【Daily Question】Chemical Engineering Principles 266: Chemical Desalination (December 17)
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This post was last edited by “Back to Cambridge” on December 24, 2015, at 13:46. Starting today, the Chemical Engineering Theory section is launching the “Question of the Day” activity, aimed at helping everyone reinforce their basic knowledge in chemical engineering. Subsequently, series such as “Fundamentals of Chemical Engineering”, “Mass Transfer and Separation”, “Chemical Thermodynamics”, and “Chemical Process Technology” will also be introduced. We hope for your active participation! For the “Question of the Day” activity, answers can be viewed directly in the replies; however, the thread will be closed after one day ! You get 2 wealth points for participating, and an additional 4 wealth points for answering correctly~~~ Short answer question: What is the chemical desalination of water? Using H-type cation exchangers to exchange with various cations in water, releasing H- ； While OH-type anion exchangers exchange with various anions in water, releasing OH-. In this way, after the water passes through these cation and anion exchangers, various salts in the water are essentially removed. This method is known as the chemical desalination of water.
Using H-type cation exchangers to exchange with various cations in water, releasing H-； While OH-type anion exchangers exchange with various anions in water, releasing OH-. In this way, after the water passes through these cation and anion exchangers, various salts in the water are essentially removed. This method is known as the chemical desalination of water.
What is the chemical desalination of water? Remove salt ions using ion exchange resin
After being treated by cation and anion exchangers, water has most of its various salts removed, and this water treatment method is known as chemical desalination.
It removes almost all the salts from water. For this purpose, cation and anion exchange technologies have developed rapidly. For example, H-type cation exchangers are used to exchange various cations in water, releasing H in the process+； OH-type anion exchangers are used to exchange various anions in water, releasing OH- in the process. In this way, after the water passes through these anion and cation exchangers, most of the salts present in the water are removed. This method is known as chemical desalination of water.
Boiler feed water requires that the salts in the water be almost completely removed. To this end, H-type cation exchangers are used to exchange with various cations in water, releasing H+; while OH-type anion exchangers are used to exchange with various anions in water, releasing OH-. In this way, after the water passes through these cation and anion exchangers, various salts in the water are essentially removed. This method is known as the chemical desalination of water.
If an H-type cation exchanger is used to exchange various cations in water, H is released+； While OH-type anion exchangers exchange with various anions in water, releasing OH-. In this way, after the water passes through these cation and anion exchangers, various salts in the water are essentially removed. This method is known as the chemical desalination of water.
Using H-type cation exchangers to exchange with various cations in water, releasing H+； While OH-type anion exchangers exchange with various anions in water, releasing OH-. In this way, after the water passes through these cation and anion exchangers, various salts in the water are essentially removed. This method is known as the chemical desalination of water.
Chemical desalination: The process of treating water by using anion and cation exchange resins to remove various salts present in the water is called chemical desalination
The full name of the chemical desalination method using water is cation-anion exchange chemical desalination. In this method, H-type cation exchangers are used to replace various cations in water with H+, while OH-type anion exchangers are used to replace various anions in water with OH-. As a result, after passing through these two types of exchange processes, all salts in the water can be removed.
Due to the rapid development of boilers toward higher temperatures and pressures in recent years, the requirements for the quality of boiler make-up water have also increased, necessitating the removal of almost all salts from the water. For this reason, anion and cation exchange technologies have developed rapidly. When an H-type cation exchanger is used, it exchanges with various cations in water, releasing H+; whereas when an OH-type anion exchanger is used, it exchanges with various anions in water, releasing OH-. In this way, after the water passes through these cation and anion exchangers, various salts in the water are essentially removed. This method is known as the chemical desalination of water.