JPH04298281A - Vacuum distillation method for fresh water - Google Patents

Abstract

PURPOSE:To obtain fresh water (ultra-pure water) by noticing that a b. p. falls on dropping of the atm. pressure, heating the sea water or polluted water with a solar heat absorbing plate or electric heating plate to accelerate the generation of steam as the b.p. falls rapidly near the vacuum, sucking the steam with a vacuum pump, cooling the steam with a cooler and passing the water through an ion exchange resin in order to remove impurities. CONSTITUTION:The water is first sucked up by a water feed pump 1 and the sea water or polluted water deaerated by a deaerator 2 is put into a cylinder evacuated nearly to the vacuum. The water is then heated by the solar heat absorbing plate 3 or the electric heating plate 8, by which the temp. is raised. Since the b.p. is low, the water can instantaneously be evaporated. The generated steam is sucked by a vacuum pump 4 and is accumulated in a steam accumulator 5. The steam is cooled with the cooler 6. The fresh water (ultra-pure water) is obtd. if the impurities intruded into the water are removed by the ion exchange resin.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] This is a fresh water vacuum distillation method designed to turn seawater or polluted water into fresh water.

0002

[Prior Art] A solar energy absorbing pipe (
9), an evaporator (10) that evaporates heated water flowing out from the pipe (9) under reduced pressure, and a condensation recovery machine (15) that cools the steam generated in the evaporator and recovers it as condensed water. A water production device equipped with

0003

[Problems to be Solved by the Invention] However, the "water generator" is small in size and generates a small amount of water, but the present invention is a larger scale device that can continuously generate a large amount of water, and uses seawater instead of well water. It is unique in that it targets polluted water, and the fresh water vacuum distillation method can be used in both large and small scales, and even small scales can produce more water than tap water. Water can be generated using electric heating plates even in places where sunlight is hard to reach. The effect is particularly great in cold regions. It was invented to turn seawater or polluted water into fresh water by taking advantage of the fact that the boiling point of water drops rapidly when the temperature is close to a vacuum, and when the temperature is raised it evaporates instantaneously.

0004

[Means for solving the problem] The seawater and polluted water sucked up by the water supply pump are removed by a deaerator to remove air mixed in the seawater and polluted water, and the deaerated seawater and polluted water are put into the shell and the inside of the shell is removed. By placing it near a vacuum and heating it with a solar heat absorbing plate or electric heating plate, the boiling point has been lowered, so it can be instantly turned into water vapor, which is sucked up with a vacuum pump, stored in a steam reservoir, and cooled with a cooler. In order to remove impurities mixed into the water, fresh water is obtained by passing it through an ion exchange resin.

[0005]

[Effect] Seawater is 30℃ near vacuum (0.042 atm)
Therefore, if the temperature is set at 60°C at the same atmospheric pressure, seawater or polluted water will boil instantaneously, the water vapor will be absorbed by a vacuum pump, the steam will be stored in a steam reservoir, and the temperature will be lowered to about 10°C by a cooler to obtain water. Fresh water is obtained by passing it through an ion exchange resin to remove impurities. How to use it is to turn seawater and polluted water into fresh water.
The SI cleaning process requires a large amount of ultrapure water, which can also be used.

[0006]

[Example] The seawater and polluted water sucked up by the water supply pump 1 are removed by the deaerator 2, and the air mixed in the seawater and polluted water is removed. By heating it to 60°C using the solar heat absorbing plate 3 or electric heating plate 8 near the barometric pressure, the boiling point has been lowered, so it can be instantly converted to water vapor, which is then sucked up by the vacuum pump 4 and continuously released as steam. Fresh water (ultrapure water) is obtained by storing steam in a reservoir 5, cooling it with a cooler 6 (to 10° C.), and passing it through an ion exchange resin 7 to remove impurities mixed in the water. A drain cock 10 is provided since impurities are mixed into seawater and polluted water and residue accumulates therein. And the electric heating board has a temperature of 55
Set to ~65°C and automatically control.

[0007]

[Effects of the Invention] The present invention allows a large amount of seawater or polluted water to be easily converted into fresh water (ultra-pure water) regardless of whether it is small or large, and has many other utility values.

[Brief explanation of drawings]

FIG. 1 is a sectional view seen from the side.

FIG. 2 is a plan view seen from directly above.

FIG. 3 is a cross-sectional view of a conventional seawater to freshwater generator.

[Explanation of symbols]

1 Water supply pump 2　Deaerator 3. Solar heat absorption plate 4 Vacuum pump 5 Steam reservoir 6 Cooler 7 Ion exchange resin 8 Electric heating board 9 Fresh water storage tank 10 Drain cock 11 Thermometer 12 Vacuum pressure gauge

Claims (1)

[Claims] Claim 1: This is a method for extracting fresh water (ultra-pure water) from seawater or polluted water. By making the interior near a vacuum and heating it with a solar heat absorption plate and an electric heating plate, it becomes high temperature, and since the boiling point has been lowered, it can be evaporated instantly, and the water vapor is sucked up with a vacuum pump and stored in a steam reservoir for cooling. Fresh water (ultrapure water) can be obtained by cooling the water in a container and removing impurities mixed in with ion exchange resin. When seawater or polluted water evaporates, a residue (drainage) remains, but the electric heating plate can be raised to allow the drainage to be discharged.