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Method for preparing 4A molecular sieves by doping bentonite with attapulgite

A technology of bentonite and attapulgite is applied in the field of preparing 4A molecular sieve, which can solve the problems of energy waste, large acid consumption, environmental pollution, etc., and achieve the effects of reducing waste, saving costs, and not requiring high equipment.

Inactive Publication Date: 2012-07-18
LANZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the preparation of 4A molecular sieves is generally based on the water bath preparation method. The raw materials used are all single chemical raw materials, and the cost is relatively high. In addition, the pretreatment of this preparation method either requires a large amount of acid or requires a higher temperature, which will inevitably cause environmental pollution. or energy waste

Method used

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  • Method for preparing 4A molecular sieves by doping bentonite with attapulgite
  • Method for preparing 4A molecular sieves by doping bentonite with attapulgite
  • Method for preparing 4A molecular sieves by doping bentonite with attapulgite

Examples

Experimental program
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Effect test

Embodiment 1

[0025] 61.2ml of 98% concentrated sulfuric acid was dissolved in 38.8ml of distilled water to obtain 60% sulfuric acid. Take 30g of bentonite and put it in a beaker, add 90ml of 60% sulfuric acid into the beaker, place the beaker on a constant temperature magnetic stirrer, stir, and make it react at 90°C for 12h, after it settles and separates, discard the upper layer filtrate, and acidify the lower layer Wash the white clay until neutral, dry to obtain acidified white clay, and pass through a 200-mesh sieve.

[0026] Dissolve 8.2ml of 98% concentrated sulfuric acid in 91.8ml of distilled water to obtain 8% sulfuric acid; dissolve 108g of oxalic acid in 892g of distilled water to obtain a 1.2mol / L oxalic acid solution; take 30g of attapulgite and place it in a muffle furnace Roast at 800°C for 1h, weigh 20g after cooling, add 160ml of 8% sulfuric acid, acidify at 60°C for 4h, wash until neutral after reaction, dry, add 500ml of 1.2mol / L oxalic acid and 1ml of titanium trichlor...

Embodiment 2

[0031] 61.2ml of 98% concentrated sulfuric acid was dissolved in 38.8ml of distilled water to obtain 60% sulfuric acid. Take 30g of bentonite and put it in a beaker, add 90ml of 60% sulfuric acid into the beaker, place the beaker on a constant temperature magnetic stirrer, make it react at 90°C for 12h, discard the upper layer filtrate after it settles and separate layers, and wash the lower layer with acidified clay To neutrality, dry to obtain acidified clay, and pass through a 200-mesh sieve.

[0032] Dissolve 8.2ml of 98% concentrated sulfuric acid in 91.8ml of distilled water to obtain 8% sulfuric acid; dissolve 108g of oxalic acid in 892g of distilled water to obtain a 1.2mol / L oxalic acid solution; take 30g of attapulgite and place it in a muffle furnace Roast at 800°C for 1h, weigh 20g after cooling, add 160ml of 8% sulfuric acid, acidify at 60°C for 4h, wash until neutral after reaction, dry, add 500ml of 1.2mol / L oxalic acid and 1ml of titanium trichloride after dryi...

Embodiment 3

[0037] 61.2ml of 98% concentrated sulfuric acid was dissolved in 38.8ml of distilled water to obtain 60% sulfuric acid. Take 30g of bentonite and put it in a beaker, add 90ml of 60% sulfuric acid into the beaker, place the beaker on a constant temperature magnetic stirrer, make it react at 90°C for 12h, discard the upper layer filtrate after it settles and separate layers, and wash the lower layer with acidified clay To neutrality, dry to obtain acidified clay, and pass through a 200-mesh sieve.

[0038] Dissolve 8.2ml of 98% concentrated sulfuric acid in 91.8ml of distilled water to obtain 8% sulfuric acid; dissolve 108g of oxalic acid in 892g of distilled water to obtain a 1.2mol / L oxalic acid solution; take 30g of attapulgite and place it in a muffle furnace Roast at 800°C for 1h, weigh 20g after cooling, add 160ml of 8% sulfuric acid, acidify at 60°C for 4h, wash until neutral after reaction, dry, add 500ml of 1.2mol / L oxalic acid and 1ml of titanium trichloride after dryi...

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Abstract

The invention relates to a method for synthesizing 4A molecular sieves by using bentonite and attapulgite as raw materials. The method comprises the following steps of: (1) performing acid activation on the bentonite; (2) activating the attapulgite at high temperature; (3) performing alkali treatment; (4) crystallizing; and (5) washing. According to the method, the bentonite and the attapulgite are used as the raw materials, and SiO2 in the bentonite and the attapulgite is used as a silicon source to prepare the 4A molecular sieves suitable for detergent additives. Compared with the prior art, the method has the advantages that: environmental pollution and energy waste are reduced; the preparation cost of the 4A molecular sieves is reduced; process equipment is simple and is easy to control; and new ways for developing and utilizing the bentonite and the attapulgite are opened up.

Description

technical field [0001] The invention relates to a method for preparing 4A molecular sieve by using natural mineral raw materials, in particular to a method for preparing 4A molecular sieve by doping bentonite and attapulgite. Background technique [0002] The chemical formula of 4A molecular sieve is Na 2 O·Al 2 o 3 2SiO2 2 9 / 2H 2 O; silicon aluminum than SiO 2 / Al 2 o 3 ≈2; effective aperture approx. (0.4nm). It is very easy to adsorb molecules with smaller diameters such as water, methanol, ethanol, hydrogen sulfide, sulfur dioxide, carbon dioxide, ethylene, propylene, etc., but it is difficult to adsorb molecules with a diameter larger than Any molecule (including propane) is one of the most widely used molecular sieves in industry. [0003] Each oxygen atom in the 4A molecular sieve framework is shared by two adjacent tetrahedra. This structure forms a large crystal cavity that can be occupied by cations and water molecules, and these cations and water molecu...

Claims

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Application Information

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IPC IPC(8): C01B39/18
Inventor 张有贤刘海涛李玉慧
Owner LANZHOU UNIVERSITY
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