Two options for brine distillation? Coarse salt purification distilled distilled water is not salt

1) If only the salt is retained, then the water is directly evaporated with heated salt water, and the rest is the salt version; Or right to lower the temperature so that the solubility of the salt.

If the water is to be retained, the salt water will enter a supersaturated state, and salt crystals can be precipitated from the brine (2) If the water is to be retained, the salt and water can be separated by distillation.

Experimental process of seawater desalination by distillation.

Distillation. Although distillation is an ancient method, it is still dominant today due to the continuous improvement and development of technology. The essence of the distillation desalination process is water vapor.

The formation process of the original denier is like the evaporation of sea water to form clouds, and the clouds are cold under certain conditions to form rain, and the rain does not have a salty taste. According to the equipment distillation method, vapor compression distillation method, multi-stage flash distillation method, etc.

Reverse osmosis. Commonly known as ultrafiltration, it is a membrane separation desalination method that was only adopted in 1953. This method uses a semi-permeable membrane that only allows solvents to pass through and does not allow solutes to permeate.

It separates seawater from fresh water. Under normal circumstances, fresh water diffuses to the seawater side through a semi-permeable membrane, so that the liquid level on the seawater side gradually rises until a certain height does not stop, this process is called osmosis. At this time, the static pressure of the water column that rises on one side of the seawater is called osmotic pressure.

If an external pressure greater than the osmotic pressure of the seawater is applied to the seawater side, then the pure water in the seawater will reverse osmosis into the fresh water. The biggest advantage of the reverse osmosis method is energy saving. Its energy consumption is only 1 2 of that of electrodialysis and 1 40 of distillation.

Reverse osmosis desalination technology has developed rapidly, and the project cost and operating cost have continued to decrease, and the main development trend is to reduce the reverse osmosis membrane.

operating pressure to increase the rate of reverse osmosis system.

Cheap and efficient pretreatment technology to enhance the anti-pollution ability of the system, etc.

Solar Energy Act. In the early days of human beings, solar energy was used for seawater desalination, mainly using solar energy for distillation, so the early solar desalination devices were generally called solar distillers. Distillation SystemsAn example of a passive solar distillation system is the disc solar still, which has been used for nearly 150 years.

Due to its simple structure and convenient access, it is still widely used today. At present, the research on disc solar distillers mainly focuses on the selection of materials, the improvement of various thermal properties, and the use of disc solar retorts with various solar collectors. Compared with traditional power sources and heat sources, solar energy has the advantages of safety and environmental protection, and the combination of solar energy harvesting and desalination process is a sustainable development.

of seawater desalination technology. Solar desalination technology has gradually attracted attention due to the advantages of no conventional energy consumption, no pollution, and high purity of the freshwater obtained.

Distillation method to desalinate seawater how to use brine design experiments.

Take a beaker. A certain concentration of brine is placed in a beaker, the brine is transferred to a flask, and the distillation device is assembled for distillation and the distillate is received. The distillate is tested with a silver nitrate solution for chloride ions.

Method 1The density of distilled water and concentrated brine is different, and the density of concentrated brine is greater than that of distilled water. Use two same containers to take two liquids of a certain volume and weigh their mass, the larger mass is concentrated brine, and vice versa is distilled water.

Weighing and weighing must be very accurate, without too much error).

Method 2Take a certain amount of two liquids to evaporate and crystallize respectively, and the precipitation of white crystals is concentrated brine, and vice versa is distilled water.

Distillation is a commonly used method for separating and purifying liquid mixtures, and can also determine the boiling point of liquid compounds, so it has certain significance for the identification of pure liquid compounds. The commonly used distillation pack is assembled with a standard grinding instrument, and is composed of a round-bottom flask, a distillation head, a thermometer, a condenser tube, a receiving tube and a receiving flask. When assembling a distillation device with a common glass instrument, a distillation flask with a branch tube is usually used, and the glass instruments are connected by rubber stoppers.

Based on the difference in the volatility (boiling point) of two isotope molecules, isotope separation is achieved by heating a mixture of liquid isotopes. When the isotope mixture is heated and exists in both the gas-liquid phase, the volatile isotope molecules are more present in the gas phase, while the non-volatile isotope molecules are more present in the liquid phase. In this way, volatile isotopes are concentrated in the gas phase and less volatile isotopes are concentrated in the liquid phase.

For example, the boiling point of light water (H20) is 100 at atmospheric pressure, while heavy water is volatile, with more hydrogen in the gas phase and more deuterium in the liquid phase. This method is relatively simple in equipment and operation, but consumes more energyDistillation is still one of the main methods for separating light isotopes on an industrial scale, and the molecules of liquids have a tendency to overflow from the surface due to molecular movement.

This tendency increases with increasing temperature. If the liquid is placed in a closed vacuum system, the liquid molecules continue to overflow and form vapor at the upper part of the liquid surface, and finally the speed at which the molecules escape from the liquid is equal to the speed at which the molecules return to the liquid from the vapor, and the vapor maintains a certain pressure. At this time, the vapor on the liquid surface reaches saturation, which is called saturated vapor, and the pressure it exerts on the liquid surface is called saturated vapor pressure dissipation.

Experiments have proved that the saturation vapor pressure of a liquid is only related to temperature, that is, the liquid has a certain vapor pressure at a certain temperature. This refers to the pressure at which the liquid is in equilibrium with its vapors, independent of the absolute amount of liquids and vapors in the system.

When the vapor pressure of the liquid increases to the same level as the total pressure (usually atmospheric pressure) applied to the liquid surface, a large number of bubbles escape from the inside of the liquid, that is, the liquid boils, and the temperature at this time is called the boiling point of the liquid. Obviously, the boiling point is related to the amount of external pressure to which it is subjected. What is commonly referred to as the boiling point is the boiling temperature of a liquid under pressure.

For example, the boiling point of water is 100, which means that water boils at 100 under pressure. The boiling point at other pressures should indicate the pressure. For example, when water boils at 95, the boiling point of water can be expressed as 95.

The combination of heating a liquid to a boil to turn the liquid into vapor, and then cooling the vapor and condensing it into a liquid is called distillation. Obviously, distillation separates volatile and non-volatile substances, as well as liquid mixtures with different boiling points. However, the boiling points of the components of the liquid mixture must vary greatly (at least 30 or more) to obtain a good separation effect.

When distilling at atmospheric pressure, the observed boiling point should be strictly corrected because the atmospheric pressure is often not exactly the same, but since the deviation is generally small, even if the atmospheric pressure is different, this correction is only about 1 and is therefore negligible.

Analysis: Coarse salt purification and distilled water collection are a continuous process. The correct order of the calendar is selected as the pair. Rough sail salt contains substances that are insoluble in water.

First of all, the rotten dust must be dissolved and then filtered. The filtrate is then evaporated, and the evaporated water vapor is cooled by a condenser before collecting water. Solution a

Principle: The water in salt water or seawater evaporates and condenses into small water droplets on the plastic wrap, and the small water droplets gather into large water droplets under the action of neutrality and fall into a clean dish, in which fresh water can be collected.

The reason why the desert can not be solved in large quantities:

1. Deserts and generally not near the sea, water transportation costs 2. You also see that there is very little water in this small device mobile phone, which is a drop in the bucket; Even if you get a few more, there will be very little water collected; If it is converted to a large device, it will cost a lot of money.

3. The principle requires the evaporation of water, if you do not heat the treatment of the sun, the process is slower, and it takes time to finally, in fact, there are many kinds of projects to filter seawater to get the fresh water and salt we need, more than this small method, you can search on the Internet.

If it's so simple, what do you want such scientists to do, and the problems that so many scientists can't solve, you can solve them by putting a few more, hehe.