US1817858A - Method of producing alkali metal phosphates by converting ferrophosphorus with alkali metal sulphates - Google Patents
Method of producing alkali metal phosphates by converting ferrophosphorus with alkali metal sulphates Download PDFInfo
- Publication number
- US1817858A US1817858A US379876A US37987629A US1817858A US 1817858 A US1817858 A US 1817858A US 379876 A US379876 A US 379876A US 37987629 A US37987629 A US 37987629A US 1817858 A US1817858 A US 1817858A
- Authority
- US
- United States
- Prior art keywords
- alkali metal
- producing
- ferrophosphorus
- converting
- phosphorus
- 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
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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
- C01B25/305—Preparation from phosphorus-containing compounds by alkaline treatment
Definitions
- Suitable reaction agents are coals or carbonaceous substances, for instance tar or remagnesium compounds and, when this sulphate is used, the addition of the reaction agent will have an additional effect, in that the disturbing effects of such calcium and magnesium compounds will be avoided.
- a method of producing alkali metal phosphate from ferro-phosphorus comprising heating term-phosphorus with an alkali metal sulphate in the presence of a carbonaceous reducing agent in the proportion of approximately one part by weight of ferrophosphorus, approximately two parts by weight of alkali metal sulphate, and approximately .06 part by weight of such reducing agent until reaction takes place, and separating alkali metal phosphate from the resulting product.
- a method of producing potassium phosphate from term-phosphorus comprising heating term-phosphorus with potassium sulphate in the presence of a carbonaceous reducing agent in the proportion of approximately one part by weight of ferro-phosphorus, approximately two parts by weight of potassium sulphate, and approximately .06 part by weight of such reducing agent until reaction takes place, and separating potassium phosphate from the resulting product.
- a method of producing sodium phosphate from term-phosphorus comprising heating term-phosphorus with sodium sulphate in the presence of a carbonaceous reducing agent in the proportion of approximately one part by Weight of ferro-phosphorus approximately two parts by Weight of sodium sulphate, and approximately .06 part by weight of such reducing agent until reaction takes place, and separating sodium phosphate from the resulting product.
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
Description
Patented Aug. 4, 1951 UNITED STATES PATENT OFFICE FRITZ 'ULLMANN AND JOSEPH BRESLAUER, OF GENEVA, AND EGI L LIE, OF GHEVRES, NEAR GENEVA, SWITZERLAND METHOD OF PRODUCING ALKALI METAL PHOSPHATES BY CONVERTING FERROPHOS PHORUS WITH ALKALI METAL SULPHATES No Drawing. Application filed July 20, 1929, Serial No. 379,876, and in Germany July 24, 1928.
" phosphates from phosphoric iron and alkali metal sulphates by heating ferro-phosphorus together with sodium sulphate and drawing out the obtained sodium phosphate by means of water. When working according to the equation:
3 molecules of sodium sulphate are needed to 2 atoms of phosphorus and, when the process is carried out on a practical scale, it is advisable to employ a surplus of 10 to 15 per cent of sodium sulphate.
Investigations carried out in connection with this process have shown that the maximum yield of water soluble substances will amount to 7 2,6 per cent of the amount which may be expected theoretically. Only by the use of double the amount, i. e. six molecules, instead of 3 molecules of alkali metal sulphates (as given in the theoretical equation), is it possible to obtain about 90 per cent of the theoretical yield of water-soluble phosphates.
This excessive quantity of alkali metal sulphates which does not partake in the reaction and which contaminates the end product requires of course a considerable amount of fuel, work et cetera.
It is further a matter of fact, that when commercial potassium sulphate is used, the lime and magnesia contents of the same will exert a disturbing influence, and reduce the yield of water-soluble potassium phosphate.
We have now found, that the conversion of ferro-phosphorus by the theoretical amount of alkali metal sulphates may be carried out when a certain percentage of a reduction agent is added and the mixture is heated to a temperature at which the reaction will take place.
Suitable reaction agents are coals or carbonaceous substances, for instance tar or remagnesium compounds and, when this sulphate is used, the addition of the reaction agent will have an additional effect, in that the disturbing effects of such calcium and magnesium compounds will be avoided.
Emample.2 kg. of commercial potassium sulphate containing 47 per cent of K O, 2,7 6 per cent of CaOandjMgOare heated with 1 kg. of ferrophosphorus and with 0,06 kg. of finely pulverized coal until sintering takes place or the mass is melted, whereupon the mass is cooled rapidly by pouring the same into water.
The yield of water-soluble potassium phosphate, which is removed from the melted mass in known manner, amounts to 95,1 per cent of the theoretically calculated quantity. In the mass described above 3,04 molecules of potassium sulphate are present for each two molecules of phosphorus.
We claim:
1. A method of producing alkali metal phosphate from ferro-phosphorus, comprising heating term-phosphorus with an alkali metal sulphate in the presence of a carbonaceous reducing agent in the proportion of approximately one part by weight of ferrophosphorus, approximately two parts by weight of alkali metal sulphate, and approximately .06 part by weight of such reducing agent until reaction takes place, and separating alkali metal phosphate from the resulting product.
2. A method of producing potassium phosphate from term-phosphorus, comprising heating term-phosphorus with potassium sulphate in the presence of a carbonaceous reducing agent in the proportion of approximately one part by weight of ferro-phosphorus, approximately two parts by weight of potassium sulphate, and approximately .06 part by weight of such reducing agent until reaction takes place, and separating potassium phosphate from the resulting product.
3. A method of producing sodium phosphate from term-phosphorus, comprising heating term-phosphorus with sodium sulphate in the presence of a carbonaceous reducing agent in the proportion of approximately one part by Weight of ferro-phosphorus approximately two parts by Weight of sodium sulphate, and approximately .06 part by weight of such reducing agent until reaction takes place, and separating sodium phosphate from the resulting product.
4. A method of producing alkali metal phosphate according to claim 1 wherein finely pulverized coal is employed as the reducing agent.
5. A method of producing potassium phosphate according to claim 2 wherein finely pulverized coal is employed as the reducing agent.
6. A method of producing sodium phosphate according to claim 3 wherein finely pulverized coal is employed as the reducing agent.
20 In testimony whereof We have hereunto sete chand r- FRITZ ULLMANN. JOSEPH BRESLAUER. EGIL LIE.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE1817858X | 1928-07-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US1817858A true US1817858A (en) | 1931-08-04 |
Family
ID=7744586
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US379876A Expired - Lifetime US1817858A (en) | 1928-07-24 | 1929-07-20 | Method of producing alkali metal phosphates by converting ferrophosphorus with alkali metal sulphates |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US1817858A (en) |
-
1929
- 1929-07-20 US US379876A patent/US1817858A/en not_active Expired - Lifetime
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