CH141752A - Process for the production of a halogen derivative of terephthalic acid. - Google Patents

Process for the production of a halogen derivative of terephthalic acid.

Info

Publication number
CH141752A
CH141752A CH141752DA CH141752A CH 141752 A CH141752 A CH 141752A CH 141752D A CH141752D A CH 141752DA CH 141752 A CH141752 A CH 141752A
Authority
CH
Switzerland
Prior art keywords
terephthalic acid
production
acid
halogen derivative
chlorine
Prior art date
Application number
Other languages
German (de)
Inventor
Aktiengesellsc Farbenindustrie
Original Assignee
Ig Farbenindustrie 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 Ig Farbenindustrie Ag filed Critical Ig Farbenindustrie Ag
Publication of CH141752A publication Critical patent/CH141752A/en

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Description

  

  Verfahren zur Herstellung eines Halogenderivates der     Terephthalsäure.       Vorliegendes Patent bezieht sich auf ein  Verfahren zur Herstellung der 2.     5-Dichlor-          terephthalsäure    der Formel:  
EMI0001.0004     
    dadurch gekennzeichnet, dass man     1.4-Di-          methyl-2.5-dichlorbenzol    unter Belichtung  bei erhöhter Temperatur mit solchen Mengen  Chlor behandelt, bis die Gewichtszunahme  den Eintritt von 6 Chloratomen anzeigt und  das gebildete neue     2.5-Dichlor-terephthal-          säure-hexachlorid    verseift.  



  Die so erhaltene     2.5-Dichlor-terephthal-          säure    schmilzt über<B>3000,</B> ihr     Dimethylester     bei     137-138,    während in den Berichten  der Deutschen Chemischen Gesellschaft, Band         21-,    Seite 1960, 131-132   als Schmelzpunkt  angeführt wird.  



  <I>Beispiel:</I>  1     .4-Dimethyl-2.        5-dichlorbenzol    wird bei  <B>180'</B> unter starker Belichtung mit Chlor be  handelt, bis kein Chlor mehr aufgenommen  wird. Die absorbierte Menge Chlor entspricht  nahezu 6 Atomen. Das so erhaltene 2. 5  Dichlor-terephthalsäure-hexachlorid ist eine  farblose Flüssigkeit, die bei gewöhnlichem  Druck über 300   siedet.  



  Um das so erhaltene     Monochlor-tereph-          thalsäurehexachlorid    zu verseifen; werden  526 Teile des Rohproduktes unter Rühren  bei 70-100   mit 1400 Teilen Schwefelsäure  von 66   Bö versetzt. Wenn die starke Salz  säureentwicklung aufgehört hat, wird die  Masse auf Eis gegossen. Das ausfallende  Rohprodukt wird von geringen Mengen Neben  produkten durch Auflösen mit Natronlauge  und Wiederausfällen dieser Lösung mit Säure      befreit. Auf diese Weise wird die reine     2.5-          Dichlor-terephthalsäure    erhalten.



  Process for the production of a halogen derivative of terephthalic acid. The present patent relates to a process for the production of the 2.5-dichloro terephthalic acid of the formula:
EMI0001.0004
    characterized in that 1,4-dimethyl-2,5-dichlorobenzene is treated with exposure at elevated temperature with such amounts of chlorine until the increase in weight indicates the entry of 6 chlorine atoms and the new 2.5-dichloroterephthalic acid hexachloride formed is saponified.



  The 2,5-dichloro-terephthalic acid obtained in this way melts over 3000, its dimethyl ester at 137-138, while in the reports of the German Chemical Society, Volume 21-, page 1960, 131-132 is given as the melting point becomes.



  <I> Example: </I> 1 .4-Dimethyl-2. At <B> 180 '</B> 5-dichlorobenzene is treated with chlorine under strong light until no more chlorine is absorbed. The amount of chlorine absorbed is almost 6 atoms. The 2.5 dichloroterephthalic acid hexachloride obtained in this way is a colorless liquid which boils above 300 at normal pressure.



  In order to saponify the monochloroterephthalic acid hexachloride thus obtained; 526 parts of the crude product are mixed with 1400 parts of sulfuric acid of 66 Bo with stirring at 70-100. When the strong development of hydrochloric acid has ceased, the mass is poured onto ice. The precipitating crude product is freed from small amounts of by-products by dissolving it with sodium hydroxide solution and reprecipitating this solution with acid. In this way the pure 2,5-dichloroterephthalic acid is obtained.

Claims (1)

PATENTANSPRUCH: Verfahren zur Herstellung der 2.5-Di- chlor-terephthalsäure der Formel: EMI0002.0005 dadurch gekennzeichnet, dass man 1.4-Di- methyl-2.5-dichlorbenzol unter Belichtung bei erhöhter Temperatur mit solchen Mengen Chlor behandelt, bis die Gewichtszunahme den Eintritt von 6 Chloratomen anzeigt und das gebildete neue 2.5-Diohlor-terephthal- säure-hegachlorid verseift. Die so erhaltene 2.5-Diohlor-terephthal- säure schmilzt über<B>300',</B> ihr Dimethylester bei 137-138<B>0</B>. PATENT CLAIM: Process for the production of 2.5-dichloroterephthalic acid of the formula: EMI0002.0005 characterized in that 1,4-dimethyl-2,5-dichlorobenzene is treated with exposure at elevated temperature with such amounts of chlorine until the increase in weight indicates the entry of 6 chlorine atoms and the new 2.5-diochloro-terephthalic acid hegachloride formed is saponified. The 2,5-diochloro-terephthalic acid obtained in this way melts over <B> 300 ', </B> its dimethyl ester at 137-138 <B> 0 </B>.
CH141752D 1927-11-11 1928-11-08 Process for the production of a halogen derivative of terephthalic acid. CH141752A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE141752X 1927-11-11
CH138867T 1928-11-08

Publications (1)

Publication Number Publication Date
CH141752A true CH141752A (en) 1930-08-15

Family

ID=25713249

Family Applications (1)

Application Number Title Priority Date Filing Date
CH141752D CH141752A (en) 1927-11-11 1928-11-08 Process for the production of a halogen derivative of terephthalic acid.

Country Status (1)

Country Link
CH (1) CH141752A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2814648A (en) * 1952-08-28 1957-11-26 Glanzstoff Ag Preparation of 1, 4-bis (trichloromethyl)-2, 5-dichlorobenzene

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2814648A (en) * 1952-08-28 1957-11-26 Glanzstoff Ag Preparation of 1, 4-bis (trichloromethyl)-2, 5-dichlorobenzene

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