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A kind of preparation method of molecular sieve membrane support body

A technology of molecular sieve membrane and support, which is applied in the field of preparation of ceramic supports, can solve the problems of powder agglomeration, uneven mud mixing, unfavorable industrial production, etc., and achieve uniform performance distribution, wide application range, simple and economical process Effect

Active Publication Date: 2017-11-07
JIANGSU NINE HEAVEN HIGH TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing ceramic support preparation process is basically prepared by mixing ceramic aggregate with various binders, pore-forming agents, etc. in a dry or wet method and then prepared by a certain molding method. The existing process usually has Agglomeration of various powders, uneven mixing of mud materials, and weak joints at the neck of ceramic aggregate particles, etc., resulting in uneven distribution of the performance of the entire support body, and the acid and alkali corrosion resistance of the support body is not as high as expected.
[0004] At present, the preparation methods described in the relevant patents on the preparation technology of ceramic supports are mostly the preparation methods of supports with a pore size larger than 5 μm, and most of them are dry mixing, which has the defect of uneven mud mixing. At the same time, there are few mentions Acid and alkali corrosion resistance of the support
The patent of Publication No. CN101139206A provides a method for preparing a ceramic support body with an ultra-fine crystal nucleus suspension as a sintering aid, which overcomes the defect that the sintering aid is easy to agglomerate and the support body has better acid and alkali corrosion resistance, but the method exceeds The preparation of the fine crystal nucleus suspension is too cumbersome, which is not conducive to industrial production, and the support described in this patent is a support with a pore diameter greater than 3 μm
The patent with publication number CN104140284A provides a method for preparing ceramic supports with a pore size below 2 μm, but this method is limited to the preparation of flat supports

Method used

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  • A kind of preparation method of molecular sieve membrane support body

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1) Take 10kg of mullite fine powder with an average particle size of 6μm as ceramic powder aggregate, add 500g of starch with a particle size of less than 5μm, and mix well;

[0034] 2) Add 500g of nano-alumina dispersion with a content of 40wt%, 500g of hydroxypropyl methylcellulose, 1kg of polyethylene glycol, 1kg of Glycerin, stir evenly, stale for 12 hours to make mud;

[0035] 3) The mud material is subjected to vacuum refining and aging for 48 hours, and then extruded to obtain a single-tube porous molecular sieve membrane support wet billet;

[0036] 4) Place the wet billet at 30°C and 80% relative humidity to dry naturally for 48 hours, and dry to obtain a green billet;

[0037] 5) Hang the green body in a sintering furnace, sinter at 1500°C for 4 hours, and then cool naturally to obtain a molecular sieve membrane support.

[0038] The obtained support was characterized, with an average pore size of 1.3 μm and a porosity of 35%. Boiling in 10% sodium hydroxid...

Embodiment 2

[0040] 1) Take 8kg of α-alumina with an average particle size of 5μm and 2kg of silica with an average particle size of 3μm as ceramic powder aggregate, add 300g of activated carbon with a particle size of less than 3μm, and mix well;

[0041] 2) Add 400g of aluminum sol with a content of 40%, 500g of paraffin, 1kg of polyvinyl alcohol, and 1kg of tung oil to the mixed powder obtained in step 1) in sequence by spraying while stirring, stir evenly, and stale for 24 hours to make mud material;

[0042] 3) The mud material is subjected to vacuum refining and aging for 24 hours, and then extruded to obtain a four-channel porous molecular sieve membrane support body wet billet;

[0043] 4) Place the wet billet at 25°C and 60% relative humidity to dry naturally for 56 hours, and dry to obtain a green billet;

[0044] 5) Hang the green body in a sintering furnace, sinter at 1600°C for 6 hours, and then cool naturally to obtain a molecular sieve membrane support.

[0045] The obtain...

Embodiment 3

[0047] 1) Use 10kg of α-alumina powder with an average particle size of 2μm as ceramic powder aggregate, add 600g of activated carbon with a particle size of less than 1μm, and mix well;

[0048]2) While stirring, add 400g of nano-titanium oxide dispersion with a content of 40%, 500g of paraffin, 800g of polyethylene glycol, and 1.2kg of glycerin to the mixed powder obtained in step 1) in turn by spraying, and stir evenly. Prepare mud in 24 hours;

[0049] 3) The mud material is subjected to vacuum refining and aging for 36 hours, and then extruded to obtain a four-channel porous molecular sieve membrane support body wet billet;

[0050] 4) Place the wet billet at 35°C and 70% relative humidity to dry naturally for 36 hours, and dry to obtain a green billet;

[0051] 5) Hang the green body in a sintering furnace, sinter at 1250°C for 2 hours, and then cool naturally to obtain a molecular sieve membrane support.

[0052] The obtained support was characterized, with an average...

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Abstract

The invention relates to a preparation method of a molecular sieve membrane support. After uniformly mixing ceramic powder aggregates and pore-forming agents, adding sintering aids by spraying, and adding binders, plasticizers and lubricants to prepare mud , the molecular sieve membrane support is prepared by extrusion molding and sintering. The invention uses a spraying method to add various sintering aids, which can effectively improve the uniformity of the performance of the support body. At the same time, the support body suitable for the growth of molecular sieve membrane can be prepared by adjusting the particle size and proportion of aggregate and various additives. The method of the invention has simple and economical process and wide application range.

Description

technical field [0001] The invention relates to a preparation method of a ceramic support body, in particular to a preparation method of a support body suitable for molecular sieve membrane synthesis. Background technique [0002] Molecular sieve membrane is a kind of inorganic membrane material with regular micropore structure. The pore size of this kind of membrane material is less than 1nm. The adsorption selectivity and molecular sieving characteristics of its pores make it widely used in the field of intermolecular separation. The synthesis of molecular sieve membrane needs to rely on the support suitable for molecular sieve growth. The synthesis of molecular sieve membranes is generally completed in a strong alkaline environment, so there are very strict requirements on the acid and alkali corrosion resistance of the support. There are also very high requirements, that is, the pore size is required to match the molecular sieve grain size, and the narrower the pore siz...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/02
Inventor 朱月馨杨占照纪祖焕庆祖森
Owner JIANGSU NINE HEAVEN HIGH TECH
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