Desterpinação de oleo essencial de laranja por cromatografia preparativa de fluido supercritico

AUTOR(ES)
DATA DE PUBLICAÇÃO

1997

RESUMO

High pressure carbon dioxide extraction and preparative adsorption chromatography technologies have been combined for the deterpenation of orange essence oil obtained from a TASTE (Thermally Accelerated Short Time Evaporator) evaporator essence recovery system. A solid-liquid extraction pilot unit was designed and built to opperate in the absolute pressure and temperature ranges of 1 to 300 kgf/cm2 and 0 to 90°C respectively. Four experimental conditions were studied, where each condition corresponds to one adsorption and two extraction phases. Keeping the mass relationship between the oil and the adsorbent in 4,1 in all adsorption process and the second phase extraction in 17°C &150 kgf/cm2 as a constant, it was possible to study three first phase extraction in the supercritical fluid region (40°C &80 kgf/cm2; 40°C &90 kgf/cm2 and 40°C &120 kgf/cm2) and one first phase extraction in the supercritical liquid region (14 °C &80 kgf/cm2). From the total oxigenated compounds available in the orange essence oil, 83% was adsorbed in the silica gel packed bed. The extraction condition where the highest recovery in oxigenated compounds were found in both phases together was the one where the first phase occurred at 40°C &120 kgf/cm2 with a total recovery of 26.89 %. These data indicate that approximately 61 % of the total oxigenated compounds available in the original orange essence oil still remain in the column after the lowest selectivity condition, which means that the combined technologies should be improved either by the application of a modifier such as ethanol or by increasing the pressure or temperature in the second phase extraction, in this case, at the expenses of a lower product quality and higher operational costs.

ASSUNTO(S)

laranja enssencias e oleos essenciais adsorção dioxido de carbono

ACESSO AO ARTIGO

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