CS247512B1 - Method of dihydrate or/and anhydrous hydrogen calcium phosphate production - Google Patents
Method of dihydrate or/and anhydrous hydrogen calcium phosphate production Download PDFInfo
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- CS247512B1 CS247512B1 CS393884A CS393884A CS247512B1 CS 247512 B1 CS247512 B1 CS 247512B1 CS 393884 A CS393884 A CS 393884A CS 393884 A CS393884 A CS 393884A CS 247512 B1 CS247512 B1 CS 247512B1
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- Czechoslovakia
- Prior art keywords
- ammonia
- dihydrate
- calcium
- phosphate
- hydroxide
- Prior art date
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- 238000004519 manufacturing process Methods 0.000 title claims description 13
- 238000000034 method Methods 0.000 title claims description 12
- 239000001506 calcium phosphate Substances 0.000 title claims description 6
- 150000004683 dihydrates Chemical class 0.000 title claims description 5
- 229910000389 calcium phosphate Inorganic materials 0.000 title claims description 4
- 235000011010 calcium phosphates Nutrition 0.000 title claims description 3
- 229910052739 hydrogen Inorganic materials 0.000 title 1
- 239000001257 hydrogen Substances 0.000 title 1
- -1 hydrogen calcium phosphate Chemical class 0.000 title 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 25
- 239000000047 product Substances 0.000 claims description 13
- 229910021529 ammonia Inorganic materials 0.000 claims description 12
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 10
- 239000000908 ammonium hydroxide Substances 0.000 claims description 10
- 239000000243 solution Substances 0.000 claims description 10
- 159000000007 calcium salts Chemical class 0.000 claims description 9
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 7
- 239000002244 precipitate Substances 0.000 claims description 6
- 239000002253 acid Substances 0.000 claims description 4
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 4
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 4
- 239000000292 calcium oxide Substances 0.000 claims description 4
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 4
- 239000012266 salt solution Substances 0.000 claims description 4
- 235000019739 Dicalciumphosphate Nutrition 0.000 claims description 3
- 239000000920 calcium hydroxide Substances 0.000 claims description 3
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 3
- NEFBYIFKOOEVPA-UHFFFAOYSA-K dicalcium phosphate Chemical compound [Ca+2].[Ca+2].[O-]P([O-])([O-])=O NEFBYIFKOOEVPA-UHFFFAOYSA-K 0.000 claims description 3
- 229910000390 dicalcium phosphate Inorganic materials 0.000 claims description 3
- 229940038472 dicalcium phosphate Drugs 0.000 claims description 3
- 239000000725 suspension Substances 0.000 claims description 3
- LFVGISIMTYGQHF-UHFFFAOYSA-N ammonium dihydrogen phosphate Chemical compound [NH4+].OP(O)([O-])=O LFVGISIMTYGQHF-UHFFFAOYSA-N 0.000 claims description 2
- 229910000387 ammonium dihydrogen phosphate Inorganic materials 0.000 claims description 2
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 2
- 230000018044 dehydration Effects 0.000 claims description 2
- 238000006297 dehydration reaction Methods 0.000 claims description 2
- MNNHAPBLZZVQHP-UHFFFAOYSA-N diammonium hydrogen phosphate Chemical compound [NH4+].[NH4+].OP([O-])([O-])=O MNNHAPBLZZVQHP-UHFFFAOYSA-N 0.000 claims description 2
- 230000007062 hydrolysis Effects 0.000 claims description 2
- 238000006460 hydrolysis reaction Methods 0.000 claims description 2
- 235000019837 monoammonium phosphate Nutrition 0.000 claims description 2
- 238000000746 purification Methods 0.000 claims description 2
- 239000003381 stabilizer Substances 0.000 claims description 2
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 claims 1
- 229910052588 hydroxylapatite Inorganic materials 0.000 claims 1
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 claims 1
- 239000000347 magnesium hydroxide Substances 0.000 claims 1
- 229910001862 magnesium hydroxide Inorganic materials 0.000 claims 1
- 239000000395 magnesium oxide Substances 0.000 claims 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims 1
- XYJRXVWERLGGKC-UHFFFAOYSA-D pentacalcium;hydroxide;triphosphate Chemical compound [OH-].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O XYJRXVWERLGGKC-UHFFFAOYSA-D 0.000 claims 1
- 238000002360 preparation method Methods 0.000 claims 1
- 230000000979 retarding effect Effects 0.000 claims 1
- 238000001556 precipitation Methods 0.000 description 5
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 238000009835 boiling Methods 0.000 description 3
- FUFJGUQYACFECW-UHFFFAOYSA-L calcium hydrogenphosphate Chemical compound [Ca+2].OP([O-])([O-])=O FUFJGUQYACFECW-UHFFFAOYSA-L 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 2
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 description 2
- ARLZGEXVMUDUQZ-UHFFFAOYSA-N O.O.[Ca] Chemical compound O.O.[Ca] ARLZGEXVMUDUQZ-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000000706 filtrate Substances 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 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 2
- 229940048086 sodium pyrophosphate Drugs 0.000 description 2
- 235000019818 tetrasodium diphosphate Nutrition 0.000 description 2
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- 241001465754 Metazoa Species 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 235000019270 ammonium chloride Nutrition 0.000 description 1
- 150000003863 ammonium salts Chemical class 0.000 description 1
- 239000007900 aqueous suspension Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 229960005069 calcium Drugs 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- YYRMJZQKEFZXMX-UHFFFAOYSA-L calcium bis(dihydrogenphosphate) Chemical compound [Ca+2].OP(O)([O-])=O.OP(O)([O-])=O YYRMJZQKEFZXMX-UHFFFAOYSA-L 0.000 description 1
- 229940062672 calcium dihydrogen phosphate Drugs 0.000 description 1
- XAAHAAMILDNBPS-UHFFFAOYSA-L calcium hydrogenphosphate dihydrate Chemical compound O.O.[Ca+2].OP([O-])([O-])=O XAAHAAMILDNBPS-UHFFFAOYSA-L 0.000 description 1
- 229960001714 calcium phosphate Drugs 0.000 description 1
- 238000005119 centrifugation Methods 0.000 description 1
- 239000002537 cosmetic Substances 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- BNIILDVGGAEEIG-UHFFFAOYSA-L disodium hydrogen phosphate Chemical compound [Na+].[Na+].OP([O-])([O-])=O BNIILDVGGAEEIG-UHFFFAOYSA-L 0.000 description 1
- 229910000397 disodium phosphate Inorganic materials 0.000 description 1
- 235000019800 disodium phosphate Nutrition 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 229910001629 magnesium chloride Inorganic materials 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 235000019691 monocalcium phosphate Nutrition 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 239000012047 saturated solution Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Cosmetics (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
Description
Vynález se týká způsobu výroby dihydrátu nebo/a bezvodého hydrogenfosforečnanu vápenatého.BACKGROUND OF THE INVENTION The present invention relates to a process for the production of calcium dihydrate and / or anhydrous calcium phosphate.
Doposud je většinou výroba výše uvedených produktů doprovázena tvorbou vedlejších, méně hodnotných produktů, které spotřebovávají část vstupních surovin. Příkladem takové technologie je postup, při němž se v kyselině trihydrogenfosforečné rozpouští vápenec tak, aby vznikl dihydrogenfosforečnan vápenatý, z něhož se žádaný produkt získá vysrážením nejčastěji roztokem hydroxidu sodného.Until now, the production of the above products is usually accompanied by the formation of by-products, which are less valuable, which consume part of the feedstock. An example of such a technology is a process in which limestone is dissolved in trihydrogenphosphoric acid to form calcium dihydrogenphosphate, from which the desired product is obtained by precipitation most often with sodium hydroxide solution.
Po oddělení sraženiny produktu ze vzniklé suspenze zbývá roztok obsahující hydrogenfosforečnan sodný.After separation of the product precipitate from the resulting suspension, a solution containing sodium hydrogen phosphate remains.
Jak je tedy zřejmo, spočívá nedostatek dosud používaných srážecích postupů především v tom,'že se kvantitativně nepřevádějí výchozí suroviny na požadovaný produkt.Thus, as is evident, the drawback of the precipitation processes used hitherto is mainly that the starting materials are not quantitatively converted to the desired product.
Tuto nevýhodu odstraňuje podle vynálezu způsob výroby dihydrátu nebo bezvodého hydrogenfosforečnanu vápenatého a/nebo jejich vzájemné směsi z kyseliny trihydrogenfosforečné, vodorozpustné vápenaté soli a amoniaku nebo/a hydroxidu amonného.This disadvantage is overcome by the process according to the invention for producing calcium dihydrate or anhydrous dicalcium phosphate and / or a mixture thereof from trihydrogenphosphoric acid, water-soluble calcium salt and ammonia and / or ammonium hydroxide.
Podstata způsobu výroby spočívá v tom, že se do reakce uvedou kyselina trihydrogenfosforečná, vodorozpustná vápenatá sůl a amoniak nebo/a hydroxid amonný, ze vzniklé suspenze se oddělí sraženina, která se zpracuje na produkt, ze zbylého roztoku se přidáním oxidu nebo/a hydroxidu vápenatého nebo jejich směsi regeneruje amoniak nebo/a hydroxid amonný a roztok vápenaté soli, které lze částečně nebo úplně vrátit do výroby.The essence of the production process is to react with phosphoric acid, water-soluble calcium salt and ammonia and / or ammonium hydroxide, to precipitate the resulting slurry, which is processed into a product, from the remaining solution by adding calcium oxide and / or calcium hydroxide. or mixtures thereof regenerate ammonia and / or ammonium hydroxide and a calcium salt solution which can be partially or completely returned to production.
Podle dalšího význaku vynálezu se může místo části nebo veškeré kyseliny trihydrogenfosforečné a části nebo veškerého amoniaku nebo/a hydroxidu amonného použít přímo nebo po přečištění dihydrogenfosforečnan amonný nebo/a hydrogenfosforečnan amonný.According to a further feature of the invention, instead of some or all of the trihydrogen phosphoric acid and part or all of the ammonia and / or ammonium hydroxide, ammonium dihydrogen phosphate and / or ammonium hydrogen phosphate can be used directly or after purification.
Podle dalšího význaku vynálezu je možno přidávat stabilizátory zpomalující dehydrataci dihydrátu nebo/a hydrolýzu bezvodého hydrogenfosforečnanu vápenatého.According to a further feature of the invention, stabilizers may be added to retard dehydration of the dihydrate and / or hydrolysis of the anhydrous dibasic calcium phosphate.
Základní účinek způsobu výroby podle vynálezu spočívá v tom, že se’ dosahuje bezodpadového cyklu výroby tím, že veškerý vstupující fosfor a vápník, kromě technologických ztrát, přecházejí na klíčový produkt. Tím se způsob výroby podle vynálezu stává oproti dosud známým výrobním postupům výrazně výhodnějším.The basic effect of the process according to the invention is that a waste-free production cycle is achieved by transferring all of the incoming phosphorus and calcium, except for technological losses, to the key product. As a result, the production method according to the invention becomes significantly more advantageous than the previously known production methods.
Výroba může být kontinuální, diskontinuální, nebo kombinací obou těchto postupů. Postupuje se například tak, že roztok kyseliny trihydrogenfosforečné o koncentraci 1 - 95 % hmotnosti, roztok vodorozpustné vápenaté soli o koncentraci 1 % hmotnosti až nasyceného roztoku při dané teplotě a amoniak nebo/a hydroxid amonný se smísí současně nebo postupně, a to jednostupňově nebo vícestupňové, případně je možno provést současně i ředění.The manufacture may be continuous, discontinuous, or a combination of both. For example, a solution of 1-95% by weight of trihydrogenphosphoric acid, a solution of 1% by weight of water-soluble calcium salt to a saturated solution at a given temperature and ammonia and / or ammonium hydroxide are mixed simultaneously or sequentially in a single or multi-stage process. , or dilution may be performed simultaneously.
Teplota se pohybuje v závislosti na poŽadovaném sazení produkh od 0 °C až do bodu varu. Vzniklá sraženina se oddělí, například filtrací nebo odstředěním, promyje a vysuší, případně částečně nebo úplně dehydratuje tepelným zpracováním k získání produktu požadovaného složení.Lota Te p is p oh y trend is in the conclusions and beyond doubt on oŽadovan P E M produkh pushing through 0 °, and d of d b o u boiling. The resulting precipitate is collected, for example by filtration or centrifugation, washed and dried, optionally partially or completely dehydrated by heat treatment to obtain the product of the desired composition.
Ze zbylého roztoku obsahujícího amonnou sůl se regeneruje ' amoniak a vodorozpustná vápenatá sůl přidáním oxidu nebo hydroxidu vápenatého nebo jejich směsi v tuhém stavu nebo ve vodné suspenzi. Regenerace se s výhodou provádí při teplotě odpovídající varu regenerovaného roztoku.From the remaining solution containing the ammonium salt, ammonia and the water-soluble calcium salt are regenerated by the addition of calcium oxide or hydroxide or a mixture thereof in solid or aqueous suspension. The regeneration is preferably carried out at a temperature corresponding to the boiling of the regenerated solution.
Amoniak nebo/a hydroxid amonný a roztok vodorozpustné vápenaté soli se po eventuálním zbavení mechanickýchnečistot a po případném dalším zahuštění a ochlazení mohou opět částečně nebo úplně vrátit zpět do výroby. Promývací vody je možno začlenit do výrobního cyklu, Přídavné látky, například dvojfosforečnan sodný, je výhodné dávkovat do roztoků vedených na srážení nebo/a přímo do srážecího zařízení nebo/a do vlhkého či suchého produktu nebo/a při eventuální úpravě velikosti částic mletím.The ammonia and / or ammonium hydroxide and the water-soluble calcium salt solution can be returned to the production again, partially or completely, after the eventual removal of mechanical impurities and possibly further concentration and cooling. The washing water can be incorporated into the production cycle. Additives, for example sodium pyrophosphate, are advantageously metered into the solutions to be precipitated and / or directly to the precipitation apparatus and / or to the wet or dry product and / or to the particle size adjustment by milling.
Žpůsob výroby podle vynálezu je dále blíže popsán na konkrétních příkladech provedení.The production method according to the invention is described in more detail below with reference to specific examples.
PřikladlHe did
10% roztok chloridu vápenatého obsahující 3 % hmotnosti chloridu hořečnatého byl v míchaném vsádkovém reaktoru smíchán s ekvimolárním množstvím kyseliny trihydrogenfosfořečné o koncentraci 85 % hmotnosti, která obsahovala 1 % hmotnosti dvojfosforečnanu sodného.A 10% calcium chloride solution containing 3% by weight magnesium chloride was mixed with an equimolar amount of 85% by weight of trihydrogen phosphoric acid in a stirred batch reactor containing 1% by weight of sodium pyrophosphate.
Plynným amoniakem bylo upraveno pH na hodnotu 7. Teplota nepřesáhla 30 °C. Vzniklá sraženina byla oddělena filtrací, promyta a vysušena při 40 °C. Výsledným produktem byl dihydrát hydrogenfosforečnanu vápenatého.The pH was adjusted to 7 with ammonia gas. The temperature did not exceed 30 ° C. The resulting precipitate was collected by filtration, washed and dried at 40 ° C. The resulting product was dibasic calcium phosphate dihydrate.
♦♦
Filtrát a promývací vody byly zavedeny spolu s oxidem vápenatým, v množství,které odpovídalo 0,5% přebytku oproti stechiometrii vzhledem к chloridu amonnému, do regeneračního zařízení. V regenerátoru byla udržována teplota bodu varu roztoku.The filtrate and washings were fed with calcium oxide, in an amount corresponding to 0.5% excess over stoichiometry relative to ammonium chloride, into the recovery plant. The boiling point of the solution was maintained in the regenerator.
Suspenze opouštějící regenerátor byla filtrací zbavena mechanických nečistot a čirý filtrát po zahuštění a ochlazení byl použit spolu s regenerovaným amoniakem opět ke srážení.The suspension leaving the regenerator was freed from mechanical impurities by filtration, and the clear filtrate, after concentration and cooling, was used together with the regenerated ammonia to precipitate again.
Příklad 2Example 2
Proces byl veden jako v příkladu 1 s tím rozdílem, že teplota srážení byla udržována na 80 °C. Vysušená sraženina byla dehydratována nepřímým zahříváním vodní parou při teplotě 95 °C. Výsledným produktem byl bezvodý hydrogenfosforečnan vápenatý,The process was conducted as in Example 1 except that the precipitation temperature was maintained at 80 ° C. The dried precipitate was dehydrated by indirect heating with steam at 95 ° C. The resulting product was anhydrous dibasic calcium phosphate,
Příklad3Example3
Proces byl veden jako v příkladu 1 s tím rozdílem, že teplota srážení byla udržována na 65 °C. Vysušená sraženina byla dehydratována nepřímým zahříváním vodní parou při teplotě 70 °c. Výsledným produktem byla směs, která obsahovala 60 % hmotnosti dihydrátu a 40 % hmotnosti bezvodého hydrogenfosforečnanu vápenatého.The process was conducted as in Example 1 except that the precipitation temperature was maintained at 65 ° C. The dried precipitate was dehydrated by indirect heating with steam at 70 ° C. The resulting product was a mixture containing 60% by weight of dihydrate and 40% by weight of anhydrous dibasic calcium phosphate.
Získané produkty jsou vhodné к použití v kosmetickém, potravinářském a farmaceutickém průipyslu a jako·obohacující přísada krmných směsí v živočišné výrobě.The products obtained are suitable for use in the cosmetic, food and pharmaceutical industries and as an enriching additive in animal feed.
Claims (3)
Priority Applications (11)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CS393884A CS247512B1 (en) | 1984-05-25 | 1984-05-25 | Method of dihydrate or/and anhydrous hydrogen calcium phosphate production |
| BG6975085A BG45759A1 (en) | 1984-05-25 | 1985-04-15 | Method for preparing of dihydrate and/or waterless hydrogenphosphate of calcium |
| SU857773812A SU1518299A1 (en) | 1984-05-25 | 1985-04-17 | Method of producing calcium hydrogene phosphate |
| DD27522485A DD255444A3 (en) | 1984-05-25 | 1985-04-17 | METHOD FOR OBTAINING CALCIUM HYDROGEN PHOSPHATE-2-WATER OR / AND WATER-FREE CALCIUM HYDROGEN PHOSPHATE |
| NL8501303A NL8501303A (en) | 1984-05-25 | 1985-05-08 | PROCESS FOR THE PREPARATION OF CALCIUM HYDROGEN PHOSPHATE DIHYDRATE AND / OR THE ANHYDROUS FORM THEREOF. |
| DE19853517608 DE3517608A1 (en) | 1984-05-25 | 1985-05-15 | METHOD FOR PRODUCING CALCIUM HYDROGEN PHOSPHATE DIHYDRATE AND / OR ITS WATER-FREE SHAPES |
| GB08512556A GB2159510B (en) | 1984-05-25 | 1985-05-17 | Process for the production of anhydrous calcium hydrogen phosphates |
| FR8507570A FR2564817B1 (en) | 1984-05-25 | 1985-05-20 | PROCESS FOR THE MANUFACTURE OF CALCIUM HYDROGEN PHOSPHATE AND / OR ITS ANHYDROUS FORM |
| YU00875/85A YU87585A (en) | 1984-05-25 | 1985-05-24 | Process for obtaining calcium-biophosphate dihydrate and/or anhydrated calcium-biophosphate |
| HU851997A HU201496B (en) | 1984-05-25 | 1985-05-24 | Process for producing calcium-hydrogen-phosphate-dihydtrate and-or calcium-hydrogen-phosphate siccum |
| IT20868/85A IT1183673B (en) | 1984-05-25 | 1985-05-24 | PROCESS FOR THE PRODUCTION OF CALCIUM HYDROGEN PHOSPHATE DIHYDRATE AND/OR ANHYDROUS CALCIUM HYDROGEN PHOSPHATE |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CS393884A CS247512B1 (en) | 1984-05-25 | 1984-05-25 | Method of dihydrate or/and anhydrous hydrogen calcium phosphate production |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CS247512B1 true CS247512B1 (en) | 1987-01-15 |
Family
ID=5380901
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CS393884A CS247512B1 (en) | 1984-05-25 | 1984-05-25 | Method of dihydrate or/and anhydrous hydrogen calcium phosphate production |
Country Status (4)
| Country | Link |
|---|---|
| BG (1) | BG45759A1 (en) |
| CS (1) | CS247512B1 (en) |
| DD (1) | DD255444A3 (en) |
| SU (1) | SU1518299A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113353905B (en) * | 2021-06-29 | 2024-05-17 | 湖北兴发化工集团股份有限公司 | Process for preparing medicinal coarse particle anhydrous calcium hydrophosphate |
-
1984
- 1984-05-25 CS CS393884A patent/CS247512B1/en unknown
-
1985
- 1985-04-15 BG BG6975085A patent/BG45759A1/en unknown
- 1985-04-17 DD DD27522485A patent/DD255444A3/en not_active IP Right Cessation
- 1985-04-17 SU SU857773812A patent/SU1518299A1/en active
Also Published As
| Publication number | Publication date |
|---|---|
| SU1518299A1 (en) | 1989-10-30 |
| BG45759A1 (en) | 1989-08-15 |
| DD255444A3 (en) | 1988-04-06 |
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