Get Natural Extracts Using Supercritical Carbon Dioxide PDF

By Mamata Mukhopadhyay

ISBN-10: 0849308194

ISBN-13: 9780849308192

Synthesizing study from a wide selection of assets, this paintings bargains a handy consultant to a fresh, secure, low-cost, non-toxic, non-polluting solvent that plays higher than most traditional solvents. usual Extracts utilizing Supercritical Carbon Dioxide stories contemporary improvement within the know-how and its functions to the nutrition, taste, perfume, and pharmaceutical industries. It outlines the various benefits the tactic has over conventional equipment like steam distillation, solvent extraction, and molecular distillation and it helps the preferred pattern towards using ordinary items in those industries.

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5 COSOLVENT EFFECTS A new dimension was added to SCFE when it was established that the solubilities in SCF could be greatly enhanced by the addition of small amounts (1 to 5 mol%) of a cosolvent or entrainer (Dobbs, 1986). The role of cosolvent in SCFE has been to increase the polarity and solvent strength while retaining the sensitivity of solubility with respect to pressure and temperature. 12a Selectivity of the components in various gases in an equimolar mixture of hexadecanol and octadecane (Brunner and Peter, 1982).

This suggests the possibility of separating the components at a lower pressure by a suitable process, synthesis-based on the crossover phenomenon as proposed by Chimowitz and Pennisi (1986). In general, nonpolar cosolvents increase the solubility of nonfunctional aromatic hydrocarbons, up to several hundred percent. , the longer the chain, the greater the enhancement. Also the greater the concentration of the cosolvent, the greater is the enhancement of the solubility. For a mixture of nonpolar solutes, the solubility enhancements with a nonpolar cosolvent are more or less similar and are relatively independent of density and accordingly no real improvement in selectivity can be achieved by temperature and pressure variations.

The solubility behavior of a solute in an SCF solvent is analyzed in terms of pressure, temperature, and cosolvent effects on solubility isotherms and isobars. 5 for a typical binary solid–fluid system, the solubility isotherms exhibit a remarkable pressure-dependent behavior. It can be seen that the solubility of a solid solute initially decreases, reaches a minimum, and then exponentially increases with pressure in the vicinity of the CP in the SCF state. The increase in solubility with further increase in pressure is less pronounced.

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Natural Extracts Using Supercritical Carbon Dioxide by Mamata Mukhopadhyay

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