Pyrophosphorsure

Bezeichnung:Pyrophosphorsure

CAS-Nr2466-09-3

Englisch Name:Pyrophosphoric acid

CBNumberCB0740227

SummenformelH4O7P2

Molgewicht177.98

MOL-Datei2466-09-3.mol

Synonyma

Pyrophosphorsure

Pyrophosphorsure physikalisch-chemischer Eigenschaften

Schmelzpunkt	61 °C
Dichte	approximate 1.9g/ml (25℃)
storage temp.	-20°C, Hygroscopic
Löslichkeit	DMSO (Soluble)
pka	0.99±0.10(Predicted)
Aggregatzustand	white crystals
Farbe	white crystals, crystalline
PH	pKa1= 0.86, pKa2 = 1.76, pKa3 = 5.88, pKa4 = 8.14(25℃)
Wasserlöslichkeit	709g/100mL H2O (23°C); soluble alcohol, ether [MER06]
Merck	13,8098
Stabilität	Hygroscopic, Moisture Sensitive
InChIKey	XPPKVPWEQAFLFU-UHFFFAOYSA-N
CAS Datenbank	2466-09-3(CAS DataBase Reference)
EPA chemische Informationen	Diphosphoric acid (2466-09-3)

Sicherheit

Kennzeichnung gefährlicher	C
R-Sätze:	22-34
S-Sätze:	26-36/37/39-45
RIDADR	UN 3260 8/PG 2
WGK Germany	3
RTECS-Nr.	JL6672500
F	3-9-21
HazardClass	8
PackingGroup	III
HS Code	28092000

Gefahreninformationscode (GHS)

Pyrophosphoric acid Chemische Eigenschaften,Einsatz,Produktion Methoden

R-Sätze Betriebsanweisung:
R22:Gesundheitsschädlich beim Verschlucken.
R34:Verursacht Verätzungen.
S-Sätze Betriebsanweisung:
S26:Bei Berührung mit den Augen sofort gründlich mit Wasser abspülen und Arzt konsultieren.
S36/37/39:Bei der Arbeit geeignete Schutzkleidung,Schutzhandschuhe und Schutzbrille/Gesichtsschutz tragen.
S45:Bei Unfall oder Unwohlsein sofort Arzt zuziehen (wenn möglich, dieses Etikett vorzeigen).
Beschreibung
Pyrophosphoric acid, also known under the name diphosphoric acid, is colorless, odorless, hygroscopic and is soluble in water, diethyl ether and ethyl alcohol. It is produced from phosphoric acid by dehydration. Pyrophosphoric acid slowly hydrolyzes in the presence of water into phosphoric acid.
H4P2O7 +H2O?2H3PO4
Upon heating, phosphoric acid loses water, being converted successively, and to some extent concurrently, into the pyro- and meta-acids:
2H3PO4?H4P2O7 +H2O
nH3PO4?(HPO3)n + [H2O]n
Chemische Eigenschaften
White to very pale yellow glassy solid
Physikalische Eigenschaften
Colorless needles or liquid; hygroscopic. Crystallizes in two anhydrous forms: a metastable form melting at 54.3°C and a second and more stable form melting at 71.5°C; extremely soluble in cold water, reacting very slowly to form phosphoric acid; decomposing much faster in hot water; very soluble in alcohol and ether.
Verwenden
Pyrophosphoric Acid has been shown to enhance the rate of pyrophosphate hydrolysis by nonenzymatic catlysis and by inorganic pyrophoshatase. Pyrophosphoric Acid can be used for the preparation of vanadyl pyrophosphato methoxide cluster anion. Pyrophosphoric Acid is used in anion binding of inorganic phosphates due to is ability to form complexes.
Verwenden
Catalyst, manufacture of organic phosphate esters, metal treatment, stabilizer for organic per- oxides.
synthetische
According to early investigators, the pyro-acid is formed as low as 100 °C, and the conversion is complete between 255 and 260 °C. Phosphorous oxychloride reacts with phosphoric acid in the following manner:
5H3PO4 + POC13?3H4P2O7 + 3HC1
A mixture of the ortho- and meta-acids may be condensed together to form the pyro-acid by heating on the water bath:
nH3PO4 +[HPO3]n?[H4P2O7]n
Definition
ChEBI: An acyclic phosphorus acid anhydride obtained by condensation of two molecules of phosphoric acid.

Pyrophosphoric acid Upstream-Materialien And Downstream Produkte

Pyrophosphorsure Anbieter Lieferant Produzent Hersteller Vertrieb Händler.

2466-09-3, Pyrophosphoric acid Verwandte Suche:

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