Calciumoxid
CaO · LIME · CAUSTIC · QUICKLIME · Calcium oxide powder · Calcination of calcium · CALX · cml21
Identifikatoren & physikalische Daten
| CAS No. | 1305-78-8 |
|---|---|
| Summenformel | CaO |
| Durchschnittliche Molmasse | 56,08 g/mol |
| SMILES | [O]=[Ca] |
| InChIKey | ODINCKMPIJJUCX-UHFFFAOYSA-N |
| PubChem CID | 14778 |
| ChEMBL | CHEMBL5314372 |
| ChEBI | CHEBI:31344 |
| EC No. | 215-138-9 |
| Lokaler Name | Calciumoxid |
Chemische & physikalische Eigenschaften
| Polarare Oberfläche (TPSA) | 17,1 |
|---|---|
| H-Brücken-Donoren | 0 |
| H-Brücken-Akzeptoren | 1 |
| Frei drehbare Bindungen | 0 |
| Schwere Atome | 2 |
| Formalladung | 0 |
| Komplexität | 2 |
| Stoffklassen | Other Classes -> BasesCorrosives |
| Kosmetika | Buffering |
| pH | SATURATED SOLN IN WATER IS ABOUT 12.812.6 (H2O, 20℃)(saturated solution) |
| SpringerMaterials Properties | thermal expansion coefficient |
| Pestizide | Agrochemicals -> Pesticide active substancesActive substance -> EU Pesticides database: Not approved |
| Geruch | Odorless |
| Lebensmittelzusatzstoffe | ANTICAKING AGENT OR FREE-FLOW AGENT, DOUGH STRENGTHENER, FIRMING AGENT, NUTRIENT SUPPLEMENT, PH CONTROL AGENT, PROCESSING AID, TEXTURIZER -> FDA Substance added to food |
| Dichte | 3.3 at 68 °F (USCG, 1999) - Denser than waterwill sink3.34 g/cu cmRelative density (water = 1): 3.3-3.43.37 @25 °C3.3 g/mL at 25 °C (lit.) |
| Color/Form | Grey-white, cubic crystalsColorless, cubic, white crystalsCrystals, white or grayish white lumps, or granular powderGreyish-yellow, hydroscopic lumps |
| Löslichkeit | Reacts with water (NIOSH, 2024)Slightly soluble in water. Insoluble in ethanol. Soluble in glycerolReacts with waterSoluble in water forming calcium hydroxide and generating large a quantity of heat.Soluble in acids, glycerol, sugar solutionpractically insoluble in alcohol1 g is sol in about 840 mL water and 1740 mL boiling water1.65g/l Risk of violent reaction. |
| Corrosivity | Corrosive |
| Flammpunkt | Not flammable2850°C |
| Schmelzpunkt | 2570 °C |
| Siedepunkt | 2850 °C (lit.) |
| Brechungsindex | 1.83 |
| Lagerbedingungen | no restrictions. |
| Aggregatzustand | powder |
| Farbe | White to yellow-very slightly beige |
| Wichte | 3.3 |
| Geruch | wh. or gray cryst. or powd., odorless |
| Spezifische Wärmekapazität | Cp(crystal): 0.75 J/(g·K), at 25℃ |
| Merck | 14,1686 |
| Dielektrizitätskonstante | 2.2(Ambient) |
| Stabilität | Stability Stable, but absorbs carbon dioxide from the air. Incompatible with water, moisture, fluorine, strong acids. |
| Kosmetik-Inhaltsstoffe Funktionen | BUFFERING |
| InChI | 1S/Ca.O |
| InChIKey | ODINCKMPIJJUCX-UHFFFAOYSA-N |
| SMILES | O=[Ca] |
| CAS Datenbank | 1305-78-8(CAS DataBase Reference) |
| NIST chemische Informationen | Calcium monoxide(1305-78-8) |
| EPA chemische Informationen | Calcium oxide (1305-78-8) |
Sicherheit & Vorschriften
| GHS-Einstufung | This chemical does not meet GHS hazard criteria for 5.1% (130 of 2552) of reports.DangerH302 (18.2%): Harmful if swallowed [Warning Acute toxicity, oral]P260, P261, P264, P264+P265, P270, P271, P280, P301+P317, P301+P330+P331, P302+P352, P302+P361+P354, P304+P340, P305+P354+P338, P316, P317, P319, P321, P330, P332+P317, P362+P364, P363, P403+P233, P405, and P501 (click each P-code to see the statement)Aggregated GHS information provided per 2552 reports by companies from 66 notifications to the ECHA C&L Inventory. Each notification may be associated with multiple companies.Not Classified |
|---|---|
| Regulatorische Informationen | Chemical: Calcium oxideCalcium oxide (CaO) is listed on the EPA's Chemical Data Reporting (CDR) system. Manufacturers and importers of Calcium oxide (CaO) are required to report information about their production and use of this chemical to the EPA under the Toxic Substances Control Act (TSCA). (40 eCFR Part 711)2002/2076Status: Cease Manufacture Update: 01-05-2018 https://echa.europa.eu/registration-dossier/-/registered-dossier/24348Calcium oxide: Does not have an individual approval but may be used under an appropriate group standardThe New Jersey Worker and Community Right to Know Act requires public and private employers to provide information about hazardous substances at their workplaces. (N.J.S.A. 34:5A-1 et. seq.) |
| Weitere Sicherheitsinformationen | IMAP assessments - Calcium oxide: Environment tier I assessment |
| DOT-Kennzeichnung | Corrosive |
| Brandgefahren | Excerpt from ERG Guide 157 [Substances - Toxic and/or Corrosive (Non-Combustible / Water-Sensitive)]:· Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive and/or toxic fumes.Not combustible. |
| Brandpotenzial | Not combustible, but bulk powder may heat spontaneously when damp with water. |
| Gesundheitsgefahren | Causes burns on mucous membrane and skin. Inhalation of dust causes sneezing. (USCG, 1999)· TOXIC and/or CORROSIVE |
Anwendungen & Verwendung
History
Calcium oxide dates from prehistoric times. It is produced by heating limestone to drive off carbon dioxide in a process called calcination: CaCO3(s) CaO(s) + CO2(g). At temperatures of several hundred degrees Celsius, the reaction is reversible and calcium oxide will react with atmospheric carbon dioxide to produce calcium carbonate. Efficient calcium oxide production is favored at temperatures in excess of 1,000°C. In prehistoric times limestone was heated in open fires to produce lime. Over time, lined pits and kilns were used to produce lime. Brick lime kilns were extensively built starting in the 17th century and the technology to produce lime has remained relatively constant since then.
Verwenden
Calcium Oxide is a general food additive consisting of white granules or powder of poor water solubility. it is obtained by heating limestone (calcium carbonate) in a furnace. it is also termed lime or quicklime. it is used as an anticaking agent, firming agent, and nutritive supple- ment in applications such as grain products and soft candy.