The fluid entering the vacuum vessel is controlled by a solenoid valve which allows for a standing reservoir within the vessel. The fluid is exposed to heat and vacuum, while flowing in a thin film over baffled, slanted aluminum trays or while being drawn through cartridges. Dehydration, de- aeration and degasification are thus accomplished. The vapors are drawn from the vacuum vessel through a condenser. The condensed vapors settle in the distillate collection tank, which is drained periodically.
Temperature and vacuum are typically controlled to 70-75 degrees C and 750 mm of mercury. If an abnormal quantity of water or volatiles is encountered, temperature and vacuum sensors may signal a solenoid valve to divert the flow back into the system inlet for further processing, or the process may be slowed automatically by other means.
Creating a sufficient vacuum is critical to the success of the system, says Judith Allen, vice-president of Allen Filters. A good vacuum, even at moderate processing temperatures, will allow highly effective dewatering to ta ke place. In contrast, vacuum dehydrators using less suitable vacuum pumps may achieve effective dewatering only at very high processing temperature, or perhaps not at all.
Protecting a precision vacuum pump from water or condensate ingress is necessary to prevent internal corrosion and loss of oil film, Allen says. This oil film may serve as a sealing medium and is generally needed to produce a high vacuum.
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