CH435311A - Process for the synthesis of betaine salts - Google Patents
Process for the synthesis of betaine saltsInfo
- Publication number
- CH435311A CH435311A CH447365A CH447365A CH435311A CH 435311 A CH435311 A CH 435311A CH 447365 A CH447365 A CH 447365A CH 447365 A CH447365 A CH 447365A CH 435311 A CH435311 A CH 435311A
- Authority
- CH
- Switzerland
- Prior art keywords
- acid
- betaine
- synthesis
- trimethylamine
- salts
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C227/00—Preparation of compounds containing amino and carboxyl groups bound to the same carbon skeleton
- C07C227/04—Formation of amino groups in compounds containing carboxyl groups
- C07C227/06—Formation of amino groups in compounds containing carboxyl groups by addition or substitution reactions, without increasing the number of carbon atoms in the carbon skeleton of the acid
- C07C227/08—Formation of amino groups in compounds containing carboxyl groups by addition or substitution reactions, without increasing the number of carbon atoms in the carbon skeleton of the acid by reaction of ammonia or amines with acids containing functional groups
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/41—Preparation of salts of carboxylic acids
- C07C51/412—Preparation of salts of carboxylic acids by conversion of the acids, their salts, esters or anhydrides with the same carboxylic acid part
Landscapes
- 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
Procédé de synthèse de sels de bétâine On sait que la base bétaïne peut se synthétiser à l'aide d'un échangeur d'ions de nature basique, permet tant l'obtention de base bétaïne de grande pureté, au cours d'une seule et simple opération. Les rendements obtenus sont excellents.
Il: a été trouvé maintenant que cette même méthode de synthèse se prête avantageusement non seulement pour la préparation de base bétaïne, mais .aussi pour les sels de cette base ,avec les acides organiques, sans que l'isolation de la base bétaïne soit préalablement nécessaire.
On préparait jusqu'à maintenant des sels semblables soit en mettant en réaction la base bétaïne avec l'acide libre,
soit en faisant réagir le sel de la bétaïne et d'un acide minéral avec le sel alcalin ou alcalino-terreux de l'acide organique en question. La présente invention permet la formation directe du sel de la base bétaïne avec l'acide organique au cours de la synthèse de la bétaïne même, tout en présentant en plus,
l'avantage d'une pureté remarquable et d'un rende ment élevé du produit terminé.
Selon l'invention, de l'acide monochloracétique absorbé sur un échangeur d'ions fortement basique est mis en réaction avec un sol formé de l'acide organique désiré et de triméthylamine,
de préférence en propor tion équimoléculaire. La température sur la colonne contenant l'échangeur d'ions varie de préférence entre 25 et 350 C.
Au cours d'une réaction légèrement exo thermique se forme le sel de bétaïne recherché avec l'acide organique contenu dans. la solution aqueuse sor tant :au bas de la colonne. Le produit isolé de cette solution aqueuse par la méthode usuelle est déjà d'une pureté suffisante sans recristallisation ultérieure.
La réaction donne le sel de bétaïne avec n'importe quel acide organique mis en réaction. selon les indica- fiions susmentionnées,
pour -autant que l'acidité de l'acide en question. ne soit pas plus forte que celle de l'acide monochloracétique.
<I>Exemple</I> On dissout :dans. <B>500</B> ce d'eau distillée 94,5 g (1 M) d'acide monochloracétique. On laisse .réagir cette solu tion avec un échangeur d'ions:
de nature .fortement basi que (par exemple Dowex 21 K) se trouvant dans une colonne d'absorption. La solution quittant la co- lonne doit être neutre. On introduit alors entre 25 et 350 C une solution aqueuse de monocitrate de triméthyl-
amine. Cette solution qui a été préparée par l'introduc tion de 59 g de triméthylamine dans une solution aqueuse de 192 g d'acide citrique clans 1000 cc d'eau distillée doit être introduite très lentement dans la colonne. L'éluat quittant la colonne est une solution de citrate de bétaïne contenant <RTI
ID="0001.0142"> ce produit dans un état pur. Après concentration de la solution aqueuse et dissolu tion de la masse cristalline dans. l'alccol éthylique, on obtient 250 à 275 g de citrate de bétaïne correspon- dant à un rendement de 85 à 90 a/o.
Process for the synthesis of betaine salts It is known that the betaine base can be synthesized using an ion exchanger of a basic nature, allowing both the production of high purity betaine base, during a single and simple operation. The yields obtained are excellent.
It: has now been found that this same synthetic method is advantageously suitable not only for the preparation of a betaine base, but also for the salts of this base, with organic acids, without the isolation of the betaine base having to be done beforehand. necessary.
Similar salts have been prepared until now either by reacting the betaine base with the free acid,
or by reacting the salt of betaine and of a mineral acid with the alkali or alkaline earth salt of the organic acid in question. The present invention allows the direct formation of the salt of the betaine base with the organic acid during the synthesis of the betaine itself, while having in addition,
the advantage of remarkable purity and a high yield of the finished product.
According to the invention, monochloroacetic acid absorbed on a strongly basic ion exchanger is reacted with a sol formed from the desired organic acid and trimethylamine,
preferably in an equimolecular proportion. The temperature on the column containing the ion exchanger preferably varies between 25 and 350 C.
During a slightly exothermic reaction, the desired betaine salt is formed with the organic acid contained in. the aqueous solution exiting: at the bottom of the column. The product isolated from this aqueous solution by the usual method is already of sufficient purity without subsequent recrystallization.
The reaction gives the betaine salt with any organic acid reacted. according to the aforementioned indications,
for -as much as the acidity of the acid in question. is not stronger than that of monochloroacetic acid.
<I> Example </I> We dissolve: in. <B> 500 </B> cc of distilled water 94.5 g (1 M) of monochloroacetic acid. This solution is allowed to react with an ion exchanger:
of strongly basic nature (eg Dowex 21 K) in an absorption column. The solution leaving the column should be neutral. An aqueous solution of trimethyl monocitrate is then introduced between 25 and 350 ° C.
amine. This solution, which has been prepared by introducing 59 g of trimethylamine in an aqueous solution of 192 g of citric acid in 1000 cc of distilled water, must be introduced very slowly into the column. The eluate leaving the column is a betaine citrate solution containing <RTI
ID = "0001.0142"> this product in a pure state. After concentrating the aqueous solution and dissolving the crystalline mass in. ethyl alcohol, 250 to 275 g of betaine citrate are obtained, corresponding to a yield of 85 to 90 a / o.
Claims (1)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH447365A CH435311A (en) | 1965-03-31 | 1965-03-31 | Process for the synthesis of betaine salts |
FR53607A FR1471521A (en) | 1965-03-31 | 1966-03-16 | Process for the synthesis of betaine salts |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH447365A CH435311A (en) | 1965-03-31 | 1965-03-31 | Process for the synthesis of betaine salts |
Publications (1)
Publication Number | Publication Date |
---|---|
CH435311A true CH435311A (en) | 1967-05-15 |
Family
ID=4276743
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH447365A CH435311A (en) | 1965-03-31 | 1965-03-31 | Process for the synthesis of betaine salts |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH435311A (en) |
-
1965
- 1965-03-31 CH CH447365A patent/CH435311A/en unknown
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