Regarding the difference between demineralized water and softened water
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Dear experts, in refineries or chemical plants, are demineralized water and softened water the same thing?~~~
Demineralized water is essentially softened water, used specifically for top-of-tower water injection, pump seal cooling, and air-cooling spray applications
Sometimes we confuse the two, but they are different. «Demineralized water refers to the finished water obtained by using various water treatment processes to remove impurities in water such as suspended solids, colloids, and inorganic cations and anions.» Desalinated water does not mean that all salts in the water have been completely removed; due to technical constraints and considerations related to production costs, trace impurities are allowed to be present in desalinated water depending on its intended use. The fewer impurities in the desalinated water, the higher its purity. Softened water is water that has been treated to have some or all of its calcium and magnesium ions removed. However, the total salt content in the water remained unchanged.
Softening water merely reduces the hardness of water to a certain level. During the softening process of water, only the hardness decreases, while the total salt content remains unchanged. Demineralized water not only reduces water hardness but also lowers the salts dissolved in it.
This post was last edited by mjl25mp6 on 2011-8-15 at 15:52: Lower hardness, same salt content? Aren’t the removed calcium and magnesium ions salts? What exactly is hardness, everyone? It’s just the content of calcium and magnesium salts, right! As for the difference between the two, it can be said that the different users determine the quality of water required. If the quality is the same, the two are identical; if the quality differs, the two are different ； In other words, even for demineralized water, the quality requirements can vary in two different locations; can you then call the water in those other locations something other than demineralized water? Studying mechanically and obsessively can kill you!
The views on the 3rd floor are already fairly clear; it also involves deoxygenated water, which is obtained by removing oxygen molecules from demineralized water to achieve a quality suitable for use in boilers. Deionized water has a better quality than softened water!
Demineralized water is of a higher quality than softened water, and it is also more expensive. Softened water simply removes ions with high hardness in water, such as Ca2+ and Mg2+. Deionized water is water from which various ions have been removed, and it is classified into primary deionized water, secondary deionized water, etc., depending on the degree of removal.
In softened water, there is generally no lack of chloride ions, as it passes through sodium ion exchange resins that replace calcium and magnesium ions with sodium ions; therefore, the salt content mentioned on the third floor does not change； Desalinated water, on the other hand, is water in which the vast majority of salts are removed through processes such as reverse osmosis, anion and cation exchange resins, and mixed-bed resins, thereby removing suspended solids as well as inorganic anions and cations. So the cost of desalinated water is much higher than that of softened water!
Desalinated water is simply softened water. I guess what you’re asking is about the difference between desalinated water and deoxygenated water. Desalinated water is water from which ions such as calcium and magnesium have been removed; after treatment with chemicals or through a thermal deaerator, it becomes deoxygenated water
Desalted water refers to the purified water obtained by using various water treatment processes to remove impurities in water such as suspended solids, colloids, and inorganic cations and anions. Desalinated water does not mean that all salts in the water have been completely removed; due to technical constraints and considerations related to production costs, trace impurities are allowed to be present in desalinated water depending on its intended use. The fewer impurities in the desalinated water, the higher its purity. Softened water: Water that has been softened, meaning water from which some or all of the calcium and magnesium ions have been removed. One removes only calcium and magnesium, while the other removes almost all of them