ES361138A1 - Process for producing potassium peroxydiphosphate - Google Patents
Process for producing potassium peroxydiphosphateInfo
- Publication number
- ES361138A1 ES361138A1 ES361138A ES361138A ES361138A1 ES 361138 A1 ES361138 A1 ES 361138A1 ES 361138 A ES361138 A ES 361138A ES 361138 A ES361138 A ES 361138A ES 361138 A1 ES361138 A1 ES 361138A1
- Authority
- ES
- Spain
- Prior art keywords
- anolyte
- catholyte
- potassium
- cell
- anode
- 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
- 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
- C25B1/01—Products
- C25B1/28—Per-compounds
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)
- Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)
Abstract
Potassium peroxydiphosphate (K 4 P 2 O 8 ) is produced electrolytically by introducing an aqueous mixture containing potassium, phosphate and fluoride ions into the anode compartment of an electrolytic cell as the anolyte, the anolyte having a phosphate ion (i.e. PO 4 ---, HPO 4 -- or H 2 PO 4 -) concentration of from 1 to 4 molar, a fluoride ion concentration of 0À5 to 1À25 atoms of fluroide ion for each phosphate ion and a potassium ion concentration sufficient to have at least one potassium ion present for each fluoride ion and in addition from 2 to 3 potassium ions present for each phosphate ion in the anolyte solution, introducing an aqueous mixture containing phosphate ions into the cathode compartment of the electrolytic cell as the catholyte, the catholyte and anolyte of the electrolytic cell being contained by means (preferably diaphragm means) which permit potassium and/or phosphate ions to pass freely between the anolyte and catholyte but which prevent any substantial amounts of peroxydiphosphate values in the anolyte from mixing with the catholyte, passing an electric current through the catholyte and anolyte by means of a cathode in the catholyte and an anode in the anolyte, converting phosphate values to peroxydiphosphate values in the anolyte at a pH of 9À7 to 14À5, removing an anolyte enriched in peroxydiphosphate values from the electrolytic cell, and precipitating and recovering potassium peroxydiphosphate values from the anolyte. The anolyte may be prepared by mixing KOH, H 3 PO 4 and HF in an aqueous solution or may be prepared from KH 2 PO 4 , K 2 HPO 4 , K 3 PO 4 , KHF 2 and KF. The catholyte may be prepared from KOH and H 3 PO 4 or from KH 2 PO 4 or K 2 HPO 4 . A diaphragm between the anolyte and catholyte may comprise any porous membrane such as a porous porcelain sheet, asbestos membrane, plastic membrane or a cation exchange membrane. The anode may be of Pt, Au or Ta reinforced Pt. The cathode may be of Pb, graphite, stainless steel, Pt or Au. Cathodes may be in the form of plates, wire screens or spirals made of hollow tubing through which cooling solution can be passed. Specified electrolysing conditions are:- an e.m.f. of at least 2 volts, a temperature of 10-90 C. and an anode current density of 0À1-1 amp/cm2. The pH may be constantly adjusted throughout the electrolysis by the addition of KOH. The process may be operated batchwise or continuously. In a continuous process, anolyte removed from the cell is passed to an evaporator-crystallizer and, after removing K 4 P 2 O 8 crystals, the mother liquor is mixed with used catholyte and returned to the anode compartment. Fresh catholyte is supplied to the cathode compartment. The process may be performed with solutions passing from cell to cell in series. In the Examples a cell comprises a Pt mesh anode, a stainless steel tubular cathode and a porous ceramic plate diaphragm. A tubular glass coil in the anode compartment is connected with the tubular cathode by rubber tubing. Water is passed through the glass, rubber and stainless steel tubing to maintain the cell temperature constant.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US68852567A | 1967-12-06 | 1967-12-06 |
Publications (1)
Publication Number | Publication Date |
---|---|
ES361138A1 true ES361138A1 (en) | 1970-08-01 |
Family
ID=24764770
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
ES361138A Expired ES361138A1 (en) | 1967-12-06 | 1968-12-06 | Process for producing potassium peroxydiphosphate |
Country Status (10)
Country | Link |
---|---|
US (1) | US3616325A (en) |
BE (1) | BE723930A (en) |
BR (1) | BR6804694D0 (en) |
CH (1) | CH521924A (en) |
DE (1) | DE1809799A1 (en) |
ES (1) | ES361138A1 (en) |
FR (1) | FR1591504A (en) |
GB (1) | GB1236248A (en) |
NL (1) | NL6817444A (en) |
SE (1) | SE340270B (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2434872A1 (en) * | 1978-08-30 | 1980-03-28 | Air Liquide | PROCESS FOR THE PREPARATION OF PEROXYDISULFATE OF ALKALINE METALS AND AMMONIUM |
US4626327A (en) * | 1985-06-06 | 1986-12-02 | Fmc Corporation | Electrolytic process for manufacturing potassium peroxydiphosphate |
US4626326A (en) * | 1985-06-06 | 1986-12-02 | Fmc Corporation | Electrolytic process for manufacturing pure potassium peroxydiphosphate |
US4663002A (en) * | 1985-07-29 | 1987-05-05 | Fmc Corporation | Electrolytic process for manufacturing potassium peroxydiphosphate |
US5262018A (en) * | 1991-08-12 | 1993-11-16 | Fmc Corporation | Metals removal from aqueous peroxy acids or peroxy salts |
KR101215536B1 (en) * | 2009-10-01 | 2012-12-26 | 한국전기연구원 | apparatus for high-field fabrication of anodic nanostructures |
EP2991145A1 (en) * | 2014-08-29 | 2016-03-02 | Clariant International Ltd. | Device for storing electrical energy |
-
1967
- 1967-12-06 US US688525A patent/US3616325A/en not_active Expired - Lifetime
-
1968
- 1968-10-14 GB GB48504/68A patent/GB1236248A/en not_active Expired
- 1968-11-13 FR FR1591504D patent/FR1591504A/fr not_active Expired
- 1968-11-14 BE BE723930D patent/BE723930A/xx unknown
- 1968-11-19 DE DE19681809799 patent/DE1809799A1/en not_active Withdrawn
- 1968-11-21 CH CH1737268A patent/CH521924A/en not_active IP Right Cessation
- 1968-12-05 NL NL6817444A patent/NL6817444A/xx unknown
- 1968-12-06 BR BR204694/68A patent/BR6804694D0/en unknown
- 1968-12-06 ES ES361138A patent/ES361138A1/en not_active Expired
- 1968-12-06 SE SE16718/68A patent/SE340270B/xx unknown
Also Published As
Publication number | Publication date |
---|---|
US3616325A (en) | 1971-10-26 |
BE723930A (en) | 1969-05-14 |
GB1236248A (en) | 1971-06-23 |
SE340270B (en) | 1971-11-15 |
BR6804694D0 (en) | 1973-01-09 |
NL6817444A (en) | 1969-06-10 |
FR1591504A (en) | 1970-04-27 |
DE1809799A1 (en) | 1969-07-03 |
CH521924A (en) | 1972-04-30 |
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