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    Process for preparing pure silicon dioxide having high mechanical strength as well as silicon dioxide obtained by applying this process
    2.
    发明授权
    Process for preparing pure silicon dioxide having high mechanical strength as well as silicon dioxide obtained by applying this process 失效
    用于制备具有高机械强度的纯二氧化硅以及通过应用该方法获得的二氧化硅的方法

    公开(公告)号：US4473539A

    公开(公告)日：1984-09-25

    申请号：US493401

    申请日：1983-05-11

    申请人： Joseph J. F. Scholten ,  Abraham Van Montfoort

    发明人： Joseph J. F. Scholten ,  Abraham Van Montfoort

    IPC分类号： B01J21/08 ,  C01B33/18 ,  C01C1/16 ,  C01B33/12

    CPC分类号： C01B33/186 ,  B01J21/08 ,  C01C1/162 ,  C01P2006/12 ,  C01P2006/14 ,  C01P2006/16 ,  C01P2006/80

    摘要： Process for preparing high mechanical strength pure silicon dioxide suitable for demanding high-grade technical applications including the combination of steps of (a) forming a reaction mixture containing a silicon dioxide precipitate by controllably and gradually admixing with firm agitation an at most 15 weight percent aqueous solution of hexafluorosilicic acid with an about 15 to about 35 weight percent ammonium hydroxide solution at about 25.degree. C. to about 45.degree. C. until the pH is about 8.5 to about 9.2 in the thus formed mixture containing a silicon dioxide precipitate; (b) separating the silicon dioxide precipitate from the mixture; (c) washing the thus separated precipitate; and (d) calcining the thus washed precipitate at about 900.degree. C. to about 1500.degree. C. Silicon dioxide produced in accordance with the present process has better physical properties than commercially available porous alpha-alumina.

    摘要翻译： 适用于要求高等级技术应用的高机械强度纯二氧化硅的方法，包括以下步骤的组合：（a）通过可控地并逐渐地与强烈搅拌混合形成含有二氧化硅沉淀物的反应混合物，其含量至多为15重量％ 在约25至约35℃的温度下，将六氟硅酸与约15至约35重量％的氢氧化铵溶液的溶液混合，直至pH为约8.5至约9.2，由此形成的含有二氧化硅沉淀物的混合物; （b）从混合物中分离二氧化硅沉淀; （c）洗涤由此分离的沉淀物; 和（d）在约900℃至约1500℃下煅烧如此洗涤的沉淀物。根据本发明方法生产的二氧化硅比市售的多孔α-氧化铝具有更好的物理性能。

    Hydrogenation of benzoic acid and catalyst suitable therefor
    7.
    发明授权
    Hydrogenation of benzoic acid and catalyst suitable therefor 失效
    苯甲酸的氢化和适合的催化剂

    公开(公告)号：US5336810A

    公开(公告)日：1994-08-09

    申请号：US52358

    申请日：1993-05-07

    申请人： Paul C. Van Geem ,  Xiaoding Xu ,  Joseph J. F. Scholten

    发明人： Paul C. Van Geem ,  Xiaoding Xu ,  Joseph J. F. Scholten

    IPC分类号： B01J23/34 ,  B01J23/889 ,  B01J31/22 ,  C07B61/00 ,  C07C45/41 ,  C07C47/54 ,  C07C51/255 ,  C07D315/00 ,  C07C45/27 ,  B01J31/00 ,  B01J37/00 ,  C07C45/00

    CPC分类号： C07D315/00 ,  B01J23/34 ,  B01J23/8892 ,  C07C45/41 ,  C07C51/255

    摘要： The invention relates to a catalyst that is very suitable for the conversion of a benzoic acid into the corresponding benzaldehyde. The catalyst can be obtained via coprecipitation of a manganese salt, a salt from which an acid support is formed, a zinc salt and optionally a copper salt at a pH between 4 and 10, calcination, after precipitation, of the coprecipitate at a temperature of between 300 and 700.degree. C. and then, optionally, reduction of the calcined coprecipitate with the aid of a hydrogen-containing gas mixture. Using such a catalyst the hydrogenation of a benzoic acid can be carried out at lower temperature resulting in energy-savings and, hence, cost-savings.

    摘要翻译： 本发明涉及非常适合将苯甲酸转化成相应苯甲醛的催化剂。 催化剂可以通过锰盐，形成酸性载体的盐，锌盐和任选的铜盐在4至10的pH下共沉淀得到，沉淀后的共沉淀物在温度为 在300-700℃之间，然后任选地，借助含氢气体混合物还原煅烧的共沉淀物。 使用这样的催化剂，苯甲酸的氢化可以在较低的温度下进行，从而节约能源，因此节省成本。