JPH07278043A - Production of acetic acid - Google Patents

Production of acetic acid

Info

Publication number
JPH07278043A
JPH07278043A JP6098105A JP9810594A JPH07278043A JP H07278043 A JPH07278043 A JP H07278043A JP 6098105 A JP6098105 A JP 6098105A JP 9810594 A JP9810594 A JP 9810594A JP H07278043 A JPH07278043 A JP H07278043A
Authority
JP
Japan
Prior art keywords
acetic acid
carbon monoxide
gas
producing acetic
raw material
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
JP6098105A
Other languages
Japanese (ja)
Inventor
Yasushi Kawamura
靖 川村
Katsushi Kosuge
克志 小菅
Toshiya Higuchi
俊也 樋口
Yuzuru Kato
讓 加藤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Steel Corp
Original Assignee
Nippon Steel Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Steel Corp filed Critical Nippon Steel Corp
Priority to JP6098105A priority Critical patent/JPH07278043A/en
Publication of JPH07278043A publication Critical patent/JPH07278043A/en
Withdrawn legal-status Critical Current

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  • Separation Of Gases By Adsorption (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

PURPOSE:To reduce a unit of CO of an acetic acid production process by further effectively using a CO gas which has been conventionally burnt. CONSTITUTION:Impurities contained in a carbon monoxide-containing gas generated in a process 10 for producing acetic acid using carbon monoxide and methanol as raw materials are removed by a pretreatment process. High-purity carbon monoxide is separated and purified by a pressure variation adsorption separation method 12, returned to the process for producing acetic acid and used as part of the raw material.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、一酸化炭素を原料の一
部として使用する酢酸の製造プロセスにおいて、更に発
生するオフガス中の一酸化炭素を有効利用し、原料とな
る一酸化炭素の原単位を低減させる方法に関する。
BACKGROUND OF THE INVENTION The present invention relates to the production of acetic acid using carbon monoxide as a part of a raw material, by effectively utilizing the carbon monoxide in the off-gas that is generated, to produce the raw material of carbon monoxide as a raw material. A method for reducing units.

【0002】[0002]

【従来の技術】酢酸を工業的に生産する方法として、メ
タノールと一酸化炭素を原料とし、触媒を使用して適当
な温度、圧力で以下の主反応を起こさせるモンサント法
やBASF法が知られている(例、文献:C1化学工業
技術集成出版社「サイエンスフォーラム」)。 CH3 OH+CO → CH3 COOH 図5に、従来の酢酸の製造システムを示すが、前記モン
サント法やBASF法を用いて一酸化炭素とメタノール
を反応させる反応系50と、該反応系50によって製造
される粗酢酸を精製する精製系52と、前記反応系50
及び前記精製系52から又は前記精製系52のみから発
生する排ガス中に含まれる低沸点成分を除去するスクラ
バー系51とを有している。
2. Description of the Related Art As a method for industrially producing acetic acid, the Monsanto method and the BASF method are known in which methanol and carbon monoxide are used as raw materials and a catalyst is used to cause the following main reactions at appropriate temperatures and pressures. (Eg, literature: C1 Chemical Industrial Technology Publishing Company "Science Forum"). CH 3 OH + CO → CH 3 COOH FIG. 5 shows a conventional acetic acid production system. A reaction system 50 for reacting carbon monoxide and methanol using the Monsanto method or the BASF method, and a reaction system 50 Purification system 52 for purifying crude acetic acid, and the reaction system 50
And a scrubber system 51 for removing low boiling point components contained in the exhaust gas generated from the purification system 52 or only from the purification system 52.

【0003】[0003]

【発明が解決しようとする課題】しかしながら、前記ス
クラバー系51から排出される排ガスにはCOガスが約
70%(VOL、以下同じ)程度含み、これをフレアー
で他の成分と共に燃焼させていたので、原料である一酸
化炭素の有効活用がなされていないという問題点があっ
た。本発明はかかる事情に鑑みてなされたもので、従来
燃焼処分していたCOガスを更に有効に使用して、酢酸
製造プロセスのCOの原単価を低減することを目的とす
る。
However, the exhaust gas discharged from the scrubber system 51 contains approximately 70% (VOL, the same applies below) of CO gas, which is burned together with other components by flare. However, there has been a problem that carbon monoxide, which is a raw material, has not been effectively utilized. The present invention has been made in view of such circumstances, and it is an object of the present invention to more effectively use CO gas that has been conventionally burned and disposed of to reduce the unit cost of CO in the acetic acid production process.

【0004】[0004]

【課題を解決するための手段】前記目的に沿う請求項1
記載の酢酸の製造方法は、一酸化炭素とメタノールを原
料とする酢酸の製造工程において発生する一酸化炭素含
有オフガスを、前処理工程によって含まれている不純物
を除去した後、圧力変動吸着分離法によって高純度の一
酸化炭素を分離・精製し、前記酢酸の製造工程に戻し原
料の一部として使用している。請求項2記載の酢酸の製
造方法は、一酸化炭素とメタノールを原料とする酢酸の
製造工程において発生する一酸化炭素含有オフガスを、
前処理工程によって含まれている不純物を除去した後、
内部に含まれている液分を完全に除去して、膜分離法に
よって高純度の一酸化炭素を分離・精製し、前記酢酸の
製造工程に戻し原料の一部として使用している。
A method according to the above-mentioned object.
The method for producing acetic acid described is a carbon monoxide-containing off-gas generated in the step of producing acetic acid using carbon monoxide and methanol as raw materials, after removing impurities contained in the pretreatment step, followed by pressure fluctuation adsorption separation method. High-purity carbon monoxide is separated and refined by the above method, and is returned to the above-mentioned acetic acid production step and used as a part of the raw material. The method for producing acetic acid according to claim 2, wherein the carbon monoxide-containing off-gas generated in the step of producing acetic acid using carbon monoxide and methanol as raw materials,
After removing impurities contained in the pretreatment step,
The liquid content contained inside is completely removed, high-purity carbon monoxide is separated and purified by a membrane separation method, and is returned to the above-mentioned acetic acid production step and used as a part of a raw material.

【0005】[0005]

【作用】請求項1、2記載の酢酸の製造方法において
は、酢酸の製造工程から発生する一酸化炭素含有オフガ
スには70%のCOガスを含有するので、これを燃焼さ
せないで、圧力変動吸着分離法又は膜分離法によって、
90〜99.9%程度の高純度のCOガスを分離・精製
し、これを前記酢酸の製造工程にリサイクルし、酢酸製
造の原料として使用している。そして、再度原料として
使用したCOの幾分かは再度排ガスとして酢酸の製造工
程において生ずるが、純度を上げて繰り返しリサイクル
するので、COの使用率が向上し、酢酸製造プロセスに
おけるCO原単位を低減することができる。
In the method for producing acetic acid according to claims 1 and 2, since the carbon monoxide-containing off-gas generated from the acetic acid production step contains 70% CO gas, pressure fluctuation adsorption is performed without burning it. By separation method or membrane separation method,
High-purity CO gas of about 90 to 99.9% is separated and purified, and this is recycled to the acetic acid production process and used as a raw material for acetic acid production. Then, some of the CO used as a raw material again is generated as exhaust gas again in the production process of acetic acid, but since the purity is increased and the product is repeatedly recycled, the usage rate of CO is improved and the CO basic unit in the acetic acid production process is reduced. can do.

【0006】[0006]

【実施例】続いて、添付した図面を参照しつつ、本発明
を具体化した実施例につき説明し、本発明の理解に供す
る。ここに、図1は本発明の一実施例に係る酢酸の製造
方法の工程図、図2はCO−PSAの説明図、図3はC
O吸着塔の説明図、図4は他の実施例に係る酢酸の製造
方法の説明図である。
Embodiments of the present invention will now be described with reference to the accompanying drawings to provide an understanding of the present invention. Here, FIG. 1 is a process diagram of a method for producing acetic acid according to an embodiment of the present invention, FIG. 2 is an explanatory diagram of CO-PSA, and FIG.
FIG. 4 is an explanatory diagram of an O adsorption tower, and FIG. 4 is an explanatory diagram of a method for producing acetic acid according to another embodiment.

【0007】図1に示すように、本発明の一実施例に係
る酢酸の製造方法を適用した設備は、一酸化炭素とメタ
ノールの反応系10と、該反応系10と精製系13から
の排ガスを処理するスクラバー系11と、スクラバー系
11からの含一酸化炭素排ガスを処理するCO−PSA
系12と、前記反応系10によって製造された粗酢酸を
精製する精製系13とを有している。
As shown in FIG. 1, the equipment to which the method for producing acetic acid according to the embodiment of the present invention is applied is a reaction system 10 of carbon monoxide and methanol, and exhaust gas from the reaction system 10 and the purification system 13. For treating carbon dioxide and CO-PSA for treating carbon monoxide-containing exhaust gas from the scrubber system 11
It has a system 12 and a purification system 13 for purifying the crude acetic acid produced by the reaction system 10.

【0008】前記反応系10には前述のモンサント法又
はBASF法が用いられている。また、これに連携する
スクラバー系11では、反応系10から排出される排ガ
スを水又はアルコールで洗浄して含有する低沸点化合物
を除去している。そして、前記反応系10に連携する精
製系13では、反応系10によって製造された粗酢酸中
の不純物を除去して純度の高い製品酢酸を製造してい
る。これらは、前記従来技術と同様であるので詳しい説
明を省略する。
The above-mentioned Monsanto method or BASF method is used for the reaction system 10. In addition, in the scrubber system 11 that cooperates with this, the exhaust gas discharged from the reaction system 10 is washed with water or alcohol to remove the low-boiling compounds contained therein. Then, the purification system 13 linked to the reaction system 10 removes impurities in the crude acetic acid produced by the reaction system 10 to produce a highly pure product acetic acid. Since these are similar to the above-mentioned conventional technique, detailed description thereof will be omitted.

【0009】前記スクラバー系11から排出されたガス
には、約70%のCOガスを含むので、CO−PSA系
12でCOガスの純度を上げる。ここで、CO−PSA
系とは一酸化炭素の純度を向上するための圧力変動吸着
分離系をいい、その装置14の概要は図2に示す。
Since the gas discharged from the scrubber system 11 contains about 70% of CO gas, the CO-PSA system 12 increases the purity of CO gas. Where CO-PSA
The system means a pressure fluctuation adsorption separation system for improving the purity of carbon monoxide, and an outline of the device 14 is shown in FIG.

【0010】前記装置14は、スクラバー系11からの
オフガスを圧縮するコンプレッサー15と、圧縮された
オフガスをアルコール又は水を供給して含有する酢酸及
びヨウ化メチルを約1ppm以下に除去する吸収塔16
と、含有するCOを吸着回収するCO吸着塔17と、該
CO吸着塔17に付随する真空ポンプ18と、該真空ポ
ンプ18によって回収されたCOガスを貯蔵する製品C
Oホルダー19と、該製品COホルダー19内のCOガ
スを昇圧するコンプレッサー20と、該コンプレッサー
20によって圧縮されたガスから水分を除く除湿機21
とを有し、前記スクラバー系11から放出されるオフガ
スから90〜99.9%の純度のCOガスを回収してい
る。
The apparatus 14 includes a compressor 15 for compressing off-gas from the scrubber system 11, and an absorption tower 16 for removing acetic acid and methyl iodide contained in the compressed off-gas by supplying alcohol or water to about 1 ppm or less.
A CO adsorption tower 17 for adsorbing and recovering the contained CO, a vacuum pump 18 attached to the CO adsorption tower 17, and a product C for storing the CO gas recovered by the vacuum pump 18.
O holder 19, a compressor 20 for boosting the CO gas in the product CO holder 19, and a dehumidifier 21 for removing water from the gas compressed by the compressor 20.
And CO gas having a purity of 90 to 99.9% is recovered from the off gas emitted from the scrubber system 11.

【0011】前記CO吸着塔17の2塔式の具体例を図
3に示すが、内部にCOガスの吸着剤を配置されたA塔
及びB塔からなる吸着塔を備え、脱着工程において真空
ポンプ18により真空状態となった吸着塔に原料ガスを
入れて吸着塔内の圧力を上昇する昇圧工程と、一定圧
(例えば、1.0kg/cm2 )で原料ガスを吸着塔に
入れて前記吸着剤にCOガスを吸着させる吸着工程と、
吸着塔内のガスを常圧まで下げる放圧工程と、接続され
る真空ポンプ18を駆動させて吸着塔内を減圧し、前記
吸着剤に吸着されたCOを回収する脱着工程とを交互に
繰り返しCOガスを回収するようになっている。なお、
この実施例は2塔の吸着塔で構成したが、3塔以上の吸
着塔を用いてCOガスの純度を上昇することも当然可能
である。
A concrete example of the two-column type CO adsorption column 17 is shown in FIG. 3. It is equipped with an adsorption column consisting of A column and B column in which a CO gas adsorbent is arranged, and a vacuum pump is used in the desorption process. The step of increasing the pressure in the adsorption tower by introducing the raw material gas into the adsorption tower that has been brought to a vacuum state by 18, and the raw material gas is put into the adsorption tower at a constant pressure (for example, 1.0 kg / cm 2 ) and the adsorption is performed. An adsorption step for adsorbing CO gas on the agent,
The pressure release step of reducing the gas in the adsorption tower to normal pressure and the desorption step of driving the connected vacuum pump 18 to reduce the pressure in the adsorption tower and recovering the CO adsorbed by the adsorbent are alternately repeated. It is designed to recover CO gas. In addition,
Although this embodiment is composed of two adsorption columns, it is naturally possible to increase the purity of CO gas by using three or more adsorption columns.

【0012】前記実施例においては、圧力変動吸着分離
法を用いてCOガスの純度を向上させた場合について説
明したが、膜分離法によってCOガスの純度を向上させ
ることも可能である。図4には膜分離法の概略を示す
が、圧力変動吸着分離法と同様にコンプレッサー15に
よってスクラバー系11から排出されたガスを圧縮し、
吸着塔16によって含まれる酢酸、ヨウ化メチルを除去
し、ミストエリミネーター23によってガス中に含まれ
るミストを除去し、更にプレヒーター24によって昇温
してガス中に含まれる液分を完全に気化し、膜を通過し
ないCOガスを回収し、これによって純度を上げて、再
度酢酸製造の原料としてリサイクルするようにしてい
る。
In the above-mentioned embodiment, the case where the purity of CO gas is improved by using the pressure fluctuation adsorption separation method has been described, but it is also possible to improve the purity of CO gas by the membrane separation method. FIG. 4 shows an outline of the membrane separation method. As with the pressure fluctuation adsorption separation method, the compressor 15 compresses the gas discharged from the scrubber system 11,
Acetic acid and methyl iodide contained in the adsorption tower 16 are removed, mist contained in the gas is removed by the mist eliminator 23, and the temperature is raised by the pre-heater 24 to completely vaporize the liquid contained in the gas. The CO gas that does not pass through the membrane is recovered, the purity is increased by this, and the CO gas is recycled again as a raw material for acetic acid production.

【0013】前記実施例に係る酢酸の製造方法によっ
て、CO基準の酢酸回収率を90%とした場合、従来2
5T/Hの酢酸を製造する場合の一酸化炭素の必要量が
10350Nm3 /Hであったが、9425Nm3 /H
となって、従来法の約9%の一酸化炭素原料の削減が可
能となった。
When the acetic acid recovery rate based on CO is set to 90% by the method for producing acetic acid according to the above-mentioned embodiment, it is 2
The required amount of carbon monoxide for producing 5 T / H acetic acid was 10350 Nm 3 / H, but 9425 Nm 3 / H
As a result, it is possible to reduce the carbon monoxide raw material by about 9% compared to the conventional method.

【0014】[0014]

【発明の効果】請求項1、2記載の酢酸の製造方法は以
上の説明からも明らかなように、CO原単位の低減によ
り、製品酢酸のコストダウンを図ることができる。ま
た、同一量の酢酸を生産してもCOガスの原料が少なく
て済むので、COガス発生設備の運転ロードダウンを行
うことができる。
As is apparent from the above description, the method for producing acetic acid according to claims 1 and 2 can reduce the cost of acetic acid product by reducing the CO basic unit. Further, even if the same amount of acetic acid is produced, the raw material of CO gas can be reduced, so that the operation load of the CO gas generation facility can be reduced.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の一実施例に係る酢酸の製造方法の工程
図である。
FIG. 1 is a process diagram of a method for producing acetic acid according to an embodiment of the present invention.

【図2】CO−PSAの説明図である。FIG. 2 is an explanatory diagram of CO-PSA.

【図3】CO吸着塔の説明図である。FIG. 3 is an explanatory diagram of a CO adsorption tower.

【図4】他の実施例に係る酢酸の製造方法の説明図であ
る。
FIG. 4 is an explanatory diagram of a method for producing acetic acid according to another example.

【図5】従来例の酢酸の製造方法の工程図であるFIG. 5 is a process diagram of a conventional method for producing acetic acid.

【符号の説明】[Explanation of symbols]

10 反応系 11 スクラバー系 12 CO−PSA系 13 精製系 14 装置 15 コンプレッサー 16 吸着塔 17 CO吸着塔 18 真空ポンプ 19 製品COホルダー 20 コンプレッサー 21 除湿機 23 ミストエリミネーター 24 プレヒーター 10 Reaction system 11 Scrubber system 12 CO-PSA system 13 Purification system 14 Device 15 Compressor 16 Adsorption tower 17 CO adsorption tower 18 Vacuum pump 19 Product CO holder 20 Compressor 21 Dehumidifier 23 Mist eliminator 24 Preheater

───────────────────────────────────────────────────── フロントページの続き (72)発明者 加藤 讓 福岡県北九州市戸畑区大字中原46−59 新 日本製鐵株式会社機械・プラント事業部内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Satoshi Kato 46-59 Nakahara, Tobata-ku, Kitakyushu, Fukuoka Prefecture 46-59 Nippon Steel Corporation Machinery & Plant Division

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 一酸化炭素とメタノールを原料とする酢
酸の製造工程において発生する一酸化炭素含有オフガス
を、前処理工程によって含まれている不純物を除去した
後、圧力変動吸着分離法によって高純度の一酸化炭素を
分離・精製し、前記酢酸の製造工程に戻し原料の一部と
して使用することを特徴とする酢酸の製造方法。
1. A carbon monoxide-containing off-gas generated in a process for producing acetic acid using carbon monoxide and methanol as raw materials is subjected to a pretreatment process to remove impurities contained in the off-gas, followed by a high-purity adsorption separation method. A method for producing acetic acid, which comprises separating and purifying carbon monoxide of Example 1, and returning the carbon monoxide to the step of producing acetic acid as a raw material.
【請求項2】 一酸化炭素とメタノールを原料とする酢
酸の製造工程において発生する一酸化炭素含有オフガス
を、前処理工程によって含まれている不純物を除去した
後、内部に含まれている液分を完全に除去して、膜分離
法によって高純度の一酸化炭素を分離・精製し、前記酢
酸の製造工程に戻し原料の一部として使用することを特
徴とする酢酸の製造方法。
2. The carbon monoxide-containing off-gas generated in the process for producing acetic acid using carbon monoxide and methanol as raw materials, after removing impurities contained in the pre-treatment process, the liquid content contained therein. Is completely removed, high-purity carbon monoxide is separated and purified by a membrane separation method, and the carbon monoxide is returned to the acetic acid production step and used as a part of a raw material.
JP6098105A 1994-04-11 1994-04-11 Production of acetic acid Withdrawn JPH07278043A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6098105A JPH07278043A (en) 1994-04-11 1994-04-11 Production of acetic acid

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6098105A JPH07278043A (en) 1994-04-11 1994-04-11 Production of acetic acid

Publications (1)

Publication Number Publication Date
JPH07278043A true JPH07278043A (en) 1995-10-24

Family

ID=14211054

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6098105A Withdrawn JPH07278043A (en) 1994-04-11 1994-04-11 Production of acetic acid

Country Status (1)

Country Link
JP (1) JPH07278043A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014024616A1 (en) * 2012-08-09 2014-02-13 Jx日鉱日石エネルギー株式会社 Method for manufacturing olefin derivative

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014024616A1 (en) * 2012-08-09 2014-02-13 Jx日鉱日石エネルギー株式会社 Method for manufacturing olefin derivative
JP2014034554A (en) * 2012-08-09 2014-02-24 Jx Nippon Oil & Energy Corp Method for manufacturing olefin derivative

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