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Preparation method of high performance permeation evaporation permeable membrane

A pervaporation and water-permeable membrane technology, applied in chemical instruments and methods, semi-permeable membrane separation, membrane technology, etc., can solve the problem of difficult to control the direction of molecular sieve crystal growth, the surface of molecular sieve membrane is not uniform and complete, and the growth mechanism of molecular sieve crystal is complex, etc. problems, to achieve the effect of excellent separation performance, increased operational flexibility, and low requirements

Inactive Publication Date: 2005-03-23
NANJING UNIV OF TECH
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  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Due to the complex growth mechanism of molecular sieve crystals, it is difficult to control the growth direction of molecular sieve crystals, making its synthesis and preparation quite difficult.
The growth process of molecular sieve membranes is extremely sensitive to various operating conditions, such as the source of raw materials for silicon and aluminum, the formula and addition amount of seed crystals, the process conditions of synthesis, the time and temperature of crystallization, the structure of synthesis equipment, etc., may all be extremely sensitive. The earth affects the molecular sieve film-forming process. At present, the film-making process is still in the exploratory stage, which often produces discontinuous growth of crystals, resulting in intercrystalline pores (non-molecular sieve channels) being much larger than molecular sieve pores, and the molecular sieve membrane surface is not uniform and complete. Membrane defects will seriously affect the separation selectivity of the membrane

Method used

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  • Preparation method of high performance permeation evaporation permeable membrane
  • Preparation method of high performance permeation evaporation permeable membrane
  • Preparation method of high performance permeation evaporation permeable membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The support body is a porous mullite tube prepared by the Membrane Department of Nanjing University of Technology, and the composition of mullite is 75wt%Al 2 o 3 , 25wt% SiO 2 . According to 6.25Na 2 O: 2.5Al 2 o 3 : 5SiO 2 : 300H 2 The molar ratio of O is the formula, calculate silicon source, aluminum source and NaOH, H 2 The required amount of O was weighed separately with an electronic balance. The silicon solution and the aluminum solution are mixed and stirred to form a gel, and then poured into a reactor made of polymer material.

[0028] Put the support body pre-coated with NaA molecular sieve seed crystals into the reactor that has been filled with the mixed gel, and seal it. Put the reactor horizontally into the heating device for reaction, and ensure that the support is completely immersed in the gel. The hydrothermal synthesis temperature is 100°C, and the synthesis time is 2.5 hours.

[0029] After the synthesis is completed, the synthesized memb...

Embodiment 2

[0035]The synthesis reaction and performance test were carried out according to the steps of Example 1. The difference is that the synthesis time is 3 hours, and the pervaporation performance is shown in Table 1.

Embodiment 3

[0037] The synthesis reaction and performance test were carried out according to the steps of Example 1, except that the synthesis time was 3.5 hours, and the pervaporation performance was shown in Table 1.

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Abstract

A high-performance water-permeable osmosis-evaporation membrane is prepared through preparing a NaA-type molecular sieve membrane on the porous tubular ceramic substrate by hydrothermal synthetic reaction. Its raw materials are Na2O, Al2O3, SiO2 and H2O. Said Na-A-type molecular sieve membrane has excellent separation performance.

Description

technical field [0001] The invention provides a method for preparing a high-performance pervaporation water-permeable membrane, which belongs to the field of inorganic material permeable membranes. Background technique [0002] In many fields, it is necessary to separate and refine a variety of high-purity products, and it is hoped that the separation process will meet the requirements of low energy consumption, no pollution or low pollution to the environment. [0003] Pervaporation technology is a new type of membrane separation technology, which is mainly used in the membrane process of purifying chemicals and has a special status in chemical production. It uses the difference in the molecular size of different components in the mixture and the affinity to the membrane, which leads to the different permeability of each component in the process of pervaporation and realizes the separation of components. Pervaporation separation technology is not limited by the relationshi...

Claims

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Application Information

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IPC IPC(8): B01D61/36B01D71/02C01B39/14
Inventor 林晓徐南平罗彦仲盛来
Owner NANJING UNIV OF TECH
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