2.1.2 Failure of Vacuum Distillation

2.1.2 Failure of Vacuum Distillation

Problem of Vacuum Distillation for not be Able to remove Water from Large Equipment

Vacuum Distillation works under principle of water boil and become vapor at 212 °F at atmospheric pressure or sea level. If Atmospheric pressure (14.6 psi) changes to 21 inch/Hg at 170 °F oil temperature, water will also boil and turn to vapor at this condition as well. Water will vaporize from Vacuum Chamber by Vacuum Pump (Liquid Ring Type) through Condenser and condenses into droplet of water from oil.

When dissolved water becomes vapor and rise to the top, oil will fall to the bottom of Vacuum Chamber. There is a gear pump to move the oil through a Solid Particle Filter.

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Vacuum Distillation Unit

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Vacuum Distillation can dehydrate dissolved water from oil and take perpetually to remove all water from oil reservoir. Because Vacuum Distillation draws Free Water from bottom of reservoir and dehydrate, then delivery the Still-Wet-Oil to top of oil reservoir. So this Vacuum Distillation is acting as the water mixer from bottom to top continuously.

Disadvantages of Conventional Vacuum Distillation

  1. Vacuum Distillation is unable to pull water from High Viscosity Oil of ISO 220 grade or heavier. There is not enough vacuum force to draw heavier oil into the Vacuum Chamber. So Vacuum Distillation does not work on High Viscosity Oil.
  2. Vacuum Distillation require high oil temperature to get more efficiency in water dehydration. Most user set oil temperature from 160 °F to 176 °F-185 °F in order to lower oil viscosity so vacuum pump can pull in the oil in vacuum chamber. However oil oxidation starts to rise when oil temperature exceeds 180 °F. Oil will become more rancid which is not good for lubrication.
  3. When water content is 1%-3% in the oil, there is excessive water will diminish Oil Surface Tension, thus, result in excessive Air Foaming from oil in the vacuum chamber. Air Foaming has negative effect on vacuum pump and condenser. Vacuum switch will automatically reduce vacuum from 21 inch/Hg to 16 inch/Hg in order to control air foaming. This lower vacuum will reduce more than 50% of water dehydration capacity of vacuum distillation, as well as shorten the vacuum pump life.
  4. There are Dissolved Gases decomposed and hidden in petroleum hydrocarbon which can release its Dissolved Gases from oil when there is enough heat and vacuum. These Dissolved Gases are hazardous and corrosive such as CH4 Methane, C2H2 Acetylene that will be drawn into vacuum pump and cause pump corrosion and shorten pump life. Most users didn’t know the cause of high maintenance in vacuum distillation.
  5. Each pass of vacuum distillation can only remove maximum of 1,000-2,000 ppm of water from oil (depending on oil temperature, viscosity and base quality). If there is more than 3,000 ppm of water, vacuum distillation can only remove Partial Water from each pass. The return discharge line will bring additional water after partial removal from bottom of oil reservoir to top of oil reservoir from discharge side. Then, vacuum distillation becomes a Water Mixer from bottom to top of oil reservoir while doing a multiple pass dehydration on equipment oil reservoir. This explains why water has never been taken out from oil reservoir from vacuum distillation after several months of dehydration.
  6. If there is more than 3% (30,000 ppm) of water in the oil, vacuum distillation is unable to dehydrate water from oil reservoir due the above reason in no. 5. Water problem in oil will always exist in the machine. This type of water dehydration doesn’t work for the excessive water content. However, this problem can be easily solved with OilPure Vacuum Jet Dehydration due to its unique design.
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Vacuum Distillation could run for several months and more water still in the oil reservoir because Vacuum Distillation is water mixer from bottom to top of oil reservoir. It’s a never ending process.

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The above information is based on our experiences with users and their comments who wishes the manufacturer can improve their products. Please review with good discretion.

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