AT81251B - Process for the preparation of hydroquinone. Process for the preparation of hydroquinone. - Google Patents

Process for the preparation of hydroquinone. Process for the preparation of hydroquinone.

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Publication number
AT81251B
AT81251B AT81251DA AT81251B AT 81251 B AT81251 B AT 81251B AT 81251D A AT81251D A AT 81251DA AT 81251 B AT81251 B AT 81251B
Authority
AT
Austria
Prior art keywords
hydroquinone
preparation
sodium
sulfonic acid
sulfuric acid
Prior art date
Application number
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German (de)
Original Assignee
Oesterreichischer Ver Fuer Che
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.)
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Publication date
Application filed by Oesterreichischer Ver Fuer Che filed Critical Oesterreichischer Ver Fuer Che
Application granted granted Critical
Publication of AT81251B publication Critical patent/AT81251B/en

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  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Description

  

   <Desc/Clms Page number 1> 
 



  Verfahren zur Darstellung von Hydrochinon. 



   Schmitzt man p-dichlorbenzolsulfosaures Natron mit einem Überschuss von Natronlauge bei   I80#200 , so   werden beide Halogenatome durch Hydroxyl ersetzt. Es ist zwar schon bekannt (vergl. D. R. P. Xr. I37II9), dass man durch Schmelzen von o-dichlorbenzolsulfosaurem Natron mit Alkali bei   200#230    brenzkatechinsulfosaures Natron erhält. Die Möglichkeit einer Übertragung dieser Reaktion auf die Parareihe war aber nicht ohne weiteres vorauszusehen. weil die bekannte Empfindlichkeit des Hydrochinons gegen Sauerstoff bei   Gegenwart von überschüssigem Alkali   eher   störende Nebenreaktionen erwarten   liess. Die Umwandlung lässt sich aber durchführen und die erhaltene Hydrochinonsulfosäure ist so 
 EMI1.1 
 Hydrochinon liefert. 



   Beispiel 1 : 15 kg p-dichlorbenzolsuliosaures Natron werden unter Umrühren in 30 kg Natronlange von 50  Bé eingetragen und unter Umrühren erhitzt, so dass die 
 EMI1.2 
 wird nach und nach trocken und krümmelig. Man löst in Wasser auf und verbetzt so lange   mit verdünnter Schwefelsäure, bis die Masse kongosauer   ist. Hierauf wird eingedampft und so die Hauptmenge des Natiumsulfates abgeschieden.

   Nach dem Filtrieren und Erkalten erstarrt die   Flüssigkeit   zu einem Brei feiner Nadeln von   Hydrochinonsulfosäure.   Ihre Lösung in Wasser reduziert ammoniakalische   Silberlösung   sofort in der Kälte, färbt sich mit   Ammoniak gelb und gibt mit alkoholischer Eisenchloridlösung   eine beständige, tief indigo-   blaue Färbung@  
Beispiel 2 : 10 Teile der   nach Beispiel i   erhaltenen   Hydrochinonsulfosäure   werden 
 EMI1.3 
 erhalten wird. 

**WARNUNG** Ende DESC Feld kannt Anfang CLMS uberlappen**.



   <Desc / Clms Page number 1>
 



  Process for the preparation of hydroquinone.



   If p-dichlorobenzenesulfonate is mixed with sodium hydroxide solution at 180 ° 200, both halogen atoms are replaced by hydroxyl. It is already known (see D. R. P. Xr. I37II9) that one obtains sodium catechol sulfonic acid by melting o-dichlorobenzenesulfonic acid soda with alkali at 200 # 230. However, the possibility of this reaction being carried over to the parallel series could not be foreseen without further ado. because the well-known sensitivity of hydroquinone to oxygen in the presence of excess alkali led to expect rather troublesome side reactions. However, the conversion can be carried out and the hydroquinone sulfonic acid obtained is like that
 EMI1.1
 Hydroquinone supplies.



   Example 1: 15 kg of p-dichlorobenzene sulphate are introduced into 30 kg of sodium bicarbonate length of 50 Bé with stirring and heated with stirring so that the
 EMI1.2
 gradually becomes dry and crumbly. It is dissolved in water and mixed with dilute sulfuric acid until the mass is acidic to the Congo. It is then evaporated and the main amount of the sodium sulfate is deposited.

   After filtering and cooling, the liquid solidifies into a paste of fine needles of hydroquinone sulfonic acid. Their solution in water reduces ammoniacal silver solution immediately in the cold, turns yellow with ammonia and gives a permanent, deep indigo blue coloration with alcoholic ferric chloride solution @
Example 2: 10 parts of the hydroquinone sulfonic acid obtained according to Example i
 EMI1.3
 is obtained.

** WARNING ** End of DESC field may overlap beginning of CLMS **.

Claims (1)

PATENT-ANSPRUCH : Verfahren zur Darstellung von Hydrochinon, dadurch gekennzeichnet, dass man p-dichlorbenzolsulfosaures Natrium bei 180-2000 mit einem Überschuss von Natronlauge schmilzt und die aus der Schmelze in Form ihres Natronsalzes abgeschiedene Hydrochinon- sulfosäure durch Kochen mit verdünnter Schwefelsäure in Hydrochinon und Schwefelsäure zerlegt, worauf das Hydrochinon in üblicher Weise isoliert wird. **WARNUNG** Ende CLMS Feld Kannt Anfang DESC uberlappen**. PATENT CLAIM: Process for the preparation of hydroquinone, characterized in that sodium p-dichlorobenzenesulfonic acid is melted at 180-2000 with an excess of sodium hydroxide solution and the hydroquinone sulfonic acid separated from the melt in the form of its sodium salt is broken down into hydroquinone and sulfuric acid by boiling with dilute sulfuric acid, whereupon the hydroquinone is isolated in the usual way. ** WARNING ** End of CLMS field may overlap beginning of DESC **.
AT81251D 1917-11-21 1917-11-21 Process for the preparation of hydroquinone. Process for the preparation of hydroquinone. AT81251B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT81251T 1917-11-21

Publications (1)

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AT81251B true AT81251B (en) 1920-09-10

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ID=3602771

Family Applications (1)

Application Number Title Priority Date Filing Date
AT81251D AT81251B (en) 1917-11-21 1917-11-21 Process for the preparation of hydroquinone. Process for the preparation of hydroquinone.

Country Status (1)

Country Link
AT (1) AT81251B (en)

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