DE413377C - Purification of arsenic-containing phosphoric acid - Google Patents

Purification of arsenic-containing phosphoric acid

Info

Publication number
DE413377C
DE413377C DEM84996D DEM0084996D DE413377C DE 413377 C DE413377 C DE 413377C DE M84996 D DEM84996 D DE M84996D DE M0084996 D DEM0084996 D DE M0084996D DE 413377 C DE413377 C DE 413377C
Authority
DE
Germany
Prior art keywords
phosphoric acid
arsenic
purification
containing phosphoric
acid
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
DEM84996D
Other languages
German (de)
Inventor
Dr Horst Maeder
Dr Otto Wolfes
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.)
Merck KGaA
Original Assignee
E Merck 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 E Merck AG filed Critical E Merck AG
Priority to DEM84996D priority Critical patent/DE413377C/en
Application granted granted Critical
Publication of DE413377C publication Critical patent/DE413377C/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B25/00—Phosphorus; Compounds thereof
    • C01B25/16—Oxyacids of phosphorus; Salts thereof
    • C01B25/18—Phosphoric acid
    • C01B25/234—Purification; Stabilisation; Concentration
    • C01B25/237—Selective elimination of impurities
    • C01B25/238—Cationic impurities, e.g. arsenic compounds

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Removal Of Specific Substances (AREA)

Description

Reinigung von arsenhaltiger Phosphorsäure. Bisher reinigte man Phosphorsäure vom Arsen in der Weise, daß man technische Phosphorsäure mit Schwefelwasserstoff behandelte, oder daß man Phosphorsäure auf über zoo' erhitzte. Das erstere Verfahren hat den Nachteil, daß die Phosphorsäure leicht durch Oxydationsprodukte des H=S verunreinigt wird, wogegen beim -zweiten Verfahren das Arsen in sehr fein verteilter Form ausfällt. in der es nur schwierig von der Phosphorsäure getrennt werden kann. Außerdem wird durch Erhitzen ein Teil der Phosphorsäure in wasserärmere Phosphorsäure übergeführt und dadurch der Aufarbeitung Schwierigkeiten bereitet.Purification of arsenic-containing phosphoric acid. Up to now, phosphoric acid has been purified from arsenic in such a way that technical phosphoric acid is combined with hydrogen sulphide treated, or that phosphoric acid was heated to over zoo '. The former method has the disadvantage that phosphoric acid is easily replaced by oxidation products of H = S is contaminated, whereas in the second process the arsenic is very finely divided Form fails. in which it is difficult to separate from the phosphoric acid. In addition, some of the phosphoric acid is converted into less watery phosphoric acid by heating transferred and thereby the work-up difficulties.

Es wurde nun die wichtige Beobachtung gemacht, daß man Phosphorsäure arsenfrei machen kann dadurch, daß man Phosphorsaure mit Phosphorwasserstoff behandelt, wobei das Arsen in Flocken ausfällt, die durch Filtration, Abschleudern u. dgl. leicht von der Phosphorsäure zu trennen sind. Der technische Effekt des Verfahrens liegt darin, daß hierbei das Reinigungsmittel keine Verunreinigung der Phosphorsäure bei der Oxydation herbeiführen kann. Beispiel. 8oprozentige Phosphorsäure bringt man in ein mit mehreren Stutzen versehenes Tongefäß von etwa ioo 1, verdrängt zunächst die Luft durch Kohlensäure und läßt sodann Phosphorwasserstoff durch die Flüssigkeit hindurchstreichen, wobei sich Arsen in braunschwarzen Flocken ausscheidet. Nach Beendigung der Reaktion treibt man den Rest des Phosphorwassers_offes durch Kohlensäure aus, verdünnt auf etwa 6o Prozent Phosphorsäure mit destilliertem Wasser, filtriert die Flüssigkeit und arbeitet sie in üblicher Weise auf.The important observation has now been made that one is phosphoric acid can make arsenic-free by treating phosphoric acid with hydrogen phosphide, the arsenic precipitates in flakes, which by filtration, centrifuging and the like. are easy to separate from the phosphoric acid. The technical effect of the procedure is that the cleaning agent does not contaminate the phosphoric acid can cause oxidation. Example. 8% phosphoric acid brings is displaced first in a clay vessel with a size of about 100 liters, which is provided with several nozzles the air through carbonic acid and then lets phosphine through the liquid rub through it, whereby arsenic separates in brown-black flakes. To At the end of the reaction, the rest of the phosphorous hydrogen is driven through carbonic acid from, diluted to about 6o percent phosphoric acid with distilled water, filtered the liquid and works it up in the usual way.

Claims (1)

PATENT-AxSPRUCH: Verfahren zur Reinigung arsenhaltiger Phosphorsäure, darin bestehend, daß man diese mit Phosphorwasserstöffen behandelt und das hierbei entstehende metallische Arsen in bekannter Weise durch Filtration, Abschleudern u. dgl. entfernt.PATENT-AxSPRUCH: Process for the purification of arsenic-containing phosphoric acid, consisting in treating them with hydrogen phosphate and doing so resulting metallic arsenic in a known manner by filtration, centrifuging and the like removed.
DEM84996D 1924-05-14 1924-05-15 Purification of arsenic-containing phosphoric acid Expired DE413377C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEM84996D DE413377C (en) 1924-05-14 1924-05-15 Purification of arsenic-containing phosphoric acid

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE234122X 1924-05-14
DEM84996D DE413377C (en) 1924-05-14 1924-05-15 Purification of arsenic-containing phosphoric acid

Publications (1)

Publication Number Publication Date
DE413377C true DE413377C (en) 1925-05-05

Family

ID=25765656

Family Applications (1)

Application Number Title Priority Date Filing Date
DEM84996D Expired DE413377C (en) 1924-05-14 1924-05-15 Purification of arsenic-containing phosphoric acid

Country Status (1)

Country Link
DE (1) DE413377C (en)

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