US2223929A - Process for electrolytically producing arsenates - Google Patents
Process for electrolytically producing arsenates Download PDFInfo
- Publication number
- US2223929A US2223929A US152415A US15241537A US2223929A US 2223929 A US2223929 A US 2223929A US 152415 A US152415 A US 152415A US 15241537 A US15241537 A US 15241537A US 2223929 A US2223929 A US 2223929A
- Authority
- US
- United States
- Prior art keywords
- arsenates
- electrolytically producing
- arsenate
- sodium
- electrolytically
- 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
- 238000000034 method Methods 0.000 title description 5
- DJHGAFSJWGLOIV-UHFFFAOYSA-K Arsenate3- Chemical class [O-][As]([O-])([O-])=O DJHGAFSJWGLOIV-UHFFFAOYSA-K 0.000 title description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 9
- MHUWZNTUIIFHAS-XPWSMXQVSA-N 9-octadecenoic acid 1-[(phosphonoxy)methyl]-1,2-ethanediyl ester Chemical compound CCCCCCCC\C=C\CCCCCCCC(=O)OCC(COP(O)(O)=O)OC(=O)CCCCCCC\C=C\CCCCCCCC MHUWZNTUIIFHAS-XPWSMXQVSA-N 0.000 description 5
- 229940047047 sodium arsenate Drugs 0.000 description 5
- 238000005868 electrolysis reaction Methods 0.000 description 4
- 235000011121 sodium hydroxide Nutrition 0.000 description 3
- GOLCXWYRSKYTSP-UHFFFAOYSA-N Arsenious Acid Chemical compound O1[As]2O[As]1O2 GOLCXWYRSKYTSP-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- PTLRDCMBXHILCL-UHFFFAOYSA-M sodium arsenite Chemical compound [Na+].[O-][As]=O PTLRDCMBXHILCL-UHFFFAOYSA-M 0.000 description 2
- LPXPTNMVRIOKMN-UHFFFAOYSA-M sodium nitrite Chemical compound [Na+].[O-]N=O LPXPTNMVRIOKMN-UHFFFAOYSA-M 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- DJHGAFSJWGLOIV-UHFFFAOYSA-N Arsenic acid Chemical group O[As](O)(O)=O DJHGAFSJWGLOIV-UHFFFAOYSA-N 0.000 description 1
- 241000233866 Fungi Species 0.000 description 1
- 241000607479 Yersinia pestis Species 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- UWRBYRMOUPAKLM-UHFFFAOYSA-L lead arsenate Chemical compound [Pb+2].O[As]([O-])([O-])=O UWRBYRMOUPAKLM-UHFFFAOYSA-L 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 235000010288 sodium nitrite Nutrition 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B1/00—Electrolytic production of inorganic compounds or non-metals
Definitions
- sodium arsenate alone can be made relatively economically ,by electrolysis.
- Lead arsenate has already been prepared electrolytically, but owing to the power consumption and apparatus difficulties the process does not come into consideration for technical use.
- sodium arsenate is formed by anodic oxidation of sodium arsenite, e. g. on anodes made of nickel sheet. After some time however a layer of solid arsenate forms on theanode which prevents the further electrolysis. It has already been proposed to overcome this difliculty by constructing the anode as a cylinder from which the salt is removed during continuous rotation.
- the catholyte consists of caustic soda solution
- the anolyte consists of an aqueous mixture of arsenious acid and caustic soda or sodium nitrite.
- the anolyte is maintained at an elevated temperature in the anode compartment, which temperature amounts to more than C.
- the solution is continuously conducted in a circuit from the anode compartment into a vessel in which it cools down, when solid sodium arsenate crystallizes out, and is then led back into the anode compartment again. Care must here be taken that the concentrations in the anode compartment remain practically constant by continuous addition of the starting products.
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
Description
Patented Dec. 3, 1940 PROCESS FOR ELECTROLYTICALLY PRODUCING ARSENATES Leo Liiwenstein, Berlin-Wilmersdorf, Germany No Drawing. Application July 7, 1937, Serial No. 152,415. In Germany July 11, 1936 1 Claim. (Cl. 204-86) Of the arsenates used in practice, particularly in agriculture for the destruction of pests, fungi and the like, sodium arsenate alone can be made relatively economically ,by electrolysis. Lead arsenate has already been prepared electrolytically, but owing to the power consumption and apparatus difficulties the process does not come into consideration for technical use.
According to the processes known up to now sodium arsenate is formed by anodic oxidation of sodium arsenite, e. g. on anodes made of nickel sheet. After some time however a layer of solid arsenate forms on theanode which prevents the further electrolysis. It has already been proposed to overcome this difliculty by constructing the anode as a cylinder from which the salt is removed during continuous rotation.
, This means however that the carrying out of the electrolysis is rendered more difiicult.
It has been found that the electrolysis can be so conducted in the following manner that this obstacle is removed in a technically simple and economical manner, the energy yield being still further improved.
Operations are carried out with diaphragms in the known manner. The catholyte consists of caustic soda solution, the anolyte consists of an aqueous mixture of arsenious acid and caustic soda or sodium nitrite. In contradistinction to the manner of working heretofore known the anolyte is maintained at an elevated temperature in the anode compartment, which temperature amounts to more than C. The solution is continuously conducted in a circuit from the anode compartment into a vessel in which it cools down, when solid sodium arsenate crystallizes out, and is then led back into the anode compartment again. Care must here be taken that the concentrations in the anode compartment remain practically constant by continuous addition of the starting products.
It has been found for example that in the 5 case of an anolyte temperature of -53 C., which has been maintained by heating, by circulation in the form described a well crystallized sodium arsenate was obtained on a suction filter which had been inserted into the circuit. The current, yield was 98%. The tension amounted to 2.5 volts, whilst at ordinary temperature with the usual dimensions and proportions for the apparatus and of the electrolyte it was 3.5-3.2 volts. Decrease in the current yield very frequently takes place at raised temperature in anodic oxidation processes. The good yield obtained was not forthwith to be expected.
What I claim is:
2 The process for preparing sodium arsenate 0 which comprises electrolyzing as the anolyte in the anode compartment of an electrolytic diaphragm cell an aqueous mixture of arsenious acid and caustic soda, or sodium arsenite, while 25 LEO LCWENSTEIN. 35
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2223929X | 1936-07-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2223929A true US2223929A (en) | 1940-12-03 |
Family
ID=7990993
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US152415A Expired - Lifetime US2223929A (en) | 1936-07-11 | 1937-07-07 | Process for electrolytically producing arsenates |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US2223929A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2486464A (en) * | 1947-01-08 | 1949-11-01 | Canadian Copper Refiners Ltd | Method of producing sodium selenate |
| US4303487A (en) * | 1978-04-19 | 1981-12-01 | Ppg Industries, Inc. | Production of alkali metal silicate having a high silica to alkali metal oxide ratio |
-
1937
- 1937-07-07 US US152415A patent/US2223929A/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2486464A (en) * | 1947-01-08 | 1949-11-01 | Canadian Copper Refiners Ltd | Method of producing sodium selenate |
| US4303487A (en) * | 1978-04-19 | 1981-12-01 | Ppg Industries, Inc. | Production of alkali metal silicate having a high silica to alkali metal oxide ratio |
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