| 词条 | Potassium ethyl xanthate |
| 释义 |
| Watchedfields = changed | verifiedrevid = 444062584 | Name = Potassium ethyl xanthate | ImageFile = Potassium_ethyl_xanthate.png | ImageSize = | ImageName = | ImageFile1 = Potassium ethyl xanthate 3D ball.png | ImageAlt1 = Ball-and-stick model of the component ions of potassium ethyl xanthate | IUPACName = potassium O-ethylcarbonodithioate | OtherNames = potassium ethylxanthogenate potassium-O-ethyl dithiocarbonate |Section1={{Chembox Identifiers | CASNo = 140-89-6 | CASNo_Ref = {{cascite|correct|CAS}} | CASNoOther = | MeSHName = | PubChem = 2735045 | ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}} | ChemSpiderID = 8491 | StdInChI_Ref = {{stdinchicite|correct|chemspider}} | StdInChI = 1S/C3H6OS2.K/c1-2-4-3(5)6;/h2H2,1H3,(H,5,6);/q;+1/p-1 | SMILES = [K+].[S-]C(=S)OCC | InChI = 1S/C3H6OS2.K/c1-2-4-3(5)6;/h2H2,1H3,(H,5,6);/q;+1/p-1 | StdInChIKey_Ref = {{stdinchicite|correct|chemspider}} | StdInChIKey = JCBJVAJGLKENNC-UHFFFAOYSA-M }} |Section2={{Chembox Properties | C=3 | H=5 | O=1 | S=2 | K=1 | Appearance = Pale yellow powder | Density = 1.263 g/cm3[1] | MeltingPtC = 225 to 226 | MeltingPt_notes = | BoilingPt = decomposes | Solubility = | pKa = approximately 1.6 | pKb = }} |Section7={{Chembox Hazards | MainHazards = | FlashPt = | AutoignitionPt = | RPhrases = {{R15}} {{R21}} {{R22}} {{R29}} {{R36}} {{R38}} | SPhrases = {{S3}} {{S9}} {{S35}} {{S36}} {{S37}} {{S38}} {{S39}} {{S16}} {{S23}} {{S51}} }} }} Potassium ethyl xanthate (KEX) is an organosulfur compound with the chemical formula CH3CH2OCS2K. It is a pale yellow powder that is used in the mining industry for the separation of ores. Unlike the related sodium ethyl xanthate, the potassium salt exists as an anhydrous salt. Production and propertiesXanthate salts are prepared by the action of alkoxides on carbon disulfide. The alkoxide is often generated in situ from potassium hydroxide:[2]CH3CH2OH + CS2 + KOH → CH3CH2OCS2K + H2O Potassium ethyl xanthate is a pale yellow powder that is stable at high pH but rapidly hydrolyses at pH <9 at 25 °C. Unlike the sodium derivative, potassium xanthate crystallizes as the anhydrous salt and is nonhygroscopic. ApplicationsPotassium ethyl xanthate is used in the mining industry as flotation agent for extraction of the ores of copper, nickel, and silver.[3] The method exploits the affinity of these "soft" metals for the organosulfur ligand. Potassium xanthate is a useful reagent for preparing xanthate esters from alkyl and aryl halides. The resulting xanthate estes are useful intermediates in organic synthesis.[3] SafetyThe LD50 is 683 mg/kg (oral, rats) for potassium ethyl xanthate.[4] References1. ^Report 5 (1995) p. 5 2. ^This report gives a detailed procedure {{OrgSynth|author=Charles C. Price and Gardner W. Stacy|year=1948|title=p-nitrophenyl) sulfide| volume =28|pages=82|collvol=3|collvolpages=667|prep=CV3P0667}} 3. ^One of several procedures using xanthate esters: {{OrgSynth|author=Fabien Gagosz and Samir Z. Zard|year=1948|title=A Xanthate-Transfer Approach to α-Trifluoromethylamines |volume=84|pages=32|collvol=11|collvolpages=212|prep=V84P0032}} 4. ^1 {{cite encyclopedia|author=Kathrin-Maria Roy|title=Xanthates|encyclopedia=Ullmann's Encyclopedia of Industrial Chemistry|year=2005|publisher= Wiley-VCH|location=Weinheim|doi=10.1002/14356007.a28_423}} 3 : Potassium compounds|Thiocarbonyl compounds|Metallurgical processes |
| 随便看 |
|
开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。