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27 条记录 (耗时 0.025 秒)

    Process for producing methyl methacrylate
    3.
    发明授权
    Process for producing methyl methacrylate 失效

    公开(公告)号：US5087737A

    公开(公告)日：1992-02-11

    申请号：US529910

    申请日：1990-05-29

    申请人： Hirofumi Higuchi ,  Koichi Kida ,  Shuji Ebata

    发明人： Hirofumi Higuchi ,  Koichi Kida ,  Shuji Ebata

    IPC分类号： C07C69/54 ,  C07C67/20 ,  C07C67/22 ,  C07C231/06

    CPC分类号： C07C231/06 ,  C07C67/20 ,  Y02P20/582

    摘要： Disclosed is a process for producing methyl methacrylate which comprises:(I) a step of reacting prussic acid and acetone to form acetonecyanhydrin;(II) a step of hydrating the acetonecyanhydrin obtained in the step (I) to form .alpha.-hydroxyisobutyric acid amide;(III) a step of dehydrating the .alpha.-hydroxyisobutyric acid amide obtained in the step (II) to form methacrylic acid amide;(IV) a step of reacting the methacrylic acid amide obtained in the step (III) and methyl formate to form methyl methacrylate and formamide; and(V) a step of dehydrating formamide separated from the product obtained in the step (IV) to form prussic acid and recycling said prussic acid as a starting material in the step (I).The process produces methyl methacrylate with high selectivity without undesirable by-product such as ammonium sulfate.

    Process for preparing silica-titania catalyst
    6.
    发明授权
    Process for preparing silica-titania catalyst 失效
    制备二氧化硅 - 二氧化钛催化剂的方法

    公开(公告)号：US5587349A

    公开(公告)日：1996-12-24

    申请号：US366812

    申请日：1994-12-30

    申请人： Mariko Abe ,  Shuji Ebata ,  Takafumi Abe ,  Hirofumi Higuchi

    发明人： Mariko Abe ,  Shuji Ebata ,  Takafumi Abe ,  Hirofumi Higuchi

    IPC分类号： B01J21/06 ,  B01J21/08 ,  B01J37/03 ,  C07C67/08

    CPC分类号： B01J21/063 ,  B01J21/08 ,  B01J37/03 ,  C07C67/08

    摘要： A process for preparing a silica-titania catalyst by adding an acidic solution containing a silicon compound such as sodium silicate and a titanium compound such as titanium sulfate dissolved therein to a solution of a compound such as ammonium bicarbonate to bring about co-precipitation, in which the acidic solution is a highly concentrated nitric acid-acidic or sulfuric acid-acidic solution, and a ratio of the dissolved titanium compound in the acidic solution is regulated in a certain range.According to this process, a catalyst capable of exerting a high performance in an esterification reaction and the like can be efficiently obtained.

    摘要翻译： 一种二氧化硅 - 二氧化钛催化剂的制备方法，该方法是将含有硅化钠等硅化合物的酸性溶液和溶解在其中的硫酸钛等钛化合物的酸性溶液加入到碳酸氢铵等化合物的溶液中，进行共沉淀， 酸性溶液是高浓度硝酸 - 酸性或硫酸 - 酸性溶液，并且将溶解的钛化合物在酸性溶液中的比例调节在一定范围内。 根据该方法，可以有效地获得能够在酯化反应等中发挥高性能的催化剂。

    Process for producing hydrogen cyanide
    7.
    发明授权
    Process for producing hydrogen cyanide 失效
    生产氰化氢的方法

    公开(公告)号：US5439661A

    公开(公告)日：1995-08-08

    申请号：US330202

    申请日：1994-10-27

    申请人： Takafumi Abe ,  Shuji Ebata ,  Kazuhiro Sugamura ,  Taiji Matsuzaki ,  Hirofumi Higuchi

    发明人： Takafumi Abe ,  Shuji Ebata ,  Kazuhiro Sugamura ,  Taiji Matsuzaki ,  Hirofumi Higuchi

    IPC分类号： C01C3/02

    CPC分类号： C01C3/0204

    摘要： There is disclosed a process for efficiently producing hydrogen cyanide at a reaction temperature of preferably 250.degree. to 550.degree. C. by a catalytic dehydrative reaction of formamide which comprises employing as a catalyst, a manganese oxide (MnO) and/or a magnesium oxide (MgO) each modified with an alkali metal (Na, K, Rb, Cs, etc. ). The above process is capable of producing hydrogen cyanide at an enhanced conversion efficiency of formamide and at a high selectivity while minimizing the by-production of ammonia. The use of the catalyst comprising as a principal component, MnO modified with an alkali metal is particularly effective in prolonging its service life and enables a long-term stable operation.

    摘要翻译： 公开了通过甲酰胺的催化脱氢反应在优选250-550℃的反应温度下有效地生产氰化氢的方法，该方法包括使用氧化锰（MnO）和/或氧化镁（MnO） MgO），其用碱金属（Na，K，Rb，Cs等）修饰。 上述方法能够以提高甲酰胺的转化效率并以高选择性产生氰化氢，同时最小化氨的副产物。 使用以碱金属为主成分的催化剂MnO特别有效延长其使用寿命，能够长期稳定运行。

    Process for preparing a carboxylic acid ester
    9.
    发明授权
    Process for preparing a carboxylic acid ester 失效
    羧酸酯的制备方法

    公开(公告)号：US5703272A

    公开(公告)日：1997-12-30

    申请号：US707135

    申请日：1996-09-03

    申请人： Mariko Abe ,  Shuji Ebata ,  Takafumi Abe ,  Hirofumi Higuchi

    发明人： Mariko Abe ,  Shuji Ebata ,  Takafumi Abe ,  Hirofumi Higuchi

    IPC分类号： B01J21/06 ,  B01J21/08 ,  B01J37/03 ,  C07C67/08 ,  C07C69/02

    CPC分类号： B01J21/063 ,  B01J21/08 ,  B01J37/03 ,  C07C67/08

    摘要： A process for preparing a carboxylic acid ester which includes subjecting a carboxylic acid and an alcohol or a phenol to an esterification reaction in the presence of a silica-titania catalyst. The silica-titania catalyst is prepared by adding an acidic solution containing a silicon compound and a titanium compound dissolved therein to a solution of a basic compound to bring about co-precipitation, in which the acidic solution is a nitric acid-acidic solution or a sulfuric acid-acidic solution, a ratio of the amount (gram equivalent) of nitric acid or sulfuric acid to the amount (mol) of the silicon compound in the acidic solution is 0.5 to 50 and the amount of the titanium compound in the acidic solution is such that a ratio of titania (TiO.sub.2) in the silica-titania catalyst is 1 to 50% by weight.

    摘要翻译： 一种制备羧酸酯的方法，包括在二氧化硅 - 二氧化钛催化剂的存在下使羧酸和醇或酚进行酯化反应。 二氧化硅 - 二氧化钛催化剂通过将含有硅化合物和溶解在其中的钛化合物的酸性溶液加入到碱性化合物的溶液中来进行共沉淀，其中酸性溶液是硝酸 - 酸性溶液或 硫酸 - 酸性溶液，酸性溶液中的硝酸或硫酸的量（克当量）与硅化合物的量（摩尔）的比例为0.5〜50，酸性溶液中钛化合物的量 使得二氧化硅 - 二氧化钛催化剂中的二氧化钛（TiO 2）的比例为1〜50重量％。