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1. Characteristics of filter media
The filter membrane material is selected according to the characteristics of the liquid or gas. Generally, a hydrophilic membrane is used to filter an aqueous solution, and a hydrophobic membrane can be used to filter an organic solvent.
2. Filtered processing volume.
The filter size and the number of filter elements are considered according to the flux provided by the production process. Generally speaking, the flow rate of a 10-inch filter element is 0.5 ton/hour (the flux of filtered water). If the flux is to reach 1.0T, a 30-inch filter core can be selected, and some leeway can be reserved. The accumulation of impurities on the surface of the filter membrane will lead to a decrease in flux. If a filter with a core of 20 inches is used, it may not meet the requirements.
3. Pressure and temperature
The appropriate filter element is determined according to the filtration temperature, pressure, and disinfection conditions during filtration. The maximum working temperature of the general filter element is 80~90°C. Activated carbon fiber is 65°C, stainless steel folding is 200°C, and titanium sintered filter element can reach 280°C.
The maximum pressure of the microporous membrane folded filter element is 0.42Mpa/forward, the titanium sintered filter core is 0.5Mpa, and the stainless steel folded filter core is 0.6Mpa.
4. Excessive requirements
The degree of precision that filtration needs to achieve (requirements for sterilization and particle removal). The filtration efficiency of deep membrane filtration and absolute membrane filtration is different. For example, the absolute accuracy of 0.2um is basically used for sterilization; the relative accuracy of 10-20um can be selected for the removal of visible particles.
5, Filtering by step
According to the pollution degree of the filtrate and the impurity content, the pre-filter should be selected and the number of stages of filtration should be confirmed. The purpose of pre-filtering is to prolong the life of the final filter and reduce the cost. The design of the pre-filter affects the effect and life of the final filter.