DE686908C - Process for the preparation of 5-oxytrimellitic acid - Google Patents

Process for the preparation of 5-oxytrimellitic acid

Info

Publication number
DE686908C
DE686908C DE1936I0054131 DEI0054131D DE686908C DE 686908 C DE686908 C DE 686908C DE 1936I0054131 DE1936I0054131 DE 1936I0054131 DE I0054131 D DEI0054131 D DE I0054131D DE 686908 C DE686908 C DE 686908C
Authority
DE
Germany
Prior art keywords
acid
oxytrimellitic
preparation
parts
treated
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
Application number
DE1936I0054131
Other languages
German (de)
Inventor
Dr Wilhelm Eckert
Dr Karl Schilling
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.)
IG Farbenindustrie AG
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
Priority to DE1936I0054131 priority Critical patent/DE686908C/en
Application granted granted Critical
Publication of DE686908C publication Critical patent/DE686908C/en
Expired legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
    • C07C51/347—Preparation of carboxylic acids or their salts, halides or anhydrides by reactions not involving formation of carboxyl groups
    • C07C51/367—Preparation of carboxylic acids or their salts, halides or anhydrides by reactions not involving formation of carboxyl groups by introduction of functional groups containing oxygen only in singly bound form

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Description

Verfahren zur Darstellung von 5-Oxytrimellitsäure Es wurde gefunden, daB man 5-OYytrimellitsäure in einfacher Weise und mit sehr guter Ausbeute darstellen kann, wenn man die durch Sulfonieren von Pseudocumol leicht erhältliche Pseudocumol-5-sulfonsäure mit Oxydationsmitteln behandelt und die so erhaltene Trimellitsäure-5-sulfonsäure in bekannter Weise mit Alkalien auf höhere Temperaturen erhitzt: Hierbei hat es sich als nicht notwendig :erwiesen, die Trimellitsäure-5-sulfonsäure zu isolieren: Die 5-O.xytrimellitsäure soll als Zwischenprodukt zur Darstellung von Farbstoffen aller Art verwendet werden.Process for the preparation of 5-oxytrimellitic acid It has been found that 5-OYytrimellitic acid can be prepared in a simple manner and with very good yield if the pseudocumene-5-sulphonic acid, which is easily obtained by sulphonating pseudocumene, is treated with oxidizing agents and the trimellitic acid obtained in this way is 5-sulfonic acid heated to higher temperatures with alkalis in a known manner: It has been found not to be necessary: to isolate the trimellitic acid-5-sulfonic acid: The 5-O.xytrimellitic acid should be used as an intermediate product for the preparation of dyes of all kinds.

Beispiel ioo Gewichtsteile pseudocumolsulfonsaures :\ dtrium und 20 Gewichtsteile Ätznatron werden in i5ooGewichtsteilen Wasser ,gelöst. Bei Temperaturen von go bis ioo° werden unter Rühren 4.5o Gewichsteile pulverisiertes Kaliumpermanganat in Anteilen nach Maßgabe des Verbrauches zugegeben. Ist die Oxydation beendet, so bleibt die violette Farbe des Permanganats einige Stunden bestehen. Dann wird durch vorsichtigen Zusatz von z. B.. Alkohol die Lösung entfärbt und vom ausgeschiedenen Braunstein abgesaugt. Der Braunstein wird mit Wasser gründlich ausgekocht und nochmals abgesaugt.Example 100 parts by weight of pseudocumensulfonic acid: \ dtrium and 20 Parts by weight of caustic soda are dissolved in 1500 parts by weight of water. At temperatures from 0 to 100 °, 4.5o parts by weight of powdered potassium permanganate are added while stirring added in proportions according to consumption. When the oxidation is over, so the purple color of the permanganate persists for a few hours. Then through careful addition of z. B .. alcohol the solution discolored and excreted from Brownstone sucked off. The brownstone is thoroughly boiled with water and again sucked off.

Die vereinigten Filtrate «-erden unter Rühren -bis auf etwa 2o0 Raumteile eingedampft und mit q.oo Gewichtsteilen Ätzkali versetzt. Dieses Gemisch wirb unter Rühren erhitzt, bis die Temperatur allmählich auf 21o bis 220' gestiegen ist. Nach einstündigem Rühren bei dieser Temperatur ist die Reaktion beendet. Die Schmelze wird in 4.5o Teilen Wasser gelöst, mit roher Salzsäure kongosauer gemacht und die frei gewordene schweflige Säure durch Kochen ent-; ferne: Auch nach dem Entfernen der schwefligen Säure soll de Lösung kongosauer sein: Beim Erkalten kristallisiert die 5-Oxytrimellitsäüre in großen glänzenden Nadeln, die 2 Mol Kristallwasser enthalten. Getrocknet schmilzt die Säure unter Aufschäumen bei Z4o°. Sie wird zweckmäßig aus etwa g °(oiger Salzsäure umkristallisiert.The combined filtrates "earth, with stirring, up to about 2o0 parts by volume evaporated and treated with q.oo parts by weight of caustic potash. This mixture advertises Stir heated until the temperature has gradually risen to 21o to 220 '. To After stirring for one hour at this temperature, the reaction is complete. The melt is dissolved in 4.5o parts of water, made Congo acidic with crude hydrochloric acid and the freed sulphurous acid is removed by boiling; distant: Also After removing the sulphurous acid, the solution should be Congo acidic: When it cools down 5-oxytrimellitic acid crystallizes in large shiny needles, the 2 moles of water of crystallization contain. When dry, the acid melts with foaming at 40 °. It becomes functional Recrystallized from about g ° (oiger hydrochloric acid.

Claims (1)

PATENTANSPRUCI3: Verfahren zur Darstellung von 5-Oxytrimellitsäure; dadurch gekennzeichnet, daß man Pseudocumol-5-sulfonsäure mit Oxydationsmitteln behandelt und die entstandene Trimellitsäure-5-sulfonsäure in bekannter Weise mit Alkalien auf höhere Temperaturen erhitzt:PATENT CLAIM3: Process for the preparation of 5-oxytrimellitic acid; characterized in that pseudocumene-5-sulfonic acid is treated with oxidizing agents treated and the resulting trimellitic acid-5-sulfonic acid in a known manner with Alkalis heated to higher temperatures:
DE1936I0054131 1936-01-23 1936-01-23 Process for the preparation of 5-oxytrimellitic acid Expired DE686908C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE1936I0054131 DE686908C (en) 1936-01-23 1936-01-23 Process for the preparation of 5-oxytrimellitic acid

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1936I0054131 DE686908C (en) 1936-01-23 1936-01-23 Process for the preparation of 5-oxytrimellitic acid

Publications (1)

Publication Number Publication Date
DE686908C true DE686908C (en) 1940-01-19

Family

ID=7193785

Family Applications (1)

Application Number Title Priority Date Filing Date
DE1936I0054131 Expired DE686908C (en) 1936-01-23 1936-01-23 Process for the preparation of 5-oxytrimellitic acid

Country Status (1)

Country Link
DE (1) DE686908C (en)

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