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Preparation method and application of mixed substrate membrane with laminar and cage-shaped synergetic sieving effect

A mixed matrix membrane and cage-like technology is applied in the field of preparation of mixed matrix membranes, which can solve problems such as large resistance, and achieve the effects of improving separation factor, simple and controllable preparation process, and excellent comprehensive performance.

Active Publication Date: 2018-11-06
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

g-C 3 N 4 These characteristics all show its effect on CO 2 Great affinity, but use it to separate CO 2 There are few studies, which may be because g-C 3 N 4 The interlayer spacing is smaller than that of CO 2 The molecular size of the CO 2 greater resistance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1: preparation adds 1.5wt% g-C 3 N 4 The mixed matrix membrane, the steps are as follows:

[0036] Step 1, g-C 3 N 4 Preparation of:

[0037] Synthesis of g-C by Thermal Polymerization 3 N 4 . Put the dried urea into a flanged tubular heating furnace, and adjust the protective gas flow rate to 100mL min -1 , at 10°C·min -1 The heating rate was raised to 850°C, and the constant temperature was calcined for 10h, and then naturally dropped to 25°C. The resulting unpurified yellow g-C 3 N 4 Powder dispersed in water (g-C 3 N 4 The mass ratio of water to water is 30:5000), after ultrasonic treatment at 50MHz for 3h, centrifuge with a centrifuge at 12000r / min for 60min, and dry the lower layer in a vacuum oven at 100°C for 24h to obtain g-C 3 N 4 powder ready for use;

[0038] Step 2, preparation of casting solution:

[0039] The g-C prepared in step 1 3 N 4 Dissolve the powder in N,N-dimethylacetamide to prepare 100g / L solution A, and ultrasonic...

Embodiment 2

[0043] Example 2: Preparation of a mixed matrix membrane with 1.5wt% CNZ added, the steps are as follows:

[0044] Step 1, g-C 3 N 4 Preparation of:

[0045] Synthesis of g-C by Thermal Polymerization 3 N 4 . Put the dried urea into a flanged tubular heating furnace, and adjust the protective gas flow rate to 100mL min -1 , at 5°C·min -1 The heating rate was raised to 850°C, and then calcined at a constant temperature for 6h, and then naturally dropped to 25°C. The resulting unpurified yellow g-C 3 N 4 Powder dispersed in water (g-C 3 N 4 The mass ratio of water and water is 20:3000), after ultrasonic treatment at 30MHz for 2h, centrifuge with a centrifuge at a speed of 10000r / min for 20min, and dry the lower layer in a vacuum oven at 80°C for 24h to obtain g-C 3 N 4 powder ready for use;

[0046] Step 2, g-C 3 N 4 and ZIF-8 composite (named CNZ):

[0047] The g-C prepared in step 1 3 N 4 The powder was dispersed in methanol to form a 50g / L solution A, and i...

Embodiment 3

[0053] Example 3: Preparation of a mixed matrix membrane with 1.5wt% CNZ added, the steps are as follows:

[0054] Step 1, g-C 3 N 4 Preparation of:

[0055] Synthesis of g-C by Thermal Polymerization 3 N 4 . Put the dried urea into a flanged tubular heating furnace, and adjust the protective gas flow rate to 120mL min -1 , at 8°C·min -1 The heating rate was raised to 850°C, and then calcined at a constant temperature for 7h, and then naturally dropped to 25°C. The resulting unpurified yellow g-C 3 N 4 Powder dispersed in water (g-C 3 N 4 The mass ratio of water to water is 10:3000), after ultrasonic treatment at 20MHz for 3h, centrifuge with a centrifuge at 12000r / min for 30min, and dry the lower layer in a vacuum oven at 90°C for 48h to obtain g-C 3 N 4 powder ready for use;

[0056] Step 2, g-C 3 N 4 and ZIF-8 composite (named CNZ):

[0057] The g-C prepared in step 1 3 N 4 The powder was dispersed in methanol to form 80g / L solution A, and the dispersion ...

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Abstract

The invention discloses a preparation method and application of a mixed substrate membrane with a laminar and cage-shaped synergetic sieving effect. The preparation method is characterized in that firstly, a zeolite imidazole framework ester material ZIF-8 is introduced into g-C3N4 (graphitized carbonitride) dispersion liquid in site; then, a composite material is dispersed into a polyether blockamide copolymer; a polyether block amide gas separation membrane with the laminar and cage-shaped synergetic sieving effect is prepared by a solution tape casting method; the prepared membrane is a homogeneous dense membrane; the wet membrane thickness is controlled to be 50 to 500mum. The provided inorganic material preparation process is easy to control; holes in tri-s-triazine rings of g-C3N4 and between nanosheet layers of a g-C3N4 and ZIF-8 composite material provide passages for CO2; the prepared membrane has acid and alkali resistance and good flexibility; when the membrane is used forgas separation, the excellent comprehensive performance is realized; the CO2 can be effectively and selectively separated; a fast migration passage is provided for CO2 transfer.

Description

technical field [0001] The invention relates to a preparation method and application of a mixed matrix membrane with sheet-layer and cage-like synergistic screening functions, and belongs to the technical field of gas separation membranes. Background technique [0002] Mixed matrix membrane is a composite membrane in which inorganic materials are added to organic polymers. Due to its excellent separation performance, simple preparation, economical and practical, it has become a research hotspot for current researchers. The introduction of inorganic particles in the mixed matrix membrane on the one hand interrupts the accumulation of molecular chains, speeds up the transfer of gas molecules, and improves the gas permeability. On the other hand, inorganic particles can not only increase the affinity for the target gas, but also provide diffusion channels that match the molecular dynamic diameter of the target gas, thereby enhancing the gas selectivity. Therefore, mixed matrix...

Claims

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Application Information

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IPC IPC(8): B01D71/56B01D67/00B01D53/22
CPCB01D53/228B01D67/0079B01D71/56B01D2256/22
Inventor 张新儒王永洪张桃刘成岑
Owner TAIYUAN UNIV OF TECH
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