DE841452C - Process for the production of alkaline earth-alkali chromates - Google Patents

Process for the production of alkaline earth-alkali chromates

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Publication number
DE841452C
DE841452C DEF2430A DEF0002430A DE841452C DE 841452 C DE841452 C DE 841452C DE F2430 A DEF2430 A DE F2430A DE F0002430 A DEF0002430 A DE F0002430A DE 841452 C DE841452 C DE 841452C
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DE
Germany
Prior art keywords
alkaline earth
alkali
production
oxide
produced
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
DEF2430A
Other languages
German (de)
Inventor
Friedrich Dr Schubert
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.)
Bayer AG
Original Assignee
Bayer AG
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 Bayer AG filed Critical Bayer AG
Priority to DEF2430A priority Critical patent/DE841452C/en
Application granted granted Critical
Publication of DE841452C publication Critical patent/DE841452C/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
    • C01G37/00—Compounds of chromium
    • C01G37/14—Chromates; Bichromates

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Inorganic Compounds Of Heavy Metals (AREA)

Description

Verfahren zur Herstellung von Erdalkali-Alkali-Chromaten Erdalkall-Alkall-Chromate werden nach dem älteren Schrifttum in wäBriger Lösung aus den Komponenten hergestellt. Da die Erdalkali-Alkali-Chromate sich mit Wasser zersetzen, lassen sich auf diesem Wege nur sehr schwer reine Doppelsalze herstellen, obendrein fällt das .Endprodukt in sehr schlechter Ausbeute an.Process for the production of alkaline earth-alkali chromates. Alkaline earth-alkali chromates According to the older literature, they are produced from the components in an aqueous solution. Since the alkaline earth-alkali chromates decompose with water, they can be used on this It is very difficult to produce pure double salts, and the end product falls on top of that in very poor yield.

Das neuere Verfahren, äquivalente Mischungen von Erdalkalicarbonat und Alkalibichromat auf hohe Temperaturen bis zu 70o° zu erhitzen, geht von der Annahme aus, daß die Bildung der Doppelsalze aus den Feststoffen nur bei hohen Temperaturen mit technisch tragbarer Reaktionsgeschwindigkeit in befriedigender Ausbeute vor sich geht.The newer method, equivalent mixtures of alkaline earth carbonate and to heat alkali dichromate to high temperatures of up to 70o °, goes from the Assumption that the formation of the double salts from the solids only at high temperatures with a technically acceptable reaction rate in a satisfactory yield is going.

Gegenstand der Erfindung ist ein Verfahren zur Herstellung von Erdalkali-Alkali-Chromaten, das darin besteht, daß eine Reaktionsmischung, die Chromsäure, Erdalkalioxyd und Al'kalioxyd, vorzugsweise im Verhältnis 2 : i : i enthält, mit Wasser angepastet und getrocknet wird. Vorteilhaft wird die Trocknung bei Temperaturen zwischen etwa 25 und etwa 300° durchgeführt. Die Reaktionsmischung kann z. B. durch Mischen von Erdalkalioxyd, -hydroxyd oder -carbonat mit Alkalibichromat hergestellt werden oder andererseits durch Mischen von Alkalioxyd, -hydroxydoder-carbonatmitErdalkalibichromat. Bei dem neuen Verfahren entstehen die gewünschten Doppelsalze in praktisch quantitativer Ausbeute. Bei der Verwendung von Carbonaten als Umsetzungsteilnehmern wird schon bei Zimmertemperatur die Kohlensäure durch das sauer reagierende Bichromat ausgetrieben,. und das reaktionsfähige naszierende Oxyd tritt sofort in das Bich'romatmolekül unter Bildung des Doppelsalzes ein. Durch röntgenspektralanalytische Verfolgung des Bildungsprozesses läBt sich die Umsetzung der Ausgangsprodukte zum Doppelsalz verfolgen. Es ist auch möglich, an Stelle von Bichromat ein Bichromatbildungsgemisch zu verwenden, d. h. Chromsäure mit Alkalioxyd, -hydroxyd oder -carbonat umzusetzen.The invention relates to a process for the production of alkaline earth-alkali chromates, that consists in a reaction mixture containing chromic acid, alkaline earth oxide and Alkaline oxide, preferably in a ratio of 2: i: i, made into a paste with water and is dried. Drying at temperatures between about 25 and about 300 °. The reaction mixture can e.g. B. by mixing Alkaline earth oxide, hydroxide or carbonate are produced with alkali dichromate or on the other hand by mixing alkali oxide, hydroxide or carbonate with alkaline earth bichromate. With the new process, the desired double salts are produced in a practically quantitative manner Yield. When using carbonates as participants in the implementation, it is already at room temperature the carbonic acid is driven out by the acidic reacting bichromate. and the responsive Nascent oxide immediately enters the bichromate molecule with the formation of the double salt. By X-ray spectral tracking of the formation process, the conversion of the starting products to the double salt can be achieved follow. It is also possible to use a bichromate formation mixture instead of bichromate to use, d. H. To react chromic acid with alkali oxide, hydroxide or carbonate.

Claims (4)

PATENTANSPRÜCHE: i. Verfahren zur Herstellung von Erdalkali-Alkali-Chromaten, dadurch gekennzeichnet, däB eine Reaktionsmischung, die Chromsäure, Erdalkalioxyd und Alkalioxyd, vorzugsweise im ' i Verhältnis 2 : i : i enthält, mit Wässer angepastet und getrocknet wird. PATENT CLAIMS: i. Process for the production of alkaline earth-alkali chromates, characterized in that a reaction mixture which contains chromic acid, alkaline earth oxide and alkali oxide, preferably in a ratio of 2: 1: 1, is made into a paste with water and dried. 2. Verfahren nach Anspruch i, dadurch gekennzeichnet, daß die Trocknung bei Temperaturen zwischen etwa 25 und etwa 3oo° erfolgt. 2. The method according to claim i, characterized in that the Drying takes place at temperatures between about 25 and about 300 °. 3. Verfahren nach Anspruch i und 2, dadurch gekennzeichnet, daB die Reaktionsmischung durch Mischen von Erdalkalioxyd-, -hydroxyd oder -carbonat mit Alkalibicliromat hergestellt wird. 3. Procedure according to claim 1 and 2, characterized in that the reaction mixture is produced by mixing of alkaline earth oxide, hydroxide or carbonate is produced with Alkalibicliromat. 4. Verfahren nach Anspruch i und 2, dadurch gekennzeichnet, daB die Reaktionsmischung durch Mischen von Alkalioxyd, -hydroxyd oder -carbonat , mit Erdalkalibichromat hergestellt wnrd.4. The method according to claim i and 2, characterized in that the reaction mixture by mixing alkali oxide, hydroxide or carbonate with alkaline earth dichromate produced wnrd.
DEF2430A 1950-08-17 1950-08-17 Process for the production of alkaline earth-alkali chromates Expired DE841452C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEF2430A DE841452C (en) 1950-08-17 1950-08-17 Process for the production of alkaline earth-alkali chromates

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEF2430A DE841452C (en) 1950-08-17 1950-08-17 Process for the production of alkaline earth-alkali chromates

Publications (1)

Publication Number Publication Date
DE841452C true DE841452C (en) 1952-06-16

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Family Applications (1)

Application Number Title Priority Date Filing Date
DEF2430A Expired DE841452C (en) 1950-08-17 1950-08-17 Process for the production of alkaline earth-alkali chromates

Country Status (1)

Country Link
DE (1) DE841452C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1592894B1 (en) * 1966-03-24 1971-02-25 Inst Chemii Nieorganicznej Process for the production of barium potassium chromate pigment

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1592894B1 (en) * 1966-03-24 1971-02-25 Inst Chemii Nieorganicznej Process for the production of barium potassium chromate pigment

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