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Method for preparing sheet molecular sieve membrane support body by using natural attapulgite

A technology of attapulgite and attapulgite powder, which is applied in the application, household appliances, manufacturing tools and other directions, can solve the problems of poor economic benefit, easy falling off of the film surface, uneven pores, etc., and achieves clean and smooth appearance, good practical value, The effect of shape rules

Pending Publication Date: 2020-09-11
XI'AN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Commonly used supports such as quartz, metal, alumina, glass, etc. usually have the characteristics of porous, high strength, high temperature resistance, etc., but the non-valent bond between the traditional support and molecular sieve makes the surface of the film easy to fall off, and the sintering temperature High, high energy consumption, uneven pores
Chinese patent (application number: 201910112758.7, publication number: CN 109665810 A) discloses that natural clay minerals are used as raw materials to prepare molecular sieve membrane supports in situ, which will greatly reduce the cost, and the surface has active substances synthesized by molecular sieve membranes, but This molecular sieve membrane preparation method uses PVA aqueous solution as a binder, which may cause disordered bonding of the mixed powder and lead to blockage of its internal pores. In addition, the sintering temperature of the green body is 800-1200 ° C, and the energy consumption is too high. The economic benefit is not good, and the gradual temperature rise is not considered, which may easily cause cracks on the surface of the green body

Method used

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  • Method for preparing sheet molecular sieve membrane support body by using natural attapulgite
  • Method for preparing sheet molecular sieve membrane support body by using natural attapulgite
  • Method for preparing sheet molecular sieve membrane support body by using natural attapulgite

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Effect test

Embodiment 1

[0042] A method for preparing a thin molecular sieve membrane support by using natural attapulgite, specifically implemented according to the following steps:

[0043] Step 1, mix the natural attapulgite powder and soluble starch evenly according to the mass ratio of 50:3 to form a mixture; take 5g of the obtained mixture and put it into a ball mill tank with a volume of 20mL, and mix and stir evenly for 20 minutes;

[0044] Step 2: Put the uniformly mixed material in step 1 into an oven and heat at 110°C for 2 hours, take it out after drying, cool it, transfer it to a 200mL agate mortar for grinding, pass through a 200-mesh sieve to obtain a uniform powder with a diameter of no more than 75μm, and use a powder tablet machine. In a circular mold with a diameter of 20mm, the pressure is 10MPa, the pressing time is 100s, and the pressure relief time is 120s, and the molding is performed;

[0045] Step 3, put the green body obtained in step 2 in a muffle furnace, and roast it in ...

Embodiment 2

[0048] A method for preparing a thin molecular sieve membrane support by using natural attapulgite, specifically implemented according to the following steps:

[0049] Step 1, mix the natural attapulgite powder and cellulose evenly according to the mass ratio of 100:5 to form a mixture; take 5g of the obtained mixture and put it into a ball mill tank with a volume of 20mL, and mix and stir evenly for 30 minutes;

[0050] Step 2: Put the uniformly mixed material in step 1 into an oven and heat at 110°C for 2 hours, take it out after drying, cool it, transfer it to a 200mL agate mortar and grind it, pass it through a 200-mesh sieve to obtain a uniform powder with a diameter of no more than 60 μm, and use a powder tablet machine. In a circular mold with a diameter of 20 mm, the pressure is 15 MPa, the pressing time is 100 s, and the pressure release time is 120 s, and the press is formed;

[0051] In step 3, the green body obtained in step 2 is placed in a muffle furnace, and fir...

Embodiment 3

[0054] A method for preparing a thin molecular sieve membrane support by using natural attapulgite, specifically implemented according to the following steps:

[0055] Step 1, mix the natural attapulgite powder and polyethylene evenly according to the mass ratio of 100:3 to form a mixture; take 5g of the obtained mixture and put it into a ball mill tank with a volume of 20mL, and mix and stir evenly for 15 minutes;

[0056] Step 2: Put the uniformly mixed material in step 1 into an oven and heat at 110°C for 2 hours, take it out after drying, cool it, transfer it to a 200mL agate mortar and grind it, pass it through a 200-mesh sieve to obtain a uniform powder with a diameter of no more than 80 μm, and use a powder tablet machine. In a circular mold with a diameter of 20mm, the pressure is 15MPa, the pressing time is 150s, and the pressure relief time is 200s, and the molding is performed;

[0057] In step 3, the green body obtained in step 2 is placed in a muffle furnace, and ...

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Abstract

The invention discloses a method for preparing a sheet molecular sieve membrane support body from natural attapulgite, and the method comprises the following steps: putting natural attapulgite powderand a pore-forming agent into a ball-milling tank, stirring, grinding, screening, and carrying out compression molding by a powder tabletting machine to obtain a green body; roasting the green body inan air atmosphere to obtain an ATP-based support body; and then putting into a hydrothermal reaction kettle, carrying out acidification reaction with a hydrochloric acid solution, reacting at a certain temperature, washing and drying to obtain the sheet molecular sieve membrane support body. The natural attapulgite is used as a raw material; the sheet molecular sieve membrane support body is prepared by adopting a dry pressing molding and solid particle sintering method; the sheet molecular sieve membrane support body has the advantages of neat and smooth appearance, no cracks, obvious pores,acid and alkali resistance, high strength, regular shape and small thickness, maintains the original silicon-oxygen connection mode in the skeleton, provides a support body and a molecular sieve precursor for further forming amolecular sieve membrane on the surface, and has the advantages of accessible raw materials, simple operation and favorable practical value.

Description

technical field [0001] The invention belongs to the technical field of membrane material preparation, and in particular relates to a method for preparing a thin molecular sieve membrane support by using natural attapulgite. Background technique [0002] Natural attapulgite is a layered chain-shaped hydrous magnesium-rich aluminum-containing silicate mineral with a special configuration. It is a very scarce and important non-metallic mineral resource. Its structure consists of a single crystal with a rod or fiber as the basic unit. Furthermore, it is composed of rod crystal bundles formed by parallel aggregation of rod crystals and aggregates formed by stacking rod crystal bundles and rod crystals. The internal pores are complex and diverse, and the specific surface area is large. Attapulgite's unique crystal structure and physical and chemical properties determine its good cohesiveness, adsorption, and catalytic properties, so it has a wide range of applications. [0003] T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B33/13C04B33/24C04B38/06C04B33/32C04B41/91B28B3/02
CPCB28B3/02C04B33/1305C04B33/24C04B33/32C04B38/0645C04B38/067C04B41/009C04B41/5353C04B41/91C04B2235/6562
Inventor 李红玑李宁张建民房平赵孟肖强朦朦
Owner XI'AN POLYTECHNIC UNIVERSITY
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