AT18984B - Process for the production of methylencitric acid. - Google Patents
Process for the production of methylencitric acid.Info
- Publication number
- AT18984B AT18984B AT18984DA AT18984B AT 18984 B AT18984 B AT 18984B AT 18984D A AT18984D A AT 18984DA AT 18984 B AT18984 B AT 18984B
- Authority
- AT
- Austria
- Prior art keywords
- acid
- methylencitric
- production
- citric acid
- act
- Prior art date
Links
Landscapes
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)
Description
<Desc/Clms Page number 1>
Österreichische
EMI1.1
FARBENFABRIKEN VORM. FRIEDR. BAYER & CO. IN ELBERFELD.
Verfahren zur Herstellung von Methylenzitronensäure.
In dem D. R. P. Nr. 129255 ist ein Verfahren zur Darstellung von Methylenzitronensiture beschrieben, welches darin besteht, dass man Zitronensäure auf Paraformaldehyd bei höheren Temperaturen einwirken lässt. Nach den von uns angestellten Versuchen verläuft dieses Verfahren jedoch nicht quantitativ, vielmehr erhält man danach nur eine Ausbeute von höchstens 50%. In der genannten Patentschrift wird weiter noch erwähnt, dass man auch in der Weise verfahren könne, dass man Formaldehydlösung in Gegenwart von Salzsäure auf Zitronensäure einwirken lässt, dabei soll das Ergebnis, wie ausdrücklich erwähnt wird, #weniger vorteilhaft" sei, als bei der Anwendung von Paraformaldebyd.
Wir haben diese Angabe nachgeprüft und gefunden, dass das Ergebnis dabei in der Tat noch viel weniger vorteilhaft ist. Wir erhielten nämlich nur eine Ausbeute von ungefähr 10%. Es wurde nun gefunden, dass man das genannte therapeutisch sehr wertvoll Produkt in ganz
EMI1.2
Beispiel :
2 kg wasserfreie, fein gepulverte Zitronensäure werden mit 2 I. -g trockenem Chlor- methylalkohol gemischt und im Autoklaven etwa vier Stunden auf 130 bis 1400 erhitzt.
Nach dem Erkalten der Masse wird das Reaktionsprodukt in ungefähr 6 Liter kochendem Wasser gelöst. Aus der so erhaltenen Lösung scheidet sich die Methylenzitronensäure
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augegebenen Eigenschaften.
**WARNUNG** Ende DESC Feld kannt Anfang CLMS uberlappen**.
<Desc / Clms Page number 1>
Austrian
EMI1.1
FARBENFABRIKEN VORM. FRIEDR. BAYER & CO. IN ELBERFELD.
Process for the production of methylencitric acid.
In the D.R.P. No. 129255 a method for the preparation of methylenzitronensiture is described which consists in allowing citric acid to act on paraformaldehyde at higher temperatures. According to the tests we have carried out, however, this process does not proceed quantitatively; rather, only a maximum yield of 50% is obtained. The cited patent also mentions that one can proceed in such a way that formaldehyde solution is allowed to act on citric acid in the presence of hydrochloric acid; the result, as is expressly mentioned, is said to be "less advantageous" than when used by Paraformaldebyd.
We checked this claim and found that the result is in fact much less beneficial. In fact, we only got a yield of about 10%. It has now been found that one can use the said therapeutically very valuable product in its entirety
EMI1.2
Example:
2 kg of anhydrous, finely powdered citric acid are mixed with 2 μg of dry chloromethyl alcohol and heated to 130 to 1400 for about four hours in an autoclave.
After the mass has cooled down, the reaction product is dissolved in approximately 6 liters of boiling water. The methyl citric acid separates from the solution thus obtained
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given properties.
** WARNING ** End of DESC field may overlap beginning of CLMS **.
Claims (1)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1902150949D DE150949C (en) | 1902-10-08 |
Publications (1)
Publication Number | Publication Date |
---|---|
AT18984B true AT18984B (en) | 1905-01-25 |
Family
ID=5674203
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
AT18984D AT18984B (en) | 1902-10-08 | 1903-03-23 | Process for the production of methylencitric acid. |
Country Status (1)
Country | Link |
---|---|
AT (1) | AT18984B (en) |
-
1903
- 1903-03-23 AT AT18984D patent/AT18984B/en active
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