DE615577C - Purification of di- and trialkali phosphate liquors - Google Patents
Purification of di- and trialkali phosphate liquorsInfo
- Publication number
- DE615577C DE615577C DEC48579D DEC0048579D DE615577C DE 615577 C DE615577 C DE 615577C DE C48579 D DEC48579 D DE C48579D DE C0048579 D DEC0048579 D DE C0048579D DE 615577 C DE615577 C DE 615577C
- Authority
- DE
- Germany
- Prior art keywords
- purification
- liquors
- impurities
- trialkali phosphate
- trialkali
- 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
- 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
- C01B25/26—Phosphates
- C01B25/30—Alkali metal phosphates
- C01B25/308—Methods for converting an alkali metal orthophosphate into another one; Purification; Decolorasing; Dehydrating; Drying
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
Description
Reinigung von Di- und Trialkaliphosphatlaugen Neutralisiert man primäre Alkaliphosphatlaugen mittels Alkalicarbonaten bzw. Ätzalkalien zu Di- bzw. Trialkaliphosphatlaugen, so fallen wohl Calcium-, Magnesium- und Eisenphosphate zum allergrößten Teil aus, indessen bleiben hierbei je nach der gewählten Konzentration noch geringe Mengen dieser Verunreinigungen dem Lösungsgleichgewicht entsprechend zurück. Diese Verunreinigungen schaden zwar weniger, wenn man die Alkaliphosphate daraus durch einen Kristallisationsprozeß gewinnt, da dann diese Verunreinigungen in der Mutterlauge verbleiben. Sie machen sich jedoch äußerst störend bei denjenigen Alkaliphosphaten bemerkbar, die aus solchen Laugen beispielsweise durch Versprühen oder einen sonstigen technischen Salzabscheidungsprozeß gewonnen werden, bei dem keine Mutterlaugen entstehen. Die so hergestellten Salze sind nämlich mißfarben und trübe löslich.Purification of di- and trialkali phosphate liquors are primary neutralized Alkali phosphate liquors using alkali carbonates or caustic alkalis to di- or trialkali phosphate liquors, calcium, magnesium and iron phosphates are likely to precipitate for the most part, however, depending on the concentration chosen, small amounts still remain these impurities back to the solution equilibrium accordingly. These impurities harm less if you get the alkali phosphates from it through a crystallization process wins, since these impurities then remain in the mother liquor. they do however, it is extremely disturbing in the case of those alkali metal phosphates which result from such Lyes, for example, by spraying or another technical salt deposition process are obtained in which no mother liquors are formed. The salts so produced that is, they are discolored and cloudy, and soluble.
Es hat sich nun gezeigt, daß man selbst die höchstkonzentrierten Laugen bis zu einem solchen Grade von diesen Verunreinigungen befreien kann, daß die damit ohne Anfall von Mutterlauge hergestellten Salze auch bei größter Verdünnung vollkommen klar löslich und von weißer Farbe sind, indem man diese Laugen unter erhöhtem Druck, z. B. einem Druck von 5 bis 15 at, erhitzt, wodurch alle restlichen Verunreinigungen weitgehend ausgefällt werden, so daß sie in einfacher Weise abgetrennt werden können.It has now been shown that you can even use the most concentrated alkalis to such an extent that it can rid itself of these impurities Salts produced without the occurrence of mother liquor are perfect, even at the greatest dilution are clearly soluble and are white in color, if these alkalis under increased pressure, z. B. a pressure of 5 to 15 at, heated, eliminating any remaining impurities are largely precipitated so that they can be separated in a simple manner.
Im wesentlichen bedingt etwa vorhandenes Eisen die Mißfärbung der ohne Abscheidung von Mutterlauge gewonnenen Alkaliphosphate und die Trübung ihrer Lösungen; der Grad seiner Abscheidung ist demnach für den Erfolg des Verfahrens ausschlaggebend.Any iron present essentially causes the discoloration of the alkali phosphates obtained without separation of mother liquor and the turbidity of their Solutions; the degree of its deposition is therefore essential for the success of the procedure decisive.
So wurde beispielsweise eine vierfach normale Dinatriumphosphatlauge, die auf i Million Teile P205 u. a. I ioo Teile Eisen gelöst enthielt, durch Erhitzen auf 5 bzw. i i at Druck so weit von Verunreinigungen befreit, daß nur noch 14o bzw. 9o Teile Eisen auf i Million Teile P.05 darin enthalten waren. Die aus derart gereinigter Lauge ohne Anfall von Mutterlauge gewonnenen Salze waren von rein weißer Farbe und ergaben vollkommen klare Lösungen bei beliebig großer Verdünnung, auch nach Zusatz von Natronlauge.Thus, for example, a four times normal Dinatriumphosphatlauge containing dissolved on i million parts of P205 among others I ioo parts iron by heating at 5 or ii at pressure to the impurities free, that only 14o and 9o parts of iron on i million parts P.05 were included. The salts obtained from lye purified in this way without accumulation of mother liquor were of a pure white color and gave completely clear solutions with any degree of dilution, even after the addition of sodium hydroxide solution.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEC48579D DE615577C (en) | 1933-12-03 | 1933-12-03 | Purification of di- and trialkali phosphate liquors |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEC48579D DE615577C (en) | 1933-12-03 | 1933-12-03 | Purification of di- and trialkali phosphate liquors |
Publications (1)
Publication Number | Publication Date |
---|---|
DE615577C true DE615577C (en) | 1935-07-08 |
Family
ID=7026789
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEC48579D Expired DE615577C (en) | 1933-12-03 | 1933-12-03 | Purification of di- and trialkali phosphate liquors |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE615577C (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1106739B (en) * | 1958-12-27 | 1961-05-18 | Dr Hans Huber | Process for the purification of crude phosphoric acid produced by the wet process |
DE1145149B (en) * | 1960-11-28 | 1963-03-14 | Hans Huber Dr | Process for the production of disodium phosphate |
-
1933
- 1933-12-03 DE DEC48579D patent/DE615577C/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1106739B (en) * | 1958-12-27 | 1961-05-18 | Dr Hans Huber | Process for the purification of crude phosphoric acid produced by the wet process |
DE1145149B (en) * | 1960-11-28 | 1963-03-14 | Hans Huber Dr | Process for the production of disodium phosphate |
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