Artículos de revistas
Formação de carbamato de etila em aguardentes recém-destiladas: proposta para seu controle
Fecha
2011Registro en:
Química Nova, v.34, n.6, p.996-1000, 2011
0100-4042
10.1590/S0100-40422011000600016
Autor
GALINARO, Carlos Alexandre
FRANCO, Douglas Wagner
Institución
Resumen
The commercial sugar cane spits redistillation decreased up to 92,5% their ethyl carbamate (EC) original content. Quantitative analysis of EC in 15 samples of sugar cane spirit (alembic and column), fresh distilled and collected in situ demonstrated that the urethane is formed mostly after distillation. The average time to achieve the complete EC formation is independent of the diffuse light presence and of the distillation apparatus used. The k obs for urethane formation at 25 ºC was calculate as (3,3 ± 0,5) x 10-5/s and the activation parameters are: ΔH‡ 34 kcal/mol; ΔS‡ - 69 cal/mol K; and ΔG‡ 54 kcal/mol.