US2252281A - Process of decomposing waterinsoluble phosphates - Google Patents
Process of decomposing waterinsoluble phosphates Download PDFInfo
- Publication number
- US2252281A US2252281A US265934A US26593439A US2252281A US 2252281 A US2252281 A US 2252281A US 265934 A US265934 A US 265934A US 26593439 A US26593439 A US 26593439A US 2252281 A US2252281 A US 2252281A
- Authority
- US
- United States
- Prior art keywords
- phosphates
- calcium
- nitrate
- decomposing
- waterinsoluble
- 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 - Lifetime
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
- C01B25/22—Preparation by reacting phosphate-containing material with an acid, e.g. wet process
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/36—Nitrates
- C01F11/38—Preparation with nitric acid or nitrogen oxides
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05B—PHOSPHATIC FERTILISERS
- C05B11/00—Fertilisers produced by wet-treating or leaching raw materials either with acids in such amounts and concentrations as to yield solutions followed by neutralisation, or with alkaline lyes
- C05B11/04—Fertilisers produced by wet-treating or leaching raw materials either with acids in such amounts and concentrations as to yield solutions followed by neutralisation, or with alkaline lyes using mineral acid
- C05B11/06—Fertilisers produced by wet-treating or leaching raw materials either with acids in such amounts and concentrations as to yield solutions followed by neutralisation, or with alkaline lyes using mineral acid using nitric acid (nitrophosphates)
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05C—NITROGENOUS FERTILISERS
- C05C1/00—Ammonium nitrate fertilisers
Definitions
- the present invention relates to a process of decomposing water-insoluble phosphates.
- the calcium nitrate is separated in a specially well crystallised form by adding to the nitric acid, to the crude phosphate or to the mixture of both in which decomposition takes place, an amount of ammonium nitrate and/or potassium nitrate suflicient for the formation of the known calcium-ammonium nitrate or calcium-potassium nitrate double salts. It is especially suitable to maintain a temperature of from about to 25 C. during the decomposition.
- Example 1000 parts of Morocco phosphate are intro- In Germany April 7, 1938 quizzed at a temperature of 21 G. into 2000 parts of 65 per cent nitric acid in which 150 parts of ammonium nitrate are dissolved. While the crude phosphate is still being introduced, there begins the separation of the calcium-ammonium nitrate double salt which is completed a short time after all phosphate has been introduced In this way 1300 parts of well crystallised, readily filterable double salt having a content of 1..- per cent of ammonia-nitrogen are obtained.
- the improvement which comprises adding at any stage of the reaction at least one of the compounds ammonium nitrate and potassium nitrate in an amount sufficient for the formation of at least one of the known double salts calcium-ammonium nitrate and calcium-potassium nitrate, the crystallization of the calcium nitrate thus taking place in the form of at least one of the said double salts.
Description
Patented Aug. 12, 1941 PROCESS OF DECOMPOSING WATER- INSOLUBLE PHOSPHATES Otto Balz, Ludwigshafen-on-the-Rhine,
and
Heinrich Hamacher, Frankenthal, Germany, assignors, by mesne assignments, to Walter H. Duisberg, New York, N. Y.
No Drawing. Application April 4, 1939, Serial No.
1 Claim.
The present invention relates to a process of decomposing water-insoluble phosphates.
In our copending application Ser. No. 213,186 we have disclosed (with a co-inventor) a process according to which crude phosphates can be rapidly decomposed by means of nitric acid even at a ordinary temperature and even in the cold, which is attended with considerable advantage. At the low temperatures and the concentrations used the separation of calcium nitrate takes place during the reaction or immediately thereafter. In this process a temperature not exceeding 25 C. is maintained during the decomposition and the decomposition is efiected with nitric acid of from 55-65 per cent, the temperatures and concentrations being so correlated as to obtain substantial crystallization of the calcium nitrate not later than the completion of the decomposition and at the reaction temperature.
We have now found that in the said process the calcium nitrate is separated in a specially well crystallised form by adding to the nitric acid, to the crude phosphate or to the mixture of both in which decomposition takes place, an amount of ammonium nitrate and/or potassium nitrate suflicient for the formation of the known calcium-ammonium nitrate or calcium-potassium nitrate double salts. It is especially suitable to maintain a temperature of from about to 25 C. during the decomposition.
The following example will further illustrate how the said invention may be carried out in practice, but the invention is not restricted to this example. The parts are by weight.
Example 1000 parts of Morocco phosphate are intro- In Germany April 7, 1938 duced at a temperature of 21 G. into 2000 parts of 65 per cent nitric acid in which 150 parts of ammonium nitrate are dissolved. While the crude phosphate is still being introduced, there begins the separation of the calcium-ammonium nitrate double salt which is completed a short time after all phosphate has been introduced In this way 1300 parts of well crystallised, readily filterable double salt having a content of 1..- per cent of ammonia-nitrogen are obtained.
What we claim is:
In the process of decomposing water-insoluble phosphates with nitric acid in an amount at least sufiicient to convert all the phosphates into calcium nitrate and phosphoric acid, in which process a temperature not exceeding 25 C. is maintained during the decomposition and the decomposition is effected with nitric acid of from to the temperatures and concentrations being so correlated as to obtain substantial crystallization of the calcium nitrate not later than the completion of the decomposition and at the reaction temperature, and the crystallized calcium nitrate is separated from the phosphoric acid containing reaction liquid, the improvement which comprises adding at any stage of the reaction at least one of the compounds ammonium nitrate and potassium nitrate in an amount sufficient for the formation of at least one of the known double salts calcium-ammonium nitrate and calcium-potassium nitrate, the crystallization of the calcium nitrate thus taking place in the form of at least one of the said double salts.
OTTO BALZ. HEINRICH HAMACHER.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2252281X | 1938-04-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2252281A true US2252281A (en) | 1941-08-12 |
Family
ID=7992410
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US265934A Expired - Lifetime US2252281A (en) | 1938-04-07 | 1939-04-04 | Process of decomposing waterinsoluble phosphates |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US2252281A (en) |
| NL (1) | NL50807C (en) |
-
0
- NL NL50807D patent/NL50807C/xx active
-
1939
- 1939-04-04 US US265934A patent/US2252281A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| NL50807C (en) |
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