AT120932B - Process for the decomposition of salts of rhodanic acid. - Google Patents
Process for the decomposition of salts of rhodanic acid.Info
- Publication number
- AT120932B AT120932B AT120932DA AT120932B AT 120932 B AT120932 B AT 120932B AT 120932D A AT120932D A AT 120932DA AT 120932 B AT120932 B AT 120932B
- Authority
- AT
- Austria
- Prior art keywords
- decomposition
- rhodanammonium
- salts
- acid
- sulfuric acid
- Prior art date
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- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Description
<Desc/Clms Page number 1>
Verfahren zur Zerlegung von Salzen der Rhodanwasserstoffsäure.
Im Stammpatent Nr. 116053 ist ein Verfahren beschrieben, bei dem Rhodanammonium mit schwefliger Säure, Bisulfiten. Sulfit-BisuIfitgemisehen, Thiosulfaten und schwefliger Säure sowie Polythionaten in Sulfat und Schwefel übergeführt werden kann.
Es wurde gefunden, dass eine gleiche Umwandlung des Rhodanammoniums und anderer Rhodansalze in Sulfat und Schwefel auch durch Erhitzen zusammen mit Thiosulfaten und Schwefelsäure durchgeführt werden kann.
Man hat zwar schon versucht, Rhodanammonium durch Erhitzen mit Schwefelsäure oder Ammonium- sulfat zu zerlegen. Diese Arbeitsweise ist aber technisch nicht durchführbar, da die freie Rhodanwasserstoffsäure hiebei alle in Frage kommenden Gefässmaterialen zerstört. Arbeitet man jedoch nach dem vorliegenden Verfahren, so treten diese Übelstände nicht auf.
Von besonderem technischen Wert ist ein derartiges Verfahren dann. wenn beim Arbeiten nach dem Verfahren des Stammpatentes durch Verwendung von schwefeliger Säure. Bisulfit oder Polythionaten im Überschuss freie Schwefelsäure enthaltende Sulfatlösungen gewonnen werden. Man ist in diesem Falle in der Lage, die bei dem Eindampfen der saueren Ammonsulfatlösung zum Zweck der Abscheidung des Ammonsulfates anfallenden mehr oder weniger stark schwefelsauren Mutterlaugen in den Zersetzungprozess zurückzuführen.
Beispiel 1 : Zu einer wässerigen Lösung von 100 kg Rhodanammonium und 389'3 kg Ammoniumthiosulfat werden 1289 kg einer Schwefelsäure von 20% zugegeben und die Lösung in einem säurefest ausgemauerten oder mit gegen schwefelige Säure beständiger Chromnickelstahllegierung ausgefütterten Autoklaven auf etwa 2000 C erhitzt. Nach etwa zwei Stunden ist alles in Ammonsulfat, Schwefel und Kohlendioxyd übergegangen.
Beispiel 2 : Zu einer Lösung von 100 kg Rhodanammonium und 2143 kg Ammoniumthiosulfat in 2500 leg Wasser werden 3220 leg einer Schwefelsäure von 20% zugegeben und die Mischung wie in Beispiel 1 verarbeitet.
PATENT-ANSPRÜCHE :
1. Verfahren zur Zerlegung von Salzen der Rhodanwasserstoffsäure. insbesondere Rhodanammonium nach Stammpatent Nr. 116053, dadurch gekennzeichnet, dass die Zersetzung des Rhodanammoniums mit Schwefelsäure in Gegenwart von Thiosulfat vorgenommen wird.
**WARNUNG** Ende DESC Feld kannt Anfang CLMS uberlappen**.
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Process for the decomposition of salts of hydrofluoric acid.
In parent patent no. 116053 a process is described in which rhodanammonium with sulphurous acid, bisulfites. Sulphite BisuIfitgemisehen, thiosulphates and sulphurous acid and polythionates can be converted into sulphate and sulfur.
It has been found that the same conversion of rhodanammonium and other rhodan salts into sulfate and sulfur can also be carried out by heating together with thiosulfates and sulfuric acid.
Attempts have already been made to decompose rhodanammonium by heating it with sulfuric acid or ammonium sulfate. However, this procedure is technically not feasible, since the free hydrofluoric acid destroys all possible vessel materials. However, if you work according to the present method, these deficiencies do not occur.
Such a process is then of particular technical value. when working according to the method of the parent patent by using sulphurous acid. Sulfate solutions containing bisulfite or polythionates in excess of free sulfuric acid are obtained. In this case, it is possible to return the more or less strongly sulfuric acid mother liquors which arise during the evaporation of the acidic ammonium sulfate solution for the purpose of separating out the ammonium sulfate to the decomposition process.
Example 1: To an aqueous solution of 100 kg of rhodanammonium and 389'3 kg of ammonium thiosulphate, 1289 kg of 20% sulfuric acid are added and the solution is heated to about 2000 ° C. in an autoclave lined with acid-resistant brickwork or a chromium-nickel steel alloy that is resistant to sulfuric acid. After about two hours everything has changed into ammonium sulphate, sulfur and carbon dioxide.
Example 2: To a solution of 100 kg of rhodanammonium and 2143 kg of ammonium thiosulphate in 2500 pieces of water, 3220 pieces of sulfuric acid of 20% are added and the mixture is processed as in Example 1.
PATENT CLAIMS:
1. Process for the decomposition of salts of hydrofluoric acid. in particular rhodanammonium according to parent patent no. 116053, characterized in that the decomposition of the rhodanammonium is carried out with sulfuric acid in the presence of thiosulfate.
** WARNING ** End of DESC field may overlap beginning of CLMS **.
Claims (1)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE116053X | 1928-04-14 |
Publications (1)
Publication Number | Publication Date |
---|---|
AT120932B true AT120932B (en) | 1931-01-26 |
Family
ID=5654540
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
AT116053D AT116053B (en) | 1928-04-14 | 1929-02-12 | Process for converting rhodanammonium into ammonium sulfate and sulfur. |
AT120932D AT120932B (en) | 1928-04-14 | 1929-12-28 | Process for the decomposition of salts of rhodanic acid. |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
AT116053D AT116053B (en) | 1928-04-14 | 1929-02-12 | Process for converting rhodanammonium into ammonium sulfate and sulfur. |
Country Status (1)
Country | Link |
---|---|
AT (2) | AT116053B (en) |
-
1929
- 1929-02-12 AT AT116053D patent/AT116053B/en active
- 1929-12-28 AT AT120932D patent/AT120932B/en active
Also Published As
Publication number | Publication date |
---|---|
AT116053B (en) | 1930-01-25 |
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