# US 2010/0166642 A1 · Method for producing alumina

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- Number: US 2010/0166642 A1
- Document ID: US20100166642A1
- Status: Published application
- Kind: A1
- Application number: 12/647,673
- Filed: 2009-12-28
- Published: 2010-07-01
- Earliest claimed: 2008-12-25
- Assignees: Sumitomo Chemical Company, Limited
- Inventors: Noriaki FUJITA; Shinji FUJIWARA
- Web page: https://patentgrep.com/patent/US20100166642A1

## CPC

- C01F 7/36: from organic aluminium salts
- C01F 7/44: Dehydration of aluminium oxide or hydroxide, i.e. all conversions of one form into another involving a loss of water
- C01F 7/441: by calcination
- C01P 2004/61: Micrometer sized, i.e. from 1-100 micrometer
- C01P 2004/62: Submicrometer sized, i.e. from 0.1-1 micrometer
- C01P 2006/11: Powder tap density
- C01P 2006/12: Surface area
- C01F: COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS (metal hydrides {monoborane, diborane or addition complexes thereof} C01B6/00; salts of oxyacids of halogens C01B11/00; peroxides, salts of peroxyacids C01B15/00; sulfides or polysulfides of magnesium, calcium, strontium, or barium C01B17/42; thiosulfates, dithionites, polythionates C01B17/64; compounds containing selenium or tellurium C01B19/00; binary compounds of nitrogen with metals C01B21/06; azides C01B21/08; {compounds other than ammonia or cyanogen containing nitrogen and non-metals and optionally metals C01B21/082; amides or imides of silicon C01B21/087}; metal {imides or} amides C01B21/092, {C01B21/0923}; nitrites C01B21/50; {compounds of noble gases C01B23/0005}; phosphides C01B25/08; salts of oxyacids of phosphorus C01B25/16; carbides C01B32/90; compounds containing silicon C01B33/00; compounds containing boron C01B35/00; compounds having molecular sieve properties but not having base-exchange properties C01B37/00; compounds having molecular sieve and base-exchange properties, e.g. crystalline zeolites, C01B39/00; cyanides C01C3/08; salts of cyanic acid C01C3/14; salts of cyanamide C01C3/16; thiocyanates C01C3/20; {double sulfates of magnesium with sodium or potassium C01D5/12; with other alkali metals C01D15/00, C01D17/00})
- C01P: INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS

## Abstract

A method for producing alumina comprising the steps of mixing an aqueous medium in an amount of 20 parts by weight or more and 300 parts by weight or less with 100 parts by weight of a first dry powdery aluminum hydroxide prepared by an aluminum alkoxide method to give a wet powdery aluminum hydroxide; drying the wet powdery aluminum hydroxide by an agitation drying system to give a second dry powdery aluminum hydroxide; and calcining the second dry powdery aluminum hydroxide to give alumina having a high bulk density.

## Claims

### Claim 1

A method for producing alumina comprising the steps of:
mixing an aqueous medium in an amount of 20 parts by weight or more and 300 parts by weight or less with 100 parts by weight of a first dry powdery aluminum hydroxide prepared by an aluminum alkoxide method to give a wet powdery aluminum hydroxide;
drying the wet powdery aluminum hydroxide by an agitation drying system to give a second dry powdery aluminum hydroxide; and
calcining the second dry powdery aluminum hydroxide to give alumina.

### Claim 2 (depends on 1)

The method according to claim 1, wherein said aqueous medium is water.

### Claim 3 (depends on 1)

The method according to claim 1, wherein the amount of the aqueous medium is 50 parts by weight or more and 180 parts by weight or less per 100 parts by weight of the first dry powdery aluminum hydroxide.

### Claim 4 (depends on 1)

The method according to claim 1, wherein the calcination is performed in atmospheric air.