DE418783C - Representation of the arseniates of the alkaline earths - Google Patents

Representation of the arseniates of the alkaline earths

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Publication number
DE418783C
DE418783C DES64990D DES0064990D DE418783C DE 418783 C DE418783 C DE 418783C DE S64990 D DES64990 D DE S64990D DE S0064990 D DES0064990 D DE S0064990D DE 418783 C DE418783 C DE 418783C
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DE
Germany
Prior art keywords
alkaline earths
arseniates
representation
arsenite
gases
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
Application number
DES64990D
Other languages
German (de)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Chimique des Usines du Rhone
Original Assignee
Chimique des Usines du Rhone
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Chimique des Usines du Rhone filed Critical Chimique des Usines du Rhone
Application granted granted Critical
Publication of DE418783C publication Critical patent/DE418783C/en
Expired legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
    • C01G28/00—Compounds of arsenic
    • C01G28/02—Arsenates; Arsenites
    • C01G28/023—Arsenates; Arsenites of ammonium, alkali or alkaline-earth metals or magnesium

Description

Darstellung von Arseniaten der Erdalkalien. Beim weiteren Studium des durch Patent 416136 geschützten Verfahrens zur Darstellung von Arseniaten der Erdalkalien durch Erhitzen der entsprechenden Arsenite in Gegenwart von Sauerstoff in zum mindesten genügender Menge ist erkannt worden, daß die Reaktionsdauer erheblich abgekürzt werden kann durch Erhöhung der Temperatur, ohne d.aß die Eigenschaften des erzeugten Arseniats dabei Sehaden erleiden. Bei 45o` muß man mehrere Stunden erhitzen, um eine vollständige Oxydation zu erzielen, bei 65o" z. B. erhält man dasselbe Resultat in 1o Minuten.Representation of arseniates of the alkaline earths. With further studies of the process for the preparation of arsenates protected by patent 416136 Alkaline earths by heating the corresponding arsenite in the presence of oxygen in at least a sufficient amount, it has been recognized that the reaction time is considerable Can be abbreviated by increasing the temperature, without d.assing the properties of the arsenate produced suffer sehaden. At 45o` you have to spend several hours heat in order to achieve a complete oxidation, at 65o "for example one obtains the same result in 10 minutes.

Die Temperatur kann ohne Nachteil für das Endprodukt bis zur Hellrotglut gesteigert werden.The temperature can go up to bright red without any detriment to the end product can be increased.

Es ist auch gefunden worden, daß das Erhitzen durch das oxydierende Sauerstoffgemic.ch selbst bewirkt werden kann; es ist selbstverständlich, daß auch in diesem Falle der Sauerstoffgehalt und der Gasstrom so stark sein müssen, daß jede Bildung von metallischen Arsen und seines Oxydationsproduktes, der arsenigen Säure, ausgeschlossen ist.It has also been found that the heating by the oxidizing Oxygengemic.ch itself can be effected; it goes without saying that too in this case the oxygen content and the gas flow must be so strong that any formation of metallic arsenic and its oxidation product, the arsenic Acid, is excluded.

Das oxydierende Sauerstoffgemisch kann auch durch Beimengung von Feuergasen erhitzt werden; in diesem Falle muß aber die größte Sorgfalt darauf verwendet werden, daß die Verbrennung dieser Gase vollständig ist, bevor sie mit dem zu oxydierenden Arsenit in Berührung kommen. Denn selbst ein geringer Gehalt an reduzierenden Gasen könnte metallische Arsen in Freiheit setzen trotz der Gegenwart eines erheblichen Sauerstoffüberschusses. Beispiel: Man knetet ,1 Tonnen gelöschten kalk, 2i/4 Tonnen arsenige Säure (As" 03) mit 45oo 1 Wasser; sobald das Kalksalz gebildet ist, gibt man die Masse in einen Drehofen, dessen Inneres durch eine Kohlenstaubfeuerung beheizt wird, mit oder ohne Zugabe von sekundärer Luft.The oxidizing oxygen mixture can also be created by adding fire gases be heated; in this case, however, the greatest care must be taken that the combustion of these gases is complete before they come with the one to be oxidized Arsenite come into contact. Because even a low content of reducing gases could set free metallic arsenic despite the presence of a significant one Excess oxygen. Example: You knead, 1 ton of slaked lime, 2i / 4 tons arsenic acid (As "03) with 45oo 1 water; as soon as the calcium salt is formed, gives the mass is placed in a rotary kiln, the interior of which is heated by a pulverized coal furnace with or without the addition of secondary air.

Man regelt die Heizung und den sekundären Luftzutritt so, daß 1. die Verbrennung der Heizgase vollsLändig ist im Augenblick, wo sie mit dem Arsenit zusammentreffen.The heating and the secondary air admission are regulated in such a way that 1. the Combustion of the hot gases is complete the moment they meet the arsenite.

z. diese Gase noch einen genügenden überschuß von Sauerstoff enthalten, 3. die Gase bei ungefähr 6oo bis 700° mit dem Arsenit zusammentreffen. Das erzeugte Arseniat ist dem nach dem Verfahren des Hauptpatentcs erhaltenen Produkt gleichwertig.z. these gases still contain a sufficient excess of oxygen, 3. The gases meet the arsenite at about 600 to 700 degrees. That Arseniate produced is the product obtained by the process of the main patent equivalent to.

Claims (1)

PATENT-AN-SPRUCH: Ausführungsform des durch Patent 4tGi;fi geschützten Verfahrens zur Darstellung von Arseniaten der Erdalkalien, dadurch gekennzeichnet, daß das Erdalkaliarsenit durch einen Strom von reiner oder mit Heizgasen gemischter Luft auf höhere Temperatur, gegebenenfalls bis zur Hellrotglut, erhitzt wird.PATENT APPLICATION: Embodiment of that protected by patent 4tGi; fi Process for the preparation of arsenates of the alkaline earths, characterized in, that the alkaline earth arsenite by a stream of pure or mixed with heating gases Air is heated to a higher temperature, if necessary to a bright red glow.
DES64990D 1924-01-03 1924-02-06 Representation of the arseniates of the alkaline earths Expired DE418783C (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR418783X 1924-01-03

Publications (1)

Publication Number Publication Date
DE418783C true DE418783C (en) 1925-09-12

Family

ID=8898326

Family Applications (1)

Application Number Title Priority Date Filing Date
DES64990D Expired DE418783C (en) 1924-01-03 1924-02-06 Representation of the arseniates of the alkaline earths

Country Status (1)

Country Link
DE (1) DE418783C (en)

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