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Simple preparation method for high-purity houghite compound with adjustable interlayer spacing

A technology for hydrotalcites and compounds is applied in the field of preparation of hydrotalcite compounds, which can solve the problems of affecting product purity, lack of clear understanding of product washing methods and conditions, and lack of defined technical routes for hydrotalcites, and achieves simple operation and low cost. low effect

Inactive Publication Date: 2012-07-04
HENAN UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

However, in the above methods, there is no clear understanding of the washing method and conditions of the product, and the success of the washing process directly affects the purity of the product.
At the same time, there is no definite technical route for the preparation of hydrotalcites with different interlayer spacings.

Method used

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  • Simple preparation method for high-purity houghite compound with adjustable interlayer spacing

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Embodiment

[0016] Weigh 0.24mol of MgCl 2 ·6H 2 O and 0.24 / k mol of AlCl 3 9H 2 O to make 200mL salt solution (k is the ratio of magnesium to aluminum, take 2, 3, 4, 5), weigh 0.24×(2+2 / k) mol NaOH and 0.12 / k mol NaOH 2 CO 3 Dubbed 200mL of alkali solution. The salt solution and the alkali solution were dropped into 100 mL of deionized water at a controlled rate (90 drops / min) at the same time, and stirred at a medium speed with a magnetic stirrer to maintain the pH of the system at 10 and the constant temperature at 40°C. After the dropwise addition, fully stir for 20 minutes, place the resulting precipitate in a constant temperature water bath, crystallize at a constant temperature of 65°C for 18 hours, and use a conductivity of 2μs.cm -1 Centrifuge and wash the precipitate with deionized water at a centrifugal speed of 8000 rpm, and wash repeatedly until the conductivity value of the supernatant is 150 μs.cm -1 , and then the precipitate was dried at 100°C for 8h.

[0017] The ...

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Abstract

The invention provides a simple method for preparing high-purity houghite compounds, which specifically comprises the steps as follows: houghite compounds with different interlayer spacings can be obtained by adjusting the content proportioning of divalent metal and trivalent metal in raw material fluid; and through repeated centrifugal separation washing, a conductivity meter is adopted for monitoring the eluting condations of impure salt so as to obtain the high-purity houghite compound. Compared with the traditional method, the method provided by the invention has the advantages that the reaction conditions are easy to control and operate, high-purity houghite compounds with different interlayer spacings can be obtained, and the method is applicable to standardized and scale industrial production.

Description

technical field [0001] The invention relates to a preparation method of a hydrotalcite compound, belonging to the field of material synthesis. The present invention proposes a simple method for preparing high-purity hydrotalcite compounds, specifically: by adjusting the content ratio of divalent metals and trivalent metals in the raw material liquid, hydrotalcite compounds with different interlayer distances can be obtained; Centrifugal separation and washing, using a conductivity meter to monitor the elution of impurity salts to obtain high-purity hydrotalcite compounds. technical background [0002] Hydrotalcite compounds are a class of layered compounds composed of positively charged layers and negatively charged anions filled between the layers. The ideal chemical composition is Mg 6 AL 2 (OH) 16 CO 3 4H 2 O. Its layered structure can be composed of brucite Mg(OH) 2 Derived from the structure of Mg(OH) 2 Octahedrons share edges to form a unit layer, and the Mg on...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B13/14
Inventor 万东锦陈静孙旭镯王宁刘文举刘永德李道荣
Owner HENAN UNIVERSITY OF TECHNOLOGY
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