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Process for producing hydrotalcite-like layered hydroxide

A layered hydroxide and production method technology, applied in chemical instruments and methods, other chemical processes, etc., can solve problems such as complex process, low yield, pollution, etc., and achieve high-quality, high-yield effects

Inactive Publication Date: 2007-05-16
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, many of these existing technologies have problems such as complex process, intermittent production, pollution, and low yield.

Method used

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  • Process for producing hydrotalcite-like layered hydroxide
  • Process for producing hydrotalcite-like layered hydroxide
  • Process for producing hydrotalcite-like layered hydroxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1536.2 grams of industrial magnesium nitrate, 748.5 grams of industrial aluminum nitrate, dissolved in deionized water to a specific gravity of 1.116; 583 grams of sodium hydroxide, 1272 grams of sodium carbonate, dissolved in deionized water to a specific gravity of 1.147. Under stirring conditions, the two solutions were neutralized at a flow rate of 5L / min, the temperature of the precipitation solution was 70°C, the pH was adjusted to 7.3, the precipitation time was controlled at 3 hours, the precipitation was completed and aged for 30 minutes, and the product was filtered and washed , dried to obtain a white powder. The XRD test results show (as shown in Figure 1), the product is a layered material with a specific surface area of ​​80m 2 / g, the pore volume is 0.40cc / g. In the waste liquid generated, Al 2 o 3 The concentration of MgO is 0, and the concentration of MgO is 0.001%.

Embodiment 2

[0024] 5120 grams of industrial magnesium nitrate, 725 grams of industrial aluminum sulfate, dissolved in deionized water to a specific gravity of 1.316; 926.5 grams of sodium hydroxide, 170.4 grams of sodium carbonate, dissolved in deionized water to a specific gravity of 1.247. Under stirring conditions, the two solutions were neutralized at a flow rate of 10L / min. The temperature of the precipitation solution was 70°C, and the pH was adjusted to 11.1. The precipitation was completed and aged for 160 minutes. The product was filtered, washed, and dried to obtain a white powder. body. The XRD test results show that the product is a layered material with a specific surface of 60m 2 / g, the pore volume is 0.50cc / g. In the waste liquid generated, Al 2 o 3 The concentration of MgO is 0, and the concentration of MgO is 0.0012%.

Embodiment 3

[0026] 3120 grams of industrial magnesium nitrate, 725 grams of industrial aluminum sulfate, dissolved in deionized water to a specific gravity of 1.316; 626.5 grams of sodium hydroxide, 170 grams of sodium carbonate, dissolved in deionized water to a specific gravity of 1.247. Under stirring conditions, the two solutions were neutralized at a flow rate of 10L / min. The temperature of the precipitation solution was 70°C, and the pH was adjusted to 9.1. The precipitation was completed and aged for 160 minutes. The product was filtered, washed, and dried to obtain a white powder. body. The XRD test results show that the product is a layered material with a specific surface of 60m 2 / g, the pore volume is 0.50cc / g. In the waste liquid generated, Al 2 o 3 The concentration of MgO is 0.0001%, and the concentration of MgO is 0.0015%.

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Abstract

The invention discloses a manufacturing method of hydrotalcite layer-shaped hydroxide, which comprises the following steps: blending bivalent metal salt solution and tervalent metal solution according to molar rate; adopting parallel flow method; adding sodium hydroxide and sodium carbonate solution; setting the sediment temperature at 40-100 Deg C; stirring; controlling the flow of parallel flow at 5-10L / min; controlling sedimenting pH value, sedimenting time and aging time; filtering; washing; drying; producing hydrotalcite layer-shaped hydroxide continuously.

Description

technical field [0001] The invention relates to an inorganic material synthesis technology, which is a production method of a hydrotalcite-type layered hydroxide. technical background [0002] Hydrotalcite (Layered Double Hydroxides) is a double hydroxyl metal composite oxide that exists in nature and has a typical layered structure. Its molecular composition is [M 2+ 1-x m 3+ x (OH) 2 ] x+ [An - x / n. mH 2 O] x- . When M in the hydrotalcite composition 2+ is a divalent cation such as Mg 2 +, Ni 2+ 、Co 2+ , Zn 2+ 、Cu 2+ Wait, M 3+ is a trivalent cation such as Al 3+ 、Cr 3+ , Fe 3+ 、Sc 3+ Wait, An - is an inorganic or organic anion such as CO 3 2- , NO 3- , OH - , SO 4 2- 、PO 4 3- etc.; at this time, this type of material has a unique anion pillared layered structure, unique anion exchangeability and laminate cation compatibility, and thus has unique application properties. Therefore, the diversification of molecular assembly can be achieved by ad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G1/02B01J20/08
Inventor 程志林马群于海斌成宏姜雪丹
Owner CHINA NAT OFFSHORE OIL CORP
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