Dicalciumpyrophosphat

Bezeichnung:Dicalciumpyrophosphat

CAS-Nr7790-76-3

Englisch Name:CALCIUM PYROPHOSPHATE

CBNumberCB3449572

SummenformelCa2O7P2

Molgewicht254.1

MOL-Datei7790-76-3.mol

Synonyma

Dicalciumpyrophosphat

Dicalciumpyrophosphat physikalisch-chemischer Eigenschaften

Schmelzpunkt	1230 °C
Dichte	3.09 g/mL at 25 °C(lit.)
Löslichkeit	H2O: insoluble(lit.)
Aggregatzustand	Powder
Wichte	3.09
Farbe	White
Geruch (Odor)	at 100.00?%. odorless
Wasserlöslichkeit	Soluble in hydrochloric acid and nitric acid. Insoluble in water.
LogP	-3.420 (est)
CAS Datenbank	7790-76-3(CAS DataBase Reference)
EPA chemische Informationen	Diphosphoric acid, calcium salt (1:2) (7790-76-3)

Sicherheit

Kennzeichnung gefährlicher	Xi
R-Sätze:	36/37/38
S-Sätze:	26-36
WGK Germany	3
TSCA	Yes
HS Code	28353100
Giftige Stoffe Daten	7790-76-3(Hazardous Substances Data)

Gefahreninformationscode (GHS)

CALCIUM PYROPHOSPHATE Chemische Eigenschaften,Einsatz,Produktion Methoden

R-Sätze Betriebsanweisung:
R36/37/38:Reizt die Augen, die Atmungsorgane und die Haut.
S-Sätze Betriebsanweisung:
S26:Bei Berührung mit den Augen sofort gründlich mit Wasser abspülen und Arzt konsultieren.
S36:DE: Bei der Arbeit geeignete Schutzkleidung tragen.
Beschreibung
Calcium pyrophosphate has the molecular formula of Ca2P2O7 and the molecular weight of 254.1378 g/mol. It has the CAS number of 7790-76-3. It may be prepared by the solid-state reaction of the dibasic orthophosphate, or alternately by the precipitation of a soluble Ca salt with aqueous pyrophosphoric acid:
2CaHPO4 + heat ? Ca2P2O7 +H2O
CaCl2 (aq) +H4P2O7 (aq) ? Ca2P2O7 (solid) + 2HCl (aq)
The solid-state reaction produces an amorphous crystal at 240–500°C. b-Ca2P2O7 forms >750°C and a-Ca2P2O7 forms in the temperature range of 1140 to 1350°C. The free energy of formation, △Gf=-3132 kcal/mol.
The product of the aqueous method is the dihydrate, Ca2P2O7·2H2O. It is a white powder and has the CAS number of 7790-76-3. It is insoluble in water but soluble in dilute acids. The anhydrate decomposes at 1353°C to form a metaphosphate:
Ca2P2O7 + heat ? Ca(PO3)2 + CaO
Calcium pyrophosphate is dimorphic. The phase transformation and sintering behaviors of Ca2P2O7 with different phase composition has been investigated by using X-ray powder diffraction (XRD), dilatometery and SEM techniques. It was found that although α-Ca2P2O7 (high-temperature form) could be maintained during its cooling process, it was metastable and retransformed into β-Ca2P2O7 (low-temperature form) at about 950 °C during its reheating process.
Chemische Eigenschaften
white powder
Verwenden
Calcium phosphate is used in the production of phosphoric acid and fertilizers. It is used in baking as the acid in a leavening agent. It is also used in cheese products. This compound has also been used in gene transfection of cells. It is also being used in the development of contrast agents.
Verwenden
Calcium Pyrophosphate is a nutrient and dietary supplement that exists as a white odorless powder, insoluble in water. it is used in dental impression materials and as a buffer.
Definition
ChEBI: Calcium diphosphate is a calcium phosphate. It contains a diphosphate(4-).
Flammability and Explosibility
Non flammable

Dicalciumpyrophosphat Anbieter Lieferant Produzent Hersteller Vertrieb Händler.

7790-76-3, CALCIUM PYROPHOSPHATE Verwandte Suche:

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