Isenthalpic/isobaric flashes

An excellent review or LLE applications in the food industry is given by Hamm,17 Since solvent toxicity is a major consideration, supercritical solvents, such as CO, which are nomoxic and LLE from an aqueous leachate are two popalar means of deriling with this problem. Figure 7.8-11 is a cooceptual supercritical extraction flowsheet. Because Tc is much lower than either 7 or rB, the solvent (e.g., C02) simply is flashed from the solute by throttling (an isenthalpic process). Then the vapors are compressed (an isentropic process) and cooled (an isobaric step) to complete the solveni recycle. Usually, costs are determined by the compressor requirearerUs. Several potential applications of supercritical or near-critical solvents are discussed in more datail else where,... 

A similar condition exists when the pressure on a saturated liquid at its boiling point is suddenly released (as from a ruptured line). The quantity of liquid that can be quickly converted to vapor (i.e., flashed ) in this way is obtained readily by considering an isenthalpic expansion. Figure 11 gives a temperature-entropy diagram that includes two isobars (P2 > Pi) and an isenthalp If saturated liquid at... 

Once we obtain a JC-value at a given temperature and pressure, we can perform mass and energy balances include isothermal, isobaric and isenthalpic flashes. We can also use the ideal gas heat capacity of the vapor phase, heat of vaporization and heat of capacity of the liquid to represent the enthalpies of relevant vapor and liquid streams. 

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See also in sourсe #XX -- [ ]

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