crossflow-filters cross-flow filtration
Thread Content
In China, the method of dead-end filtering is quite mature. However, dead-end filters are more suitable for solutions with low solid content; they are not appropriate for liquid-solid filtration processes that involve flocculent substances. Therefore, for liquid-solid filtration with high solid content or the presence of flocculants, a suitable filtration method should include crossflow filters. There are many articles on crossflow filtering available online, but they are all promotional in nature. In our acrylonitrile project, there is a lot of flocculent material present, so we are considering the use of crossflow filters. It is difficult to find detailed technical information on this topic either on international websites or in Chinese online resources. I wonder if any of the experts in this group are familiar with crossflow filters? I hope you can give me some advice: 1) Can this type of filtration method be regenerated? How to prevent pore clogging? Is it pulse backwashing like that of dead-end filtration? So how does one perform backblowing? II) If we need 140 m³ of filtered liquid per hour, how should the feed rate be determined? III) How is the energy (pump) required generally determined? O(∩_∩)O Thank you all teachers for your guidance.
Could the poster consider adding a pretreatment step before ultrafiltration to remove suspended and flocculent impurities? If one insists on trying cross-flow filtration, it will likely involve taking risks
The membrane filtration method is known as \"cross-flow filtration.\" I have some basic knowledge of membrane filtration: 1. The selection of membrane pore size should take into account the particle size or molecular weight of the components present in the material; it’s advisable to conduct tests to verify this. 2. There are two methods for cleaning and regenerating membranes: chemical cleaning and online backwashing. 3. In cross-flow filtration, it’s necessary to maintain a certain flow rate over the membrane surface, and this flow rate serves as a key factor in determining the choice of pump
This post was last edited by zfy_80522 on 2009-11-22 at 21:58. The error-flow filtration system differs significantly from traditional filters; it prevents solids from accumulating on the filter membrane. Due to the rapid circulation of the filtrate within the system and the different pressures on both sides of the filter membrane, the purified fluid flows into the pre-prepared container in a tangential direction. Meanwhile, the rapid circulation of the unfiltered fluid helps to carry away the solids attached to the membrane. Cross-flow filtration technology operates without pollution, and there is no emission of auxiliary filtering agents such as diatomite; it is an environmentally friendly filtration technique. I. The basic principle of cross-flow filtration is to use a circulation pump to drive the substance to be filtered through the pores of filter membranes with different pore sizes at high speed. Under pressure, the filtrate passes out in a tangential manner ； The unfiltered fluid generates turbulence due to its high-speed movement, continuously flushing the inner surface of the membrane rod and carrying away any small amounts of solids attached to the membrane, thereby preventing blockage of the filter membrane and ensuring normal filtration. The unfiltered liquid is continuously circulated, causing the solid concentration to increase over time; once this concentration reaches a certain level, it is automatically discharged, thereby achieving solid-liquid separation. II. Common types of membranes used in cross-flow filtration systems 1. Materials used for cross-flow filtration membranes Membrane materials are generally selected from plastics, polypropylene, polysulfone, polyethersulfone, or ceramic membranes. Polymer membranes and ceramic membranes are commonly used. 2. Types of filter membranes Filter membranes can be classified into microporous filtration membranes, ultrafiltration membranes, nanofiltration membranes, reverse osmosis membranes, etc., based on their pore sizes. Based on their shape, filter membranes can be classified into hollow fiber membranes or capillary membranes, tubular membranes, spiral-wound membranes, etc. 3. Substances that can be filtered by different types of membranes Source: http://cache.baidu.com/c?m=9f65c ... 94744850&user=baidu
First of all, thank you for your answer. Our project seems to fall under the category of microfiltration. Some manufacturers told us that a crossflow filter is more suitable for situations where the impurity content is at a certain percentage level. If that’s the case, then why is pre-treatment necessary before using a crossflow filter? 2# flybird524
In fact, considering the use of metal filter elements for filtration
O(∩_∩)O Thank you for sharing. . . . 4# zfy_80522
The preprocessing requirements mentioned by the poster. Not all cross-flow filtration processes require pretreatment; this is determined by the structure and properties of the cross-flow filtration membrane itself. For ceramic filtration and metal membrane filtration, no pretreatment is required; only proper safety filtration is necessary
I just received news regarding cross-flow filters: Shanghai Biyaz Company will hold a technical exchange meeting at the end of November, and it will be possible to attend and learn from it.
The selection of filters depends primarily on the requirements of the process. Regarding cross-flow filtration, I have been searching for relevant information recently; it is understood that companies in China such as Jiangsu Jiuwu High-Tech and Hunan Henghui Membrane Technology are engaged in this area.