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    • 2. 发明授权
    • Production of aluminum trihydroxide having median diameter of 2 to 100
microns
    • 中间体直径为2至100微米的三氢氧化铝的生产
    • US4582697A
    • 1986-04-15
    • US624669
    • 1984-06-13
    • Benoit CristolJacques Mordini
    • Benoit CristolJacques Mordini
    • A61K8/26A61Q11/00B01D9/02B01J13/02B01J19/10C01F7/02C01F7/14C01F7/34C08K3/22C09K21/02
    • C01F7/144A61K8/26A61Q11/00C01P2004/61C01P2006/12
    • A process for the production of aluminum trihydroxide having controlled median diameter of 2 to 100 microns, with a unimodal distribution and minimum deviation, by decomposing a hot supersaturated sodium aluminate solution in the presence of seed aluminum trihydroxide, separating the resultant solid and liquid phases and recovering the solid phase constituted by precipitated aluminum trihydroxide. The process comprises grinding aluminum trihydroxide until the aluminum trihydroxide has a specific BET surface area of at least 1 m.sup.2 /g, introducing the ground aluminum trihydroxide into a hot fraction of the supersaturated sodium aluminate solution to precipitate trihydroxide seed and then decomposing the remaining fraction of the supersaturated sodium alimuniate solution in the presence of the seed. This decomposition leads to the precipitation of aluminum trihydroxide having the required median diameter.
    • PCT No.PCT / FR83 / 00209 Sec。 371日期1984年6月13日 102(e)日期1984年6月13日PCT提交1983年10月18日PCT公布。 公开号WO84 / 01568 日本1984年4月26日。一种通过在种子三氢氧化铝存在下分解热过饱和铝酸钠溶液来生产中值粒径为2至100微米的单峰分布和最小偏差的三氢氧化铝的方法, 所得固相和液相,并回收由沉淀的三氢氧化铝构成的固相。 该方法包括研磨三氢氧化铝直到三氢氧化铝具有至少1m 2 / g的比BET表面积,将研磨的三氢氧化铝引入过饱和铝酸钠溶液的热级分中以沉淀三氢氧化钠种子,然后分解剩余部分 在种子存在下,过饱和的阿利膦酸钠溶液。 这种分解导致具有所需中值直径的三氢氧化铝的沉淀。
    • 4. 发明授权
    • Method of producing an aluminium trihydroxide with a large, even
particle size
    • 制造具有大,均匀粒度的三氢氧化铝的方法
    • US4614642A
    • 1986-09-30
    • US747045
    • 1985-06-06
    • Benoit CristolJacques Mordini
    • Benoit CristolJacques Mordini
    • C01F7/06C01F7/14
    • C01F7/144
    • A method of decomposing a super-saturated solution of alkali metal aluminate Ld from the Bayer process, by introducing primer Sa and forming a suspension with a high content of dry material, of at least 700 g/l of alkali metal aluminate solution to be decomposed, is characterized in that, for the purpose of obtaining Al(OH).sub.3 with a large, even particle size, a zone (Zs) for separating particularly fine solid particles of Al(OH).sub.3 is formed in decomposition zone (B) comprising a cascade of n stages of the Bayer process, the separating zone being fed with at least part L(n-3)1 of the flow of suspension Ln-3 circulating in said zone (B), from which a fraction LS.sub.1 is extracted, containing at least 5% of the total number of fine particles with a maximum diameter of 40 microns present in the flow Ln-3, while the residual suspension LS.sub.2 emerging from the separating zone Zs is recycled to zone (B), then the fraction Ls.sub.1 is treated by a known means for reducing the number of fine particles by at least 50%, and is recycled to a stage in the Bayer process.
    • PCT No.PCT / FR84 / 00195 Sec。 371日期:1985年6月6日 102(e)日期1985年6月6日PCT提交1984年9月4日PCT公布。 出版物WO85 / 01040 1985年3月14日。一种从拜耳法中分解碱金属铝酸盐Ld的超饱和溶液的方法,通过引入底物Sa并形成至少700g / l的干物质的高含量的悬浮液 要分解的碱金属铝酸盐溶液的特征在于,为了获得具有大的甚至粒径的Al(OH)3的目的,形成用于分离特别细的Al(OH)3的细小固体颗粒的区域(Zs) 在包括拜耳方法的n级级联的分解区(B)中,分离区被供给在所述区(B)中循环的悬浮液Ln-3流的至少一部分L(n-3)1, 其中提取了一部分LS1,其含有流Ln-3中存在的最大直径为40微米的细颗粒总数的至少5%,而从分离区Zs排出的残留悬浮液LS2被再循环到区 B),则通过用于减少f的数量的已知方法来处理分数Ls1 颗粒至少50%,并被再循环到拜耳法中的一个阶段。