BE499807A - - Google Patents
Info
- Publication number
- BE499807A BE499807A BE499807DA BE499807A BE 499807 A BE499807 A BE 499807A BE 499807D A BE499807D A BE 499807DA BE 499807 A BE499807 A BE 499807A
- Authority
- BE
- Belgium
- Prior art keywords
- phase
- phosphate
- potassium
- chloride
- weak acid
- Prior art date
Links
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims description 10
- 239000002253 acid Substances 0.000 claims description 9
- NBIIXXVUZAFLBC-UHFFFAOYSA-K [O-]P([O-])([O-])=O Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 8
- VEXZGXHMUGYJMC-UHFFFAOYSA-M chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 8
- 239000010452 phosphate Substances 0.000 claims description 8
- 239000003513 alkali Substances 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 239000001103 potassium chloride Substances 0.000 claims description 5
- 239000011780 sodium chloride Substances 0.000 claims description 5
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 4
- NEFBYIFKOOEVPA-UHFFFAOYSA-K Dicalcium phosphate Chemical compound [Ca+2].[Ca+2].[O-]P([O-])([O-])=O NEFBYIFKOOEVPA-UHFFFAOYSA-K 0.000 claims description 4
- 235000019739 Dicalciumphosphate Nutrition 0.000 claims description 4
- 235000015450 Tilia cordata Nutrition 0.000 claims description 4
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 4
- 239000001506 calcium phosphate Substances 0.000 claims description 4
- CURLTUGMZLYLDI-UHFFFAOYSA-N carbon dioxide Chemical group O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 4
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 4
- 229910000390 dicalcium phosphate Inorganic materials 0.000 claims description 4
- 229940038472 dicalcium phosphate Drugs 0.000 claims description 4
- 239000004571 lime Substances 0.000 claims description 4
- 150000003839 salts Chemical class 0.000 claims description 4
- 239000001569 carbon dioxide Substances 0.000 claims description 3
- 150000001447 alkali salts Chemical class 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 2
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 claims 2
- RAHZWNYVWXNFOC-UHFFFAOYSA-N sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 claims 2
- ZPWVASYFFYYZEW-UHFFFAOYSA-L Dipotassium phosphate Chemical group [K+].[K+].OP([O-])([O-])=O ZPWVASYFFYYZEW-UHFFFAOYSA-L 0.000 claims 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims 1
- 239000011575 calcium Substances 0.000 claims 1
- 229910052791 calcium Inorganic materials 0.000 claims 1
- 150000003841 chloride salts Chemical class 0.000 claims 1
- 238000000354 decomposition reaction Methods 0.000 claims 1
- 238000010438 heat treatment Methods 0.000 claims 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims 1
- 239000011591 potassium Substances 0.000 claims 1
- 229910052700 potassium Inorganic materials 0.000 claims 1
- 239000001184 potassium carbonate Substances 0.000 claims 1
- 229910000027 potassium carbonate Inorganic materials 0.000 claims 1
- 235000011164 potassium chloride Nutrition 0.000 claims 1
- 239000000376 reactant Substances 0.000 claims 1
- 239000012071 phase Substances 0.000 description 5
- LWIHDJKSTIGBAC-UHFFFAOYSA-K potassium phosphate Substances [K+].[K+].[K+].[O-]P([O-])([O-])=O LWIHDJKSTIGBAC-UHFFFAOYSA-K 0.000 description 5
- 239000000203 mixture Substances 0.000 description 3
- 229910000160 potassium phosphate Inorganic materials 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N HCl Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- QORWJWZARLRLPR-UHFFFAOYSA-H Tricalcium phosphate Chemical class [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 description 2
- SLMHDVBWFGHGSP-UHFFFAOYSA-K calcium;potassium;phosphate Chemical compound [K+].[Ca+2].[O-]P([O-])([O-])=O SLMHDVBWFGHGSP-UHFFFAOYSA-K 0.000 description 2
- RBLGLDWTCZMLRW-UHFFFAOYSA-K dicalcium phosphate dihydrate Substances O.O.[Ca+2].[Ca+2].[O-]P([O-])([O-])=O RBLGLDWTCZMLRW-UHFFFAOYSA-K 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 235000019798 tripotassium phosphate Nutrition 0.000 description 2
- XPPKVPWEQAFLFU-UHFFFAOYSA-J Pyrophosphate Chemical compound [O-]P([O-])(=O)OP([O-])([O-])=O XPPKVPWEQAFLFU-UHFFFAOYSA-J 0.000 description 1
- 229940048084 Pyrophosphate Drugs 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 229910001514 alkali metal chloride Inorganic materials 0.000 description 1
- -1 alkali metal salts Chemical class 0.000 description 1
- 229910052910 alkali metal silicate Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 150000001805 chlorine compounds Chemical class 0.000 description 1
- 230000000875 corresponding Effects 0.000 description 1
- 235000011180 diphosphates Nutrition 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 159000000011 group IA salts Chemical class 0.000 description 1
- XLYOFNOQVPJJNP-ZSJDYOACSA-N heavy water Substances [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 239000012265 solid product Substances 0.000 description 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
- C01B25/26—Phosphates
- C01B25/45—Phosphates containing plural metal, or metal and ammonium
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D17/00—Rubidium, caesium or francium compounds
- C01D17/003—Compounds of alkali metals
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D5/00—Sulfates or sulfites of sodium, potassium or alkali metals in general
- C01D5/04—Preparation of sulfates with the aid of sulfurous acid or sulfites, e.g. Hargreaves process
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D7/00—Carbonates of sodium, potassium or alkali metals in general
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Cosmetics (AREA)
Description
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PROCEDE POUR'LA PREPARATION DE SELS ALCALINS A PARTIR DE CHLORURES
ALCALINS.
Les procédés actuellement connus pour la préparation des sels alcalins à partir de chlorures alcalins sont basés, soit sur une électrolyse., soit sur une réaction chimiqueo Dans ce dernier cas, on a déjà proposé de faire intervenir une substance intermédiaire susceptible de fixer l'élément alcalin chlorure, en donnant un corps capable de libérer ensuite l'élément alcalin par action d'un acide. Le corps intermédiaire utilisé est généralement une substan- ce possédant une fonction acide faible dans les conditions de la réaction.
On a préconisé dans ce but des corps tels que, par exemple, Sio2 Cependant, 1-' emploi de la silice, convenable en théorie, présente dans son application pratique des inconvénients multiples la réaction de transformation du chlorure alcalin en silicate alcalin est incomplèteet de plus., la formation de précipités colloïdaux difficiles à filtrer empêche toute réalisation industriel- le du procédé.
Le procédé .suivant l'invention consiste essentiellement à traiter un chlorure alcalin par un phosphate de calcium-non saturé, de manière à former un phosphate double calco-alcalin; ce selest ensuite décomposé par l'acide du sel que l'on désire obtenir.
Le procédé de préparation comprend donc deux phaseso Dans une première phase, on fait réagir le chlorure alcalin avec du phosphate de calcium- non saturé, c'est-à-dire possédant une fonction acide faible à la température de réaction;, en présence de vapeur d'eau ou de gaz en contenant telles que des fumées d'un foyer industriel, par exemple.
La température de réaction peut varier dans des limites assez étendues; les meileurs résultats sont obtenus pour des températures variant entre 700 et 9000. Les produits de la réaction sont., d'une part de l'acide chlorhydrique, qui peut être récupéré par dissolu- tion 'dans l'eau, ou par. tout autre moyen appropriée et d'autre part un phos- phate double calco-alcalin. Dans la deuxième phase du procédé,.
le phosphate dou- ble obtenu dans la première phase réduit à 1-'état pulvérulent, est mis en sus-
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pension dans l'eau, et traité par un acide faible, de préférence à l'état gazeux, par exemple CO2, So2, ou tout autre, sous une pression égale où @ supérieure à la pression atmosphérique, et à une température égale ou supérieure à la température ambiante. Ainsi, d'une part on obtient le sel alcalin de l'acide faible, d'autre part on régénère le phosphate de chaux utilisé dans la première phase du procédé, qui peut ainsi servir à traiter une nouvelle charge de chlorure alcalin.
L'exemple suivant illustre l'invention, mais il n'est nullement limitatif.
EXEMPLE : On part d'un mélange composé de 100 parties de KCl sec et de 180 parties de phosphate dicalcique dihydraté Po4 CAR, 2H2O (ou la quantité cor- respondante de sel anhydre ou de pyro-phosphate).
Ces matières premières sont broyées finement et mélangées ensui- te intimement. On les chauffe en présence d'un courant de vapeur d'eau à une température croissante jusqu'au rouge. L'excès de KCl est volatilisé. En fin d' opération, on obtient un prodit solide exempt de chlorure et constitué essen- tiellement par du phosphate calco-potassique Po4 CaK
Le rendement:. de l'opération est pratiquement quantitatif, par rapport au P2O5 engagé, de telle sorte qu'en fin d'opération on obtient, compte tenu des quantités de matières premières, 185 parties de phosphate calco- potassique .
Ces 185 parties de phosphate calco-potassique sont mises en sus- pension dans 375 parties d'eauo On fait alors agir de l'anhydride carbonique sous une pression de réaction de 15 Kg/cm2 et à la température ambiante. En fin d'opération, on sépare la phase solide de la phase liquide.
La phase liquide donne, après évaporation, un extrait sec qui a la composition suivante, en poids s (CO3HK = 97,6 parties (Phosphate de potassium 3,1 " ( (Phosphate dicalcique = 0,6 "
Après calcination de l'extrait sec, on obtient un produit ayant la composition suivante (CO3K2 = 67,5 parties ( Phosphate de potassium 3,1 " ( Phosphate dicalcique = 0,6 " En définitive, le rendement en CO3K2, par rapport au KCl non wolatilisé, atteint 95%, le KCl volatilisé étant aisément récupérable.
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PROCESS FOR THE PREPARATION OF ALKALINE SALTS FROM CHLORIDES
ALKALINS.
The currently known processes for the preparation of alkali metal salts from alkali metal chlorides are based either on electrolysis or on a chemical reaction In the latter case, it has already been proposed to involve an intermediate substance capable of fixing the element. alkaline chloride, giving a body capable of subsequently releasing the alkaline element by the action of an acid. The intermediate used is generally a substance having a weak acid function under the conditions of the reaction.
For this purpose, substances such as, for example, Sio2 have been recommended. However, the use of silica, suitable in theory, presents in its practical application multiple drawbacks the reaction for converting the alkali chloride into the alkali silicate is incomplete. moreover, the formation of colloidal precipitates difficult to filter out prevents any industrial realization of the process.
The method following the invention consists essentially in treating an alkali chloride with an unsaturated calcium phosphate, so as to form a double calc-alkali phosphate; this salt is then decomposed by the acid of the desired salt.
The preparation process therefore comprises two phases: In a first phase, the alkali chloride is reacted with unsaturated calcium phosphate, that is to say having a weak acid function at the reaction temperature ;, in the presence of water vapor or gas containing it, such as fumes from an industrial fireplace, for example.
The reaction temperature can vary within fairly wide limits; the best results are obtained for temperatures varying between 700 and 9000. The products of the reaction are., on the one hand hydrochloric acid, which can be recovered by dissolving 'in water, or by. any other suitable means and on the other hand a double calc-alkaline phosphate. In the second phase of the process ,.
the double phosphate obtained in the first phase reduced to 1-'pulverulent state, is suspended
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pension in water, and treated with a weak acid, preferably in the gaseous state, for example CO2, So2, or any other, under a pressure equal to or greater than atmospheric pressure, and at a temperature equal to or greater at room temperature. Thus, on the one hand, the alkali salt of the weak acid is obtained, and on the other hand, the lime phosphate used in the first phase of the process is regenerated, which can thus serve to treat a new charge of alkali chloride.
The following example illustrates the invention, but it is in no way limiting.
EXAMPLE: The starting point is a mixture composed of 100 parts of dry KCl and 180 parts of dicalcium phosphate dihydrate Po4 CAR, 2H2O (or the corresponding quantity of anhydrous salt or of pyro-phosphate).
These raw materials are finely ground and then mixed thoroughly. They are heated in the presence of a stream of water vapor at a temperature increasing to red. The excess KCl is volatilized. At the end of the operation, a solid product free of chloride is obtained and consists essentially of calcium-potassium phosphate Po4 CaK.
The yield:. The operation is practically quantitative, relative to the P2O5 involved, so that at the end of the operation, taking into account the quantities of raw materials, 185 parts of calcium-potassium phosphate are obtained.
These 185 parts of calco-potassium phosphate are suspended in 375 parts of water. Carbon dioxide is then allowed to act under a reaction pressure of 15 kg / cm 2 and at room temperature. At the end of the operation, the solid phase is separated from the liquid phase.
The liquid phase gives, after evaporation, a dry extract which has the following composition, by weight s (CO3HK = 97.6 parts (potassium phosphate 3.1 "((dicalcium phosphate = 0.6"
After calcination of the dry extract, a product is obtained having the following composition (CO3K2 = 67.5 parts (potassium phosphate 3.1 "(dicalcium phosphate = 0.6" Ultimately, the yield of CO3K2, relative to Non-wolatilized KCl reaches 95%, the volatilized KCl being easily recoverable.
Claims (1)
Publications (1)
Publication Number | Publication Date |
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BE499807A true BE499807A (en) |
Family
ID=142096
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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BE499807D BE499807A (en) |
Country Status (1)
Country | Link |
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BE (1) | BE499807A (en) |
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0
- BE BE499807D patent/BE499807A/fr unknown
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