Water demineralization processes

Water demineralization processes

In numerous applications of the industry pure water is needed: water use in boilers, laboratories, and, in many cases, water for pharmaceutical and textile industry, among others. It is considered pure water that is completely or almost free of minerals or dissolved solids. To obtain this pure water, demineralization process can be carried out. Demineralization is a process that is based on the elimination of inorganic ions present in water.

Some of water demineralization processes are:

Ion exchange resins. Mixed beds.

In KEIKEN we have the expertise to carry out a demineralization of water through ion exchange resins (mixed beds), which absorb and accumulate the ions contained even in the most diluted solutions. The composition of these resins varies depending on the final application and nature of the water to be treated and the success of the process lies there. Once the resins are exhausted and no longer reach the required quality, the automatic cleaning system regenerates the resins using acid and basic solutions to achieve the specifications marked by the project.

Demineralization by mixed beds provides ultrapure water to different systems and processes that industry needs. This technology is based on filters that are filled with acid cationic and anionic basic resins, which allows the ionic exchange with the salts found in the supply water. Ion exchange resins have the following characteristics:

• Cationic resin is composed of polymeric materials and full of negatively charged radicals, exchanging positive ions (cations). They can be cationic resins of weak or strong acid.

• Anionic resins are also composed of materials of polymeric nature and full of radicals with positive charge, exchanging ions with negative charge. They can be weak or strong base.

• Mixed beds use a combination of acidic cationic resins and basic anionic resins to carry out demineralization.

Reverse Osmosis (RO). One or two-stage.

It is a membrane-based demineralization technique. These membranes are selective semi-permeable barriers that allow the passage of water by diffusion, while dissolved substances, such as ions, are retained. It's one of the finer leaks that exists. These plants are supplied pre-mounted on a stand and can go containerised or not, depending on the needs of each project. At Keiken we have the experience and knowledge to give the customer the best option at the lowest cost.

Membrane Distillation

Keiken is fully involved in the development and marketing process of this technology. We trust that in the medium term and after a drop in the manufacturing costs of the membranes this technology could be widely used. It is a process in which the driving force is the vapor pressure gradient generated on both sides of a membrane between cold water and hot water, as seen in the figure. The membrane allows the separation of volatile matter from non-volatile matter and therefore is a process that rejects 100% of solids and non-volatile matter.

This technology is very versatile as far as application is concerned.

In KEIKEN we hybridize this process with Renewable Energies, which provides a reduction in operating costs and CO2 emissions associated with the process.

To request our Water Treatment and Demineralization services or more information, you can contact us by email info@keiken.es.