【Weekly Topic】What is the highest level of filler efficiency that can be achieved with current inventions?
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The last edit to this post was made by wu_pb on 2011-5-13 at 21:25. To explain, there are two parameters that are inversely related to each other and used to measure the efficiency of packing. One is NTSM (Number of Theoretical Plates per Meter; in simple terms, it indicates how many theoretical plates correspond to the efficiency of the packing per meter, with higher values meaning greater efficiency). The other is HETP (Height of Equivalent Theoretical Plate; simply put, it shows how tall one theoretical plate can be achieved using this packing, with lower values indicating greater efficiency). And NTSM=1/HETP. It is reported that a domestic company has developed a type of bulk packing material made of mesh material and about the size of a grain of rice. This material has very high efficiency, but it is not known exactly how high that efficiency is Among the fillers available in the world, which one has the highest efficiency? What level of efficiency can be achieved?
This post was last edited by wiseboy on 2011-4-27 23:22. (1) If you have a thorough understanding of chemical engineering theory, you’ll realize that such efficient fillers are essentially just a version of \"gas-solid-liquid fixed-bed reactors\". This concept has been around for a long time; it’s simply not called a \"filler\", and it’s no new invention； (2) The production of this filler also does not involve mechanical processing using machine tools; instead, the manufacturing process for metal catalysts (mainly shaping) is utilized to create tiny “filament balls,” whose structure is very similar to the “fluff” that forms on synthetic fiber clothing. However, the production of solid catalysts is far more complex than that ； (3) Packing with high separation efficiency generally presents greater resistance. The packing of the size you mentioned, similar to solid catalysts in gas-solid-liquid fixed-bed reactors, has extremely high resistance ； (4) This type of filler can be used in special applications ； (5) In recent years, the inventions related to fillers and trays have involved various minor changes in their geometric shapes, but there has been no substantial progress in terms of principle.
This post was last edited and replied to by springflower on 2011-4-27 at 17:09. Reply to 2# wiseboy: Thank you for your participation, but what are the performance characteristics of the filler you mentioned? Or for the fillers you are already familiar with, what is the highest performance level that can be achieved? Because we are developing a filler with very high efficiency. Interested in this area. PS: The filler I’ve developed can be used in vacuum environments, as its pressure drop is low enough. Chinese people, after all, always prefer the \"most xx\" option – it seems that as long as you know who is the biggest, smallest, or best in a particular industry, you’re considered an expert, haha.
NTSM can reach up to 15, or even higher, in towers of around DN400. However, the tower diameter must be about 50% larger than that of ordinary packing.
Thank you, what I can achieve is 30–50 for experimental fillers.
Reply to 5# springflower: This type of filler can be used for isotope separation, but I firmly refuse to say any more.
Chapter 2, Section 7 of \"Modern Tower Technology\" (published by Sinopec Press, edited by Lanzhou Institute of Machinery and Petroleum, 2nd edition, 2005) discusses various types of high-efficiency packing; among them, the θ-ring (Dixon) NTSM has an efficiency of nearly 50, and it is also used in isotope separation. It is unclear whether what wiseboy is referring to is a packing of this type. I’m very interested in the new type of filler mentioned by the original poster; could you describe it roughly?
I’m not sure if there are any standardized, efficient packing materials available in China
This post was last edited by rocky on 2011-5-16 14:21. The forum is having issues, so attachments cannot be uploaded; therefore, a link has to be used instead. CN100384527: A grid-type structured packing material; the mass transfer properties of this new type of gridstructured packing material. http://d.wanfangdata.com.cn/periodical_hgjz200705013.aspx A grid-type structured packing material used for liquid-liquid extraction. http://d.wanfangdata.com.cn/periodical_hnhg201011014.aspx
In the early 1960s, our country was in urgent need of distilling and concentrating heavy water. The Ministry of Chemical Industry organized relevant research institutes to successfully develop multi-tube high-efficiency packing distillation technology, marking a new advancement in China’s packing technology. Is it because this can’t be said? :D
1. There is no best, only better ； 2. There are both advantages and disadvantages.