Water demineralization: features and technology

The final product of most industrial enterprises (pharmacology, processing industry, etc.) cannot be produced without the most purified water. Enterprises must use high-quality purified liquid when processing products during production. One way or another, good and deep water purification directly affects the continuous cyclic production of products, and also increases the service life of equipment, protecting it from breakdowns.

For these purposes, the process of water demineralization is used, in which all mineral salts are removed from the liquid. There are four methods of demineralization in total - ion exchange, distillation, electrodialysis and reverse osmosis.

Demineralization uses the ion exchange method. Equipment designed for ion exchange of water works on the principle of absorption of cations and anions of particles dissolved in the liquid by the ion exchange resin. During ion exchange, treatment occurs in two layers of ion exchange material in order to achieve the maximum effect in removing all salts present in the water. In the process of deionization, cation exchange and anion exchange resins are used one after the other or simultaneously, since the composition of all salts soluble in water includes cations and anions. After that, they are completely replaced by a mixture of two resins with hydrogen ions H + and hydroxyl OH-. Then a chemical reaction occurs, during which they create a water molecule, completely desalting the liquid. The resin has a certain cycle, through which it is necessary to wash with special acids, which must then be destroyed using additional waste disposal facilities.

The process of distilling water involves distilling a liquid that evaporates and then cools. As a result, water vapor forms a condensate that settles in drops, similar to a kettle boiling. During boiling, water turns into steam and subsequently settles on the already cooled edge of the device. During distillation, foreign solid particles, salts and microorganisms are removed from the water, due to which the liquid is effectively purified from impurities. Distillation consumes a large amount of heat and electrical energy. The process of distilling water involves distilling a liquid that evaporates and then cools. As a result, water vapor forms a condensate that settles in drops, similar to a kettle boiling. During boiling, water turns into steam and subsequently settles on the already cooled edge of the device. During distillation, foreign solid particles, salts and microorganisms are removed from the water, due to which the liquid is effectively purified from impurities. Distillation consumes a large amount of heat and electrical energy.

One of the most common methods of water demineralization is purification using reverse osmosis units, which is recognized as the most highly professional. Initially, this method was used to desalinate seawater. Later, this technology, in combination with the filtration and ion exchange method, allowed to expand the range of possibilities for liquid purification. Reverse osmosis units operate on the principle of "passing" water through a thin-film semipermeable membrane, the pore size of which is so small that it allows only water and low-molecular gases (oxygen, carbon dioxide) to pass. As a result, such treatment purifies the liquid from all impurities that are retained on the membrane and then go into the drainage. The final product when using a reverse osmosis unit is distilled or highly desalinated water.

Unlike the ionization process, osmosis does not require strong acids. In addition, the reverse osmosis method has lower requirements for the quality of the source water compared to electroionization, since even tap water is suitable for it. In the case of electroionization, it is necessary to spend significantly more electricity, and the input limitation should be up to 1 MHO. However, reverse osmosis also has its drawback - the volume of water discharged into the drainage directly depends on the quality of the inlet water, so this process is permanent. When preparing liquid for demineralization, it is important to check that it does not contain chlorine or organochlorine compounds, since they can destroy the membrane material during the purification process. Fully demineralized water has a salt content of 20 mg / l, the value of its specific electrical resistance is in the range of 3-18 MHO * cm at an aqueous medium temperature of 20 ° C, the pH level should be in the range of 5-8, and the water hardness is 0.5-0-6 mg / l.

This article has considered the main methods of water demineralization of various levels and depths of purification.

To further maintain the desired demineralized indicator, our company offers to use Tank Vent CO2 (carbon dioxide) absorbers to avoid contact of demineralized water with carbon dioxide.

Carbon dioxide (CO2, carbon dioxide) is a chemical compound without any color or odor. Normally, carbon dioxide is always present in the air.

One of the most effective methods of cleaning the air from carbon dioxide is Adsorption. Adsorption is a system for cleaning from a pollutant based on molecular sieves. It is used, among other things, for fine cleaning of gas from carbon dioxide. A special sorbet M - sorbent is most often used as an adsorbent. The adsorbent is selected based on its adsorption capacity - how much substance a unit of mass of the adsorbent or its surface area can absorb.

Based on adsorption method, we design and produce Tank Vent CO2 (carbon dioxide) absorbers.

Tank Vent CO2 (carbon dioxide) absorbers which also named as Tank CO2 breather filters:

They have a number of advantages - low price, easy maintenance, high degree of purification and others.

Purpose of Tank Vent CO2 (carbon dioxide) absorbers:

Tank Vent CO2 (carbon dioxide) absorbers are suitable for different types of production. Most often it is used in such areas as:

• Food;
• Chemical;
• Petrochemical industry;
• Rubber production;
• Plastic production;
• On reservoirs;
• Small power plants;
• For semiconductor and pharmaceutical production, etc.

Tank Vent CO2 (carbon dioxide) absorbers are used to clean the air from carbon dioxide in tanks with clean water or at the outlet of a tank with chemical compounds (acids, reagents, salts).

In production facilities where clean water is used, it is required that during storage, it does not come into contact with organic compounds (for example, CO2). Otherwise, oxidation will occur. Read more about the features of gas purification from carbon dioxide in the article.