A nanofiltration salt separation process confirmation method based on isoelectric point identification

An isoelectric point and process technology, applied in chemical instruments and methods, membranes, reverse osmosis, etc., can solve the problems of unsuitable process requirements, low efficiency, complex process formulation process, etc., to improve the success rate and work efficiency, accurate definite effect

Active Publication Date: 2020-08-28
SUZHOU XINER ENVIRONMENTAL TECH CO LTD
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  • Application Information

AI Technical Summary

Problems solved by technology

Membrane salt separation has technical advantages in the selection of many salt separation processes, but the process formulation and membrane selection process is a complicated and systematic work. There are various options for nanofiltration membranes, and there are individual differences in membrane separation characteristics. This difference can only be screened through a large number of experiments, which takes a long time, has a low success rate, lacks scientific method guidance, and is limited by the inherent characteristics of membrane modules. It is likely that all selected membranes are not suitable for process requirements or Inefficiency fails to meet separation goals
Process development often relies on experience, low success rate, complicated membrane screening process, complex process formulation process, low efficiency and lack of scientific workflow

Method used

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  • A nanofiltration salt separation process confirmation method based on isoelectric point identification
  • A nanofiltration salt separation process confirmation method based on isoelectric point identification
  • A nanofiltration salt separation process confirmation method based on isoelectric point identification

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Effect test

Embodiment 1

[0049] Nanofiltration Membrane Separation of Na 2 SO 4 And the process confirmation method of the mixed solution of NaCl:

[0050] For membrane screening, select a nanofiltration membrane roll-type NF2540 component. After testing, the initial separation coefficient of the membrane for the two components is about 2.5, which can meet the process requirements and can be used directly. Reach above 15Bar, the operating flow is 1m 3 About / h, the operating temperature is 30-35 degrees Celsius, and when the pH is adjusted to 5 with HCl, the initial separation coefficient increases to 2.8, which is finally confirmed as the optimal separation process scheme.

Embodiment 2

[0052] Separation of Mg by Nanofiltration Membrane 2+ and Li + The process confirmation method of the mixed solution:

[0053] For membrane screening, select a nanofiltration membrane roll-type NF2540 module. After testing, the initial separation coefficient of the membrane for the two components is about 1.3, and in the relative isoelectric point detection, the rejection rate of 2000ppmNaCl is 60%. You can try to pass various processes Parameter optimization, increase the initial separation coefficient, found that when the operating pressure reaches above 15Bar, the operating flow rate is 1m 3 / h, temperature 25-35 degrees Celsius, HCl to adjust the pH to about 4, the initial separation coefficient increased to 1.9, and finally confirmed as the optimal separation process.

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Abstract

The invention relates to a nanofiltration salt-dividing process confirmation method based on isoelectric point recognition. The method comprises the following steps of: S1, membrane screening: determining initial separation coefficients of different membranes on materials based on recognition on isoelectric points on the surfaces of different membranes; according to a selective preference principle, dividing the membranes with great initial separation coefficients and small relative isoelectric points into I membranes, II membranes, III membranes and IV membranes; S2, process parameter optimizing: optimizing the process parameters for the selected II membranes and III membranes, wherein the optimized parameters comprise operating pressure, operating flow, operating temperature and PH value of a separate material; and S3, process flow confirming: determining the membrane type according to the S1 and directly using the I membranes; optimizing the process parameters in the S2 for the II membranes and the III membranes; and directly abandoning the IV membranes. The method provided by the invention is integrally scientific and systematic and is easy to understand and maser, and the work efficiency is increased.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and relates to a method for confirming a nanofiltration salt separation process based on isoelectric point identification. Background technique [0002] With the society's increasing requirements for environmental protection technology, salt separation technology has attracted more and more attention from different industries, especially some industries that produce saline wastewater or mixed salt wastewater, such as coal chemical industry, electroplating, printing and dyeing, etc. According to the development trend of environmental protection requirements at this stage, zero discharge is an inevitable development requirement. In the middle, only through advanced and reasonable salt separation technology can the final reduction and zero discharge be efficiently completed. At the same time, some industries can also recycle There are precious metals of economic value or high-purity ino...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/44B01D61/12
CPCB01D61/12B01D2311/18C02F1/442
Inventor 刘景光唐叶红何铁峰吴波
Owner SUZHOU XINER ENVIRONMENTAL TECH CO LTD
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