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Development Prospect of Membrane Separation Technology

Post Time:Apr 17,2019Classify:Company NewsView:988

Many people may not understand what membrane separation technology is. Modern membrane technology can make seawater into fresh water, and make sewage into clean water. It has become a magical and widely used high-tech. The human understanding of membranes has a long history. As early as the mid-18th century, it was found that there were semi-permeable membranes (hereinafter referred to as separation membranes) in nature. Later, it was further recognized that semipermeable membranes existed widely in human body and various animals and plants.


After food and water enter the human body and are digested, harmful substances are quickly separated from the human body separation membrane, and beneficial substances such as oxygen, protein, fat, inorganic salts are melted into the blood and transfused to various parts of the body. Therefore, the human body's metabolic process is a membrane process. After entering the 20th century, people began to study the membrane process systematically. So what is membrane separation technology? What is its principle?


The so-called "membrane" is actually an organic macromolecule or inorganic material with special selective separation function. It can separate liquids into two separate parts, so that one or several substances can pass through, and other substances can be separated. At present, commercialized membranes include acetic acid fibers, polysulfone, polyamide, polypropylene, polytetrafluoroethylene, polyester, porous aluminium membranes, ceramic membranes and metal composite membranes. Membrane separation mechanism is either based on the different molecular sizes of permeates (sieving effect), or on the difference of charges of separated substances (electrochemical effect), or on the physicochemical characteristics of separated substances (solubility effect). When separating solution with diaphragm, the method of making solute pass through membrane is called dialysis, and the method of making solvent pass through membrane is called permeation. The driving force of solute or solvent passing through the membrane is electromotive force, concentration difference or pressure difference, etc.


Ultrafiltration, for example, prevents macromolecule substances and colloidal substances from penetrating through semi-permeable membranes, while water and low molecular substances penetrate through membranes, which is quite similar to the membrane process in human body. Electrodialysis uses ion exchange membranes to orientate ions in water under the action of an applied electric field and selectively exchanges ions with different charges. Membrane, so as to achieve the separation of solutes and solvents. When it is used in seawater desalination, all kinds of salts in seawater can be separated from water under the drive of electric field, and finally fresh water can be obtained.


From this point of view, the development prospect of membrane separation technology is still considerable. More information about glass furnace construction and design services can be accessed to our official website for detailed consultation.


Source: http://www.bsglass.cnAuthor: http://www.bsglass.cn

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