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Process for the preparation of anionic clay

An anionic clay, clay technology, applied in chemical instruments and methods, catalyst activation/preparation, physical/chemical process catalysts, etc., can solve problems such as grinding of magnesium sources that are not mentioned

Inactive Publication Date: 2004-09-08
ALBEMARLE NETHERLANDS BV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Grinding of the magnesium source is not mentioned in this document

Method used

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  • Process for the preparation of anionic clay
  • Process for the preparation of anionic clay

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Embodiment Construction

[0036] The invention relates to a preparation of 3R 1 A method for anionic clays of the type , wherein aluminum trihydrate or its heat-treated form and a source of magnesium are fed into a reactor and aged in aqueous suspension to obtain anionic clays. The magnesium source insoluble in the reaction medium is ground prior to use or when present in the precursor mixture. The reaction between the Mg source and aluminum trihydrate or its heat-treated form results in the direct formation of anionic clays. The reaction takes place during aging at 30-100°C and ambient pressure.

[0037] In the process of the invention, carbonates, hydroxides, other anions or mixtures thereof - they are provided in the reaction medium (for example by feeding soluble salts into the reactor) or adsorbed from the atmosphere during the synthesis (for example Carbonate)—introduced into the interlayer region as an anion necessary to balance the charges.

[0038]Anionic clays prepared by the process of th...

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Abstract

This invention relates to a process for preparing a 3R1-type crystalline anionic clay comprising the steps of: a) preparing an aqueous precursor mixture comprising aluminium trihydrate or a thermally treated form thereof and a magnesium source, the magnesium source being milled before use of when present in the precursor mixture; b) aging the precursor mixture at temperatures in the range 30 DEG - 100 DEG C to obtain the crystalline clay product; and c) optionally shaping the product of step b. Milling of the magnesium source, either alone or in combination with the (thermally treated) aluminium trihydrate, results in a faster reaction and higher conversion to anionic clay. The resulting anionic clay can be obtained by simply drying the slurry retrieved from the reactor. There is no need for washing or filtering, and a wide range of ratios of Mg / Al in the reaction product is possible.

Description

Background technique [0001] The invention relates to a method for preparing Mg-Al anionic clay. [0002] Anionic clays have a crystalline structure consisting of positively charged layers composed of specific combinations of metal hydroxides with anions and water molecules in between. 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 hydroxide is the predominant anion present. [0003] In hydrotalcite-type anionic clays, the brucite-type main layers consist of octahedra alternating with interlayers in which water molecules and anions, more specifically carbonate ions, are distributed. The interlayer may contain 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 anions such as V 10 o 28 6- and Mo 7 o 24 6- ; monocarboxylates such as acetate; d...

Claims

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Application Information

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IPC IPC(8): B01J21/16B01J23/00B01J37/00C01F7/785
CPCC04B2235/3206C01P2006/21C04B35/6261B01J23/007C04B35/62815B01J37/0036C04B35/62805C01F7/005C01P2002/50B01J21/16C04B2235/3222C04B35/62645C01P2002/72C01P2002/22C01P2006/10C01P2002/78B01J37/0045B01J23/005C01F7/785C01F7/00
Inventor D·施塔米雷斯W·琼斯S·达门
Owner ALBEMARLE NETHERLANDS BV
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