AT40072B - Process for the preparation of leuco dyes of the indigo group. - Google Patents

Process for the preparation of leuco dyes of the indigo group.

Info

Publication number
AT40072B
AT40072B AT40072DA AT40072B AT 40072 B AT40072 B AT 40072B AT 40072D A AT40072D A AT 40072DA AT 40072 B AT40072 B AT 40072B
Authority
AT
Austria
Prior art keywords
preparation
leuco dyes
indigo
group
indigo group
Prior art date
Application number
Other languages
German (de)
Original Assignee
Basf Ag
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 Basf Ag filed Critical Basf Ag
Application granted granted Critical
Publication of AT40072B publication Critical patent/AT40072B/en

Links

Description

  

   <Desc/Clms Page number 1> 
 
 EMI1.1 
 
 EMI1.2 
 

 <Desc/Clms Page number 2> 

 



   Die nach vorliegendem Verfahren entstehenden alkoholischen Indigewisslösungen können von den festem Rückständen leicht unter völligem Ausschluss von Luft abfiltriert und   gegebenenfalls zur Gewinnung   von festem Indigweiss bei gewöhnlichem oder vermindertem Druck eingedampft werden. 



    Beispiel I.   



   200 Teile Indigopulver rein B. A. S. F. werden in 2000 Gewichtsteilen Alkohol 
 EMI2.1 
 fast 100   prozentiges   Tndigweiss in sehr gut haltbarer Form. 



    Beispiel II.   
 EMI2.2 
 dem Wasserbade erhitzt. 



   13 e i s p i e l IV. 
 EMI2.3 
 hiezu 100 Teile einer frisch bereiteten wässerigen Zinkhydrosulfitlösung von 40% Hydrosulfitgehalt hinzugegeben. Beim Erwärmen tritt sofort   Indigweissbildung   ein. Die abgetrennte alkoholische Lösung liefert nach dem Eindampfen im   Vakuum   praktisch reines Indigweiss. 
 EMI2.4 
 stitutionsprodukte und Analogen, wie z. B. Thioindigo. 



   PATENT-ANSPRÜCHE : 
 EMI2.5 
 Säure, dadurch gekennzeichnet, dass man die Reduktion bei Gegenwart von Alkohol solcher Konzentration bewirkt, dass das gebildete   Indigweiss   gelöst wird, die entstehonden Salze 
 EMI2.6 




   <Desc / Clms Page number 1>
 
 EMI1.1
 
 EMI1.2
 

 <Desc / Clms Page number 2>

 



   The alcoholic indigenous white solutions produced by the present process can easily be filtered off from the solid residues with complete exclusion of air and, if necessary, evaporated under normal or reduced pressure to obtain solid indigenous white.



    Example I.



   200 parts of pure B.A. S.F. indigo powder are converted into 2000 parts by weight of alcohol
 EMI2.1
 almost 100 percent Tndigweiss in a very durable form.



    Example II.
 EMI2.2
 heated in the water bath.



   13 e i s p i e l IV.
 EMI2.3
 100 parts of a freshly prepared aqueous zinc hydrosulfite solution with a hydrosulfite content of 40% were added to this. When heated, indigo whitening occurs immediately. The separated alcoholic solution provides practically pure indig white after evaporation in a vacuum.
 EMI2.4
 institution products and analogs, such as. B. Thioindigo.



   PATENT CLAIMS:
 EMI2.5
 Acid, characterized in that the reduction is effected in the presence of alcohol in such a concentration that the indigenous white formed is dissolved, the resulting salts
 EMI2.6

Claims (1)

'2. Ausführungsform des Verfahrens nach Anspruch J, dadurch gekennzeichnet, dass man bei Anwendung von Zinkstaub und schwefliger Säure oder Bisulfit von letzteren beiden EMI2.7 '2. Embodiment of the method according to claim J, characterized in that when using zinc dust and sulphurous acid or bisulphite of the latter two EMI2.7
AT40072D 1908-05-29 1908-05-29 Process for the preparation of leuco dyes of the indigo group. AT40072B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT40072T 1908-05-29

Publications (1)

Publication Number Publication Date
AT40072B true AT40072B (en) 1909-12-10

Family

ID=3558378

Family Applications (1)

Application Number Title Priority Date Filing Date
AT40072D AT40072B (en) 1908-05-29 1908-05-29 Process for the preparation of leuco dyes of the indigo group.

Country Status (1)

Country Link
AT (1) AT40072B (en)

Similar Documents

Publication Publication Date Title
AT40072B (en) Process for the preparation of leuco dyes of the indigo group.
DE642246C (en) Process for the preparation of furfural
DE335869C (en) Process for the production of a tannin substitute
DE204568C (en)
DE317462C (en)
CH143895A (en) Method for the preparation of an o-cyanaryl mercaptan.
DE170520C (en)
AT49736B (en) Process for the preparation of octadionol and its homologues.
AT61113B (en) Process for the production of highly concentrated, durable, non-drying indigo white preparations.
AT110124B (en) Process for the production of sodium formate.
CH179654A (en) Process for the preparation of a new quaternary salt.
CH120257A (en) Process for the preparation of a new oxynaphthalene carboxylic acid.
CH220408A (en) Process for the preparation of an oxyarylsulfone.
CH145156A (en) Process for the preparation of a vat dye.
CH125714A (en) Process for the preparation of the sodium salt of (4&#39;-sulfo) -2-benzoyl-benzoic acid.
CH188770A (en) Process for the preparation of octadecylaminoacetic acid.
CH187007A (en) Process for the preparation of a cyclic ketone.
CH191733A (en) Process for the preparation of a new sulfonic acid.
CH220407A (en) Process for the preparation of an oxyarylsulfone.
CH220409A (en) Process for the preparation of an oxyarylsulfone.
CH179662A (en) Process for the preparation of a new quaternary salt.
CH157251A (en) Process for the production of a vat dye preparation.
CH143896A (en) Method for the preparation of an o-cyanaryl mercaptan.
CH156338A (en) Process for the preparation of a tin complex salt.
CH186728A (en) Process for the production of a preparation suitable for the production of matting baths.