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Method and device for acquiring streaming potential of nano-filtration

A streaming potential and nanofiltration membrane technology, applied in the direction of measuring devices, measuring current/voltage, measuring electrical variables, etc., can solve problems that have not been clearly proposed by research, and achieve the effect of simple operation and accurate numerical values

Inactive Publication Date: 2008-07-16
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In terms of experiments, although there are literatures (Szymezyk A.M., et al. "Ananalysis of the pressure-induced potential rising through composite membranes with selective surface layers", Langmuir, 2005, 21 (5): 1818-1826) on the transmembrane poten

Method used

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  • Method and device for acquiring streaming potential of nano-filtration
  • Method and device for acquiring streaming potential of nano-filtration
  • Method and device for acquiring streaming potential of nano-filtration

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Use ESNA1-K nanofiltration membrane-KCl solution system. The prepared concentration is 2.0mol m -3 Pour the solution into the liquid storage tank, place the liquid storage tank in a constant temperature tank at 20°C, start the constant flow pump, and adjust the pressure regulating valve so that the pressure gauge is 0.50 MPa. After the flow rate and the potential difference are stabilized, the conductivity, transmembrane pressure difference and potential difference of the electrolyte in the raw material solution and the permeate are respectively read by the conductivity meter, pressure gauge and potentiometer, and the transmembrane pressure difference and potential difference are measured with a stopwatch and an electronic balance. liquid flow. Change the pressure difference on both sides of the membrane through the pressure regulating valve to 0.45MPa, 0.40MPa, 0.35MPa, 0.30MPa, 0.20MPa, 0.10MPa and 0.067MPa, and measure the conductivity of the electrolyte in the raw ...

Embodiment 2

[0050] Using ESNA1-K Nanofiltration Membrane-Na 2 SO 4 solution system. The prepared concentration is 1.5mol m -3 Pour the solution into the liquid storage tank, place the liquid storage tank in a constant temperature tank at 20°C, start the constant flow pump, and adjust the pressure regulating valve so that the pressure gauge is 0.50 MPa. After the flow rate and the potential difference are stabilized, the conductivity, transmembrane pressure difference and potential difference of the electrolyte in the raw material solution and the permeate are respectively read by the conductivity meter, pressure gauge and potentiometer, and the transmembrane pressure difference and potential difference are measured with a stopwatch and an electronic balance. liquid flow. Change the pressure difference on both sides of the membrane through the pressure regulating valve to 0.40MPa, 0.30MPa, 0.20MPa and 0.10MPa respectively, and measure the conductivity, transmembrane pressure difference ...

Embodiment 3

[0053] Using ESNA1-K Nanofiltration Membrane-MgCl 2 solution system. The prepared concentration is 1.6mol m -3 Pour the solution into the liquid storage tank, place the liquid storage tank in a constant temperature tank at 20°C, start the constant flow pump, and adjust the pressure regulating valve so that the pressure gauge is 0.50 MPa. After the flow rate and the potential difference are stabilized, the conductivity, transmembrane pressure difference and potential difference of the electrolyte in the raw material solution and the permeate are respectively read by the conductivity meter, pressure gauge and potentiometer, and the transmembrane pressure difference and potential difference are measured with a stopwatch and an electronic balance. liquid flow. Change the pressure difference on both sides of the membrane through the pressure regulating valve to 0.40MPa, 0.30MPa, 0.20MPa and 0.10MPa respectively, and measure the conductivity, transmembrane pressure difference and ...

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Abstract

The invention discloses a method and a device for acquiring the streaming potential of a nanofiltration film and relates to an analyzing method for separating the streaming potential from the measured transmembrane potential. The invention measures the transmembrane potential, pressure difference, flux and rejection rate, implements nonlinear least squares fitting on the rejection rate and the flux according to the Spiegler-Kedem equation, thus acquiring the reflectance, furthermore, pressure difference of the hierarchy is treated as the tag pressure difference when the rejection rate approaches the reflectance, and the invention implements linear fitting on the measured pressure difference which exceeds the tag pressure difference and the corresponding transmembrane potential, the size of the slope coefficient is taken as the streaming potential. The measurement device comprises a thermostatic bath, a liquid storage bath, a constant flow pump and a membranous device; wherein, the liquid storage bath is positioned inside the thermostatic bath, the constant flow pump, the liquid storage bath and the membranous device are connected with each other through nonmetallic catheters, a pressure gauge, a potentiometer and a flowmeter are connected at two sides of the membranous device. The method and the device provided by the invention can successfully separate the streaming potential from the transmembrane potential and provide data support for representing the electrical property and the separability of the nanofiltration film.

Description

technical field [0001] The invention relates to a method and a device for obtaining the streaming potential of a nanofiltration membrane, in particular to an analysis method for separating the streaming potential from the measured transmembrane potential. Background technique [0002] During the membrane separation process, when the solution and the membrane surface are in relative motion due to external force (such as pressure difference, concentration difference), two electrokinetic phenomena such as streaming potential and membrane potential will occur. The streaming potential refers to the ratio of the potential difference generated on both sides of the membrane to the applied pressure difference when the electrolyte solution passes through the porous membrane perpendicular to the membrane surface under a certain pressure. The streaming potential reflects the distribution of effective charges on the membrane surface. [0003] At present, there are few studies on the str...

Claims

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Application Information

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IPC IPC(8): G01R19/00G01D21/02G01N27/26
Inventor 王晓琳尚伟娟王弘历
Owner TSINGHUA UNIV
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