DE766205C - Process for the production of water-soluble aromatic carboxylic acids - Google Patents
Process for the production of water-soluble aromatic carboxylic acidsInfo
- Publication number
- DE766205C DE766205C DEJ69004D DEJ0069004D DE766205C DE 766205 C DE766205 C DE 766205C DE J69004 D DEJ69004 D DE J69004D DE J0069004 D DEJ0069004 D DE J0069004D DE 766205 C DE766205 C DE 766205C
- Authority
- DE
- Germany
- Prior art keywords
- water
- carboxylic acids
- production
- aromatic carboxylic
- soluble aromatic
- 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
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/16—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation
- C07C51/27—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with oxides of nitrogen or nitrogen-containing mineral acids
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Description
Verfahren zur Herstellung .von wasserlöslichen aromatischen Carbonsäuren Gegenstand des Hauptpatents 743 225 ist ein Verfahren zur Herstellung von Carbonsäuren aus Kohlen, Koks und K ohleextrakben durch Behandlung der Ausgangsstoffe in saurem Medium, dessen Merkmal darin besteht, daß die Ausgangsstoffe mit Salpetersäure in einer Konzentration zwischen z und 15 n, wobei die Konzentration der Säure um so höher zu wählen ist, je höher der Inkohlungsgrad des Ausgangsstoffes ist, in der Wärme derart behandelt werden, daß die jeweils. in Lösung gegangenen Produkte der weiteren Einwirkung der Salpetersäure entzogen. werden, bis die Ausgangsstoffe praktiGch völlig in Lösung gegangen sind.Process for the production of water-soluble aromatic carboxylic acids The subject of the main patent 743 225 is a process for the production of carboxylic acids from coals, coke and coal extracts by treating the starting materials in acid Medium whose characteristic is that the starting materials with nitric acid in a concentration between z and 15 n, the concentration of the acid being so The higher to be selected, the higher the degree of coalification of the starting material in which Heat treated in such a way that each. dissolved products of the further exposure to nitric acid withdrawn. until the starting materials are practical have gone completely into solution.
Dieses Verfahren ermöglicht einen praktisch, völligen Aufschluß der Ausgangsstoffe und deren Überführung in wasserlösliche rniedrigmolekulare cyclische Carbonsäuren.This method enables practically complete exposure of the Starting materials and their conversion into water-soluble, low-molecular cyclic Carboxylic acids.
Die Erfindung betrifft eine Verbesserung des Verfahrens nach dem Hauptpatent und bezweckt, den Verlauf des AufschlußvoTganges zu beschleunigen.The invention relates to an improvement of the method according to the main patent and aims to accelerate the course of the exploration process.
Dieser Erfolg, verbunden mit dem gleichzeitigen, Vorteil, daß die Konzentration der Salpetersäure während des. ganzen Aufschlußvorganges praktisch konstant bleibt, wird dadurch erzielt, daß die Oxydation mit Salpetersäure unter gleichzeitiger Mitverwendung von Sauerstoff oder molekularen Sauerstoff enthaltenden Gasgemischen ausgeführt wird. Hierdurch wird. bewirkt, daß die Salpetersäure lediglich die- Rolle eines Sauerstoffüberträgers spielt, indem das bei dem Oxydationsvorgang entstandene Stickoxvd unmittelbar wieder in höhere Stickoxyde üb°rgefülirt wird, die in Gegenwart von Wasser Salpetersäure ergeben.This success, combined with the simultaneous advantage that the Concentration of nitric acid during the whole digestion process practically remains constant, is achieved by the fact that the oxidation with nitric acid under simultaneous use of oxygen or containing molecular oxygen Gas mixtures is carried out. This will. causes the nitric acid only plays the role of an oxygen carrier by being involved in the oxidation process the resulting nitrogen oxide is immediately transferred back to higher nitrogen oxides, which give nitric acid in the presence of water.
Dadurch, daß die Oxydation gleichzeitig mit dem Kohlenaufschluß vor sich geht, wird die zersetzte Salpetersäure ständig regeneriert, und die Konzentration der Säure bleibt pralztisch konstant.Because the oxidation occurs at the same time as the coal decomposition goes, the decomposed nitric acid is constantly regenerated, and the concentration the acid remains constant pralztisch.
In der einfachsten Weise wird das Verfahren unter Durchleiten von Luft durch die Realtionsflüssiglceit ausgeführt.In the simplest way, the procedure is carried out by passing through Air is carried through the Realtionsiquidiglceit.
Nachstehend wird ein Ausführungsbeispiel des Verfahrens gegeben: r kg Fetthohle wurde in 4 1 ; ii-Salpetersäure unter Durchblasen von Luft unter Rückfluß gekocht. 1 ach Jeweils 3 Stunden wurde die Lösung abgehebert und die Säure wieder aufgefüllt. Nach sechsmaliger Wiederholung dieses Prozesses war der Aufschluß praktisch beendet.An embodiment of the method is given below: r kg fat hollow was in 4 1; ii-nitric acid with refluxing air cooked. After every 3 hours, the solution was siphoned off and the acid again filled up. After repeating this process six times, digestion was practical completed.
ach dem Eindampfen der abgeheberten Lösung verblieben r,oS kg wasserlösliche Carbonsäuren. Die durch Destillation wiedergewonnene Salpetersäure «-ar weder in ihrer Konzentration noch Menge verändert.After evaporation of the siphoned-off solution, r, oS kg of water-soluble remains Carboxylic acids. The nitric acid recovered by distillation was neither in their concentration still changed amount.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEJ69004D DE766205C (en) | 1941-02-26 | 1941-02-26 | Process for the production of water-soluble aromatic carboxylic acids |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEJ69004D DE766205C (en) | 1941-02-26 | 1941-02-26 | Process for the production of water-soluble aromatic carboxylic acids |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE766205C true DE766205C (en) | 1952-11-04 |
Family
ID=7208102
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DEJ69004D Expired DE766205C (en) | 1941-02-26 | 1941-02-26 | Process for the production of water-soluble aromatic carboxylic acids |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE766205C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1107666B (en) * | 1954-12-23 | 1961-05-31 | Robert Valentine Heinze | Process for the partial oxidative degradation of lignite |
-
1941
- 1941-02-26 DE DEJ69004D patent/DE766205C/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1107666B (en) * | 1954-12-23 | 1961-05-31 | Robert Valentine Heinze | Process for the partial oxidative degradation of lignite |
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