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超濾是一種加壓膜分離技術(shù)，即在一定的壓力下，使小分子溶質(zhì)和溶劑穿過一定孔徑的特制的薄膜，而使大分子溶質(zhì)不能透過，留在膜的一邊，從而使大分子物質(zhì)得到了部分的純化。超濾是以壓力為推動(dòng)力的膜分離技術(shù)之一。以大分子與小分子分離為目的，膜孔徑在20－1000A°之間。中空纖維超濾器（膜）具有單位容器內(nèi)充填密度高，占地面積小等優(yōu)點(diǎn)。

Ultrafiltration is a pressurized membrane separation technology,under a certain pressure, make small molecule solute and solvent through a certain aperture of special thin film, and make the macromolecular solute can't through it, stay in the other side of the film, which the macromolecularmaterial get part of the purification. Ultrafiltration is one of membrane separation technology with pressure as driving force .For the purpose of macromolecular and small molecular separation, membrane pore size between 20-1000 A°. Hollow fiber ultrafiltration filter (membrane), with the high filling density of unit container , small occupation area, etc.

在超濾過程中，水溶液在壓力推動(dòng)下，流經(jīng)膜表面，小于膜孔的溶劑（水）及小分子溶質(zhì)透水膜，成為凈化液（濾清液），比膜孔大的溶質(zhì)及溶質(zhì)集體被攔截，隨水流排出，成為濃縮液。超濾過程為動(dòng)態(tài)過濾，分離是在流動(dòng)狀態(tài)下完成的。溶質(zhì)僅在膜表面有限沉積，超濾速率衰減到一定程度而趨于平衡，且通過清洗可以恢復(fù)。

In ultrafiltration process, aqueous solution flow through the membrane surface which driven by the pressure.Smaller than the solvent (water) of film aperture and small molecule solute penetrates the membrane to become purged liquor (filter clogging liquid), larger than the film aperture of solute and solute group is intercepted, with flow discharge, become concentrated liquor. Ultrafiltration process is dynamic filtration, separation is done under the flow state. The solute on the membrane surface is only limited deposition.Ultrafiltration rate trend to balance when damping to a certain extent, and through cleaning can be restored.