Process for producing mg-contg. non-al-anionic clay

Abstract

This patent describes economical and environment-friendly processes for the synthesis of Mg-containing non-Al anionic clays. It involves a one-step process wherein a suspension comprising a trivalent metal source and at least a magnesium containing source as a divalent metal source is reacted to obtain a magnesium-containing non-Al anionic clay. The anionic clay has interlayers containing anions comprising hydroxycarbonate, carbonate, bicarbonate, acetate, hydroxyacetate, oxalate, nitrate, hydroxyl, and / or formate or mixtures thereof. There is no necessity to wash or filter the product. It can be spray dried directly to form microspheres or can be extruded to form shaped bodies. The product can be combined with other ingredients in the manufacture of catalysts, absorbents, pharmaceuticals, cosmetics, detergents, and other commodity products that contain anionic clays.

Description

Background of the invention

[0001] The present invention relates to the preparation of magnesium-containing non-aluminum anionic clays. Anionic clays have a crystalline structure consisting of positively charged layers composed of a specific composition of metal hydroxides containing anions and water molecules between the layers. Hydrotalcite is an example of a naturally occurring anionic clay in which carbonate is the predominant anion present. Meixenite is an anionic clay in which OH - is the main anion present.

[0002] In the hydrotalcite-like anionic clay, the main layer of brucite-like is composed of alternating octahedrons with interlayers, and water molecules and various anions, especially carbonate ions, are distributed in the interlayers. The interlayer contains various anions such as NO 3 - , OH - , Cl - 、Br - , I - , SO 4 2- , SiO 3 2- , CrO 4 2- 、BO 3 2- , MnO 4 - , HGaO 3 2- 、HVO 4 2- , ClO 4 2- 、BO 3 2- ; columnar anion, V 10 o 28 6...

Examples

Embodiment 1

[0057] A slurry of gallium oxide and MgO with a Mg / Ga ratio of 2.3 was prepared. use NH 3OH to adjust the pH of the slurry to 10.2. The slurry was heat treated at 90°C for 18 hours. The product was dried at 110°C. X-ray diffraction confirmed the formation of Mg-Ga anionic clay.

Embodiment 2

[0059] A slurry of gallium oxide and MgO with a Mg / Ga ratio of 2.3 was prepared. use NH 3 OH to adjust the pH of the slurry to 10.2. The slurry was heat treated at 120°C for 18 hours. The product was dried at 110°C. X-ray diffraction confirmed the formation of Mg-Ga anionic clay.

Embodiment 3

[0061] A slurry of gallium oxide and MgO with a Mg / Ga ratio of 2.3 was prepared. use NH 3 OH to adjust the pH of the slurry to 10.2. The slurry was hydrothermally treated at 198°C for 1 hour. The product was dried at 110°C. X-ray diffraction confirmed the formation of Mg-Ga anionic clay.

Background of the invention

[0001] The present invention relates to the preparation of magnesium-containing non-aluminum anionic clays. Anionic clays have a crystalline structure consisting of positively charged layers composed of a specific composition of metal hydroxides containing anions and water molecules between the layers. Hydrotalcite is an example of a naturally occurring anionic clay in which carbonate is the predominant anion present. Meixenite is an anionic clay in which OH - is the main anion present.

[0002] In the hydrotalcite-like anionic clay, the main layer of brucite-like is composed of alternating octahedrons with interlayers, and water molecules and various anions, especially carbonate ions, are distributed in the interlayers. The interlayer contains various anions such as NO 3 - , OH - , Cl - 、Br - , I - , SO 4 2- , SiO 3 2- , CrO 4 2- 、BO 3 2- , MnO 4 - , HGaO 3 2- 、HVO 4 2- , ClO 4 2- 、BO 3 2- ; columnar anion, V 10 o 28 6...

Examples

Embodiment 1

[0057] A slurry of gallium oxide and MgO with a Mg / Ga ratio of 2.3 was prepared. use NH 3OH to adjust the pH of the slurry to 10.2. The slurry was heat treated at 90°C for 18 hours. The product was dried at 110°C. X-ray diffraction confirmed the formation of Mg-Ga anionic clay.

Embodiment 2

[0059] A slurry of gallium oxide and MgO with a Mg / Ga ratio of 2.3 was prepared. use NH 3 OH to adjust the pH of the slurry to 10.2. The slurry was heat treated at 120°C for 18 hours. The product was dried at 110°C. X-ray diffraction confirmed the formation of Mg-Ga anionic clay.

Embodiment 3

[0061] A slurry of gallium oxide and MgO with a Mg / Ga ratio of 2.3 was prepared. use NH 3 OH to adjust the pH of the slurry to 10.2. The slurry was hydrothermally treated at 198°C for 1 hour. The product was dried at 110°C. X-ray diffraction confirmed the formation of Mg-Ga anionic clay.