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    Process for continuously producing dimethyl carbonate
    1.
    发明授权
    Process for continuously producing dimethyl carbonate 失效
    连续生产碳酸二甲酯的方法

    公开(公告)号：US5514829A

    公开(公告)日：1996-05-07

    申请号：US344724

    申请日：1994-11-23

    申请人： Keigo Nishihira ,  Shinichi Yoshida ,  Shuji Tanaka

    发明人： Keigo Nishihira ,  Shinichi Yoshida ,  Shuji Tanaka

    IPC分类号： B01J8/06 ,  C07B61/00 ,  C07C68/00 ,  C07C68/08 ,  C07C69/96

    CPC分类号： C07C68/00

    摘要： A process for producing dimethyl carbonate is carried out by a first step of catalytically reacting carbon monoxide with methyl nitrite to produce dimethyl carbonate; a second step of absorbing dimethyl carbonate contained in a gas fraction withdrawn from the first step by dimethyl oxalate; a third step of regenerating methyl nitrite by contacting nitrogen monoxide contained in a gas fraction withdrawn from the second step with a molecular oxygen-containing gas and methyl alcohol; a fourth step of collecting dimethyl carbonate by distilling a liquid fraction withdrawn from the second step; and a fifth step of recovering methyl nitrite from a purge gas consisting of a portion of a regenerated gas fraction withdrawn from the third step by absorbing methyl nitrite in the purge gas by methyl alcohol to provide a methyl nitrite-containing liquid fraction and a nitrogen monoxide-containing gas fraction and bringing the gas fraction into contact with a molecular oxygen and methyl alcohol, to convert nitrogen monoxide in the gas fraction to methyl nitrite and to absorb this methyl nitrite by methyl alcohol, whereby methyl nitrite and nitrogen monoxide in the purge gas is recovered and reused with a high efficiency at a high level of safety.

    摘要翻译： 通过使一氧化碳与亚硝酸甲酯催化反应的第一步骤来制备碳酸二甲酯的方法来制备碳酸二甲酯; 从草酸二甲酯中吸收从第一步骤中排出的气体馏分中所含的碳酸二甲酯的第二步骤; 通过使从第二步骤抽出的气体馏分中含有的一氧化氮与含分子氧的气体和甲醇接触来再生亚硝酸甲酯的第三步骤; 通过蒸馏从第二步骤中抽出的液体馏分收集碳酸二甲酯的第四步骤; 以及第五步骤，从由第三步骤抽出的一部分再生气体馏分组成的吹扫气体中回收亚硝酸甲酯，通过用甲醇吸收吹扫气体中的亚硝酸甲酯，得到含有亚硝酸甲酯的液体馏分和一氧化氮 将气体馏分与分子氧和甲醇接触，将气体部分中的一氧化氮转化成亚硝酸甲酯，并用甲醇吸收该亚硝酸甲酯，由此吹扫气中的亚硝酸甲酯和一氧化氮 在高安全性下以高效率回收和再利用。

    Process for producing alkyl nitrite
    2.
    发明授权
    Process for producing alkyl nitrite 有权
    亚硝酸烷基酯的制备方法

    公开(公告)号：US06191302B1

    公开(公告)日：2001-02-20

    申请号：US09176372

    申请日：1998-10-21

    申请人： Keigo Nishihira ,  Shuji Tanaka ,  Shinichi Yoshida

    发明人： Keigo Nishihira ,  Shuji Tanaka ,  Shinichi Yoshida

    IPC分类号： C07C20302

    CPC分类号： C07C201/04 ,  C07C203/00

    摘要： An alkyl nitrite can be produced on an industrial scale with a high efficiency and with a low yield of by-products by the process wherein nitrogen oxide-containing feed gas is brought into an alkyl alcohol liquid in a distillation column reactor while circulating a liquid fraction, produced in the reactor and containing the alkyl alcohol, through a circulation path including a lower section of the reactor and a cooler to remove the reaction heat vigorously generated in the reactor, and while controlling the weight ratio of the circulating liquid fraction to the total alkyl alcohol fed into the reactor to 50:1 to 200:1, the molar ratio of the total alkyl alcohol fed to the reactor and contained in the circulating liquid fraction to nitrogen oxide in the feed gas to 20:1 to 150:1, and the content of the alkyl alcohol in the liquid fraction to 15 to 60% by weight; and the resultant gas fraction containing the target alkyl nitrite is collected from the reactor.

    摘要翻译： 亚硝酸烷基酯可以在工业规模上以高效率和低产率的副产物生产，其中将含氮氧化物的进料气体在蒸馏塔反应器中进入烷基醇液体，同时使液体馏分 在反应器中生产并含有烷基醇，通过包括反应器的下部的循环路径和冷却器，以除去在反应器中剧烈产生的反应热，同时控制循环液体馏分与总的重量比 将进料到反应器中的烷基醇的摩尔比为50:1至200:1，进料到反应器中并且包含在循环液体馏分中的总烷基醇与进料气体中的氮氧化物的摩尔比为20:1-150:1， 并且液体馏分中的烷基醇的含量为15〜60重量％ 从反应器收集含有目标亚硝酸烷基酯的所得气体馏分。

    Process for continuously producing dimethyl carbonate
    3.
    发明授权
    Process for continuously producing dimethyl carbonate 失效
    连续生产碳酸二甲酯的方法

    公开(公告)号：US5631396A

    公开(公告)日：1997-05-20

    申请号：US647164

    申请日：1996-05-09

    申请人： Keigo Nishihira ,  Shinichi Yoshida ,  Shuji Tanaka ,  Yutaka Asada

    发明人： Keigo Nishihira ,  Shinichi Yoshida ,  Shuji Tanaka ,  Yutaka Asada

    IPC分类号： B01J27/13 ,  C07B61/00 ,  C07C68/00 ,  C07C68/08 ,  C07C69/96

    CPC分类号： C07C68/00

    摘要： Dimethyl carbonate ((CH.sub.3 O).sub.2 CO) is continuously produced by a catalytic reaction (first step) of CO with CH.sub.3 NO.sub.2, with a significantly reduced loss of CH.sub.3 ONO by the process including a second step wherein (CH.sub.3 O).sub.2 CO in a reaction product gas of the first step is absorbed by dimethyl oxalate while contacting the resultant liquid fraction with CO to recover CH.sub.3 ONO, a third step wherein CH.sub.3 ONO is regenerated from NO in the condensed gas fraction produced in the second step and molecular oxygen and CH.sub.3 OH introduced into the third step, the resultant regenerated gas fraction being recycled and reused as a feed gas for the first step, and a fourth step wherein (CH.sub.3 O).sub.2 CO contained in the liquid fraction of the second step is collected.

    摘要翻译： 通过CO与CH3NO2的催化反应（第一步）连续制备碳酸二甲酯（（CH 3 O）2 CO），通过包括第二步骤的CH 3 NOO的显着降低的损失，其中（CH 3 O）2 CO在反应产物气体中的 第一步被草酸二甲酯吸收，同时使所得液体馏分与CO接触以回收CH 3 NOO，第三步是在第二步产生的冷凝气体馏分中从NO再生CH3ONO，并将第三步中引入分子氧和CH3OH， 所产生的再生气体馏分被再循环并重新用作第一步骤的进料气体;以及第四步骤，其中收集第二步骤的液体馏分中所含的（CH 3 O）2 CO。

    Process for continuously producing dimethyl carbonate
    4.
    发明授权
    Process for continuously producing dimethyl carbonate 失效
    连续生产碳酸二甲酯的方法

    公开(公告)号：US5534648A

    公开(公告)日：1996-07-09

    申请号：US345568

    申请日：1994-11-28

    申请人： Keigo Nishihira ,  Shinichi Yoshida ,  Shuji Tanaka

    发明人： Keigo Nishihira ,  Shinichi Yoshida ,  Shuji Tanaka

    IPC分类号： C07C68/00 ,  C07C69/96

    CPC分类号： C07C68/00

    摘要： A process for producing dimethyl carbonate is carried out by a first step of catalytically reacting carbon monoxide with methyl nitrite to produce dimethyl carbonate; a second step of absorbing dimethyl carbonate contained in a gas fraction withdrawn from the first step by dimethyl oxalate; a third step of regenerating methyl nitrite by contacting nitrogen monoxide contained in a gas fraction withdrawn from the second step with a molecular oxygen-containing gas and methyl alcohol; a fourth step of collecting dimethyl carbonate by distilling a liquid fraction withdrawn from the second step; and a fifth step of producing and recovering methyl nitrite from a purge gas consisting of a minor portion of a gas fraction withdrawn from one of the second step and the third step by bringing the purge gas together with an ammonia-oxidation product gas into contact with methyl alcohol in a methyl nitrite-recovering column, to thereby produce and recover methyl nitrite contained in the recovering column with a high efficiency at a high level of safety.

    摘要翻译： 通过使一氧化碳与亚硝酸甲酯催化反应的第一步骤来制备碳酸二甲酯的方法来制备碳酸二甲酯; 从草酸二甲酯中吸收从第一步骤中排出的气体馏分中所含的碳酸二甲酯的第二步骤; 通过使从第二步骤抽出的气体馏分中含有的一氧化氮与含分子氧的气体和甲醇接触来再生亚硝酸甲酯的第三步骤; 通过蒸馏从第二步骤中抽出的液体馏分收集碳酸二甲酯的第四步骤; 以及第五步骤，通过将吹扫气体与氨氧化产物气体一起与氨氧化产物气体接触而从由第二步骤和第三步骤之一抽出的少部分气体馏分组成的吹扫气体中生产和回收亚硝酸甲酯， 甲基亚硝酸甲酯回收塔中，从而以高效率高度安全地产生和回收回收塔中所含的亚硝酸甲酯。

    Process for producing a diaryl oxalate
    7.
    发明授权
    Process for producing a diaryl oxalate 失效
    制备草酸二芳基酯的方法

    公开(公告)号：US6018072A

    公开(公告)日：2000-01-25

    申请号：US875823

    申请日：1997-08-07

    申请人： Keigo Nishihira ,  Shuji Tanaka ,  Yuki Nishida ,  Satoru Fujitsu

    发明人： Keigo Nishihira ,  Shuji Tanaka ,  Yuki Nishida ,  Satoru Fujitsu

    IPC分类号： C07C67/02 ,  C07C69/34

    CPC分类号： C07C67/02

    摘要： The present invention relates to a process for producing a diaryl oxalate, characterized in that an alkylaryl oxalate is subjected to a disproportionation reaction in the presence of a disproportionation catalyst, thereby to produce a diaryl oxalate while removing a by-product comprising a dialkyl oxalate.The production process of the present invention is advantageous in that the kinds of the by-products are fewer than that in conventional production process for diaryl oxalate, and thus can be practically utilized in industry, and the diaryl oxalates such as diphenyl oxalate, produced by the production process of the present invention are very important industrial materials for producing chemical products such as carbamates.

    摘要翻译： PCT No.PCT / JP96 / 03636 Sec。 371日期1997年8月7日 102（e）日期1997年8月7日PCT 1996年12月12日PCT PCT。 公开号WO97 / 21660 日期：1997年6月19日本发明涉及草酸二芳基酯的制备方法，其特征在于草酸烷基芳基酯在歧化催化剂存在下进行歧化反应，从而产生草酸二芳基酯，同时除去副产物 包括草酸二烷基酯。 本发明的制造方法的优点在于副产物的种类比常规的草酸二芳基酯的制备方法少，因此可以实际应用于工业中，草酸二芳基酯如草酸二苯酯，由 本发明的生产方法是用于生产化学产品如氨基甲酸酯的非常重要的工业材料。

    Process for preparing diaryl carbonate
    8.
    发明授权
    Process for preparing diaryl carbonate 失效
    制备碳酸二芳基酯的方法

    公开(公告)号：US5892089A

    公开(公告)日：1999-04-06

    申请号：US944231

    申请日：1997-10-06

    申请人： Katsumasa Harada ,  Ryoji Sugise ,  Koichi Kashiwagi ,  Yoichi Imbe ,  Takashi Doi ,  Keigo Nishihira ,  Shuji Tanaka ,  Hirofumi Ii

    发明人： Katsumasa Harada ,  Ryoji Sugise ,  Koichi Kashiwagi ,  Yoichi Imbe ,  Takashi Doi ,  Keigo Nishihira ,  Shuji Tanaka ,  Hirofumi Ii

    IPC分类号： C07C68/00

    CPC分类号： C07C68/00

    摘要： A process for preparing a diaryl carbonate from a diaryl oxalate in a liquid phase by decarbonylation is conducted by the steps of:1) performing a decarbonylation reaction of a diaryl oxalate in the presence of an organic phosphorus compound catalyst to give a reaction mixture of a diaryl carbonate and the organic phosphorus compound catalyst;2) recovering the diaryl carbonate from the reaction mixture; and3) performing a decarbonylation reaction of a diaryl oxalate in the presence of the reaction mixture from which the diaryl carbonate has been recovered and to which a halogen atom-containing compound is added, to give a reaction mixture of a diaryl carbonate and the organic phosphorus compound catalyst.

    摘要翻译： 通过脱羰由草酸二芳基酯在液相中制备碳酸二芳基酯的方法是通过以下步骤进行的：1）在有机磷化合物催化剂存在下进行草酸二芳基酯的脱羰基化反应，得到 碳酸二芳酯和有机磷化合物催化剂; 2）从反应混合物中回收碳酸二芳基酯; 和3）在已经回收了碳酸二芳基酯并且含有含卤原子的化合物的反应混合物存在下进行草酸二芳酯的脱羰基反应，得到碳酸二芳基酯和有机物的反应混合物 磷化合物催化剂。

    Method of preparing sodium formyl acetone and 4,4-dimethoxy-2-butanone
    9.
    发明授权
    Method of preparing sodium formyl acetone and 4,4-dimethoxy-2-butanone 失效
    制备甲酰基丙酮和4,4-二甲氧基-2-丁酮的方法

    公开(公告)号：US5276200A

    公开(公告)日：1994-01-04

    申请号：US961402

    申请日：1992-10-15

    申请人： Keigo Nishihira ,  Shuji Tanaka ,  Masahiro Kondo

    发明人： Keigo Nishihira ,  Shuji Tanaka ,  Masahiro Kondo

    IPC分类号： C07C45/68 ,  C07C45/71 ,  C07C45/72 ,  C07C49/175 ,  C07C49/24 ,  C07C45/64

    CPC分类号： C07C49/24 ,  C07C45/68 ,  C07C45/71 ,  C07C45/72 ,  C07C49/175

    摘要： The present invention provides a method of preparing sodium formyl acetone using acetone, methyl formate and sodium methoxide as raw materials. A mixture consisting of an acetone and a methyl formate is supplied to a methanol solution of sodium methoxide, or an acetone and a methyl formate are separately supplied simultaneously to the methanol solution of sodium methoxide. The resultant mixture is sufficiently stirred over a predetermined period of time so as to carry out the reaction to form sodium formyl acetone. Also provided is a method of preparing 4,4-dimethoxy-2-butanone. In this method, the reaction mixture obtained in the reaction to form sodium formyl acetone is directly charged into a reaction vessel simultaneously with sulfuric acid to neutralize and acetalize sodium formyl acetone contained in the reaction mixture so as to obtain 4,4-dimethoxy-2-butanone.

    摘要翻译： 本发明提供使用丙酮，甲酸甲酯和甲醇钠作为原料制备甲酰基丙酮钠的方法。 将由丙酮和甲酸甲酯组成的混合物供应到甲醇钠的甲醇溶液中，或者丙酮和甲酸甲酯分别同时供应到甲醇钠的甲醇溶液中。 将所得混合物在预定的时间内充分搅拌，以进行反应以形成甲酰基丙酮钠。 还提供了制备4,4-二甲氧基-2-丁酮的方法。 在该方法中，将形成甲酰基丙酮的反应中得到的反应混合物与硫酸同时直接加入到反应容器中，中和反应混合物中所含的甲酰基丙酮缩醛，得到4,4-二甲氧基-2 丁酮。

    Process for preparing carbamates
    10.
    发明授权
    Process for preparing carbamates 失效
    制备氨基甲酸酯的方法

    公开(公告)号：US5463109A

    公开(公告)日：1995-10-31

    申请号：US379118

    申请日：1995-01-27

    申请人： Keigo Nishihira ,  Shuji Tanaka

    发明人： Keigo Nishihira ,  Shuji Tanaka

    IPC分类号： C07C269/00 ,  C07C269/04 ,  C07C271/12

    CPC分类号： C07C269/04

    摘要： Disclosed is a process for preparing carbamates comprising reacting carbonic acid diester with ammonia or amines in a liquid phase in the presence of at least 1 mole % of water based on carbonic acid diester.

    摘要翻译： 公开了一种制备氨基甲酸酯的方法，其包括在至少1摩尔％的基于碳酸二酯的水的存在下，使碳酸二酯与氨或胺在液相中反应。