发明名称 |
PROCESS FOR THE PREPARATION OF FINE CRYSTALLINE BOEHMITE |
摘要 |
Process for the production of boehmite (I) comprises: mixing aluminum monohydrate with a boehmite crystal structure in water to form an aqueous dispersion of the aluminum monohydrate in the water; grinding the formed dispersion, while maintaining the dispersion in a pH of 2-4 and forming boehmite seed crystals; mixing a hydrate and the boehmite seed crystals in a basic aqueous solution to form a sufficient dispersion; and heating the obtained dispersion at 110-180[deg]C to autocatalytically convert at least a substantial portion or essentially all of the aluminum monohydrate to boehmite. Process for the industrial production of boehmite (I) comprises: mixing aluminummonohydrate with a boehmite crystal structure in water to form an aqueous dispersion of the aluminum monohydrate in the water; grinding the formed dispersion, while maintaining the dispersion in a pH of 2-4 and forming boehmite seed crystals; mixing a hydrate and the boehmite seed crystals in a basic aqueous solution to form a sufficient dispersion of the hydrate and the boehmite seed crystals in the basic aqueous solution; and heating the obtained dispersion at 110-180[deg]C to autocatalytically convert at least a substantial portion or essentially all of the aluminum monohydrate to boehmite with a median grain size diameter of 50-400 nanometers and a surface of 10-40 meters squared per gram, measured by the Braunauer-Emmet-Teller method. An independent claim is included for a boehmite comprising a median grain size diameter of 50-400 nanometers, a Braunauer-Emmet-Teller surface of 10-40 meters squared per gram and a pore volume of 0.05-0.5 centimeters cubed per gram measured according to Gurwitsch method. |
申请公布号 |
EP1840085(B1) |
申请公布日期 |
2016.10.26 |
申请号 |
EP20070004497 |
申请日期 |
2007.03.06 |
申请人 |
NABALTEC AG |
发明人 |
REIMER, ALFRED, DR.;SAUERWEIN, REINER, DR.;SORGALLA, MANFRED;EDENHARTER, LUDWIG |
分类号 |
C01F7/02;C01F7/44;C08K3/22;C09K21/02 |
主分类号 |
C01F7/02 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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