AT81072B - Process for the preparation of p-chlorophenol. Process for the preparation of p-chlorophenol. - Google Patents

Process for the preparation of p-chlorophenol. Process for the preparation of p-chlorophenol.

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Publication number
AT81072B
AT81072B AT81072DA AT81072B AT 81072 B AT81072 B AT 81072B AT 81072D A AT81072D A AT 81072DA AT 81072 B AT81072 B AT 81072B
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AT
Austria
Prior art keywords
chlorophenol
preparation
dichlorobenzene
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
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Publication of AT81072B publication Critical patent/AT81072B/en

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Description

  

   <Desc/Clms Page number 1> 
 



  Verfahren zur Darstellung von p-Chlorphenol. 
 EMI1.1 
 selbst mit Schwefelsäure bestimmter Konzentration (Mischung gleicher Teile Wasser und Schwefelsäure von 660 Bé) unter Rückfluss kocht, wobei in sehr guter Ausbeute p-Chlorphenol erhalten wird. Da die durch Sulfiren von   p-Dichlorbenzol   in bekannter Weise leicht erhältliche p-Dichlorbenzolsäure mit verdünnter Natronlauge unter Druck   bekannt Ich   glatt in die   p-Clilorphenolsulfosiiure   übergeht, ist mit der beschriebenen Reaktion ein einfacher   Weg vom p-Dichlorbenzol   zu dem wertvollen p-Chlorphenol gegeben. Es war zwar schon bekannt, dass man die Sulfogruppe aus   o-Chlorphenolsulfosäure   abspalten kann   (vergl.   D. R. P. Nr. 141751).

   Nach diesem Verfahren wird die Abspaltung aber bei höherer 
 EMI1.2 
 fahren das Arbeiten in offenen Gefässen. 



   Beispiel : 100 kg p-chlorphenolsulfosaures Natrium werden mit 1000   l   einer Mischung 
 EMI1.3 
 keine Zunahme der sich bald abscheidenden, öligen Schicht von   p-Chlorphenol   mehr festzustellen ist. Hierauf trennt man das   dunkelgef bte   Öl nach dem Erkalten von der schwefelsauren Unterlage ab, trocknet und destilliert es in der Kolonne. wobei ohne jeden Vorlauf über   210    das p-Chlorphenol innerhalb von zwei Graden übergeht. Es erstarrt manchmal von selbst, sicher beim Abkühlen und Impfen zu schneeweissen Kristallen. 

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



   <Desc / Clms Page number 1>
 



  Process for the preparation of p-chlorophenol.
 EMI1.1
 boils under reflux even with sulfuric acid of a certain concentration (mixture of equal parts of water and sulfuric acid of 660 Bé), whereby p-chlorophenol is obtained in very good yield. Since p-dichlorobenzene acid, which is easily obtainable in a known manner by sulphuring p-dichlorobenzene with dilute sodium hydroxide solution under pressure, is known to convert smoothly into p-clilophenol sulfonic acid, the reaction described provides a simple route from p-dichlorobenzene to valuable p-chlorophenol . It was already known that the sulfo group can be split off from o-chlorophenolsulfonic acid (cf. D. R. P. No. 141751).

   However, according to this process, the elimination is higher
 EMI1.2
 drive working in open vessels.



   Example: 100 kg of p-chlorophenolsulfonate are mixed with 1000 l of a mixture
 EMI1.3
 no increase in the soon-to-be-deposited, oily layer of p-chlorophenol can be observed. The dark colored oil is then separated from the sulfuric acid base after cooling, dried and distilled in the column. the p-chlorophenol passing over within two degrees without any run above 210. It sometimes freezes by itself, certainly when cooling and seeding, to snow-white crystals.

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

Claims (1)

PATENT-ANSPRUCH : Verfahren zur Darstellung von p-Chlorphenol, dadurch gekennzeichnet, dass man aus EMI1.4 **WARNUNG** Ende CLMS Feld Kannt Anfang DESC uberlappen**. PATENT CLAIM: Process for the preparation of p-chlorophenol, characterized in that from EMI1.4 ** WARNING ** End of CLMS field may overlap beginning of DESC **.
AT81072D 1917-11-21 1917-11-21 Process for the preparation of p-chlorophenol. Process for the preparation of p-chlorophenol. AT81072B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT81072T 1917-11-21

Publications (1)

Publication Number Publication Date
AT81072B true AT81072B (en) 1920-08-10

Family

ID=3602587

Family Applications (1)

Application Number Title Priority Date Filing Date
AT81072D AT81072B (en) 1917-11-21 1917-11-21 Process for the preparation of p-chlorophenol. Process for the preparation of p-chlorophenol.

Country Status (1)

Country Link
AT (1) AT81072B (en)

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