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1. WO1996005140 - TWO POWDER SYNTHESIS OF HYDROTALCITE AND HYDROTALCITE-LIKE COMPOUNDS

Publication Number WO/1996/005140
Publication Date 22.02.1996
International Application No. PCT/US1995/000166
International Filing Date 06.01.1995
Chapter 2 Demand Filed 04.03.1996
IPC
B01J 23/00 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
23Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/113
C01B 13/36 2006.01
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF
13Oxygen; Ozone; Oxides or hydroxides in general
14Methods for preparing oxides or hydroxides in general
36by precipitation reactions in solutions
C01B 19/00 2006.01
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF
19Selenium; Tellurium; Compounds thereof
C01B 33/38 2006.01
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF
33Silicon; Compounds thereof
20Silicates
36having base-exchange properties but not having molecular sieve properties
38Layered base-exchange silicates, e.g. clays, micas or alkali metal silicates of kenyaite or magadiite type
C01F 7/00 2006.01
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
FCOMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE EARTH METALS
7Compounds of aluminium
C01G 1/00 2006.01
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
GCOMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F94
1Methods of preparing compounds of metals not covered by subclasses C01B, C01C, C01D, C01F145
CPC
B01J 23/007
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
23Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
007Mixed salts
C01B 13/363
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF; ; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
13Oxygen; Ozone; Oxides or hydroxides in general
14Methods for preparing oxides or hydroxides in general
36by precipitation reactions in ; aqueous; solutions
363Mixtures of oxides or hydroxides by precipitation
C01B 19/002
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF; ; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
19Selenium; Tellurium; Compounds thereof
002Compounds containing, besides selenium or tellurium, more than one other element, with -O- and -OH not being considered as anions
C01B 33/38
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF; ; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
33Silicon; Compounds thereof
20Silicates
36having base-exchange properties but not having molecular sieve properties
38Layered base-exchange silicates, e.g. clays, micas or alkali metal silicates of kenyaite or magadiite type
C01F 7/00
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
FCOMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
7Compounds of aluminium
C01F 7/002
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
FCOMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
7Compounds of aluminium
002Compounds containing, besides aluminium, two or more other elements, with the exception of oxygen and hydrogen
Applicants
  • ALUMINUM COMPANY OF AMERICA [US/US]; Alcoa Technical Center 100 Technical Drive Alcoa Center, PA 15069-0001, US (AllExceptUS)
  • MARTIN, Edward, S. [US/US]; US (UsOnly)
  • HORN, William, E., Jr. [US/US]; US (UsOnly)
  • STINSON, John, M. [US/US]; US (UsOnly)
  • CEDRO, Vito, III [US/US]; US (UsOnly)
Inventors
  • MARTIN, Edward, S.; US
  • HORN, William, E., Jr.; US
  • STINSON, John, M.; US
  • CEDRO, Vito, III; US
Agents
  • HANDELMAN, Joseph, H.; Ladas & Parry 26 West 61st Street New York, NY 10023 , US
Priority Data
290,22015.08.1994US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) TWO POWDER SYNTHESIS OF HYDROTALCITE AND HYDROTALCITE-LIKE COMPOUNDS
(FR) SYNTHESE D'HYDROTALCITE ET DE COMPOSES APPARENTES, A PARTIR DE DEUX POUDRES
Abstract
(EN)
There is provided an improved method for making synthetic hydrotalcite by first reacting powdered magnesium oxide with a high surface area, transition alumina in a solution or suspension to form a meixnerite-like intermediate. This intermediate is then contacted with an anion source such as an acid, and most preferably carbon dioxide, to form the layered double hydroxide which is separated from the suspension by filtering, centrifugation, vacuum dehydration or other known means. On a preferred basis, the transition alumina combined with activated magnesia consists essentially of a rehydratable alumina powder having a surface area of 100 m2/g or greater. To make related double hydroxide compounds, still other reactants such as bromides, chlorides, boric acids, or salts thereof, may be subsituted for the carbon dioxide gas fed into this suspension.
(FR)
L'invention concerne un procédé amélioré pour synthétiser de l'hydrotalcite. D'abord, on fait réagir une poudre d'oxyde de magnésium avec de la poudre d'alumine fine à surface spécifique élevée, en solution ou en suspension pour former un intermédiaire du type meixnérite. Cet intermédiaire est alors mis en contact avec une source d'anions telle qu'un acide et de préférence le gaz carbonique, pour former l'hydroxyde double lamellaire qui est isolé de la suspension par filtration ou centrifugation, puis séché sous vide ou par un autre procédé connu. Dans une forme d'exécution préférée, l'alumine fine qui est combinée avec la magnésie activée est constituée essentiellement d'une poudre d'alumine réhydratable ayant une surface spécifique de 100 m2/g ou plus. Pour réaliser des hydroxydes doubles apparentés, on peut remplacer le gaz carbonique introduit dans la suspension par d'autres réactifs tels que des bromures, des chlorures, l'acide borique ou ses sels.
Also published as
CZPV1997-469
SK199700211
SK21197
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