DE77937C - Process for the preparation of a monosulfonic acid of ai a ^ -amidonaphthol - Google Patents

Process for the preparation of a monosulfonic acid of ai a ^ -amidonaphthol

Info

Publication number
DE77937C
DE77937C DENDAT77937D DE77937DA DE77937C DE 77937 C DE77937 C DE 77937C DE NDAT77937 D DENDAT77937 D DE NDAT77937D DE 77937D A DE77937D A DE 77937DA DE 77937 C DE77937 C DE 77937C
Authority
DE
Germany
Prior art keywords
acid
amidonaphthol
monosulfonic
chalk
monosulfonic acid
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 - Lifetime
Application number
DENDAT77937D
Other languages
German (de)
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.)
BASF SE
Original Assignee
Badische Anilin and Sodafabrik AG
Publication of DE77937C publication Critical patent/DE77937C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C309/00—Sulfonic acids; Halides, esters, or anhydrides thereof
    • C07C309/01—Sulfonic acids
    • C07C309/28—Sulfonic acids having sulfo groups bound to carbon atoms of six-membered aromatic rings of a carbon skeleton
    • C07C309/45—Sulfonic acids having sulfo groups bound to carbon atoms of six-membered aromatic rings of a carbon skeleton containing nitrogen atoms, not being part of nitro or nitroso groups, bound to the carbon skeleton
    • C07C309/49—Sulfonic acids having sulfo groups bound to carbon atoms of six-membered aromatic rings of a carbon skeleton containing nitrogen atoms, not being part of nitro or nitroso groups, bound to the carbon skeleton the carbon skeleton being further substituted by singly-bound oxygen atoms
    • C07C309/50—Sulfonic acids having sulfo groups bound to carbon atoms of six-membered aromatic rings of a carbon skeleton containing nitrogen atoms, not being part of nitro or nitroso groups, bound to the carbon skeleton the carbon skeleton being further substituted by singly-bound oxygen atoms having at least one of the sulfo groups bound to a carbon atom of a six-membered aromatic ring being part of a condensed ring system

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Description

Patenτ-Anspruch:Patenτ claim:

Verfahren zur Reinigung der nach dem Verfahren des Patents Nr. 62289 erhaltenen Amidonaphtolsulfosäure, darin bestehend, dafs man dieselbe durch Kochen mit Kreide neutralisirt und aus dem Filtrat mit Salzsäure fällt.Process for purifying amidonaphthol sulfonic acid obtained by the process of patent No. 62289, consisting in neutralizing it by boiling it with chalk, and precipitating it from the filtrate with hydrochloric acid.

BERLIN. GEDRUCKT IN DER REICHSDRUCKEREI.BERLIN. PRINTED IN THE REICHSDRUCKEREI.

Claims (1)

KAISERLICHESIMPERIAL PATENTAMT.PATENT OFFICE. Nach dem Verfahren des Patents Nr. 62289 entsteht bei der Einwirkung von concentrirter Schwefelsäure auf das U1 a4-Amidonaphtol bei gewöhnlicher Temperatur eine Monosulfosäure dieses Amidonaphtols, welche, wie in der genannten Patentschrift angegeben ist, aus heifsem Wasser, in welchem sie schwer löslich ist, in Form weifser Nadeln erhalten werden kann. Diese Kristallisation aus heifsem Wasser führt man in Rücksicht auf die geringe Löslichkeit der Säure in der Weise aus, dafs man eine nicht zu concentrirte heifse Lösung eines Salzes derselben ansäuert und nach dem Abfiltriren von einem dunkel gefärbten Niederschlag erkalten läfst. Die Säure kann nach dem Verfahren der Patente Nr. 54662 und Nr. 71199 sowohl roh als gereinigt zur Darstellung von Farbstoffen verwendet werden.According to the process of patent no. 62289, when concentrated sulfuric acid acts on the U 1 a 4 amidonaphthol at ordinary temperature, a monosulfonic acid of this amidonaphthol is formed, which, as stated in the patent mentioned, is made from hot water in which it is sparingly soluble can be obtained in the form of white needles. In view of the low solubility of the acid, this crystallization from hot water is carried out in such a way that a not too concentrated hot solution of a salt thereof is acidified and, after filtering off a dark colored precipitate, allowed to cool. The acid can be used both crude and purified to form dyes by the method of Patent Nos. 54662 and 71199. Es hat sich gezeigt, dafs die Reinigung der Säure besonders einfach sich gestaltet, wenn man zur Neutralisation der Rohsäure Kreide verwendet. Diese bildet mit einer die Amidonaphtolmonosulfosäure verunreinigenden isomeren Sulfosäure ein nahezu unlösliches Kalksalz, während das Hauptproduct, ■ die K1K4-Amidpnaphtol-ctg-monosulfosäure, mit Kreide ein leicht lösliches Salz liefert.It has been shown that the purification of the acid is particularly easy if chalk is used to neutralize the crude acid. This forms a virtually insoluble lime salt with an isomeric sulfonic acid which contaminates the amidonaphthol monosulfonic acid, while the main product, the K 1 K 4 amidpnaphthol-ctg-monosulfonic acid, provides a readily soluble salt with chalk. Beispiel:Example: Das nach dem Verfahren des Patents Nr. 62289 aus 10 kg CL1 a4-Amidonaphtolsulfat erhaltene Rohproduct der Monosulfosäure wird mit 200 1 Wasser aufgekocht und unter Kochen so lange mit Kreide versetzt, als noch Schäumen eintritt. Aus dem Filtrat wird die α, a4-Amidonaphtol-a3-monosulfosä'ure durch Salzsäure gefällt und nach dem Abfiltriren der Mutterlauge gewaschen, geprefst und getrocknet. The crude product of monosulfonic acid obtained from 10 kg of CL 1 a 4 amidonaphthol sulfate by the process of patent no. 62289 is boiled with 200 l of water and chalk is added while boiling until foaming occurs. The α, α 4 -amidonaphthol- α 3 -monosulfonic acid is precipitated from the filtrate with hydrochloric acid and, after the mother liquor has been filtered off, washed, pressed and dried.
DENDAT77937D Process for the preparation of a monosulfonic acid of ai a ^ -amidonaphthol Expired - Lifetime DE77937C (en)

Publications (1)

Publication Number Publication Date
DE77937C true DE77937C (en)

Family

ID=350702

Family Applications (1)

Application Number Title Priority Date Filing Date
DENDAT77937D Expired - Lifetime DE77937C (en) Process for the preparation of a monosulfonic acid of ai a ^ -amidonaphthol

Country Status (1)

Country Link
DE (1) DE77937C (en)

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