The application of membrane technology in industrial production and daily life is increasingly widespread, but also highlights its important role and bright prospects. Its main difference from traditional filtration techniques is that the membrane can be separated on a molecular scale and the process is a physical process with no phase change and no need to add auxiliaries. Membrane pore size is generally nanometer, according to the different pore size (or referred to as the molecular weight cut off), the membrane can be divided into microfiltration membrane, ultrafiltration membrane, nanofiltration membrane and reverse osmosis membrane; according to the different structures, can be divided into Roll membrane, tubular membrane, hollow fiber membrane, flat membrane. Due to the characteristics of application cost and separation accuracy, the roll film is currently used most widely, bringing breakthrough improvements to production technology and processes.
In order to apply membrane technology to more industries and production processes, the application environment for membranes is becoming more and more demanding, and the performance requirements for membranes are getting higher and higher, which means that developers need to develop more new membranes. Material or modified original membrane material.
During the research and development of new membranes or modification of membrane materials, the device for detecting the membrane performance is of utmost importance, since the test data will directly affect the research direction and results. However, the current membrane performance test device cannot meet the requirements of membranes. The requirements of the sheet detection, especially for the detection of nanofiltration membranes and reverse osmosis membranes. The main reason is that the most widely used nanofiltration membranes and reverse osmosis membranes on the market today are roll-type components, which have a large packing density, are easy to use, operate at low cost, and have relatively uniform industry standards. The roll-type membrane element is mainly made by rolling flat-plate membranes. In the past performance testing process, only flat-plate membranes were processed into roll-type membranes for performance testing, but this increased the test cycle, test costs and Testing complexity, so membrane manufacturers and research institutions are eager to test in the form of flat membranes more efficient and convenient. However, the normal pressures for nanofiltration and reverse osmosis membranes, especially high-pressure reverse osmosis, are usually 15 to 50 bar. Currently, there are only low-pressure membrane test devices or simple ultra-filtration cups on the market. These test devices are generally resistant to pressure. The performance of the diaphragm can only be tested within 5-6 bar. Thus limiting the test pressure conditions, in addition to microfiltration and ultrafiltration membrane can achieve test results, for nanofiltration and reverse osmosis can not meet the requirements.
The difficulty of the high-pressure diaphragm test device is how to guarantee the sealing performance of the diaphragm and the safety of the system under high pressure. It is learned that Guochu Technology (Xiamen) Co., Ltd. has successfully developed a flat diaphragm testing device that withstands high pressure and has been widely used. Adopted by domestic and foreign research institutes, the maximum withstand pressure can reach 60bar. Because the test pressure can be flexibly adjusted, the test range is very wide. It can be applied from microfiltration, ultrafiltration, nanofiltration, reverse osmosis to high pressure reverse osmosis, and it provides more efficient research institutions and companies developing membrane materials or modified membrane materials. And convenient test equipment.
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