Potassium ethyl xanthate
|Molar mass||160.30 g·mol−1|
|Appearance||Pale yellow powder|
|Melting point||225 to 226 °C (437 to 439 °F; 498 to 499 K)|
|Acidity (pKa)||approximately 1.6|
|R-phrases||R15 R21 R22 R29 R36 R38|
|S-phrases||S3 S9 S35 S36 S37 S38 S39 S16 S23 S51|
Except where noted otherwise, data is given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
|what is: / ?)(|
Potassium ethyl xanthate 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 properties
- CH3CH2OH + CS2 + KOH → CH3CH2OCS2K + H2O
Potassium ethyl xanthate is a pale yellow powder that is relatively 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.
Potassium ethyl xanthate is predominantly used in the mining industry as flotation agent for extraction of the ores of copper, nickel, and silver. 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.
- Report 5 (1995) p. 5
- This report gives a detailed procedure Charles C. Price and Gardner W. Stacy (1948). "p-nitrophenyl) sulfide". Org. Synth. 28: 82.; Coll. Vol. 3, p. 667
- Kathrin-Maria Roy "Xanthates" in Ullmann's Encyclopedia of Industrial Chemistry 2005, Wiley-VCH, Weinheim. doi:10.1002/14356007.a28 423
- One of several procedures using xanthate esters: Fabien Gagosz and Samir Z. Zard (1948). "A Xanthate-Transfer Approach to α-Trifluoromethylamines". Org. Synth. 84: 32.; Coll. Vol. 11, p. 212