in or relating to the manufacture of naphthylaminesulphonic acids - Google Patents

Improvements in or relating to the manufacture of naphthylaminesulphonic acids

Info

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
Application number
GB10989/34A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
EIDP Inc
Original Assignee
EI Du Pont de Nemours and Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by EI Du Pont de Nemours and Co filed Critical EI Du Pont de Nemours and Co
Publication of GB436464A publication Critical patent/GB436464A/en
Expired legal-status Critical Current

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.
GB10989/34A 1933-04-11 1934-04-11 Improvements in or relating to the manufacture of naphthylaminesulphonic acids Expired GB436464A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (6)

* Cited by examiner, † Cited by third party
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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