Difference and working principle between ultrapure water machine and distilled water machine

Now more and more laboratories use ultrapure water machine to replace the former distilled water machine What are the advantages of ultrapure water machine compared with distilled water machine? What is the principle of ultrapure water machine? How does it convert tap water or distilled water into ultrapure water? These are the questions of many customers In fact, ultrapure water machine has become a trend to replace distilled water machine
As we all know, the process of tap water processing in waterworks is similar to that of tap water processing, except that there are higher and stricter requirements on the composition of water Now many domestic manufacturers are producing ultra pure water machines, but the methods are basically the same The basic process is almost the same, and the general difference is filtration The difference between the filtration effect of the filter and the selection of RO membrane For ppcotton and RO membrane, the selection of ultra purification column in the current domestic machine is generally imported, because the domestic technology can not be achieved, in fact, the competition of each company is the quality of the machine and the replacement of consumables These are just more introductions Let's talk about the water production principle of ultra pure water machine
First of all, many of us use tap water to convert into pure water, that is, grade I water, grade II water and grade III water in GB / 6682-92 standard, and electronic ultrapure water in GB / t11446.1-1997 Tap water enters ppcotton for preliminary filtration first, and then some fine solids and rust are filtered out However, there are still a lot of anions and anions in the water from preliminary filtration These ions can't be removed by ppcotton, so we need to use active carbon to absorb some heavy metal ions and Cl ions in the water, so that there are few impurities in the general water, but the water can't meet the requirements of the general laboratory, then we can use a RO membrane for another filtration, the density of the RO membrane is very high, and the molecular weight can be almost more than 100 Impurities are removed, and the desalination rate is about 95% - 99% The particles in the remaining water have little impact Such water can be used to clean our laboratory utensils This water is equivalent to the previous distilled water, which is often called class III water Of course, for higher requirements laboratory instruments, this water can not meet the requirements, so we need other water In order to make the water more pure, we usually use deionized resin and super purified resin to remove the trace impurities and salts in the water, so that the water can reach the standard of grade II and grade I water For some experiments with special requirements, such as HPLC, IC, GC, ICP-MS, PCR, TOC analysis and other experiments, we must add UV lamp to kill bacteria and inhibit organic matters For the experiments with special requirements, UV lamp must be added to kill bacteria and inhibit organic matters Some experiments such as gene research, cell culture, electrophoresis, gel analysis and culture medium preparation require UF ultrafiltration to remove heat sources Some need to use UV and UF to achieve the requirements of experimental water quality The specific choice is what kind of experiments the customers do, water consumption and budget, which are the choices for customers Generally speaking, the principle of ultra pure water machine is just like this The difference between millipore and domestic machines in principle is not big The difference is only the technical content of domestic and imported machines and the fineness of workmanship As long as domestic machines strengthen the research and development of technology, they are not worse than imported machines.