氰氨化钙 Calcium Cyanamide

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1、CalciumcyanamideCalciumcyanamideIUPACnameCalciumcyanamideOthernamesCyanamidecalciumsalt,LimeNitrogen,UN1403,NitrolimeIdentifiersCASnumber156-62-7 YPubChem4685067ChemSpider10669887 YUNIIZLR270912W YECnumber205-861-8UNnumber1403RTECSnumberGS6000000·[Ca+2].N#

2、CN·InChI=1S/CH2N2.Ca/c2-1-3;/h2H2;/q;+2 YKey:STRTXDFFNXSZQB-UHFFFAOYSA-N YInChI=1/CH2N2.Ca/c2-1-3;/h2H2;/q;+2Key:STRTXDFFNXSZQB-UHFFFAOYAAPropertiesMolecularformulaCaCN2Molarmass80.102g/molAppearanceWhitesolid(Oftengrayorblackfromimpurities)OdorOdorlessDen

3、sity2.29g/cm3Meltingpoint1340°C[1]Boilingpoint1150-1200°C(sublim.)SolubilityinwaterReactsHazardsMSDSICSC1639EUIndex615-017-00-4EUclassificationHarmful(Xn)Irritant(Xi)R-phrasesR22R37R41S-phrases(S2)S22S26S36/37/39NFPA704FlashpointNon-flammableRelatedcompoun

4、dsRelatedcompoundsCyanamideCalciumcarbide YExceptwherenotedotherwise,dataaregivenformaterialsintheirstandardstate(at25 °C,100 kPa)CalciumcyanamideorCaCN2isacalciumcompoundusedasfertilizer,firstsynthesizedin1898byAdolphFrankandNikodemCaro(Frank-Caroprocess)

5、.Itisformedwhencalciumcarbidereactswithnitrogen.ItiscommerciallyknownasNitrolim.CaC2+N2→CaCN2+CThereactiontakesplaceinlargesteelchambers.Anelectriccarbonelementheatsthereactantstoredheat.Nitrogenispressurisedat2atmospheres.·Itcrystallizesinhexagonalcrystal

6、systemwithspacegroupR3mandlatticeconstantsa=3.67,c=14.85(.10−1nm).PreparationCalciumcyanamideispreparedfromcalciumcarbide.Thecarbidepowderisheatedatabout1,000°Cinanelectricfurnaceintowhichnitrogenispassedforseveralhours.Theproductiscooledtoambienttemperatu

7、resandanyunreactedcarbideisleachedoutcautiouslywithwater.CaC2+N2→CaCN2+C(ΔHƒ°=–69.0kcal/molat25°C)UsesThemainuseofcalciumcyanamideisinagricultureasafertilizer.Incontactwithwateritdecomposesandliberatesammonia:CaCN2+3H2O→2NH3+CaCO3Itwasusedtoproducesodiumcy

8、anidebyfusingwithsodiumcarbonate,whichwasusedincyanideprocessingoldmining:CaCN2+Na2CO3→2NaCN+CaO+O2Itcanalsobeusedinthepreparationofcalciumcyanideandmelamine.Throughhydrolysis,calciumcyanamideproducescyanamid