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公开(公告)号：JPH0940590A
公开(公告)日：1997-02-10
申请号：JP19829095
申请日：1995-08-03
Applicant: DAICEL CHEM
Inventor： MORIMOTO YOSHIAKI , NAKAYAMA HIROYUKI
Abstract: PROBLEM TO BE SOLVED: To provide a method for easily and sufficiently removing acetaldehyde and efficiently separating methyliodide and water from a mixed solution consisting of acetaldehyde, methyliodide and water. SOLUTION: This method for effectively separating and removing acetaldehyde is to distill a mixed solution containing =40 stages at >=10 refluxing ratio.
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Patent Agency Ranking
公开(公告)号：JP2552168B2
公开(公告)日：1996-11-06
申请号：JP7990288
申请日：1988-03-31
Applicant: DAICEL CHEM
Inventor： MATSUOKA KAZUYUKI , MORIMOTO YOSHIAKI
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公开(公告)号：JPH07324055A
公开(公告)日：1995-12-12
申请号：JP6798995
申请日：1995-03-27
Applicant: DAICEL CHEM
Inventor： HARANO YOSHIYUKI , MORIMOTO YOSHIAKI
Abstract: PURPOSE:To efficiently obtain the compounds with a series of production equipment by efficiently recovering low-boiling components and entrainment catalyst while reducing the energy cost through a specific process. CONSTITUTION:Firstly, in a reaction zone, both methanol and methyl acetate are reacted with CO in the presence of a catalyst, and the resultant carbonylated mixture is depressurized in a gas-liquid separation zone and the volatile components evaporated and the catalyst solution are fed to 1st distillation zone and the reaction zone, respectively. Second, the low-boiling components from the column top in the 1st distillation zone, the catalyst-contg. high-boiling components from the column bottom, and the medium-boiling components obtained by side cut and consisting mainly of acetic anhydride and acetic acid, are fed to the reaction zone, the reaction zone, etc., and 2nd distillation zone, respectively. Subsequently, the residual low-boiling components from the column top in the 2nd distillation zone, and the components obtained from the side cut or column bottom and consisting mainly of acetic anhydride and acetic acid, are fed to the reaction zone and 3rd distillation zone, respectively. Finally, in the 3rd distillation zone, the objective acetic acid and acetic anhydride are obtained from the column top and from the side cut or column bottom, respectively.
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公开(公告)号：JPH0296548A
公开(公告)日：1990-04-09
申请号：JP13193788
申请日：1988-05-30
Applicant: DAICEL CHEM
Inventor： MATSUOKA KAZUYUKI , MORIMOTO YOSHIAKI
IPC: C07C67/055 , B01J31/28 , C07B61/00 , C07C67/035 , C07C69/155
Abstract: PURPOSE:To industrially and advantageously obtain the objective compound by separating a reaction product gas into plural components and subjecting the components to efficient circulation treatment in respective steps in reacting propylene with oxygen and acetic acid in the vapor phase in the presence of a specific catalyst and producing allyl acetate. CONSTITUTION:Propylene is reacted with oxygen and acetic acid (Y) in the vapor phase in the presence of a Pd catalyst prepared by supporting Pd and an alkaline metal acetate on silica in a reactor 1 and the resultant product gas (D) is cooled and separated into an uncondensed component (E) and condensed component (X). The obtained component (X) is subsequently heated, deaerated in a deaerator 4 and then successively passed through the first, second, third, fourth and fifth distillation columns 5, 7, 8, 10 and 11 to separate and purify allyl acetate. In the process, most (B) of the bottom product in the column 5 is returned to the reactor 1 and acrolein is absorbed and removed from the rest (H) thereof, the uncondensed component (E) and a gas (G) generated in the deaerator 4 in an acrolein absorber 3. The other part (C) is then returned to the reactor 1 and a solution (F) absorbing the acrolein is mixed with the component (X). Furthermore, byproducts in a descending liquid (K) are cut in a sidestream from a recovering section of the column 5 and hydrolyzed in a hydrolytic reactor 6. The upper layer (Q) of an overhead distillate (D) in the column 8 is returned to the column 8 to advantageously afford the allyl acetate.
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公开(公告)号：JPH07291892A
公开(公告)日：1995-11-07
申请号：JP8985094
申请日：1994-04-27
Applicant: DAICEL CHEM
Inventor： KOJIMA HIDETAKA , MORIMOTO YOSHIAKI
Abstract: PURPOSE:To obtain high-purity acetic acid useful as a chemical raw material efficiently and in high yield by reacting mixed raw materials of methyl formate and methanol in the presence of a rhodium catalyst and methyl iodide under pressure of carbon monoxide. CONSTITUTION:Mixed raw materials comprising methyl formate and methanol are reacted in the presence of a rhodium catalyst (concentration in a reaction solution is preferably 200-2,000ppm) of the formula RhX3 (X is Cl, Br or I) and methyl iodide under pressure of carbon monoxide to give the objective acetic acid. The amount of iodine ion in the reaction solution is preferably 3-30wt.%, preferably
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公开(公告)号：JPH0725814A
公开(公告)日：1995-01-27
申请号：JP16920593
申请日：1993-07-08
Applicant: DAICEL CHEM
Inventor： UENO TAKASHI , TSUJI YASUO , MORIMOTO YOSHIAKI
Abstract: PURPOSE:To provide a method for producing highly pure acetic acid having a sufficient quality, namely an excellent permanganate time, by a purification method comprising only a conventional purification process without requiring a purification treatment process such as an ozone treatment. CONSTITUTION:A method for producing acetic acid by continuously reacting methanol and/or a methyl acetate aqueous solution with carbon monoxide in the presence of a rhodium complex as a catalyst and methyl iodide as a cocatalyst is characterized in that acetaldehyde is separated from a process liquid circulated in a reactor to maintain the concentration of the acetaldehyde to
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