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31 条记录 (耗时 0.018 秒)

    Process for producing methyl methacrylate
    3.
    发明授权
    Process for producing methyl methacrylate 失效
    生产甲基丙烯酸甲酯的方法

    公开(公告)号：US5371273A

    公开(公告)日：1994-12-06

    申请号：US135066

    申请日：1993-10-12

    申请人： Yoshikazu Shima ,  Takafumi Abe ,  Hirofumi Higuchi

    发明人： Yoshikazu Shima ,  Takafumi Abe ,  Hirofumi Higuchi

    IPC分类号： B01J29/08 ,  C07B61/00 ,  C07C67/327 ,  C07C69/54 ,  C07C67/00

    CPC分类号： C07C67/327

    摘要： There is disclosed a process for producing methyl methacrylate through gas-phase catalytic reaction of methyl .alpha.-hydroxyisobutyrate which comprises feeding methanol in an amount by weight of 0.1 to 3.0 times the methyl .alpha.-hydroxyisobutyrate in a reactor along therewith and proceeding with the reaction at a reaction temperature in the range of 230.degree. to 300.degree. C. by the use of a transition-type synthetic faujasite zeolite having a specific lattice constant and a specific Na content (Na/Al) as the catalyst. The process is capable of stably producing the objective product having excellent quality in high yield for a long period of time while preventing the problems of early deterioration of the catalyst and coloring of reaction product.

    摘要翻译： 公开了一种通过甲基α-羟基异丁酸甲酯的气相催化反应生产甲基丙烯酸甲酯的方法，该方法包括在反应器中沿着反应器进料甲醇的量为0.1-3.0倍的甲基α-羟基异丁酸甲酯，并进行反应 通过使用具有特定晶格常数和特定Na含量（Na / Al）作为催化剂的过渡型合成八面沸石，反应温度在230℃至300℃的范围内。 该方法能够长期稳定地生产高质量的高品质的目标产物，同时防止催化剂的早期劣化和反应产物的着色。

    Process for producing methacrylic acid
    4.
    发明授权
    Process for producing methacrylic acid 失效
    生产甲基丙烯酸的方法

    公开(公告)号：US5225594A

    公开(公告)日：1993-07-06

    申请号：US759468

    申请日：1991-09-13

    申请人： Yoshikazu Shima ,  Takafumi Abe ,  Hirofumi Higuchi

    发明人： Yoshikazu Shima ,  Takafumi Abe ,  Hirofumi Higuchi

    IPC分类号： B01J23/34 ,  B01J23/72 ,  B01J23/755 ,  C07B61/00 ,  C07C51/377 ,  C07C57/04 ,  C07C57/065 ,  C07C67/20

    CPC分类号： C07C51/377 ,  C07C67/20 ,  Y02P20/582

    摘要： A process for producing methacrylic acid which comprises: (I) producing acetonecyanohydrin from prussic acid and acetone; (II) hydrating the acetonecyanohydrin obtained in step (I) to form .alpha.-hydroxyisobutyric acid amide; (III) reacting the .alpha.-hydroxyisobutyric acid amide obtained in step (II) with methyl formate or with methanol and carbon monoxide to form methyl .alpha.-hydroxyisobutyrate and formamide; (IV) hydrolyzing the methyl .alpha.-hydroxyisobutyrate obtained in step (III) to form .alpha.-hydroxyisobutyric acid; (V) dehydrating the .alpha.-hydroxyisobutyric acid obtained in step (IV) to form methacrylic acid; and (VI) dehydrating the formamide separated from the products obtained in step (III) to form prussic acid and recycling the prussic acid to step (I) as a starting material. The process is capable of producing methacrylic acid from readily available starting materials with a high yield and selectivity, without forming undesirable by-product or waste materials, such as ammonium sulfate.

    Process for preparing lactate
    5.
    发明授权
    Process for preparing lactate 失效
    制备乳酸盐的方法

    公开(公告)号：US5824818A

    公开(公告)日：1998-10-20

    申请号：US698478

    申请日：1996-08-15

    申请人： Takafumi Abe ,  Toshiyuki Gotoh ,  Takako Uchiyama ,  Hirofumi Higuchi ,  Yoshikazu Shima ,  Kazuto Ikemoto

    发明人： Takafumi Abe ,  Toshiyuki Gotoh ,  Takako Uchiyama ,  Hirofumi Higuchi ,  Yoshikazu Shima ,  Kazuto Ikemoto

    IPC分类号： C07C67/20 ,  C07C69/66

    CPC分类号： C07C67/20

    摘要： A process for preparing a lactate which includes: (a) preparing lactonitrile from prussic acid and acetaldehyde, (b) hydrating the lactonitrile to form lactamide, (c) forming the desired lactate and formamide from lactamide and formate (or methanol and carbon monoxide), (d) separating and collecting components, having a lower boiling point than that of lactate from the reaction liquid in step (c), by distillation under specified conditions, and (e) dehydrating formamide from step (d) to form prussic acid and recycling the prussic acid to step (a). Heretofore, lactates had been manufactured by forming lactonitrile (cyanohydrin) from acetaldehyde and prussic acid, and then esterifying lactonitrile with a mineral acid or the like. However, in this conventional process, ammonium salts were formed as by-products in an amount equal to that of the lactate. According to the present invention, a lactate can be efficiently manufactured on a commercial scale without forming a large amount of the ammonium salts as by-products. In particular, the yield of the lactate can be increased by controlling the formation of 2-formyloxy propionate and also a dimer of a lactate.

    摘要翻译： 一种制备乳酸的方法，其包括：（a）从丙二酸和乙醛制备乳腈，（b）使乳腈水合形成乳酰胺，（c）从乳酰胺和甲酸盐（或甲醇和一氧化碳）形成所需的乳酸盐和甲酰胺， ，（d）在步骤（c）中通过蒸馏从特定条件下蒸馏分离和收集沸点低于乳酸盐的组分，并且（e）从步骤（d）中将甲酰胺脱水形成二甲苯， 将重要的酸回收到步骤（a）。 迄今为止，已经通过从乙醛和氢溴酸形成乳腈（氰醇），然后用无机酸等使乳腈酯化来制造乳酸盐。 然而，在该常规方法中，形成铵盐，其量等于乳酸盐的副产物。 根据本发明，可以以商业规模有效地制造乳酸盐，而不会形成大量的作为副产物的铵盐。 特别地，通过控制2-甲酰氧基丙酸酯和乳酸二聚体的形成可以提高乳酸产率。

    Process for preparing 3-methyltetrahydrofuran
    6.
    发明授权
    Process for preparing 3-methyltetrahydrofuran 失效
    3-甲基四氢呋喃的制备方法

    公开(公告)号：US5663382A

    公开(公告)日：1997-09-02

    申请号：US729384

    申请日：1996-10-11

    申请人： Masaki Takemoto ,  Yoshikazu Shima ,  Takafumi Abe

    发明人： Masaki Takemoto ,  Yoshikazu Shima ,  Takafumi Abe

    IPC分类号： B01J23/86 ,  B01J31/02 ,  C07B61/00 ,  C07D307/06 ,  C07D307/08

    CPC分类号： C07D307/06

    摘要： A process for preparing 3-methyltetrahydrofuran is herein disclosed which comprises reacting a methacrylic acid ester with carbon monoxide and a lower aliphatic alcohol to obtain a methylsuccinic acid diester, and hydrogenating and dehydrating/cyclizing this methylsuccinic acid diester. According to this process, 3-methyltetrahydrofuran can efficiently be obtained from inexpensive starting materials.

    摘要翻译： 本文公开了制备3-甲基四氢呋喃的方法，其包括使甲基丙烯酸酯与一氧化碳和低级脂族醇反应，得到甲基琥珀酸二酯，并使该甲基琥珀酸二酯氢化和脱水/环化。 根据该方法，可以从廉价的原料得到3-甲基四氢呋喃。

    Process for preparing silica-titania catalyst
    7.
    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。

    Processing for producing allyl 2-hydroxyisobutyrate
    8.
    发明授权
    Processing for producing allyl 2-hydroxyisobutyrate 有权
    2-羟基异丁酸烯丙酯的加工

    公开(公告)号：US6162946A

    公开(公告)日：2000-12-19

    申请号：US387050

    申请日：1999-08-31

    申请人： Yoshikazu Shima ,  Takafumi Abe

    发明人： Yoshikazu Shima ,  Takafumi Abe

    IPC分类号： B01J31/12 ,  C07B61/00 ,  C07C67/03 ,  C07C69/675 ,  C07C69/66

    CPC分类号： C07C67/03 ,  C07C69/675

    摘要： There is disclosed a process for producing allyl 2-hydroxyisobutyrate useful as a raw material for agrochemicals and pharmaceuticals, which comprises reacting methyl 2-hydroxyisobutyrate with allyl alcohol preferably by means of reactional distillation in the presence of a transesterification catalyst preferably comprising titanium tetramethoxide or titanium tetraisopropoxide under solventless mild reaction conditions including a reaction temperature in the range of 80 to 150.degree. C. and a reaction time in the range of 10 minutes to 12 hours. The process enables efficient and easy production of the objective allyl 2-hydroxxyisobutyrate in high yield and high efficiency without the need of troublesome operations.

    摘要翻译： 公开了一种生产用作农业化学品和药物原料的2-羟基异丁酸烯丙酯的方法，其包括使2-羟基异丁酸甲酯与烯丙醇反应，优选通过在优选包含四甲氧基钛或钛的酯交换催化剂的存在下进行反应蒸馏 四异丙醇在无反应的温和反应条件下反应，反应温度为80-150℃，反应时间为10分钟至12小时。 该方法能够以高产率和高效率高效且容易地生产目标2-羟基异丁酸烯丙酯，而不需要麻烦的操作。