Title:
MANUFACTURE OF 1-NAPHTHYLAMINE-4,8-DISULFONIC ACID
Document Type and Number:
Japanese Patent JPS5855452
Kind Code:
A
Abstract:
Process for the isolation of 1-naphthylamine-4,8-disulphonic acid from sulphonation mixtures containing it according to which process the sulphonation mixture is introduced into preheated water in such a manner that, at the start of crystallization, a temperature of at least 100 DEG C. is reached and the 1-naphthylamine-4,8-disulphonic acid is separated from the mother liquor at a temperature not higher than 70 DEG C. The process is applied particularly advantageously for the isolation of 1-naphthylamine-4,8-disulphonic acid from sulphonation mixtures which have been obtained by introducing in turns alkali metal sulphate, 1-naphthylamine-8-sulphonic acid and SO3 into sulphuric acid which has been introduced initially, a total of 1.5 to 3 mols of SO3 and 0.6 to 1.5 mols of alkali metal sulphate being employed per mol of 1-naphthylamine-8-sulphonic acid.
Inventors:
HAINTSU URURITSUHI BURANKU
HORUSUTO BEERE
HANSU BERUNAA RINDEN
BERUNAA MENTSUERU
HORUSUTO BEERE
HANSU BERUNAA RINDEN
BERUNAA MENTSUERU
Application Number:
JP15407482A
Publication Date:
April 01, 1983
Filing Date:
September 06, 1982
Export Citation:
Assignee:
BAYER AG
International Classes:
C07C309/47; C07C67/00; C07C301/00; C07C303/44; (IPC1-7): C07C143/60
Domestic Patent References:
| JP26004927A |
Attorney, Agent or Firm:
Heiyoshi Odashima
Previous Patent: 遊技球用島間搬送路、並びに、遊技場の構造
Next Patent: PREPARATION OF OPTICALLY ACTIVE MERCAPTOCARBOXYLIC ACID
Next Patent: PREPARATION OF OPTICALLY ACTIVE MERCAPTOCARBOXYLIC ACID