CH91560A - Process for the preparation of vanillin. - Google Patents
Process for the preparation of vanillin.Info
- Publication number
- CH91560A CH91560A CH91560DA CH91560A CH 91560 A CH91560 A CH 91560A CH 91560D A CH91560D A CH 91560DA CH 91560 A CH91560 A CH 91560A
- Authority
- CH
- Switzerland
- Prior art keywords
- vanillin
- preparation
- guaiacol
- mixture
- product
- Prior art date
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- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Fats And Perfumes (AREA)
Description
Proeédé pour la préparation de la vanilline. La présente invention a pour objet un procédé pour la préparation de la vanilline, selon lequel on traite un mélange de gaïacol et de formaldéhyde par un produit nitrosé.
On peut, par ce procédé, obtenir avec d'excellents rendements,<B>de</B> la vanilline pure, utilisable pour remplacer la vanille. Il peut être mis en #uvre de la manière suivante: On mélange en proportions équiiiiolécu- laires du gaïacol et de la formaldéhyde di luée par de lalcool méthylique ou éthylique.
Puis on ajoute<B>à</B> ce mélange une dissolution alcoolique d'acide chlorhydrique et de la paranitrosodiméthylaniline dans la proportion de une demi-molécule pour une molécule de gaïacol. Le tout est chauffé pendant quelques heures en continuant<B>à y</B> introduire de l'acide chlorhydrique gazeux.
Après 'refroidissement, on neutralise avec de la soude caustique diluée, on sépare l'alcool par distillation et Fon extrait par le benzol oui l'éther la para- amidédiméthylanifine. La dissolution alcaline de la vanilline restante est ensuite acidifiée et la vanilline en est extraite au moyen du benzol ou (le Féther. Cet extrait est distillè pour séparer la vanilline (le son dissolvant,
puis la vanilline est rectifiée par distillation dans le vide et donne enfin par cristallisa- sion dans l'eau des cristaux de point<B>de</B> fu- tion <B>81</B> ". l'ar rapport au gaïacol employé le rendement en produit brut atteint environ 100./d.
Process for the preparation of vanillin. The present invention relates to a process for the preparation of vanillin, according to which a mixture of guaiacol and formaldehyde is treated with a nitrose product.
It is possible, by this process, to obtain with excellent yields, <B> of </B> pure vanillin, which can be used to replace vanilla. It can be implemented in the following manner: The guaiacol and formaldehyde diluted with methyl or ethyl alcohol are mixed in equiiiiolecular proportions.
Then added <B> to </B> this mixture an alcoholic solution of hydrochloric acid and paranitrosodimethylaniline in the proportion of half a molecule for one molecule of guaiacol. The whole is heated for a few hours while continuing <B> to y </B> to introduce gaseous hydrochloric acid.
After cooling, the mixture is neutralized with dilute caustic soda, the alcohol is distilled off and the alcohol is extracted with benzol or para-amidimethylanifine ether. The alkaline solution of the remaining vanillin is then acidified and the vanillin is extracted from it by means of benzol or (the ether. This extract is distilled to separate the vanillin (the dissolving bran,
then the vanillin is rectified by vacuum distillation and finally gives crystals of <B> melting point <B> </B> in water <B> 81 </B> ". with guaiacol employed, the yield of crude product reaches approximately 100./d.
Claims (1)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR91560X | 1919-02-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CH91560A true CH91560A (en) | 1921-11-01 |
Family
ID=8790916
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CH91560D CH91560A (en) | 1919-02-18 | 1920-02-02 | Process for the preparation of vanillin. |
Country Status (1)
| Country | Link |
|---|---|
| CH (1) | CH91560A (en) |
-
1920
- 1920-02-02 CH CH91560D patent/CH91560A/en unknown
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