ES441121A1 - Process and apparatus for the purification of wetprocessed phosphoric acid - Google Patents
Process and apparatus for the purification of wetprocessed phosphoric acidInfo
- Publication number
- ES441121A1 ES441121A1 ES441121A ES441121A ES441121A1 ES 441121 A1 ES441121 A1 ES 441121A1 ES 441121 A ES441121 A ES 441121A ES 441121 A ES441121 A ES 441121A ES 441121 A1 ES441121 A1 ES 441121A1
- Authority
- ES
- Spain
- Prior art keywords
- calcium sulfate
- phosphoric acid
- separated
- suspension
- acid
- 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
- C01B25/18—Phosphoric acid
- C01B25/234—Purification; Stabilisation; Concentration
- C01B25/237—Selective elimination of impurities
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Removal Of Specific Substances (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
Process for purifying crude wet phosphoric acid, containing free sulfuric acid, at elevated temperature, by adding a quantity sufficient for the precipitation of sulfuric acid in the form of calcium sulfate, of a suitable calcium compound, and of calcium sulfate inoculation crystals in the presence of alkali metal, silicic acid and sulfide compounds as well as an adsorption agent for organic impurities, and by separation of the purified phosphoric acid from the solid substances contained in the reaction product, characterized in that firstly, in a reaction zone, the wet phosphoric acid is mixed at temperatures of more than 70 up to 100ºC with the mentioned calcium compound and with calcium sulfate hemihydrated as crystals of inoculation, in the presence of alkali metal compounds, silicic acid and sulphide as well as car Bón active as an adsorption agent, and they are reacted, precipitating sulfuric acid in the form of calcium sulfate hemihydrate with the formation of a slurry, a part of this slurry is returned to the reaction zone, then from the rest The resulting precipitate is separated from the porridge with respect to the purified phosphoric acid, it is suspended to form an aqueous suspension containing 0 to 30% by weight of phosphoric acid, after which the calcium sulfate hemihydrate contained in the suspension is converted, at temperatures between 20 and 70ºC, in calcium sulfate dihydrate, the solid substances in the suspension are separated from the aqueous phase, and then the separated solid substances are removed by washing with water, after which a part the separated aqueous phase and the resulting washing waters are returned to the process to effect the suspension and conversion of the calcium sulfate hemihydrate, and the other part is combined with the obtained purified phosphoric acid. (Machine-translation by Google Translate, not legally binding)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2447390A DE2447390C3 (en) | 1974-10-04 | 1974-10-04 | Process for purifying wet phosphoric acid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| ES441121A1 true ES441121A1 (en) | 1977-03-16 |
Family
ID=5927552
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| ES441121A Expired ES441121A1 (en) | 1974-10-04 | 1975-09-19 | Process and apparatus for the purification of wetprocessed phosphoric acid |
Country Status (21)
| Country | Link |
|---|---|
| JP (1) | JPS5163394A (en) |
| AT (1) | AT358525B (en) |
| BE (1) | BE834003A (en) |
| BR (1) | BR7506423A (en) |
| CA (1) | CA1045339A (en) |
| CH (1) | CH599900A5 (en) |
| DD (1) | DD120417A5 (en) |
| DE (1) | DE2447390C3 (en) |
| DK (1) | DK137229C (en) |
| EG (1) | EG11849A (en) |
| ES (1) | ES441121A1 (en) |
| FI (1) | FI752749A (en) |
| FR (1) | FR2286790A1 (en) |
| GB (1) | GB1524552A (en) |
| IL (1) | IL48236A (en) |
| IT (1) | IT1047666B (en) |
| NL (1) | NL170839C (en) |
| SE (1) | SE401668B (en) |
| SU (1) | SU671716A3 (en) |
| TR (1) | TR19680A (en) |
| ZA (1) | ZA755820B (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2447347A1 (en) * | 1979-01-24 | 1980-08-22 | Rhone Poulenc Ind | PROCESS FOR THE TREATMENT OF AN IMPURE PHOSPHORIC ACID |
| SE418845B (en) | 1979-05-10 | 1981-06-29 | Boliden Ab | PROCEDURE FOR PURIFICATION OF VAT PROCESS PHOSPHORIC ACID |
| DE3134847A1 (en) * | 1981-09-03 | 1983-03-17 | Hoechst Ag, 6000 Frankfurt | "METHOD FOR PRODUCING CADMIUM-FREE RAW PHOSPHORIC ACID" |
| DE3202659A1 (en) * | 1982-01-28 | 1983-08-04 | Hoechst Ag, 6230 Frankfurt | METHOD FOR PURIFYING WET METHOD PHOSPHORIC ACID |
| EP0087065B1 (en) * | 1982-02-12 | 1985-09-25 | Hoechst Aktiengesellschaft | Process for the reduction of the heavy metal content in raw phosphate |
| IL69100A (en) * | 1982-07-21 | 1986-11-30 | Hoechst Ag | Process for removing heavy metal ions and arsenic from wet-processed phosphoric acid |
| DE3325862A1 (en) * | 1983-07-18 | 1985-01-31 | Hoechst Ag, 6230 Frankfurt | METHOD AND DEVICE FOR REMOVING ORGANIC IMPURITIES FROM WET PROCESS PHOSPHORIC ACID |
| DE19703884C2 (en) * | 1997-02-03 | 1999-04-29 | Bk Giulini Chem Gmbh & Co Ohg | Process for purifying wet process phosphoric acid |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1472520A (en) * | 1966-03-23 | 1967-03-10 | Marchon Products Ltd | Phosphoric acid desulfation process |
-
1974
- 1974-10-04 DE DE2447390A patent/DE2447390C3/en not_active Expired
-
1975
- 1975-09-09 GB GB37054/75A patent/GB1524552A/en not_active Expired
- 1975-09-12 ZA ZA00755820A patent/ZA755820B/en unknown
- 1975-09-18 CA CA235,803A patent/CA1045339A/en not_active Expired
- 1975-09-19 ES ES441121A patent/ES441121A1/en not_active Expired
- 1975-09-22 TR TR19680A patent/TR19680A/en unknown
- 1975-09-27 EG EG573/75A patent/EG11849A/en active
- 1975-09-30 BE BE160530A patent/BE834003A/en not_active IP Right Cessation
- 1975-10-01 FI FI752749A patent/FI752749A/fi not_active Application Discontinuation
- 1975-10-01 NL NLAANVRAGE7511568,A patent/NL170839C/en not_active IP Right Cessation
- 1975-10-02 BR BR7506423*A patent/BR7506423A/en unknown
- 1975-10-02 SE SE7511066A patent/SE401668B/en not_active IP Right Cessation
- 1975-10-02 DD DD188691A patent/DD120417A5/xx unknown
- 1975-10-02 SU SU752176256A patent/SU671716A3/en active
- 1975-10-02 AT AT753175A patent/AT358525B/en not_active IP Right Cessation
- 1975-10-02 IT IT51611/75A patent/IT1047666B/en active
- 1975-10-03 DK DK447575A patent/DK137229C/en not_active IP Right Cessation
- 1975-10-03 IL IL48236A patent/IL48236A/en unknown
- 1975-10-03 JP JP50119685A patent/JPS5163394A/en active Granted
- 1975-10-03 FR FR7530417A patent/FR2286790A1/en active Granted
- 1975-10-03 CH CH1287775A patent/CH599900A5/xx not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| ATA753175A (en) | 1980-02-15 |
| DK137229B (en) | 1978-02-06 |
| SE7511066L (en) | 1976-04-05 |
| FI752749A (en) | 1976-04-05 |
| DK447575A (en) | 1976-04-05 |
| IL48236A (en) | 1978-04-30 |
| DD120417A5 (en) | 1976-06-12 |
| NL170839B (en) | 1982-08-02 |
| DE2447390A1 (en) | 1976-04-08 |
| IL48236A0 (en) | 1975-12-31 |
| EG11849A (en) | 1978-06-30 |
| FR2286790B1 (en) | 1979-10-12 |
| ZA755820B (en) | 1976-08-25 |
| FR2286790A1 (en) | 1976-04-30 |
| DK137229C (en) | 1978-07-10 |
| AT358525B (en) | 1980-09-10 |
| DE2447390C3 (en) | 1983-11-17 |
| IT1047666B (en) | 1980-10-20 |
| GB1524552A (en) | 1978-09-13 |
| JPS5163394A (en) | 1976-06-01 |
| DE2447390B2 (en) | 1977-10-20 |
| SU671716A3 (en) | 1979-06-30 |
| JPS537319B2 (en) | 1978-03-16 |
| CH599900A5 (en) | 1978-06-15 |
| BE834003A (en) | 1976-03-30 |
| BR7506423A (en) | 1976-08-10 |
| TR19680A (en) | 1979-10-05 |
| SE401668B (en) | 1978-05-22 |
| NL170839C (en) | 1983-01-03 |
| CA1045339A (en) | 1979-01-02 |
| NL7511568A (en) | 1976-04-06 |
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