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Method for repairing support body for preparing molecular sieve membrane

A repair method and molecular sieve technology, applied in the field of supports, can solve problems such as unfavorable molecular sieve membranes, large pores on the surface of supports, etc., and achieve the effects of improving binding effect, improving overall performance and qualification rate, and avoiding the formation of defects from collapse again.

Active Publication Date: 2022-02-11
JIANGSU NINE HEAVEN HIGH TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as the pore size of the support increases, the probability of macropore defects on the surface of the support also increases, which is unfavorable for the preparation of molecular sieve membranes.

Method used

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  • Method for repairing support body for preparing molecular sieve membrane
  • Method for repairing support body for preparing molecular sieve membrane
  • Method for repairing support body for preparing molecular sieve membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1) The average pore size is 2umAl 2 o 3 The surface of the ceramic support body is cleaned and dried for use;

[0033] 2) Al with an average particle size of 30um 2 o 3 Add the powder into the water, stir evenly, and the solid content in the water is 8%;

[0034] 3) NaA molecular sieve raw powder is added to the above suspension, and the amount of NaA molecular sieve raw powder added is 5% of the above solids;

[0035] 4) Add binder and dispersant to continue to disperse evenly;

[0036] 5) coating the suspension on the surface of the ceramic support by dip coating;

[0037] 6) Drying and heat preservation at 1400° C. for 2 hours to obtain the repaired support.

Embodiment 2

[0039] 1) Clean the surface of the ceramic support body with an average pore size of 3um, and dry it for later use;

[0040] 2) Al with an average particle size of 30um 2 o 3 Add the powder into the water, stir evenly, and the solid content in the water is 5%;

[0041] 3) NaA molecular sieve raw powder is added to the above suspension, and the amount of NaA molecular sieve raw powder added is 10% of the above solids;

[0042] 4) Add binder and dispersant to continue to disperse evenly;

[0043] 5) Coating the above-mentioned suspension on the surface of the ceramic support by a wiping method;

[0044] 6) Drying and heat preservation at 1300° C. for 3 hours to obtain the repaired support.

Embodiment 3

[0046] 1) The average pore size is 2umAl 2 o 3 The surface of the ceramic support body is cleaned and dried for use;

[0047] 2) Al with an average particle size of 30um 2 o 3 Add the powder into the water, stir evenly, and the solid content in the water is 8%;

[0048] 3) NaA molecular sieve raw powder is added to the above suspension, and the amount of NaA molecular sieve raw powder added is 5% of the above solids;

[0049] 4) Add 3% kerosene to the above suspension, stir at high speed so that the diameter of the formed bubbles ranges from 80-120um, and carry out cyclone air flotation treatment through a cyclone air flotation device with a diameter of 0.4m, and add water to the foam phase to dilute to a solid content of 8.4 %, the water phase is dehydrated to the same concentration;

[0050] 4) Add binder and dispersant to the above-mentioned foam phase and water phase respectively to continue to disperse evenly;

[0051] 5) Coating the above-mentioned suspension on th...

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Abstract

The invention relates to a method for repairing a support body for preparing a molecular sieve membrane. Specifically, a ceramic support body surface defect repairing technology is applied to preparation of the molecular sieve membrane, and the method comprises the following steps: dispersing molecular sieve raw powder into ceramic slurry, uniformly coating the surface of the support body with the ceramic slurry, conducting drying, and conducting sintering at low temperature to effectively repair the macropore defect on the surface of the original support body. While the surface structure and property of an original support body are maintained, the introduced molecular sieve raw powder can strengthen the combination effect between the molecular sieve membrane layer and the support body layer, and the performance of the molecular sieve membrane can be effectively improved when the molecular sieve raw powder is used for preparing the molecular sieve membrane.

Description

technical field [0001] The invention relates to the field of ceramic support preparation, in particular to the repair of surface defects of the ceramic support and the application of the repaired support in the preparation of molecular sieve membranes. Background technique [0002] With the gradual maturity of the molecular sieve membrane application market, the market demand for molecular sieve membranes is increasing, and higher requirements are put forward for the performance of molecular sieve membranes, especially the flux level. Improving the flux of the membrane can significantly reduce the equipment cost. Studies have shown that the pore size of the support has a great influence on the membrane flux. For ceramic supports with an average pore size of 1.0um and 2.0um, the water flux of the latter is 1.5 times that of the former. Therefore, within a certain range, the larger the pore size of the support, the more favorable the membrane flux. However, as the pore size ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/10B01D71/02B01D67/00B01D17/00C04B41/87
CPCB01D69/105B01D71/028B01D67/0044B01D17/00C04B41/87C04B41/5042C04B41/5041C04B41/5037C04B41/5027C04B41/4576C04B41/4539C04B41/0072
Inventor 朱月馨杨占照纪祖焕丁宏权庆天
Owner JIANGSU NINE HEAVEN HIGH TECH
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