UST103202I4 - Production of purified strong wet-process phosphoric acid - Google Patents
Production of purified strong wet-process phosphoric acid Download PDFInfo
- Publication number
- UST103202I4 UST103202I4 US06/417,804 US41780482A UST103202I4 US T103202 I4 UST103202 I4 US T103202I4 US 41780482 A US41780482 A US 41780482A US T103202 I4 UST103202 I4 US T103202I4
- Authority
- US
- United States
- Prior art keywords
- percent
- precipitation
- acid
- phosphoric acid
- sif
- 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.)
- Pending
Links
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 title abstract 6
- 229910000147 aluminium phosphate Inorganic materials 0.000 title abstract 3
- 238000004519 manufacturing process Methods 0.000 title abstract 2
- 238000000034 method Methods 0.000 title abstract 2
- 239000002253 acid Substances 0.000 abstract 4
- 238000001556 precipitation Methods 0.000 abstract 4
- VTLYFUHAOXGGBS-UHFFFAOYSA-N Fe3+ Chemical compound [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 abstract 3
- 229910019142 PO4 Inorganic materials 0.000 abstract 3
- 229910004074 SiF6 Inorganic materials 0.000 abstract 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 abstract 3
- 239000011777 magnesium Substances 0.000 abstract 3
- 229910052749 magnesium Inorganic materials 0.000 abstract 3
- 229910052700 potassium Inorganic materials 0.000 abstract 3
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 abstract 2
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 abstract 2
- 229910052782 aluminium Inorganic materials 0.000 abstract 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract 2
- 239000011575 calcium Substances 0.000 abstract 2
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 abstract 2
- 239000003054 catalyst Substances 0.000 abstract 2
- 239000012535 impurity Substances 0.000 abstract 2
- 239000011591 potassium Substances 0.000 abstract 2
- 239000000047 product Substances 0.000 abstract 2
- 229910017344 Fe2 O3 Inorganic materials 0.000 abstract 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 abstract 1
- 238000007792 addition Methods 0.000 abstract 1
- 239000006227 byproduct Substances 0.000 abstract 1
- ZOMBKNNSYQHRCA-UHFFFAOYSA-J calcium sulfate hemihydrate Chemical compound O.[Ca+2].[Ca+2].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O ZOMBKNNSYQHRCA-UHFFFAOYSA-J 0.000 abstract 1
- YYRMJZQKEFZXMX-UHFFFAOYSA-N calcium;phosphoric acid Chemical compound [Ca+2].OP(O)(O)=O.OP(O)(O)=O YYRMJZQKEFZXMX-UHFFFAOYSA-N 0.000 abstract 1
- 239000003599 detergent Substances 0.000 abstract 1
- 239000003337 fertilizer Substances 0.000 abstract 1
- 239000012065 filter cake Substances 0.000 abstract 1
- 230000003301 hydrolyzing effect Effects 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 abstract 1
- 239000010452 phosphate Substances 0.000 abstract 1
- 230000008635 plant growth Effects 0.000 abstract 1
- 239000002244 precipitate Substances 0.000 abstract 1
- 238000004064 recycling Methods 0.000 abstract 1
- 239000002426 superphosphate Substances 0.000 abstract 1
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
-
- 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
- C01B25/22—Preparation by reacting phosphate-containing material with an acid, e.g. wet process
- C01B25/222—Preparation by reacting phosphate-containing material with an acid, e.g. wet process with sulfuric acid, a mixture of acids mainly consisting of sulfuric acid or a mixture of compounds forming it in situ, e.g. a mixture of sulfur dioxide, water and oxygen
- C01B25/223—Preparation by reacting phosphate-containing material with an acid, e.g. wet process with sulfuric acid, a mixture of acids mainly consisting of sulfuric acid or a mixture of compounds forming it in situ, e.g. a mixture of sulfur dioxide, water and oxygen only one form of calcium sulfate being formed
- C01B25/226—Hemihydrate process
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05B—PHOSPHATIC FERTILISERS
- C05B1/00—Superphosphates, i.e. fertilisers produced by reacting rock or bone phosphates with sulfuric or phosphoric acid in such amounts and concentrations as to yield solid products directly
- C05B1/02—Superphosphates
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Fertilizers (AREA)
Abstract
The concentration of impurities in wet-process phosphoric acid limits the usefulness of the acid for the production of fertilizers, feed-grade phosphate and detergents. The aluminum, magnesium, and fluoride impurities are removed with the calcium sulfate hemihydrate filter cake by hydrolyzing and recycling the off-gas scrubber solutions in the presence of a ferric iron catalyst. The aluminum and magnesium are reduced to less than 0.1 percent in the acid product by the precipitation of (Ca,Mg)Al2 F8.2H2 O, which is acid insoluble and suitable for storage with the byproduct calcium sulfate. Ferric iron also serves as a catalyst for the simultaneous precipitation of (Na,K)2 SiF6. Subsequent additions of potassium as, for example, in the teachings of Gilbert (U.S. Pat. No. 3,338,675), can then be applied to obtain a purified phosphoric acid product suitable for most commercial applications. The added potassium serves two purposes in the 40 to 55 percent P2 O5 acid since ferric iron is reduced to 0.25 percent Fe2 O3 by the precipitation of Fe3 KH14 (PO4)8.4H2 O and the SiF6 = is reduced to about 0.2 percent by the precipitation of K2 SiF6. This subsequent precipitate contains about 50 percent P2 O5 and is as effective as superphosphate [Ca(H2 PO4)2.H2 O] in supporting plant growth.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US06/417,804 UST103202I4 (en) | 1982-09-13 | 1982-09-13 | Production of purified strong wet-process phosphoric acid |
| US06/458,403 US4435372A (en) | 1982-09-13 | 1983-01-17 | Production of purified strong wet-process phosphoric acid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US06/417,804 UST103202I4 (en) | 1982-09-13 | 1982-09-13 | Production of purified strong wet-process phosphoric acid |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US06/458,403 Continuation US4435372A (en) | 1982-09-13 | 1983-01-17 | Production of purified strong wet-process phosphoric acid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| UST103202I4 true UST103202I4 (en) | 1983-07-05 |
Family
ID=23655458
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US06/417,804 Pending UST103202I4 (en) | 1982-09-13 | 1982-09-13 | Production of purified strong wet-process phosphoric acid |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | UST103202I4 (en) |
-
1982
- 1982-09-13 US US06/417,804 patent/UST103202I4/en active Pending
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| STCF | Information on status: patent grant |
Free format text: PATENTED CASE |