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    • 2. 发明授权
    • Process for producing optically active aminoalcohol
    • 光学活性氨基醇的制备方法
    • US06743944B1
    • 2004-06-01
    • US10070365
    • 2002-03-06
    • Eiji OzakiTakakazu EndouYasumasa YamaguchiMitsuharu Hamanaka
    • Eiji OzakiTakakazu EndouYasumasa YamaguchiMitsuharu Hamanaka
    • C07C5948
    • C07C215/08C07B2200/07C07C51/412C07C213/10Y02P20/582C07C59/56C07C59/48C07C59/50
    • An industrially advantageous process for producing optically active 4-amino-2-methylbutane-1-ol which is useful as an intermediate in synthesizing optically active medicines and pesticides. Racemic 4-amino-2-methylbutane-1-ol is treated with an optically active organic acid. The diastereomeric salt thus obtained is crystallized out and subjected to solid-liquid separation to give optically active 4-amino-2-methylbutane-1-ol. The diastereomeric salt of optically active 4-amino-2-methylbutane-1-ol with an optically active reagent for optical resolution is decomposed by bringing into contact with a solvent and an alkali and subjected to solid-liquid separation, thereby recovering the optically active 4-amino-2-methylbutane-1-ol from the filtrate. Further, the filtration residue containing the alkali salt of the reagent for optical resolution obtained by the solid-liquid separation is brought into contact with a solvent and an acid. Then the reagent for optical resolution thus crystallized out is subjected to solid-liquid separation and recovered.
    • 用于制备光学活性4-氨基-2-甲基丁-1-醇的工业上有利的方法,其可用作合成光学活性药物和农药的中间体。 外消旋4-氨基-2-甲基丁-1-醇用光学活性有机酸处理。 将所得非对映体盐结晶出来,进行固液分离,得到光学活性的4-氨基-2-甲基丁-1-醇。 光学活性的4-氨基-2-甲基丁烷-1-醇与光学活性剂的光学拆分的非对映盐通过与溶剂和碱接触进行分解,进行固液分离,由此回收光学活性物质 4-氨基-2-甲基丁烷-1-醇。 此外,含有通过固液分离获得的用于光学拆分的试剂的碱金属盐的过滤残渣与溶剂和酸接触。 然后将由此结晶的光学拆分试剂进行固液分离并回收。
    • 4. 发明授权
    • Method for producing unsintered cristobalite particles
    • 生产未烧结方石英颗粒的方法
    • US5154905A
    • 1992-10-13
    • US814051
    • 1991-12-26
    • Iwao OhshimaKoichi OriiNaotake WatanabeYasumasa Yamaguchi
    • Iwao OhshimaKoichi OriiNaotake WatanabeYasumasa Yamaguchi
    • C01B33/12C01B33/18C03B19/10C04B14/06
    • C04B14/06C01B33/12C03B19/1095
    • A method for producing a nonsintered cristobalite particles comprising heating amorphous silica particles at a temperature of 1400.degree. to 1700.degree. C. in the presence of cristobalite particles (hereinafter referred to as cristobalite particles for addition and mixing) of at least 5 parts by weight based on 100 parts by weight of said amorphous silica particles to convert said amorphous silica particles to cristobalite particles with their particle form kept unchanged. According to the present invention, dense cristobalite having a low alkali content can be obtained in the form of particles. Such cristobalite is used as a filler, a dispersing agent, etc., and also as a material for high-quality artificial quartz, ceramics, etc., and particularly as a material for transparent quartz glass because of its generating no bubbles at the time of melt-molding.
    • 一种非烧结方英石颗粒的制造方法,其包括在方沸石颗粒(以下称为方石英颗粒添加和混合)存在下,在1400〜1700℃的温度下加热至少5重量份的无定形二氧化硅颗粒, 在100重量份的所述无定形二氧化硅颗粒上将所述无定形二氧化硅颗粒转化为方英石颗粒,其颗粒形式保持不变。 根据本发明,可以以颗粒的形式获得具有低碱含量的致密方英石。 这种方英石作为填料,分散剂等,也可以作为高品质的人造石英,陶瓷等的材料,特别是作为透明石英玻璃的材料,因为在此时不产生气泡 的熔融成型。