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Praseodym

PRASEODYMIUM Struktur
7440-10-0
CAS-Nr.
7440-10-0
Bezeichnung:
Praseodym
Englisch Name:
PRASEODYMIUM
Synonyma:
PR000150;PR000200;PR007910;PR000210;PR000050;PR000100;PR005110;PR000230;PRASEODYMIUM;PRAESODYMIUM
CBNumber:
CB4156796
Summenformel:
Pr
Molgewicht:
140.91
MOL-Datei:
7440-10-0.mol

Praseodym Eigenschaften

Schmelzpunkt:
931 °C (lit.)
Siedepunkt:
3520 °C (lit.)
Dichte
6.71 g/mL at 25 °C (lit.)
storage temp. 
Flammables area
Aggregatzustand
powder
Farbe
White
Wichte
6.782
Widerstand (resistivity)
68 μΩ-cm, 20°C
Wasserl?slichkeit
Reacts with water.
Sensitive 
Air & Moisture Sensitive
Merck 
13,7797
Expositionsgrenzwerte
ACGIH: TWA 2 ppm; STEL 4 ppm
OSHA: TWA 2 ppm(5 mg/m3)
NIOSH: IDLH 25 ppm; TWA 2 ppm(5 mg/m3); STEL 4 ppm(10 mg/m3)
CAS Datenbank
7440-10-0(CAS DataBase Reference)
EPA chemische Informationen
Praseodymium (7440-10-0)
Sicherheit
  • Risiko- und Sicherheitserkl?rung
  • Gefahreninformationscode (GHS)
Kennzeichnung gef?hrlicher F,C
R-S?tze: 17-11-34
S-S?tze: 17-7/9-33-16-45-36/37/39-27-26-23
RIDADR  UN 3208 4.3/PG 1
WGK Germany  3
1-10
TSCA  Yes
HazardClass  8
PackingGroup  III
HS Code  28053090
Bildanzeige (GHS) GHS hazard pictogramsGHS hazard pictograms
Alarmwort Achtung
Gefahrenhinweise
Code Gefahrenhinweise Gefahrenklasse Abteilung Alarmwort Symbol P-Code
H250 Entzündet sich in Berührung mit Luft von selbst. Pyrophoric liquids; Pyrorophoric solids Category 1 Achtung GHS hazard pictogramssrc="/GHS02.jpg" width="20" height="20" /> P210, P222, P280, P302+P334,P370+P378, P422
H315 Verursacht Hautreizungen. Hautreizung Kategorie 2 Warnung GHS hazard pictogramssrc="/GHS07.jpg" width="20" height="20" /> P264, P280, P302+P352, P321,P332+P313, P362
H319 Verursacht schwere Augenreizung. Schwere Augenreizung Kategorie 2 Warnung GHS hazard pictogramssrc="/GHS07.jpg" width="20" height="20" /> P264, P280, P305+P351+P338,P337+P313P
H413 Kann für Wasserorganismen sch?dlich sein, mit langfristiger Wirkung. Langfristig (chronisch) gew?ssergef?hrdend Kategorie 4
Sicherheit
P210 Von Hitze, hei?en Oberfl?chen, Funken, offenen Flammen und anderen Zündquellenarten fernhalten. Nicht rauchen.
P231+P232 Unter inertem Gas handhaben. Vor Feuchtigkeit schützen.
P273 Freisetzung in die Umwelt vermeiden.
P302+P352 BEI BERüHRUNG MIT DER HAUT: Mit viel Wasser/... (Hersteller kann, falls zweckm??ig, ein Reinigungsmittel angeben oder, wenn Wasser eindeutig ungeeignet ist, ein alternatives Mittel empfehlen) waschen.
P305+P351+P338 BEI KONTAKT MIT DEN AUGEN: Einige Minuten lang behutsam mit Wasser spülen. Eventuell vorhandene Kontaktlinsen nach M?glichkeit entfernen. Weiter spülen.
P370+P378 Bei Brand: zum L?schen verwenden.

Praseodym Chemische Eigenschaften,Einsatz,Produktion Methoden

R-S?tze Betriebsanweisung:

R17:Selbstentzündlich an der Luft. Spontaneously flammable in air.
R11:Leichtentzündlich.

S-S?tze Betriebsanweisung:

S17:Von brennbaren Stoffen fernhalten.
S7/9:Beh?lter dicht geschlossen an einem gut gelüfteten Ort aufbewahren.
S33:Ma?nahmen gegen elektrostatische Aufladungen treffen.
S16:Von Zündquellen fernhalten - Nicht rauchen.

Chemische Eigenschaften

grey powder

Physikalische Eigenschaften

Praseodymium is a silvery-white, soft metal that is easily formed into various shapes. Whenthe pure metal is exposed to the air, a green oxide coating forms on its surface. To preventoxidation, praseodymium is usually kept in oil in a covered container.
Its melting point is 931°C, its boiling point is 3,520°C, and its density is 6.77g/cm3.

Isotopes

There are 45 isotopes of praseodymium. All are artificially produced and radioactivewith half-lives ranging from several hundred nanoseconds to 23.6 days. Only oneis stable (Pa-141), and it makes up 100% of the praseodymium found in the Earth’scrust.

Origin of Name

The name is derived from two Greek words, prasios and didymos, which together mean “green twins.”

Occurrence

Praseodymium is the 41st most abundant element on Earth and is found in the ores of monazite,cerite, bastnasite, and allanite along with other rare-earths. Praseodymium is also the stableisotope resulting from the process of fission of some other heavy elements, such as uranium.
Praseodymium is mainly found in monazite sands and bastnasite ores. The monazite sandscontain all of the rare-earths and are found in river sand in India and Brazil as well as inFlorida beach sand. A large deposit of bastnasite exists in California.
Praseodymium is separated from its ore and other rare-earths by a process called ionexchange, which exchanges one type of ion for another.

History

In 1879, Lecoq de Boisbaudran isolated a new earth, samaria, from didymia obtained from the mineral samarskite. Six years later, in 1885, von Welsbach separated didymia into two others, praseodymia and neodymia, which gave salts of different colors. As with other rare earths, compounds of these elements in solution have distinctive sharp spectral absorption bands or lines, some of which are only a few Angstroms wide. Praseodymium occurs along with other rare-earth elements in a variety of minerals. Monazite and bastnasite are the two principal commercial sources of the rare-earth metals. Ion-exchange and solvent extraction techniques have led to much easier isolation of the rare earths and the cost has dropped greatly. Thirty-seven isotopes and isomers are now recognized. Praseodymium can be prepared by several methods, such as by calcium reduction of the anhydrous chloride or fluoride. Misch metal, used in making cigarette lighters, contains about 5% praseodymium metal. Praseodymium is soft, silvery, malleable, and ductile. It was prepared in relatively pure form in 1931. It is somewhat more resistant to corrosion in air than europium, lanthanum, cerium, or neodymium, but it does develop a green oxide coating that splits off when exposed to air. As with other rare-earth metals it should be kept under a light mineral oil or sealed in plastic. The rare-earth oxides, including Pr2O3, are among the most refractory substances known. Along with other rare earths, it is widely used as a core material for carbon arcs used by the motion picture industry for studio lighting and projection. Salts of praseodymium are used to color glasses and enamels; when mixed with certain other materials, praseodymium produces an intense and unusually clean yellow color in glass. Didymium glass, of which praseodymium is a component, is a colorant for welder’s goggles. The metal (99.9% pure) is priced at about $4/g.

Charakteristisch

As a metal, Pr is hygroscopic (adsorbs water) and tarnishes in the atmosphere. It will reactwith water to liberate hydrogen. It is soluble in acids and forms greenish salts, along with someother rare-earths. It is used to fabricate the electrodes for high-intensity lights.

Verwenden

Praseodymium salts, ingredient of mischmetal, core material for carbon arcs, colorant in glazes and glasses, catalyst, phosphors, lasers.

synthetische

Praesodymium may be recovered from its minerals monazite and bastanasite. The didymia extract of rare earth minerals is a mixture of praesodymia and neodymia, primarily oxides of praesodymium and neodymium. Several methods are known for isolation of rare earths. These are applicable to all rare earths including praesodymium. They include solvent extractions,ionexchange, and fractional crystallization. While the first two methods form easy and rapid separation of rare earth metals, fractional crystallization is more tedious. Extractions and separations of rare earths have been discussed in detail earlier (see Neodymium and Cerium).
Praesodymium metal can be obtained from its anhydrous halides by reduction with calcium. The metal also may be prepared by electrolysis of fused praesodymium chloride at elevated temperatures (about 1,000°C).Alternatively, an eutectic mixture of praesodymium chloride, potassium chloride, and sodium chloride may be electrolyzed. In such electrolysis graphite is the anode and tungsten the cathode.

Definition

A soft ductile malleable silvery element of the lanthanoid series of metals. It occurs in association with other lanthanoids. Praseodymium is used in several alloys, as a catalyst, and in enamel and yellow glass for eye protection. Symbol: Pr; m.p. 931°C; b.p. 3512°C; r.d. 6.773 (20°C); p.n. 59; r.a.m. 140.91.

Hazard

If praseodymium gets wet or is submerged in water, the hydrogen released may explode. Itmust be kept dry and protected from the atmosphere.

Praseodym Upstream-Materialien And Downstream Produkte

Upstream-Materialien

Downstream Produkte


Praseodym Anbieter Lieferant Produzent Hersteller Vertrieb H?ndler.

Global( 156)Lieferanten
Firmenname Telefon E-Mail Land Produktkatalog Edge Rate
Hubei Jusheng Technology Co.,Ltd.
18871490254
linda@hubeijusheng.com CHINA 28172 58
Hefei TNJ Chemical Industry Co.,Ltd.
+86-0551-65418671 +8618949823763
sales@tnjchem.com China 34553 58
Shaanxi Dideu Medichem Co. Ltd
+86-029-89586680 +86-18192503167
1026@dideu.com China 7724 58
Dorne Chemical Technology co. LTD
+86-86-13583358881 +8618560316533
Ethan@dornechem.com China 3106 58
Dayang Chem (Hangzhou) Co.,Ltd.
571-88938639 +8617705817739
info@dycnchem.com China 52849 58
Zhuoer Chemical Co., Ltd
02120970332; +8613524231522
sales@zhuoerchem.com China 2904 58
Henan Alfa Chemical Co., Ltd
+86-18339805032; +8618339805032
alfa4@alfachem.cn China 13227 58
Alfa Chemistry

Info@alfa-chemistry.com United States 24072 58
LEAP CHEM CO., LTD.
+86-852-30606658
market18@leapchem.com China 24727 58
PT CHEM GROUP LIMITED

peter68@ptchemgroup.com China 35425 58

7440-10-0(Praseodym)Verwandte Suche:


  • PRASEODYMIUM PLASMA EMISSION STANDARD
  • PRASEODYMIUM, PLASMA STANDARD SOLUTION
  • PRASEODYMIUM SINGLE ELEMENT STANDARD
  • PRASEODYMIUM STANDARD
  • PRASEODYMIUM, POWDER, -40 MESH, 99.9%
  • PRASEODYMIUM, INGOT, 99.9%
  • PRASEODYMIUM, FOIL, 0.25MM THICK, 99.9%
  • PRASEODYMIUM, CHIP, 99.9%
  • Praseodymium, foil, 0.25 mm thick, 99.90%
  • Praseodymium, ingot, 99.90%
  • Praseodymium, powder, 40 mesh, 99.90%
  • Praseodymiumchips(99.9%REO)
  • Praseodymium,99.9%,foil, 0.25 mm thick
  • Praseodymium,99.9%,chip
  • Praseodymium powder, -325 mesh, 99.9% (REO)
  • Praseodymium, plasma standard solution, Specpure, Pr 1000mug/ml
  • Praseodymium Powder
  • Praseodymium Chips
  • Praseodymium Pieces
  • Praseodymium Foil
  • Praseodymium rod
  • Praseodymium, Powder 250 Micron 99.9%
  • PraseodyMiuM powder, -200 Mesh, 99.9% (REO)
  • PraseodyMiuM foil, 0.62MM (0.024in) thick, 99.5% (REO)
  • PraseodyMiuM foil, 0.25MM (0.01in) thick, 99.5% (REO)
  • PraseodyMiuM rod, 6.35MM (0.25in) dia, 99.1% (Metals basis excluding Ta)
  • PraseodyMiuM rod, 12.7MM (0.5in) dia, 99.5% (Metals basis excluding Ta)
  • PraseodyMiuM, 99.9%, (trace Metal basis), chip
  • Praseodymium Ingot (Reo)
  • PR000150
  • PR000200
  • Praseodymiumfoil(99.9%REO)
  • Praseodymiumpowder(99.9%REO)
  • Praseodymium, Powder 40 Mesh
  • Praseodymium, Powder 250 Micron
  • Praseodymium, plasma standard solution, Specpure(R), Pr 10,000μg/ml
  • Praseodymium, plasma standard solution, Specpure(R), Pr 1000μg/ml
  • Praseodymium, AAS standard solution, Specpure(R), Pr 1000μg/ml
  • PRASEODYMIUM CHIPS: 99.9%, 3N (REO)
  • PRASEODYMIUM INGOT: 99.9%, 3N (REO)
  • PRASEODYMIUM FOIL: 99.9% UMF JM, 3N (REO)
  • PRASEODYMIUM POWDER: 99.9%, 3N (REO)
  • PRASEODYMIUM FOIL: 99.9%, 3N (REO)
  • PRASEODYMIUM: 99.9%, VACUUM REMELTS
  • PRASEODYMIUM, 99.9%, INGOT
  • PRASEODYMIUM, 99.90%, FOIL, 0.25 MM THICK
  • PRASEODYMIUM, 99.90%, CHIP
  • PRASEODYMIUM, 99.9%, POWDER, 40 MESH
  • Praseodymium, foil, 0.25 mm thick
  • Praseodymium, chip
  • Praseodymium, ingot
  • PR007910
  • PR000210
  • PR000050
  • PR000100
  • PR005110
  • PR000230
  • Praseodymium foil50x50mm
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