Looking for a suitable pump in process development
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This post was last edited by Gao Tianyi on 2009-8-10 at 20:51. Hello everyone, I am looking for a suitable pump for use in process development: 1. For transporting natural latex; properties of the liquid: pH around 8.0, viscosity of 500–1500 centipoise, with a solid content of 30–60%. 2. For transporting organic resin emulsions; properties of the liquid: pH between 6 and 9, viscosity of 1500–2000 centipoise, with a solid content of 60%. Please advise me on which type of pump would be suitable. Thank you
Original poster, natural rubber contains 30-60% solids. May I ask: are these solid particles hard, and what is their diameter? The material is probably sensitive to shearing. I know there is a Japanese brand of pump designed specifically for transporting latex, in order to prevent it from breaking down. Additionally, considering the use of a positive displacement pump for delivery is an option.
Rotor pumps and screw pumps can be used; mechanical conveying methods involve wear and tear. While using the natural flow resulting from a pressure difference is a simple approach, it is also the most effective.
The poster might want to consider these two products: the diaphragm pump of the sheet-valve type from WILDEN – there is a model designed specifically for transporting suspended solids, with diaphragms that are resistant to wear; however, it is more expensive. The second option is the eccentric pump from the French company BLACKMER – it does not cause shear forces, is suitable for transporting high-viscosity materials, features an automatic refilling mechanism, and its components are made of 316TI material, making it resistant to wear
It seems that a pneumatic diaphragm pump is the best choice; there’s also a peristaltic pump, but I’ve only heard of it. I’ll do some research on it.
With such high viscosity, ordinary centrifugal pumps definitely won’t work. A gear pump or a screw pump can be used.
A diaphragm plunger pump would be more suitable for this purpose
It is recommended to use domestic pumps; screw pumps work well as well, allowing cost savings while offering good economic value and durability
Use a cam pump; it is more energy-efficient than a screw pump and easier to maintain!
This post was last edited by pair2cn on 2009-8-15 20:29. For transporting media with high viscosity, screw pumps are generally used. I have previously worked on single-screw pumps used for transporting catalysts; these catalysts have high viscosity and a high content of solid particles. The term for such pumps in English is Progressive Cavity Pump. The screw is made of stainless steel, and the pump casing is lined with rubber. Some foreign pump manufacturers, such as Moino, do a good job. Pumps generally don’t have problems; the issues usually arise from the pipeline design. Since the backup pump is in standby mode, solid particles in the fluid within the pump’s inlet pipe can accumulate and block that inlet, causing the pump to run dry once it starts up, which leads to its failure. I have no experience with the moving equipment in the latex industry. What I have written is for reference only. Since it is process development and there is no existing experience to draw on, the selection of equipment for such special media needs to be discussed with the technicians at the pump manufacturer, as they are more specialized in this area.
Anyway, centrifugal pumps are definitely not going to be used; gear pumps, rotor pumps, and screw pumps can be used instead. These pumps are most suitable for transporting slurries. It should be noted, however, that it is best to fill them with liquid before starting operation to avoid excessive wear