公开(公告)号：US5855860A

公开(公告)日：1999-01-05

申请号：US848271

申请日：1997-04-29

申请人： Masanobu Nishimine ,  Yoshio Tomizawa ,  Hidekazu Uehara ,  Kiyoshi Shirasuna ,  Susumu Ueno

发明人： Masanobu Nishimine ,  Yoshio Tomizawa ,  Hidekazu Uehara ,  Kiyoshi Shirasuna ,  Susumu Ueno

IPC分类号： C01B33/18 ,  C01B33/12

CPC分类号： C01B33/183 ,  C01B33/18 ,  C01P2006/12 ,  C01P2006/80

摘要： Crude fumed silica resulting from pyrogenic hydrolysis is purified by continuously feeding particulate silica and steam or a mixture of steam and air in a steam/air volume ratio of at least 1/2 through an upright column from its bottom toward its top for forming a fluidized bed within the column at a gas linear velocity of 1 to 10 cm/sec. and a temperature of 250.degree. to 400.degree. C., whereby steam deprives the particulate silica of the halide borne thereon, and removing fine particulate silica from which the halide has been eliminated from the top of the column. Using a simple apparatus, pure fine particulate silica is collected at a low cost of energy consumption.

摘要翻译： 由热解水解产生的粗制热解法二氧化硅通过从其底部向其顶部连续供给颗粒二氧化硅和蒸汽或蒸汽和空气的混合物，其蒸汽/空气体积比至少为1/2，通过立柱从而形成流化床 在柱内以1至10cm / sec的气体线速度进行床。 在250-400℃的温度下蒸发除去其上所含卤化物的颗粒状二氧化硅，并从柱顶部除去已经从其中除去卤化物的微细二氧化硅。 使用简单的装置，以低成本的能量消耗收集纯的细颗粒二氧化硅。

公开(公告)号：US06696034B2

公开(公告)日：2004-02-24

申请号：US09941727

申请日：2001-08-30

申请人： Yasuaki Nozawa ,  Kiyoshi Shirasuna ,  Hidekazu Uehara ,  Keiji Shibata ,  Susumu Ueno

发明人： Yasuaki Nozawa ,  Kiyoshi Shirasuna ,  Hidekazu Uehara ,  Keiji Shibata ,  Susumu Ueno

IPC分类号： C09C130

CPC分类号： C09C1/3081 ,  C01B33/18 ,  C01P2006/12 ,  C01P2006/80 ,  C01P2006/90 ,  Y10T428/2993

摘要： Hydrophobic silica fine powder is produced by pyrolyzing a silane compound to form a silica fine powder and hydrophobizing the silica fine powder with an organohalosilane as hydrophobizing agent in a fluidization vessel. A portion of the silica fine powder is bypassed to a waste gas line from the fluidization vessel and collected with a cyclone and bag filter, and the collected powder is fed to the fluidization vessel where it is hydrophobized. The amount of unreacted organohalosilane in the waste gases is reduced, alleviating the burden on waste gas treatment. The silica having the unreacted organohalosilane borne thereon is fed back to the fluidization vessel, increasing the reaction efficiency of organohalosilane.

摘要翻译： 疏水性二氧化硅细粉末是通过热解硅烷化合物形成二氧化硅细粉末，并将二氧化硅细粉末与作为疏水化剂的有机卤代硅烷在流化槽中疏水化而制造的。 二氧化硅细粉末的一部分从流化槽旁路到废气管线，并用旋风分离器和袋式过滤器收集，并将收集的粉末进料到流化槽中进行疏水化。 废气中未反应的有机卤代硅烷的量减少，减轻了废气处理的负担。 将其上承载有未反应的有机卤代硅烷的二氧化硅反馈给流化槽，提高有机卤代硅烷的反应效率。

公开(公告)号：US06749823B2

公开(公告)日：2004-06-15

申请号：US09941742

申请日：2001-08-30

申请人： Yasuaki Nozawa ,  Kiyoshi Shirasuna ,  Masanori Akiyama ,  Takayuki Matsuzawa

发明人： Yasuaki Nozawa ,  Kiyoshi Shirasuna ,  Masanori Akiyama ,  Takayuki Matsuzawa

IPC分类号： C01B3312

CPC分类号： C09C1/3081 ,  C01P2004/50 ,  C01P2006/12 ,  C01P2006/90

摘要： Hydrophobic silica fine powder is produced by pyrolyzing a silane compound to form a silica fine powder and hydrophobizing the silica fine powder with an organohalosilane in a fluidization vessel. Hydrophobized silica fine powder which flies out of the fluidization vessel is collected with a cyclone and bag filter which are held at a temperature of 100-500° C. An apparatus for carrying out the process is also provided. Under simple controlled conditions that involve holding the cyclone and bag filter for recovering fugitive silica from the fluidization vessel to temperatures of 100-500° C., the method and apparatus are able to recover essentially 100% of fugitive silica, thus increasing yield of the product and alleviating the burden on waste gas treatment.

摘要翻译： 疏水性二氧化硅细粉末是通过将硅烷化合物热解形成二氧化硅细粉末，并且在流化槽中将二氧化硅细粉末与有机卤代硅烷疏水化而制造的。 用旋转除尘器和袋式过滤器收集流出流化槽的疏水性二氧化硅细粉末，保持在100-500℃的温度。还提供了一种用于进行该方法的设备。 在简单的控制条件下，包括将旋流器和袋式过滤器用于将流化槽中的挥发性二氧化硅回收至100-500℃的温度，该方法和设备能够基本上回收100％的逸散性二氧化硅，从而提高 产品，减轻废气处理负担。