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Hydrotalcite precursor adsorbent and preparation method thereof

A technology of hydrotalcite and precursor, applied in chemical instruments and methods, other chemical processes, etc., can solve the problems that the adsorption capacity of calcium oxide is not as good as that of molecular sieves, and the adsorption rate is limited, so as to achieve low cost and increase Adsorption capacity and rate, high performance effect

Active Publication Date: 2013-06-05
北京佳安氢源科技股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, compared with solid adsorbents such as molecular sieves and calcium oxide, the biggest disadvantage of hydrotalcite-based adsorbents is that the adsorption capacity at medium temperature is not as good as that of molecular sieves at room temperature, and that of calcium oxide at high temperatures (>600°C). And the adsorption rate is not as fast as the above two commonly used adsorbents.
Insufficient adsorption capacity means that more volumes of adsorbent are needed to purify the same flow rate of gas, and insufficient adsorption rate means that there are more restrictions when applied to certain industrial processes

Method used

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  • Hydrotalcite precursor adsorbent and preparation method thereof
  • Hydrotalcite precursor adsorbent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1. Weigh 1.2800g Mg(NO 3 ) 2 ·6H 2 O and 0.6250g Al(NO 3 ) 3 9H 2 O was dissolved in 50 mL of deionized water to obtain a solution in which Mg 2+ with Al 3+ The molar ratio is 3:1, Mg 2+ The concentration is 0.1 mol / L;

[0029] 2. Add 2.840g (or excessive amount) of solid stearic acid into 100 mL deionized water at 70°C, and stir evenly;

[0030] 3. Mix the two solutions obtained in steps 1 and 2 evenly, add dropwise NaOH solution with a concentration of 0.1 mol / L to make the pH of the solution system = 9, transfer the above solution to an eggplant-shaped bottle, and quickly install the device after adding the magnet On the rotary evaporator, feed nitrogen protection;

[0031] 4. Set the reaction temperature to 80 °C, turn on the magnetic stirrer, and continue feeding nitrogen for 10 h;

[0032] 5. Wash the reaction product with deionized water at 80 ℃ to make the pH = 7. After drying, grind it into powder with an agate mortar to obtain stearic acid and anion ...

Embodiment 2

[0039] 1. Weigh 3 g of purchased commercial hydrotalcite Sasol GmbH MG70 (cations are Mg and Al, anions are carbonates), and calcined at 450 °C for 18 h (under a protective gas atmosphere) to remove the original carbonate anions ;

[0040] 2. Dispose 1 g of calcined composite metal oxide and 2 g of stearic acid (excess) in a deionized aqueous solution, transfer the above solution to an eggplant-shaped bottle, add magnets and quickly install it in a rotary evaporator On, pass nitrogen protection;

[0041] 3. Set the reaction temperature to 80 °C, turn on the magnetic stirrer, and continue feeding nitrogen for 10 h;

[0042] 4. Wash the reaction product with deionized water at 80 ℃ to make the pH = 7. After drying, grind it into powder with an agate mortar to obtain stearic acid and anion-intercalated hydrotalcite, which can be filled with silica gel and soda lime in a drying dish waterproof and CO 2 save;

[0043] 5. Weigh 1 g of stearic acid and anion-intercalated hydrotal...

Embodiment 3

[0049] 1. Dissolve 1.325 g of commercial hydrotalcite Sasol GmbH MG70 and 1.53 g of sodium stearate in 150 mL of deionized water to obtain a solution;

[0050] 2. Add dilute hydrochloric acid with a concentration of 0.1 mol / L drop by drop until pH=4.0;

[0051] 3. Transfer the above solution to an eggplant-shaped bottle, quickly install it on a rotary evaporator after adding magnets, and pass it into nitrogen protection;

[0052] 4. Set the reaction temperature to 80 °C, turn on the magnetic stirrer, and continue feeding nitrogen for 10 h;

[0053] 5. Wash the reaction product with deionized water at 80 ℃ to make the pH = 7. After drying, grind it into powder with an agate mortar to obtain stearic acid and anion intercalated hydrotalcite, which can be filled with silica gel and soda lime in a drying dish waterproof and CO 2 save;

[0054] 6. Weigh 1 g of stearic acid and anion-intercalated hydrotalcite and 0.125 g of anhydrous potassium carbonate powder, place them in an eg...

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Abstract

The invention belongs to the technical field of clean energy, and in particular relates to a hydrotalcite precursor adsorbent and a preparation method thereof. After a precursor is calcined, an absorbent which is high in acidic gas adsorption capacity and high in adsorption dynamics and particularly can remove gas such as CO2 and H2S from a medium-temperature region from 200 to 400 DEG C can be provided. The adsorbent precursor is a hydrotalcite type adsorbent which is decorated by alkaline metal salt and supported by a relatively-large anion (particularly organic anions) insertion layer. The adsorbent precursor has the characteristics of alkaline metal salt decoration and organic anion insertion layer supporting, namely by the anion insertion layer supporting, the distance between the original two anion hydrotalcite layers is greatly prolonged, so that an alkaline metal salt ornament can be uniformly distributed on the surfaces of the hydrotalcite layers and among the hydrotalcite layers; the alkaline metal decoration effect is enhanced; and the gas adsorption amount and the adsorption speed of the calcined adsorbent are greatly improved.

Description

technical field [0001] The invention belongs to the technical field of clean energy, and in particular relates to a hydrotalcite precursor adsorbent and a preparation method thereof. Background technique [0002] for CO 2 、H 2 Acid gases such as S and other gases such as H 2 O, H 2 There are a variety of commercially formed solid adsorbents for the separation of Such as physical adsorption-based molecular sieve, chemical adsorption-based hydrotalcite, calcium oxide, etc. Considering CO in industrial applications 2 、H 2 The gas mixture to be treated with acid gas components such as S may have a certain temperature (medium temperature, 200~450°C). Online gas separation is one of the most energy-efficient ways. For this reason, it is necessary to find a solid adsorbent that is suitable for medium temperature and consumes less analytical energy. The selectivity of molecular sieves based on physical adsorption will decrease when the temperature rises, and they will prefe...

Claims

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Application Information

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IPC IPC(8): B01J20/08B01J20/30
Inventor 李爽史翊翔蔡宁生
Owner 北京佳安氢源科技股份有限公司
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