Patent ID: 7089762

Claim:
A constant temperature distilling process, comprising the steps of implementing a drain-to-vacuum process using a degassed liquid to set a constant temperature distillation unit for vacuum distillation, or a constant temperature distillation unit for vacuum cooling to an initial state thereof; and setting a vacuum distilling temperature for said constant temperature distillation unit for a degassed solution therein to boil and evaporate at said set vacuum distilling temperature in said unit; such that an equilibrium thermal cycling between evaporation and condensation can be maintained throughout said constant temperature distillation unit, and evaporation heat and condensate produced in said constant temperature distilling process are recovered and collected, respectively; said constant temperature distillation unit for vacuum distillation including an evaporating vessel, and a liquid-gas interface provided in said evaporating vessel, into and out of which a hot circulating solution flows via corresponding conduits and control valves at a predetermined flow rate, and said hot circulating solution providing evaporation heat through a heat transfer at said liquid-gas interface to evaporate said degassed solution in said evaporating vessel; vacuumizing said conduits, said evaporating vessel, and said condenser through which said degassed solution, said vapors, or said condensed liquid flows, through implementing said drain-to-vacuum process using said degassed liquid to set said constant temperature distillation unit for vacuum distillation to an initial state; sealing said conduits, said evaporating vessel, and said condenser; closing said flow regulating valve; filling said vacuumized evaporating vessel with said degassed solution to a predetermined liquid level; and finally, setting the vacuum distilling temperature for said evaporating vessel; wherein said vacuum distilling temperature being lower than temperatures of said degassed solution and said hot circulating solution flown into said evaporating vessel and said liquid-gas interface, respectively.