Title:
カルボニル化処理の流れからの過マンガン酸塩還元化合物及びアルキルヨウ化物の除去
Document Type and Number:
Japanese Patent JP4681088
Kind Code:
B2
Abstract:
Disclosed is a method to manufacture high purity acetic acid. Although described in relation to that produced by a low water carbonylation process the present invention is applicable to other mechanisms for production of acetic acid which results in formation of permanganate reducing compounds such as acetaldehyde, propionic acid, and alkyl iodide impurities in intermediate process streams. It has been found that permanganate reducing compounds and alkyl iodides may be conveniently removed from a light phase of an intermediate stream in the reaction process by employing a multiple distillation process coupled with an optional extraction of acetaldehyde. The distillation process involves first distilling a light phase to concentrate the permanganate reducing compounds, and in particular the acetaldehyde, and then separating the permanganate reducing compounds and alkyl iodides in a second distillation tower. The second distillation serves to remove the permanganate reducing compounds and alkyl iodides from methyl iodide, methyl acetate, and methanol mixture. As an optional third step, the twice distilled stream may be directed to an extractor to remove any remaining quantities of methyl iodide from the aqueous acetaldehyde stream to obtain acetic acid as a final product in greater than 99% purity. It has been found that this process removes at least 50% of the permanganate reducing compounds and alkyl iodides and at least 20% of the propionic acid impurity from the intermediate light phase stream, and results in lower alkyl iodide concentration in the carbonylation reaction process, and in particular in the carbonylation reactor. It has also been found that during shut down of the inventive process, polymers of acetaldehyde tend to form in the base of the second distillation tower. To avoid or minimize the formation of these polymers, a constant flow of solvent is passed through the base of the column.
Inventors:
Meydin, Shin
Bray, George A
Carnilow, Michael El
Maychen, Melchior Ar
Wayne David, Picard
Santillan, Valerie
Skates, Mark O
Tanke, Robin Suzanne
Torrance, G. Paul
Vogel, Richard F, Junior
Warner, Earl Jay
Bray, George A
Carnilow, Michael El
Maychen, Melchior Ar
Wayne David, Picard
Santillan, Valerie
Skates, Mark O
Tanke, Robin Suzanne
Torrance, G. Paul
Vogel, Richard F, Junior
Warner, Earl Jay
Application Number:
JP51949498A
Publication Date:
May 11, 2011
Filing Date:
October 17, 1997
Export Citation:
Assignee:
Celanese International Corporation
International Classes:
B01J27/32; B01J38/00; C07C51/44; C07C51/00; C07C51/12; C07C51/48; C07C53/08; C08G2/12; C08G2/28
Domestic Patent References:
| JP940590A | ||||
| JP812612A |
Attorney, Agent or Firm:
Kazuo Shamoto
Shinjiro Ono
Yasushi Kobayashi
Akio Chiba
Hiroyuki Tomita
Okimoto Kazuaki
Hiroshi Okawa
Shinjiro Ono
Yasushi Kobayashi
Akio Chiba
Hiroyuki Tomita
Okimoto Kazuaki
Hiroshi Okawa