Calciumsulfid
Baumol · Oldhamite · C.I. 77245 · thioxocalcium · CALCIUM SULFIDE · Pigment White 9 · Calcium-sulphide- · calciumsulfide(cas)
Identifikatoren & physikalische Daten
| CAS No. | 20548-54-3 |
|---|---|
| Summenformel | CaS |
| Durchschnittliche Molmasse | 72,15 g/mol |
| Monoisotopische Masse | 71,934662 g/mol |
| SMILES | [Ca+2].[S-2] |
| InChIKey | AGVJBLHVMNHENQ-UHFFFAOYSA-N |
| PubChem CID | 10197613 |
| ChEBI | CHEBI:81055 |
| EC No. | 243-873-5 |
| DTXSID | DTXSID30885140 |
| Lokaler Name | Calciumsulfid |
Chemische & physikalische Eigenschaften
| Polarare Oberfläche (TPSA) | 1 |
|---|---|
| H-Brücken-Donoren | 0 |
| H-Brücken-Akzeptoren | 1 |
| Frei drehbare Bindungen | 0 |
| Schwere Atome | 2 |
| Formalladung | 0 |
| Komplexität | 0 |
| Stoffklassen | Metals -> Metals, Inorganic Compounds |
| Kosmetika | Depilatory |
| SpringerMaterials Properties | thermal expansion coefficient |
| Dichte | 2.58 @25 °C2.6 |
| Schmelzpunkt | 2524 °C2000 °C |
| Physical Description | White solid when pureCrude and luminous forms may be yellowish to pale-greyOdor of hydrogen sulfide in moist air[Merck Index] Colorless powder with an odor of rotten eggs[Alfa Aesar MSDS] |
| Brechungsindex | 2.12 |
| Löslichkeit | slightly soluble in H2Oinsoluble in ethanolSlightly soluble in water. Insoluble in alcohol. |
| Aggregatzustand | Powder |
| Wichte | 2.5 |
| Farbe | White |
| Spezifische Wärmekapazität | Cp(crystal): 0.65 J/(g·K), at 25℃ |
| Merck | 14,1707 |
| Kosmetik-Inhaltsstoffe Funktionen | DEPILATORY |
| InChI | 1S/Ca.S |
| InChIKey | JGIATAMCQXIDNZ-UHFFFAOYSA-N |
| SMILES | S=[Ca] |
| CAS Datenbank | 20548-54-3(CAS DataBase Reference) |
| EPA chemische Informationen | Calcium sulfide (CaS) (20548-54-3) |
Sicherheit & Vorschriften
| GHS-Einstufung | WarningH315: Causes skin irritation [Warning Skin corrosion/irritation]P261, P264, P264+P265, P271, P273, P280, P302+P352, P304+P340, P305+P351+P338, P319, P321, P332+P317, P337+P317, P362+P364, P391, P403+P233, P405, and P501 (click each P-code to see the statement)DangerH228 (54.9%): Flammable solid [Danger Flammable solids]P210, P240, P241, P261, P264, P264+P265, P271, P273, P280, P302+P352, P304+P340, P305+P351+P338, P319, P321, P332+P317, P337+P317, P362+P364, P370+P378, P391, P403+P233, P405, and P501 (click each P-code to see the statement) |
|---|---|
| Regulatorische Informationen | Chemical: Calcium sulfide (CaS)Calcium sulphide: Does not have an individual approval but may be used under an appropriate group standard |
| Weitere Sicherheitsinformationen | IMAP assessments - Soluble Sulfide Salts: Human health tier II assessment |
| Gefahrenübersicht | Oxidizes in dry air and decomposes in moist air[Merck Index] Decomposed by waterA skin and strong eye irritant[Alfa Aesar MSDS] |
| Hazard Classes and Categories | Flam. Sol. 1 (54.9%)Hazardous to the aquatic environment (acute) - category 1STOT SE 3 |
| Protective Action Criteria (PAC) | 1.2 [mg/m3]13 [mg/m3]79 [mg/m3] |
| Wassergefährdungsklasse (WGK) | 2 |
| TSCA-Inventar-Status | TSCA listed |
| UN-Transportnummer | UN 3179 4.1/PG 2 |
| R-Sätze (R) | 31-36/37/38-50 |
| Gefahrensymbole | Xi,N |
| Sicherheitshinweise (S) | 28-61 |
| Gefahrenklasse | 4.3Aquatic Acute 1Eye Irrit. 2Flam. Sol. 1Skin Irrit. 2STOT SE 3 |
Anwendungen & Verwendung
Occurrence
Calcium sulfide occurs in nature as the mineral oldhamite. It has several applications. The ‘luminous’ calcium sulfide is used in phosphors, luminous paints and varnishes. Calcium sulfide also is used as an additive to lubri cants; and as a flotation agent in ore extraction.
Verwenden
CALCIUM SULFIDE is used in electron emitters. Luminous CaS used for making luminous paints or varnishes.
Herstellung & Synthese
synthetische
Calcium sulfide can be prepared by the direct reaction of the elements, calcined in an inert atmosphere, at a 1:1.05 molecular ratio: Ca＋S＋heat→CaS This white material crystallizes in a cubic structurelike rock salt and the bonding is highly ionic. This is consistent with its description as an ionic solid. CaS can also be produced by the “carbothermic reduction” of calcium sulfate, which entails the conversion of carbon, usually as charcoal, to CO2: CaSO4＋ 2C→CaS＋ 2CO2 This can react further: 3CaSO4＋ CaS→4CaO＋ 4SO2 Thus, this type of preparation cannot be used to prepare a pure CaS salt. Calcium sulfide is available commercially as the pure sulfide as well as the polysulfide due to its extensive usage in the past as an insecticide both agriculturally and in home gardens.