CH227349A - Process for the preparation of o-sulfobenzoic acid. - Google Patents
Process for the preparation of o-sulfobenzoic acid.Info
- Publication number
- CH227349A CH227349A CH227349DA CH227349A CH 227349 A CH227349 A CH 227349A CH 227349D A CH227349D A CH 227349DA CH 227349 A CH227349 A CH 227349A
- Authority
- CH
- Switzerland
- Prior art keywords
- preparation
- acid
- copper
- parts
- sulfobenzoic acid
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C303/00—Preparation of esters or amides of sulfuric acids; Preparation of sulfonic acids or of their esters, halides, anhydrides or amides
- C07C303/02—Preparation of esters or amides of sulfuric acids; Preparation of sulfonic acids or of their esters, halides, anhydrides or amides of sulfonic acids or halides thereof
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Description
Verfahren zur Darstellung -von o-Sulfobenzoesäure. Es wurde gefunden, dass sich o-Halogen- benzoesäuren mit Salzen der schwefligen Säure in Gegenwart von Kupfer oder Kupfersalzen zur o-Sulfobenzoesäure umsetzen lassen.
<I>Beispiel:</I> In einem Autoklaven (Inhalt 50 Vol.-Teile) werden 14 Teile o-Chlorbenzoesäure in 14 Tei- len Wasser mit 12 Teilen Natronlauge 30 % gelöst (Reaktion ganz schwach lackmusalka- lisch)
. Dazu gibt man 13 Teile schweflig- saures Natron 94 % oder entsprechende Menge eines andern schwefligen Salzes und 0,135 Teile in 0,4 Teilen Wasser gelöstes Kupfersulfat. Der Autoklav wird nun innerhalb 4 Stunden auf 170-175 0 erwärmt und 10 Stunden bei dieser Temperatur gerührt.
Nach dem Er kalten wird die weisse, breiige Masse in eine 1Tarmite gedrückt, mit 15 Teilen heissem Wasser versetzt und auf zirka 70-800 er- wärmt. Mit 13 Teilen Salzsäure 30 % stellt man deutlich kongosauer und rührt einige Zeit bei 80 0. Dann wird die Lösung einge dampft, wobei von den zuerst sich ausschei- elenden anorganischen Salzen abfiltriert wer den kann.
Falls sich noch etwas unver änderte Chlorbenzoesäure ausscheiden sollte, wird vor dem Eindampfen klarfiltriert.
Ebensogut kann auch die gegen Lackmus neutral gestellte Lösung eingedampft werden. Das Endprodukt wird in Form eines in Wasser leicht löslichen, farblosen Pulvers erhalten; die Ausbeute ist sehr gut.
An Stelle von Kupfersulfat kann auch ein anderes Kupfersalz verwendet werden oder aber Kupfermetall zugesetzt oder die Reaktion in einem kupfernen Gefäss durchgeführt wer den. Genau gleich reagiert die o-Bromben- zoesäure.
Process for the preparation of o-sulfobenzoic acid. It has been found that o-halobenzoic acids can be reacted with salts of sulphurous acid in the presence of copper or copper salts to give o-sulphobenzoic acid.
<I> Example: </I> In an autoclave (content 50 parts by volume) 14 parts of o-chlorobenzoic acid are dissolved in 14 parts of water with 12 parts of sodium hydroxide solution 30% (reaction is very slightly litmus alkaline)
. 13 parts of 94% sulphurous soda or a corresponding amount of another sulphurous salt and 0.135 part of copper sulphate dissolved in 0.4 part of water are added. The autoclave is then heated to 170-175 ° within 4 hours and stirred at this temperature for 10 hours.
After cooling, the white, pulpy mass is pressed into a 1Tarmite, mixed with 15 parts of hot water and heated to around 70-800. 13 parts of 30% hydrochloric acid are used to make Congo acidic and the mixture is stirred at 80 ° for some time. The solution is then evaporated, and the inorganic salts which separate out first can be filtered off.
If some unchanged chlorobenzoic acid should precipitate, it is filtered clear before evaporation.
The litmus neutral solution can be evaporated just as well. The end product is obtained in the form of a colorless powder which is readily soluble in water; the yield is very good.
Instead of copper sulphate, another copper salt can also be used or copper metal can be added or the reaction can be carried out in a copper vessel. The o-bromobenzoic acid reacts in exactly the same way.
Claims (1)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH227349T | 1942-07-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CH227349A true CH227349A (en) | 1943-06-15 |
Family
ID=4455009
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CH227349D CH227349A (en) | 1942-07-25 | 1942-07-25 | Process for the preparation of o-sulfobenzoic acid. |
Country Status (1)
| Country | Link |
|---|---|
| CH (1) | CH227349A (en) |
-
1942
- 1942-07-25 CH CH227349D patent/CH227349A/en unknown
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