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Quasi-crystalline hydrated magnesium-aluminium hydroxy carboxylates, their preparation and their use

A technology for hydrating magnesium hydroxycarboxylate and hydrating hydroxycarboxylic acid is applied in the field of preparing magnesium-aluminum solid solution and anionic clay, and can solve the problems of limiting the operating conditions of the preparation method, equipment corrosion and the like

Inactive Publication Date: 2004-04-21
AKZO NOBEL NV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the alkaline reaction environment causes corrosion to the equipment and limits the operating conditions for its preparation method and any subsequent reaction

Method used

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  • Quasi-crystalline hydrated magnesium-aluminium hydroxy carboxylates, their preparation and their use
  • Quasi-crystalline hydrated magnesium-aluminium hydroxy carboxylates, their preparation and their use
  • Quasi-crystalline hydrated magnesium-aluminium hydroxy carboxylates, their preparation and their use

Examples

Experimental program
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Effect test

Embodiment 1

[0060]The magnesium acetate solution was prepared as follows. To deionized water (1108 g) was added glacial acetic acid (996 g). To this solution, 335 g of MgO (Spectrum Chemical Company; Hoavy USPpower; MA125) was slowly added with stirring until the MgO was completely dissolved, resulting in a solution with a pH of 5.45.

Embodiment 2

[0062] An alumina sol was prepared by adding 50.0 g of Catapal A(R) to a mixture of 3.45 g of glacial acetic acid and 245.0 g of deionized water and mixing in a Waring mixer at high speed for 15 minutes. To the resulting mixture was added 103.4 g of the magnesium acetate solution of Example 1. The resulting mixture was mixed in a mixer for 20 minutes to obtain a gel having a pH of 5.53 and a Mg / Al molar ratio of 0.5. The gel was aged at 80°C for 27 hours in a closed container. The product was dried in an oven at 100°C overnight and ground to a fine powder.

[0063] figure 1 The PXRD pattern of the sample obtained by using CuK-α rays with a wavelength of 1.5418 Å is shown. The spectrum contains the characteristic reflection of unreacted pseudoboehmite and two reflections of the QCC at about 9° and 24° 2Θ, corresponding to intervals of about 11.1 and 3.7 Å. The reflection of the pseudo-boehmite phase hides a third QCC reflection near 38° 2θ (2.4 Å). figure 1 Also shown is...

Embodiment 3

[0065] Example 2 was repeated except that 413.5 g of magnesium acetate solution was used, resulting in a Mg / Al ratio of 2.0. The pH of the gel was 5.45. figure 2 The PXRD pattern of the product is shown. This pattern indicates the formation of QCC and pseudoboehmite. figure 2 Also shown is the PXRD pattern of this sample after calcination at about 732°C and subsequent rehydration. These patterns show that after calcination, both spinel and Mg / Al solid solution are present. By rehydrating the calcined material, the solid solution was transformed into anionic clay, brucite and magnesia.

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Abstract

The present invention provides new compositions of matter, referred to as quasi-crystalline carboxylates (QCCs), their preparation and use. The materials comprise a quasi-crystalline hydrated magnesium-aluminium hydroxy carboxylate and are characterised by the presence of at least a strong reflection in the powder X-ray diffraction pattern at a basal spacing in the range of 5 to 15 ANGSTROM . The invention further relates to a process for preparing the QCCs, Mg-Al solid solutions and anionic clays under acidic conditions. The QCC is prepared by aging an acidic mixture of a magnesium carboxylate and an aluminium source. Calcination of the QCC results in a Mg-Al solid solution; rehydration of this solid solution gives an anionic clay.

Description

field of invention [0001] The present invention relates to a composition containing quasi-crystal hydrated magnesium aluminum hydroxycarboxylate, its preparation and use in catalyst composition. The present invention also relates to the preparation of magnesium aluminum solid solutions and anionic clays by using carboxylate compositions as intermediates. background of the invention [0002] It is an object of the present invention to provide a novel process for the preparation of anionic clays. Various terms are used to describe such materials, referred to in this specification as anionic clays. Those skilled in the art may use the terms hydrotalcite-type and layered double hydroxide interchangeably. In this specification we refer to these materials as anionic clays, including those within the term known as hydrotalcite-type and layered double hydroxide materials. [0003] Anionic clays have many applications. These applications include, but are not limited to: catalysts...

Claims

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Application Information

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IPC IPC(8): B01J21/00B01J21/16B01J23/00B01J31/04C01F7/162C01F7/785C07C51/41C07C53/06C07C53/10
CPCB01J21/16C07C51/412C01P2002/72B01J23/007C01F7/162C01P2002/22C01F7/005C01P2002/50C01F7/785C07C53/10C07C53/06C07C51/41
Inventor D·施塔米雷斯T·J·平纳瓦亚M·布雷迪
Owner AKZO NOBEL NV
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