GB1210694A - Phosphoric acid purification - Google Patents
Phosphoric acid purificationInfo
- Publication number
- GB1210694A GB1210694A GB836368A GB836368A GB1210694A GB 1210694 A GB1210694 A GB 1210694A GB 836368 A GB836368 A GB 836368A GB 836368 A GB836368 A GB 836368A GB 1210694 A GB1210694 A GB 1210694A
- Authority
- GB
- United Kingdom
- Prior art keywords
- phosphoric acid
- precipitate
- hydrogen fluoride
- calcium
- fluorides
- 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)
Abstract
1,210,694. Phosphoric acid purification; hydrogen fluoride. FMC CORP. 21 Feb., 1968, No. 8363/68. Heading C1A. Phosphoric acid, obtained by acidulation of a phosphate rock with sulphuric acid, and having a concentration of 10-30%, by wt. P 2 O 5 , is purified by:-(a) adjusting the calcium ion concentration to 0À25-3À0% by wt. CaO, by addition of a calcium compound whose anion does not remain in, or contaminate, the solution; (b) adding enough hydrogen fluoride to convert all the cationic impurities Ca, Al, Mg and Fe to their fluorides, to precipitate calcium fluoride and to co-precipitate the cationic impurities as their fluorides; (c) separating the precipitate; and (d) recovering phosphoric acid, the pH being maintained below 2 during reaction. Calcium ions may be added as calcium carbonate. Hydrogen fluoride may be added as a 5-15% aqueous 'solution, and, generally, amounts of HF of up to about 5% are required Addition of HF, and the subsequent precipitation can be carried out at from 0‹ to 100‹ C. The pH is preferably 1À5. Hydrogen fluoride may be regenerated by reacting the precipitate obtained with silicon dioxide and steam in a reaction zone at temperatures of 1000‹-1400‹ C. The recovered HF may be recycled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB836368A GB1210694A (en) | 1968-02-21 | 1968-02-21 | Phosphoric acid purification |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB836368A GB1210694A (en) | 1968-02-21 | 1968-02-21 | Phosphoric acid purification |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1210694A true GB1210694A (en) | 1970-10-28 |
Family
ID=9851104
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB836368A Expired GB1210694A (en) | 1968-02-21 | 1968-02-21 | Phosphoric acid purification |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1210694A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2167737A (en) * | 1983-08-03 | 1986-06-04 | Negev Phosphates Ltd | Purified phosphoric acid |
| CN113620267A (en) * | 2021-08-31 | 2021-11-09 | 宜都兴发化工有限公司 | Method for removing sesquioxide in sulfuric acid process wet-process phosphoric acid solution by precipitation method |
-
1968
- 1968-02-21 GB GB836368A patent/GB1210694A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2167737A (en) * | 1983-08-03 | 1986-06-04 | Negev Phosphates Ltd | Purified phosphoric acid |
| CN113620267A (en) * | 2021-08-31 | 2021-11-09 | 宜都兴发化工有限公司 | Method for removing sesquioxide in sulfuric acid process wet-process phosphoric acid solution by precipitation method |
| CN113620267B (en) * | 2021-08-31 | 2024-07-05 | 宜都兴发化工有限公司 | Method for removing sesquioxide in sulfuric acid method wet phosphoric acid solution by precipitation method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PLNP | Patent lapsed through nonpayment of renewal fees |