基本信息:
- 专利标题: PRODUCTION OF FUMED SILICA
- 专利标题(中):生产二氧化硅
- 申请号:PCT/US2000/007689 申请日:2000-03-21
- 公开(公告)号:WO01012544A1 公开(公告)日:2001-02-22
- 主分类号: C01B7/19
- IPC分类号: C01B7/19 ; C01B33/18 ; C01C1/244 ; C01D5/00 ; C01F7/14 ; C01F7/26 ; C01F7/50 ; C01F7/56 ; C01F11/24 ; C01F11/46 ; C03C1/00 ; C04B7/24 ; C04B18/04 ; C04B35/185 ; C04B35/622 ; C22B21/00 ; C01B33/12 ; C01B33/08 ; C01F7/02
摘要:
A method for producing fumed silica and a fluorine-containing product from a source of silica in solid form and a solid material containing fluorine, the solid material selected from the group consisting of sodium aluminum tetrafluoride, cryolite, aluminum fluosilicate, ammonium bifluoride, sodium aluminum silicofluoride, and sodium flurosiliate. The method comprises the steps of digesting the silica in solid form and the solid material selected from the group consisting of sodium aluminum tetrafloride, cryolite, aluminum fluosilicate, ammonium bifluoride, sodium aluminum silicofluoride, and sodium flurosiliate in a sulfuric acid digester. The digesting step produces a first gas component comprised of silicon tetrafluoride, hydrogen fluoride and water vapor. The first gas component is removed from the digester. The gas component recovered from the digester is heated to a temperature sufficiently high to convert the silicon tetrafluoride to fumed silica in the presence of the hydrogen fluoride and the fumed silica is separated from the hydrogen fluoride.
摘要(中):
从固体形式的二氧化硅源和含氟的固体材料制备热解法二氧化硅和含氟产物的方法,选自四氟化铝铝,冰晶石,氟硅酸铝,氟化铵铵,钠铝的固体材料 硅氟化物和氟化钠。 该方法包括以下步骤:将固体形式的二氧化硅和在硫酸蒸煮器中选自四氟化硼铝,冰晶石,氟硅酸铝,氟化铵铵,氟化铝钠,氟化钠铝等的固体物质进行消化。 消化步骤产生由四氟化硅,氟化氢和水蒸气组成的第一气体组分。 将第一气体成分从蒸煮器中取出。 将从蒸煮器回收的气体组分加热至足够高的温度,以在氟化氢存在下将四氟化硅转化成热解法二氧化硅,并将热解二氧化硅与氟化氢分离。