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    1.
    发明专利
    未知

    公开(公告)号：DE69505190T2

    公开(公告)日：1999-03-04

    申请号：DE69505190

    申请日：1995-06-13

    Applicant: DAICEL CHEM

    Inventor： MIURA HIROYUKI ,  SHIMIZU MASAHIKO ,  SATO TAKASHI ,  MORIMOTO YOSHIAKI ,  KAGOTANI MASAHIRO

    IPC: C07C51/12 ,  C07C51/44 ,  C07C53/08

    Abstract: A high purity acetic acid is prepared by reacting methanol with carbon monoxide in the presence of a rhodium catalyst, iodide salts, and methyl iodide, wherein an acetaldehyde concentration in the reaction liquid is maintained at 400 ppm or lower. This may be attained by contacting the liquid containing carbonyl impurities with water to separate and remove the carbonyl impurities. After that, the liquid can be returned to the reactor.

    4.
    发明专利
    未知

    公开(公告)号：FR2548663A1

    公开(公告)日：1985-01-11

    申请号：FR8410837

    申请日：1984-07-06

    Applicant: DAICEL CHEM

    Inventor： KOJIMA HIDETAKA ,  KAGOTANI MASAHIRO

    IPC: C07C53/12 ,  B01J31/00 ,  B01J31/20 ,  B01J31/28 ,  C07B61/00 ,  C07C27/00 ,  C07C51/00 ,  C07C51/56 ,  C07C53/122 ,  C07C67/00 ,  C07C51/54

    Abstract: An O-acetyl compound, such as acetic anhydride, is prepared by carbonylating the corresponding O-methyl compound, such as methyl acetate, by heating the latter at 130 DEG to 250 DEG C. with carbon monoxide of a partial pressure of 1 to 100 kg/cm2 G in the presence of a rhodium catalyst and a iodine compound, whereby the reaction is caused to take place in a reaction solution containing a carboxylic acid in the presence of an aluminum accelerator and a rhodium catalyst treated with hydrogen.

    5.
    发明专利
    未知

    公开(公告)号：DE69505190T3

    公开(公告)日：2007-10-31

    申请号：DE69505190

    申请日：1995-06-13

    Applicant: DAICEL CHEM

    Inventor： MIURA HIROYUKI ,  SHIMIZU MASAHIKO ,  SATO TAKASHI ,  MORIMOTO YOSHIAKI ,  KAGOTANI MASAHIRO

    IPC: C07C51/12 ,  C07C53/08 ,  C07C51/44

    Abstract: A high purity acetic acid is prepared by reacting methanol with carbon monoxide in the presence of a rhodium catalyst, iodide salts, and methyl iodide, wherein an acetaldehyde concentration in the reaction liquid is maintained at 400 ppm or lower. This may be attained by contacting the liquid containing carbonyl impurities with water to separate and remove the carbonyl impurities. After that, the liquid can be returned to the reactor.

    6.
    发明专利
    未知

    公开(公告)号：DE69502336D1

    公开(公告)日：1998-06-10

    申请号：DE69502336

    申请日：1995-05-23

    Applicant: DAICEL CHEM

    Inventor： KAGOTANI MASAHIRO ,  KAJIKAWA YASUTERU

    IPC: B01J31/26 ,  C07B61/00 ,  C07C51/12 ,  C07C53/08 ,  C07C51/44

    Abstract: By employing a process for the preparation of acetic acid which comprises carbonylating methanol with carbon monoxide in first reactor in the presence of a reaction fluid comprising a rhodium catalyst, methyl iodide, an iodide salt, methyl acetate and water, while continuously withdrawing the reaction fluid from the first reactor and introducing it into a flash zone to separate into an evaporated part and an unevaporated part, characterized in that second reactor is provided between the first reactor and the flash zone and methanol is carbonylated with the carbon monoxide contained in the reaction fluid in a state dissolved therein in the second reactor with a residence time of 7 to 60 seconds at 150 to 220 DEG C, the carbon monoxide contained in the reaction fluid withdrawn from the first reactor in a state dissolved therein can be converted into acetic acid in the second reactor through the same carbonylation as that occurring in the first reactor, which enables effective use and high recovery of carbon monoxide.

    9.
    发明专利
    未知

    公开(公告)号：DE69502336T2

    公开(公告)日：1998-09-03

    申请号：DE69502336

    申请日：1995-05-23

    Applicant: DAICEL CHEM

    Inventor： KAGOTANI MASAHIRO ,  KAJIKAWA YASUTERU

    IPC: B01J31/26 ,  C07B61/00 ,  C07C51/12 ,  C07C53/08 ,  C07C51/44

    Abstract: By employing a process for the preparation of acetic acid which comprises carbonylating methanol with carbon monoxide in first reactor in the presence of a reaction fluid comprising a rhodium catalyst, methyl iodide, an iodide salt, methyl acetate and water, while continuously withdrawing the reaction fluid from the first reactor and introducing it into a flash zone to separate into an evaporated part and an unevaporated part, characterized in that second reactor is provided between the first reactor and the flash zone and methanol is carbonylated with the carbon monoxide contained in the reaction fluid in a state dissolved therein in the second reactor with a residence time of 7 to 60 seconds at 150 to 220 DEG C, the carbon monoxide contained in the reaction fluid withdrawn from the first reactor in a state dissolved therein can be converted into acetic acid in the second reactor through the same carbonylation as that occurring in the first reactor, which enables effective use and high recovery of carbon monoxide.

    10.
    发明专利
    未知

    公开(公告)号：BR9502786A

    公开(公告)日：1996-03-12

    申请号：BR9502786

    申请日：1995-06-13

    Applicant: DAICEL CHEM

    Inventor： MIURA HIROYUKI ,  SHIMIZU MASAHIKO ,  SATO TAKASHI ,  MORIMOTO YOSHIAKI ,  KAGOTANI MASAHIRO

    IPC: C07C51/12 ,  C07C51/44 ,  C07C53/08

    Abstract: A high purity acetic acid is prepared by reacting methanol with carbon monoxide in the presence of a rhodium catalyst, iodide salts, and methyl iodide, wherein an acetaldehyde concentration in the reaction liquid is maintained at 400 ppm or lower. This may be attained by contacting the liquid containing carbonyl impurities with water to separate and remove the carbonyl impurities. After that, the liquid can be returned to the reactor.

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