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Abstract: Sub-rigid polymer precision micropore filtration technology from hardware to software is a high-efficiency liquid-solid precision filtration technology developed by our independent innovation. It has been in development for more than 43 years since its inception, and it has been promoted and applied in industrial production. It has been thirty years. This article briefly introduces the main overview of the technology hardware and software, and briefly lists several production areas that have been successfully applied, as well as some major calculations and experimental data.
Abstract: The sub-rigid polymer precise microporous filtration technology is high-performance liquid-solid precise filtration technology which is researched and developed independently by us from hardware to software. It has been more than forty-three years since the beginning of research, and It has also been applied in industrial production for thirty years. This article brief introduces the main profile of hardware and software of the technology, and simply lists some production areass which have been successfully applied. It also introduces the main calculation and the experimental data.
Keywords: sub-rigid, precision microfiltration, filter cake filtration, clarification filtration
Keywords: sub-rigid, precise microporous filtration, cake filtration, clarification filtration
1. Overview (1. Overview) The membrane filtration technology developed in the 21st century is one of Zui's important inventions. It can significantly improve product quality, yield and labor productivity, reduce energy consumption, material consumption and production costs, and reduce Waste and wastewater discharges are becoming more widely used. The 21st century is a century in which membrane filtration technology is further developed in depth and breadth, and it will have an immeasurable impact on the world economy.
The development of membrane filtration technology which is developed in twentieth-century is one of the most important inventions. It can obviously improve the product quality, yield and labour-productivity. It can reduce energy consumption, material and production costs, and can reduce waste Membrane filtration technology has been further developed at the depth and width in the twenty-first century, and it will lead to an immeasurable affection on the world economy.
Membrane filtration can be divided into two types: homogeneous membrane filtration and heterogeneous membrane filtration. Reverse osmosis, nanofiltration and most ultrafiltration are homogeneous membrane filtration, microporous membrane and partial ultrafiltration are heterogeneous membrane filtration. Heterogeneous membrane filtration can be further divided into two major branches, one is that the filter medium is a flexible film, and the other is that the filter medium is a rigid or sub-rigid microporous tube. The thickness of the flexible film is generally only a few tens of micrometers, the raw material cost is small, the manufacturing difficulty is relatively low, so the development is fast, the application range is wide, but the tensile strength is poor, and the simple physical method cannot be used (ie, the high pressure gas back blowing method) The removal of the filter cake and efficient regeneration is difficult to apply to the filtration of the precision filter cake which can obtain the dry filter cake. At present, most of the microporous membrane is only used for precision clarification filtration of liquid with little solid content, only a few The fraction is used for dynamic thickening filtration without a filter layer. Rigid or sub-rigid microporous tubes with a wall thickness of generally not less than 2 to 3 mm, relatively high tensile and compressive strength, and physical backflushing and regeneration, not only for large-scale solids Less liquid precision clarification filtration, for dynamic thickening filtration without filter layer or thin layer, and also used for liquid precision filter cake filtration with more solid content and capable of discharging dry filter cake.
Membrane filtration can be divided into two types of homogeneous membrane filtration and non-homogeneous membrane filtration. Reverse osmosis, nanofiltration and most of ultrafiltration are homogeneous membrane filtration. Microporous membrane and some ultrafiltration are non-homogeneous membrane filtration. Non-homogeneous membrane filtration can The is divided into two branches. One of its is that filter medium is flexible thin membrane, and the other is that its filter medium is rigid or sub-rigid microporous media. The thickness of flexible thin membrane is only a few dozen microns. The raw materials is less, and the difficulty of manufacturing is relatively lower. So it develops rapidly and it be applied widely. But its tensile strength is poor, and we can not use simple physical method (method of high pressure gas backblowing) for cake Dissolving and regeneration. It is difficult to be applied for precise cake filtration which can get dry cake. The vast majority Microporous membrane is only used for liquid-solid precise clarification filtration containing small quantities of solid particles, and only a few used for the dynamic thickening filtration with non-cake layer. The thickness of rigid or sub-rigid microporous tubes is generally not less than It can be used only for the liquid precise clarification filtration with a little volume of solid and non-cake layer 2-3 mm. The tensile strength and compressive strength are relatively high. It can be used for cake discharging and regeneration by physical methods. Or thin-cake layer dynamic thickening filtration, but also used for liquid precise cake filtration which has substantial amount of solid content and can discharge dry cake on a large scale.
Rigid or sub-rigid microporous filter tubes are metal sintered microporous tubes, inorganic sintered microporous tubes and polymer sintered microporous tubes. The birth and industrial application of metal and inorganic materials has been seventy to one hundred years; the birth of polymers has only been forty years, and industrial applications have only been for more than 30 years. From the aspects of filtration precision, mechanical strength, reworkability, anti-blocking performance, corrosion resistance, heat resistance and price, the three types of microporous filter tubes have their own advantages and disadvantages. Metal heat resistance and mechanical strength are quite satisfactory, but price and corrosion resistance are its disadvantages; inorganic heat resistance and corrosion resistance are advantages, but mechanical strength and reworkability are disadvantages; heat resistance of polymers It is its disadvantage. At present, it is widely used in industrial production and can not exceed 120 °C, but because of the ease of processing, the price is low, the mechanical properties are not bad, the corrosion resistance is very prominent, although the development time is short, since the 1960s At the end of the trial production in China, the technology is becoming more and more mature, the application field and application scale are getting bigger and bigger, and currently in China, it has exceeded metal and inorganic.
The rigid or sub-rigid microporous filter tubes contain sintered microporous metal tubes, sintered microporous inorganic tube and sintered microporous polymer tube. From birth and industrial application of metal and inorganic, it has history of 70-100 years. From birth of polymer type there Is only 40 years, and the industrial application is for only 30 years. According to comprehensive comparison of several aspects, such as filtration accuracy, mechanical strength, re-processing performance, anti-clogging performance, corrosion resistance, heat resistance and price, three The heat and corrosion resistance of inorganic are its advantages, but the mechanical strength and Re-processing performance are its disadvantages. The heat resistance of polymer type is Its shortcoming, and at present the temperature at which it can be widely used for the industrial production can not exceed 120 °C. Because of alternative processing, lower price, not bad mechanical properties and very prominent corrosion resistance, although the development time is the shortest The application areas and the application scale are larger and larger, and it is more than metal and inorganic types at present in China.
In order to improve the filtration precision, in order to efficiently filter finer particles and reduce the energy consumption in the filtration process, no matter the inorganic, metal or polymer, the multi-layer microporous tube is developed and developed. The capillary pore size of the surface layer is small, the capillary pore size of the base layer is large, the base layer is closely bonded to the surface layer, and the surface layer can withstand high-pressure gas back-blowing. The multi-layer inorganic inorganic membrane technology has developed rapidly in foreign countries, and it has been widely developed in China. The development of multi-layer microporous tubes of metal and polymer is relatively late, but the progress is also very fast. A product that has been successfully applied in industrial production.
In order to improve filtration accuracy, to catch smaller particles efficiently, and to reduce energy consumption in the process of filtration, the inorganic, metal and polymer type have been researching and developing multi-layer microporous tube. The surface pore diameter of such filtering tube The base inorganic layer is bonding closely with the surface, and the surface can withstand the backblowing of high-pressure gas. The multilayer inorganic membrane technology has been developed rapidly abroad, and domestic The multilayer-organic membrane technology is also highly successful in extensive development. The multi-layer microporous tube of metal and polymer type is developed late, but the progress is also very fast. All of them have developed the products which have successful application in industrial production.
Since the beginning of 1966, the author has been engaged in the research of polymer micro-pore filtration technology in China. Based on the successful development of various polymer sintered microporous filter tubes and various structural filters, the hardware and software of the technology have been carried out. Forty-three years of continuous development, development and application of the system. Due to space limitations, this article only introduces some of the main aspects of the technology.
The author has started to engage in the development of polymer precise microporous filtration technology since early 1966 in domestic. Based on a variety of polymer sintered microporous filter tubes and many structures of filters which have been successfully developed, the hardware and software of the technology have Having system development, popularization and application for consecutive 43 years. Due to space limitations, this article only introduces some of the main overviews of the technology.
(Author: Shanghai Dongpu Microfiltration Technology Institute)
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Overview of polymer precision micropore filtration technology
Polymer Microporous Precise Filtration Technology
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