Extração de oleo essencial de cravo-da-india em leito fixo com dioxido de carbono liquido suberitico

AUTOR(ES)
DATA DE PUBLICAÇÃO

1989

RESUMO

The extraction of clove oil with sub critical carbon dioxide (liquefied carbon dioxide at. pressures just below 72.3 kgf/cm2 and temperatures below 31.8°C) was studied. Apparatus was set up to operate with carbon dioxide at two different pressures (66 and 70 kgf/cm gauge ) and variable temperature. Grinde clove buds were packed into a fixed bed extractor (300 mm length; 7.1 mm inside diameter and 1.2 mm wall thickness). The extractor was conducted in a semi –continuous fashion. The size of the solid particles (mesh 48, 32, and 16) as well the temperature (10 up to 25°C) were varied to investigate the effects of these parameters on extraction yields and solubility of oil in carbon dioxide. A mass balance for the oil in the solvent and in the solid phases was written. The process was described as a superficial washing oil by the carbon dioxide any diffusional contribution on was neglected. The resulting equations were solved numerical using the method of characteristic and a computer program developed for a PC in FORTRAN 77. The mathematical model described quite well the process. The concentration profile were determined. A comparison between experimental data and the solution of the mass balance equations was used to determine the overall volumetric mass transfer coefficient. (0.80 to 1.20g/cm2s)

ASSUNTO(S)

plantas oleaginosas

ACESSO AO ARTIGO

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