Full-automatic ultrafiltration membrane pore size distribution determining instrument and automatic determining method thereof

Abstract

The invention discloses a full-automatic ultrafiltration membrane pore size distribution determining instrument and an automatic determining method thereof, the full-automatic ultrafiltration membrane pore size distribution determining instrument comprises a gas supply bottle and a testing membrane tank for fixing and sealing an ultrafiltration membrane, and is characterized in that an electric flow regulating valve and a displacement liquid jar containing displacement liquid are arranged between the gas supply bottle and the testing membrane tank, a pressure probe is arranged on the displacement liquid jar, an electronic scale or a liquid flow sensor is arranged at a displacement liquid permeation side outlet of the testing membrane tank, the signal output ends of the pressure probe and the electronic scale or the liquid flow sensor are connected with a data acquisition module for real-time acquisition of pressure and flow signals, a communication module is used for performing signal transmission with a computer controller, the signal output end of the computer controller is connected with the signal input end of the electric flow regulating valve, and the computer controller is further used for performing real-time feedback control on the electric flow regulating valve. The full-automatic ultrafiltration membrane pore size distribution determining instrument has the advantages that the full-automatic ultrafiltration membrane pore size distribution determining instrument can realize real-time automatic control of determination conditions and acquisition of measured data, perform real-time processing on the data and meet the requirements for assessing performances of various sieve pore type filtration membranes.

Description

technical field [0001] The invention relates to a membrane pore size measuring instrument, in particular to a fully automatic ultrafiltration membrane pore size distribution measuring instrument and an automatic measuring method thereof. Background technique [0002] Ultrafiltration membrane is a type of sieve membrane with a pore size of 5-150 nanometers. It is mainly used for the separation of substances with different molecular weights. It is widely used in water treatment, biopharmaceutical, food and other industries. The separation performance of ultrafiltration membranes is mainly affected by pore characteristic parameters such as average pore size and pore size distribution. At present, the performance evaluation of ultrafiltration membranes is mainly through testing standards such as bovine serum albumin, ovalbumin, and polyethylene glycol with different molecular weight levels. The cut-off molecular weight of particles is calibrated as a characterization method for ...

AI Technical Summary

Problems solved by technology

The separation performance of ultrafiltration membranes is mainly affected by pore characteristic parameters such as average pore size and pore size distribution. At present, the performance evaluation of ultrafiltration membranes is mainly through testing standards such as bovine serum albumin, ovalbumin, and polyethylene glycol with different molecular weight levels. The cut-off molecular weight of particles is calibrated as a characterization method for the pore size of ultrafiltration membranes. The main problem of using this standard particle rejection method to characterize the performance of ultrafiltration membranes is that it is difficult to find a series of sizes, uniform particles, and membrane materials. There is no standard particle with chemical force, and there is a gap between the nominal rejection rate of the ultrafiltration membrane calibrated and the actual application rejection rate

[0003] Chinese utility model patent membrane pore size measuring instrument (application number 01273986.3, authorized announcement number CN2508242Y) discloses a membrane pore size measuring instrument based on the bubble point-flow rate method to measure the membrane pore size, including a gas supply bottle and a pressure balance tank connected in sequence , test pool and flowmeter have the advantages of simple structure and convenient use, but the membrane pore size analyzer can only measure the pore size of the order of microns, and cannot measure the pore size distribution of ultrafiltration membranes of the order of nanometers, and requires manual control of the measurement conditions. It is necessary to manually collect measurement data such as pressure and flow for the calculation of parameters such as average pore diameter, which has the disadvantages of large error and inconvenient operation.

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