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公开(公告)号：US20180273459A1
公开(公告)日：2018-09-27
申请号：US15542621
申请日：2017-05-25
申请人： DAICEL CORPORATION
发明人： Masahiko SHIMIZU
摘要： It is intended to provide a method capable of industrially and efficiently producing acetic acid having a good potassium permanganate test value without a large cost.The method includes a step of distilling an aqueous phase and/or an organic phase of a column top condensate of a lower boiling point component removal column by a crotonaldehyde removal column; and the reflux ratio of the lower boiling point component removal column is not less than 2 (when the aqueous phase is refluxed), and the crotonaldehyde removal column is operated such that at least one of the following conditions (i) to (iii) is satisfied: (i) the reflux ratio of the distillation column is not less than 0.01; (ii) the ratio of the crotonaldehyde concentration (ppm by mass) in a distillate liquid of the distillation column to the crotonaldehyde concentration (ppm by mass) in a charging mixture (former/latter) is less than 1; and (iii) the ratio of the crotonaldehyde concentration (ppm by mass) in a bottom fraction of the distillation column to the crotonaldehyde concentration (ppm by mass) in a charging mixture (former/latter) is more than 1.
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公开(公告)号：US20180258022A1
公开(公告)日：2018-09-13
申请号：US15542833
申请日：2017-05-25
申请人： DAICEL CORPORATION
发明人： Masahiko SHIMIZU
摘要： Provided is a method for producing acetic acid that is capable of greatly improving the life of a silver-substituted ion exchange resin (IER) for removing organic iodine compounds in acetic acid.With the method for producing acetic acid according to the present invention, in a carbonylation process of a methanol method, a nickel base alloy or zirconium is used as a material of a distillation column in a dehydration step, and as metal ion concentrations in a charging mixture of the distillation column in the dehydration step, an iron ion concentration is less than 10,000 ppb by mass, a chromium ion concentration is less than 5,000 ppb by mass, a nickel ion concentration is less than 3,000 ppb by mass, and a molybdenum ion concentration is less than 2,000 ppb by mass.
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公开(公告)号：US20180201563A1
公开(公告)日：2018-07-19
申请号：US15540189
申请日：2017-05-25
申请人： DAICEL CORPORATION
发明人： Masahiko SHIMIZU
CPC分类号： C07C51/12 , B01D3/009 , B01D3/143 , B01D15/361 , C07C51/44 , C07C51/445 , C07C53/08
摘要： It is intended to provide a method capable of lowering a formic acid concentration in product acetic acid by a simple approach. The method for producing acetic acid according to the present invention comprises at least one step selected from a step that satisfies the following operating conditions (i) and a step that satisfies the following operating conditions (ii) in an acetic acid production process: (i) operating conditions involving a hydrogen partial pressure of less than 500 kPa (absolute pressure), a carbon dioxide partial pressure of less than 70 kPa (absolute pressure), and an operating temperature of more than 175° C.; and (ii) operating conditions involving a hydrogen partial pressure of not more than 5 kPa (absolute pressure), a carbon dioxide partial pressure of less than 20 kPa (absolute pressure), and an operating temperature of more than 100° C.
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公开(公告)号：US20180009732A1
公开(公告)日：2018-01-11
申请号：US15507137
申请日：2017-01-16
申请人： Daicel Corporation
CPC分类号： B01D3/40 , B01D3/148 , B01D3/36 , B01D3/4255 , B01D3/4261 , C07C51/12 , C07C51/44 , C07C53/08
摘要： A process for separating or removing permanganate reducing compounds (PRC's) from a first mixture containing at least one PRC, methyl iodide, and water comprises the steps of: feeding the first mixture to a feed port of a distillation column, and distilling and separating the first mixture into an upper stream and a lower stream, wherein the distillation of the first mixture forms a second mixture at an upper position than the feed port, and the process further comprises the steps of: withdrawing the second mixture as the upper stream, and withdrawing the lower stream from a lower position than the feed port.
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公开(公告)号：US20170349521A1
公开(公告)日：2017-12-07
申请号：US15534349
申请日：2016-09-20
申请人： DAICEL CORPORATION
IPC分类号： C07C51/12 , C07C51/44 , C07B61/00 , B01D3/00 , C07C53/08 , B01D3/42 , B01D3/34 , C01B3/16 , B01J23/46
CPC分类号： C07C51/12 , B01D3/009 , B01D3/343 , B01D3/4294 , B01J23/464 , B01J23/468 , C01B3/16 , C07B61/00 , C07C51/44 , C07C53/08
摘要： A method produces acetic acid and includes a reaction step, a first purification step, a second purification step, and a third purification step. In the reaction step, a material mixture including methanol, carbon monoxide, a catalyst, and an iodide is subjected to a methanol carbonylation reaction in a reactor (1) to form acetic acid. In the first purification step, a crude acetic acid stream including acetic acid formed in the reaction step is subjected to distillation in a distillation column (3) to give a first acetic acid stream enriched with acetic acid. In the second purification step, the first acetic acid stream is subjected to distillation in a distillation column (5) to give a second acetic acid stream further enriched with acetic acid. In the third purification step, an acetic acid stream is subjected to purification in an additional purification unit (e.g., a distillation column (6)) while controlling the corrosive iodine concentration in the acetic acid stream passing through the unit to 100 ppm or less, to give a third acetic acid stream still further enriched with acetic acid. The method for producing acetic acid is suitable for restraining corrosion of the acetic acid production equipment.
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