| 摘要 |
<p>An apparatus and a method for dividing a fluid into desired proportions by means of a filtering device. In one aspect, this invention provides a method for dividing a fluid into desired portions, the method comprising the steps of: (a) providing at least one filtration device, the filtration device comprising a filter; (b) adding the fluid to the at least one filtration device, the fluid containing material dissolved or suspended therein; (c) placing the at least one filtration device to which fluid has been added in a pressure vessel, the pressure vessel capable of withstanding a specified level of pressure relative to ambient pressure; (d) forming a trapped volume downstream of the filter; (e) increasing the pressure in the pressure vessel upstream of the filter; (f) allowing a period of time to elapse, the period of time being sufficient to allow the pressure downstream of the filter in the trapped volume to be substantially equal to the pressure upstream of the filter; (g) unsealing the filtration device; and (h) venting the pressure vessel. One type of fluid that is particularly amenable to the method of this invention is a solution containing proteinaceous material dissolved therein. In this type of fluid, the solvent is typically an aqueous solvent. In another aspect, this invention provides an apparatus for dividing a fluid into portions.</p> |
