US2337491A - Process of producing sodium acid pyrophosphate - Google Patents
Process of producing sodium acid pyrophosphate Download PDFInfo
- Publication number
- US2337491A US2337491A US356834A US35683440A US2337491A US 2337491 A US2337491 A US 2337491A US 356834 A US356834 A US 356834A US 35683440 A US35683440 A US 35683440A US 2337491 A US2337491 A US 2337491A
- Authority
- US
- United States
- Prior art keywords
- sodium acid
- pyrophosphate
- acid pyrophosphate
- product
- producing sodium
- 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
- 235000019820 disodium diphosphate Nutrition 0.000 title description 8
- GYQBBRRVRKFJRG-UHFFFAOYSA-L disodium pyrophosphate Chemical compound [Na+].[Na+].OP([O-])(=O)OP(O)([O-])=O GYQBBRRVRKFJRG-UHFFFAOYSA-L 0.000 title description 8
- 238000000034 method Methods 0.000 title description 7
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 15
- 239000000047 product Substances 0.000 description 10
- 150000003839 salts Chemical class 0.000 description 10
- AJPJDKMHJJGVTQ-UHFFFAOYSA-M sodium dihydrogen phosphate Chemical compound [Na+].OP(O)([O-])=O AJPJDKMHJJGVTQ-UHFFFAOYSA-M 0.000 description 9
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 8
- FQENQNTWSFEDLI-UHFFFAOYSA-J sodium diphosphate Chemical compound [Na+].[Na+].[Na+].[Na+].[O-]P([O-])(=O)OP([O-])([O-])=O FQENQNTWSFEDLI-UHFFFAOYSA-J 0.000 description 7
- 235000019818 tetrasodium diphosphate Nutrition 0.000 description 7
- 229910000403 monosodium phosphate Inorganic materials 0.000 description 6
- 235000019799 monosodium phosphate Nutrition 0.000 description 6
- 239000001488 sodium phosphate Substances 0.000 description 6
- 239000002253 acid Substances 0.000 description 5
- 238000001035 drying Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 235000010855 food raising agent Nutrition 0.000 description 3
- 235000019980 sodium acid phosphate Nutrition 0.000 description 3
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 239000012467 final product Substances 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000006069 physical mixture Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- -1 Na2H2P2O72NaH2PO4 Substances 0.000 description 1
- 241001246312 Otis Species 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- QPXWUAQRJLSJRT-UHFFFAOYSA-N diethoxyphosphinothioyl diethyl phosphate Chemical compound CCOP(=O)(OCC)OP(=S)(OCC)OCC QPXWUAQRJLSJRT-UHFFFAOYSA-N 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 150000003016 phosphoric acids Chemical class 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 229910000162 sodium phosphate Inorganic materials 0.000 description 1
- 229940048086 sodium pyrophosphate Drugs 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A21—BAKING; EDIBLE DOUGHS
- A21D—TREATMENT OF FLOUR OR DOUGH FOR BAKING, e.g. BY ADDITION OF MATERIALS; BAKING; BAKERY PRODUCTS
- A21D2/00—Treatment of flour or dough by adding materials thereto before or during baking
- A21D2/02—Treatment of flour or dough by adding materials thereto before or during baking by adding inorganic substances
-
- 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
- C01B25/26—Phosphates
- C01B25/38—Condensed phosphates
- C01B25/42—Pyrophosphates
- C01B25/425—Pyrophosphates of alkali metals
Definitions
- This invention relates to the production of pyrophos'phates that are particularly suitable, for example, for leavening agents or baking powders.
- sodium acid pyrophosphate, NazHzPaOr, or a double salt of sodium acid pyrophosphate-monosodium phosphate, Na2H2P2O72NaH2PO4, or a physical mixture of the two salts is produced. It is immaterial in carrying out the process whether the result is a double salt or a physical mixture of the two salts.
- corrosive-proof containers such as stainless steel are needed. It is difficult to dry the product to prevent it from melting or fusing. The mixture becomes very sticky at elevated temperatures and is inconvenient to stir or handle. Also, when stored it cakes into a very hard solid lump in a few days.
- Example I Tetrasodium pyrophosphate of any fineness, finely ground being preferred, is reacted with phosphoric acid, at room temperature, with the heat of reaction being all that is required to complete the reaction, using one mol of the former to two mols of the latter:
- the physical condition of the double salt (or mixed salts) will be dependent on the strength of phosphoric acid used, but in all cases some drying, at less than the temperature required to convert monosodium phosphate into sodium acid pyrophosphate, is required so that the final product will be in such physical condition as to permit grinding into a powder.
- the preferred drying temperature is near that of boiling water, 212 F. Any of the condition.
- the product can be kept agitated .for about 20 minutes, to prevent setting as a mass. It will then be in such physical condition as to permit grinding in a swinghammer mill, for example, and subsequently screened to minus 6 mesh.
- This 6 mesh product can then be introduced into a rotary dryer and heated to a temperature of about 212 F. for 20 minutes, and discharged from the dryer in'the physical desired
- This product, the double salt (or mixed salts) of NazHaPaOmZNaI-IzPO-r has a Slight tendency to be hygroscopic after final drying, but not nearly so much as monosodium phosphate alone. This hygroscopic tendency can be taken care of in the usual ways, for instance, by coating with starch. Or it can be marketed as such, notwithstanding its tendency to be slightly hygroscopic.
- Example II The same reaction as Example I is used.
- the 7 resulting product of the double (or mixed salts) can be converted by heating at the required temperature into sodium acidpyrophosphate:
- Example III 200 lbs. of tetrasodium pyrophosphate analyzing 53.4% P205 were mixed with 194.19 lbs. of phosphoric acid analyzing 55% P205, and the mass was kept agitated for about 20 minutes, then passed through a swinghammer mill, screened to minus 6 mesh, then dried as in Example I. or Example II, to get, respectively.
- the process of producing a sodium acid phosphate product which comprises mixing and reacting tetra sodium pyrophosphate with phosphoric acid using approximately one mol of the former to two mols of the latter, and heating the product under such conditions that the material is dried and not more than one molecule of combined water is driven off for each two'mols of monosodium phosphate present in the said product.
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
Description
Patented Dec. 21, 1943 PROCESS OF PRODUCING SODIUM ACID PYROPHOSPHATE Frank H. Perrln and Otis w. Allen, Pulaski, Tenn.,
assignorsto International Minerals & Chemical Corporation, Chicago, Ill., a corporation of New York No Drawing. Application September 14, 1940,
Serial No. 356,834
Claims.
This invention relates to the production of pyrophos'phates that are particularly suitable, for example, for leavening agents or baking powders.
In carrying out the invention, sodium acid pyrophosphate, NazHzPaOr, or a double salt of sodium acid pyrophosphate-monosodium phosphate, Na2H2P2O72NaH2PO4, or a physical mixture of the two salts. is produced. It is immaterial in carrying out the process whether the result is a double salt or a physical mixture of the two salts.
Heretofore, acid sodium pyrophosphate has been produced by heating mono-sodiumphosphate, NaH2PO4, at about 200 C. for about six or eight hours in accordance with the formula 2NaH2PO4=Na2H2PzO7+H2Q ,Many mechanical difficulties have been encountered in attempts to produce mono-sodiumphosphate, and corrosive-proof containers such as stainless steel are needed. It is difficult to dry the product to prevent it from melting or fusing. The mixture becomes very sticky at elevated temperatures and is inconvenient to stir or handle. Also, when stored it cakes into a very hard solid lump in a few days.
By the present invention prior difficulties are overcome and sodium acid pyrophosphate is produced in a rapid and satisfactory way at comparatively low cost without encountering many of the mechanical difficulties heretofore experienced.
The following examples are given to illustrate the invention, but it is to be understood that the invention is not limited to the details given.
Example I Tetrasodium pyrophosphate of any fineness, finely ground being preferred, is reacted with phosphoric acid, at room temperature, with the heat of reaction being all that is required to complete the reaction, using one mol of the former to two mols of the latter:
This reaction is reversible only when the compounds are in solution. The physical condition of the double salt (or mixed salts) will be dependent on the strength of phosphoric acid used, but in all cases some drying, at less than the temperature required to convert monosodium phosphate into sodium acid pyrophosphate, is required so that the final product will be in such physical condition as to permit grinding into a powder. The preferred drying temperature is near that of boiling water, 212 F. Any of the condition.
standard types of dryers are satisfactory for this phosphoric acid the product can be kept agitated .for about 20 minutes, to prevent setting as a mass. It will then be in such physical condition as to permit grinding in a swinghammer mill, for example, and subsequently screened to minus 6 mesh. This 6 mesh product can then be introduced into a rotary dryer and heated to a temperature of about 212 F. for 20 minutes, and discharged from the dryer in'the physical desired This product, the double salt (or mixed salts) of NazHaPaOmZNaI-IzPO-r, has a Slight tendency to be hygroscopic after final drying, but not nearly so much as monosodium phosphate alone. This hygroscopic tendency can be taken care of in the usual ways, for instance, by coating with starch. Or it can be marketed as such, notwithstanding its tendency to be slightly hygroscopic.
Example II The same reaction as Example I is used. The 7 resulting product of the double (or mixed salts) can be converted by heating at the required temperature into sodium acidpyrophosphate:
minutes the change to NazHzPzo-z is complete.
The final product. Nazl-lzPzo-z, is stable, and shows no signs of being hydroscopic.
Example III 200 lbs. of tetrasodium pyrophosphate analyzing 53.4% P205 were mixed with 194.19 lbs. of phosphoric acid analyzing 55% P205, and the mass was kept agitated for about 20 minutes, then passed through a swinghammer mill, screened to minus 6 mesh, then dried as in Example I. or Example II, to get, respectively. sodium acid pyrophosphate-monosod um phosphate (or a mixture of the two salts) and sodium acid pyrophosphate.
It has been found that crystalline tetrasodium pyrophosphate would work just as well, and that different strengths of phosphoric acid will also work just as well in carrying out the process. The reaction is dependent on the total pounds of P205 in the tetrasodium pyrophosphate being equal to the total pounds of P205 in the phosphoric acid. Either or both of the two products will serve as a source of the acid radical in leavening agents, or they can be used in any manner a user might desire, their use not being limited to leavening agents.
What is claimed is:
1. The process of producing a sodium acid phosphate product, which comprises mixing and reacting tetra sodium pyrophosphate with phosphoric acid using approximately one mol of the former to two mols of the latter, and heating the product under such conditions that the material is dried and not more than one molecule of combined water is driven off for each two'mols of monosodium phosphate present in the said product.
2. The process of claim 1, in which the drying I temperature is approximately 212 F.
8.The process of producing a sodium acid phosphate product which comprises mixing tetra sodium pyrophosphate with phosphoric acid,
15 phoric acid, using approximately one mol of the former to two mols of the latter to produce a I mixture of sodium acid pyrophosphate and sodium acid phosphate, and heating the resulting mixture at a temperature of approximately 400 20 to approximately 420 F. for approximately 60 minutes.
FRANK H. PERRIN. OTIS W. ALLEN.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US356834A US2337491A (en) | 1940-09-14 | 1940-09-14 | Process of producing sodium acid pyrophosphate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US356834A US2337491A (en) | 1940-09-14 | 1940-09-14 | Process of producing sodium acid pyrophosphate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2337491A true US2337491A (en) | 1943-12-21 |
Family
ID=23403154
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US356834A Expired - Lifetime US2337491A (en) | 1940-09-14 | 1940-09-14 | Process of producing sodium acid pyrophosphate |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US2337491A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2423154A (en) * | 1946-01-11 | 1947-07-01 | Jolly W O'brien | Admix for drilling mud |
| US2715059A (en) * | 1951-08-06 | 1955-08-09 | Kelite Products Inc | Phosphatizing composition |
| US2776198A (en) * | 1953-07-28 | 1957-01-01 | Spencer Chem Co | Preparation of phosphate fertilizer and animal feed supplement |
-
1940
- 1940-09-14 US US356834A patent/US2337491A/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2423154A (en) * | 1946-01-11 | 1947-07-01 | Jolly W O'brien | Admix for drilling mud |
| US2715059A (en) * | 1951-08-06 | 1955-08-09 | Kelite Products Inc | Phosphatizing composition |
| US2776198A (en) * | 1953-07-28 | 1957-01-01 | Spencer Chem Co | Preparation of phosphate fertilizer and animal feed supplement |
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