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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methyl nitrite to produce dimethyl carbonate; a second step of absorbing dimethyl carbonate contained in a gas fraction withdrawn from the first step by dimethyl oxalate; a third step of regenerating methyl nitrite by contacting nitrogen monoxide contained in a gas fraction withdrawn from the second step with a molecular oxygen-containing gas and methyl alcohol; a fourth step of collecting dimethyl carbonate by distilling a liquid fraction withdrawn from the second step; and a fifth step of recovering methyl nitrite from a purge gas consisting of a portion of a regenerated gas fraction withdrawn from the third step by absorbing methyl nitrite in the purge gas by methyl alcohol to provide a methyl nitrite-containing liquid fraction and a nitrogen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 continuously producing dimethyl carbonate
    2.
    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 alkyl nitrite
    4.
    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
    5.
    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 preparing carbamates
    7.
    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。

    Continuous process for preparing dimethyl carbonate
    9.
    发明授权
    Continuous process for preparing dimethyl carbonate 失效
    制备二甲基碳酸酯的连续方法

    公开(公告)号：US5214185A

    公开(公告)日：1993-05-25

    申请号：US914355

    申请日：1992-07-17

    申请人： Keigo Nishihira ,  Shin-ichi Yoshida ,  Shuji Tanaka

    发明人： Keigo Nishihira ,  Shin-ichi Yoshida ,  Shuji Tanaka

    IPC分类号： C07C68/00

    CPC分类号： C07C68/00

    摘要： Disclosed is a continuous process for preparing dimethyl carbonate which comprises:a first step of introducing a gas containing carbon monoxide and methyl nitrite into a reactor filled with a solid catalyst to obtain a reaction product containing dimethyl carbonate;a second step of separating the reaction product to a non-condensed gas and a solution containing dimethyl carbonate by adding dimethyl oxalate;a third step of introducing the non-condensed gas into a regenerating column to contact it with a molecular state oxygen-containing gas and methanol whereby regenerating nitrogen monoxide to methyl nitrite, so as to contain 2 to 7% by volume of nitrogen monoxide in a non-absorbed gas at an outlet of the column, which in turn is introduced in the reactor of the first step;a fourth step of extracting, distilling and separating dimethyl carbonate from the solution by further adding dimethyl oxalate to remove methanol; anda fifth step of distilling and separating dimethyl carbonate from a mixed solution to remove dimethyl oxalate and recycling the removed dimethyl oxalate to the fourth step.