Method for predicting mass transfer efficiency of two-dimensional separation membrane by dielectric spectroscopy

The method of predicting the confined mass transfer efficiency of two-dimensional separation membranes by dielectric spectroscopy solves the problem of inaccurate prediction in existing technologies, realizes accurate judgment of the confined mass transfer efficiency of two-dimensional separation membranes, simplifies the research process, and saves time and costs.

CN119499883BActive Publication Date: 2026-04-28TIANJIN UNIV
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Patent Information

Application Number
CN202311075815.1
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-08-25
Publication Date
2026-04-28
Estimated Expiration
2043-08-25

AI Technical Summary

Technical Problem

In existing technologies, the prediction of confined mass transfer efficiency of two-dimensional separation membranes is not accurate enough and is highly subjective, resulting in a waste of research time and costs.

Method used

The dielectric spectroscopy method is used to determine the dielectric relaxation time ratio between the two-dimensional separation membrane and the reference membrane. The dielectric spectrum curve is then fitted using the Havriliak-Negami equation to assess the confinement mass transfer efficiency. This method is suitable for predicting the permeation rate of water or other solvents in two-dimensional separation membranes.

Benefits of technology

It accurately and objectively predicts the confined mass transfer efficiency of two-dimensional separation membranes, is simple and efficient, and is applicable to different types of two-dimensional separation membranes, reducing research time and costs.

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Abstract

The application discloses a method for predicting the limited mass transfer efficiency of a two-dimensional separation membrane by using dielectric spectrum, comprising the following steps: S1, respectively measuring the dielectric spectrum of water in the two-dimensional separation membrane and a reference membrane in the range of 10 ‑3 ~ 10 3 Hz, calculating the dielectric relaxation time after obtaining the dielectric relaxation frequency; S2, judging the limited mass transfer efficiency of water in the two-dimensional separation membrane according to the dielectric relaxation time ratio τ / τ0 of the dielectric relaxation time τ of water in the two-dimensional separation membrane and the dielectric relaxation time τ0 of the reference membrane; when the τ / τ0 is less than 1, it is judged that the limited mass transfer efficiency of water in the two-dimensional separation membrane is higher than that of the reference membrane; when the τ / τ0 is greater than 1, it is judged that the limited mass transfer efficiency of water in the two-dimensional separation membrane is lower than that of the reference membrane. The method can accurately predict the limited mass transfer efficiency of different types of two-dimensional separation membranes, effectively reflect the state and relative transmission rate of water in the interlayer of the two-dimensional separation membrane, and provide technical support for the research on the high-efficiency separation two-dimensional membrane.
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