JP2012020221A - Carbon dioxide absorption method - Google Patents
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Abstract
Description
本発明は、炭酸ガスの吸収（固定）方法に関する。 The present invention relates to a method for absorbing (fixing) carbon dioxide.
炭酸ガスは、生物の呼吸、燃焼反応、化学工場等から多量に生成し、現在、炭酸ガスに起因する地球の温室効果が問題視されている。炭酸ガスは、地球環境へ及ぼす影響の他に宇宙船、潜水艦、深海艇等の密閉環境においても問題となる。そのため、種々の炭酸ガス吸着剤が提案されている。例えば、炭酸ガスを物理吸着する吸着剤としてＮａ−Ｘゼオライトなどのゼオライト系吸着剤が提案されている。 Carbon dioxide is produced in large quantities from living organisms' respiration, combustion reactions, chemical factories, etc., and the global greenhouse effect caused by carbon dioxide is currently regarded as a problem. Carbon dioxide is a problem in sealed environments such as spacecraft, submarines, and deep sea boats in addition to the effects on the global environment. For this reason, various carbon dioxide adsorbents have been proposed. For example, zeolite-based adsorbents such as Na-X zeolite have been proposed as adsorbents that physically adsorb carbon dioxide.
しかしながら、ゼオライト系吸着剤は、水分に対する吸着能が著しく大きいため、水分が共存する場合には、水分の吸着により炭酸ガスに対する吸着が著しく損なわれる。 However, the zeolite-based adsorbent has a remarkably large water-absorbing ability, so that when water is present, the adsorption of carbon dioxide gas is remarkably impaired by the water adsorption.
また、炭酸ガスを固定化する吸着剤として、活性炭、活性炭素繊維等にアミンを添着させた吸着剤が提案されている。例えば、特許文献１には、多孔質担体上に、Ｎ−メチルアラニン酸のアルカリ金属塩を担持させた炭酸ガス吸着剤が提案されている。アミン添着活性炭では、添着アミン量により炭酸ガス除去量が左右される上、アミンの添着量が小さいため、炭酸ガス吸着量が少ない。 Further, as an adsorbent for fixing carbon dioxide gas, an adsorbent obtained by adding an amine to activated carbon, activated carbon fiber or the like has been proposed. For example, Patent Document 1 proposes a carbon dioxide gas adsorbent in which an alkali metal salt of N-methylalanic acid is supported on a porous carrier. In the amine-impregnated activated carbon, the amount of carbon dioxide removed depends on the amount of amine added, and the amount of carbon dioxide adsorbed is small because the amount of amine attached is small.
更に、炭酸ガスを含むガスとの気液接触により、炭酸ガスと化学反応させて炭酸ガスを吸収する液状アミン吸収剤も知られている。 Further, liquid amine absorbents that absorb carbon dioxide gas through chemical reaction with carbon dioxide gas by gas-liquid contact with a gas containing carbon dioxide gas are also known.
しかしながら、液状アミン吸収剤を用いる場合には、設備が大型化するとともに装置の操作及び保守が煩雑化する。 However, when a liquid amine absorbent is used, the equipment becomes large and the operation and maintenance of the apparatus become complicated.
本発明は、炭酸ガスの吸収効率が向上した新規な炭酸ガスの吸収方法を提供することを主な目的とする。 The main object of the present invention is to provide a novel carbon dioxide gas absorption method with improved carbon dioxide gas absorption efficiency.
本発明者は上記目的を達成すべく鋭意研究を重ねた結果、特定の構造を有する化合物を溶解した非プロトン性極性溶媒を炭酸ガス吸収剤として用いる場合には、上記目的を達成できることを見出し、本発明を完成するに至った。 As a result of intensive studies to achieve the above object, the present inventor has found that the above object can be achieved when an aprotic polar solvent in which a compound having a specific structure is dissolved is used as a carbon dioxide gas absorbent. The present invention has been completed.
即ち、本発明は下記の炭酸ガスの吸収方法に関する。
１．ヒドロキシ−ケトン構造を有する化合物を溶解した非プロトン性極性溶媒に炭酸ガスを接触させることを特徴とする炭酸ガスの吸収方法。
２．前記非プロトン性極性溶媒中の前記ヒドロキシ−ケトン構造を有する化合物の含有量は、４５重量％以上である、上記項１に記載の吸収方法。
３．前記非プロトン性極性溶媒は、白金、酸化亜鉛及びゼオライトからなる群から選択される少なくとも１種の触媒を含有する、上記項１又は２に記載の吸収方法。
４．前記非プロトン性極性溶媒の温度が２０〜１５０℃である、上記項１〜３のいずれかに記載の吸収方法。
５．前記ヒドロキシ−ケトン構造を有する化合物は、下記（Ａ）〜（Ｆ）：
（Ａ）ケトース化合物、
（Ｂ）下記式（１）で示される化合物、
That is, the present invention relates to the following carbon dioxide absorption method.
1. A carbon dioxide absorption method comprising contacting carbon dioxide with an aprotic polar solvent in which a compound having a hydroxy-ketone structure is dissolved.
2. Item 2. The absorption method according to Item 1, wherein the content of the compound having a hydroxy-ketone structure in the aprotic polar solvent is 45% by weight or more.
3. Item 3. The absorption method according to Item 1 or 2, wherein the aprotic polar solvent contains at least one catalyst selected from the group consisting of platinum, zinc oxide, and zeolite.
4). Item 4. The absorption method according to any one of Items 1 to 3, wherein the temperature of the aprotic polar solvent is 20 to 150 ° C.
5. The compounds having the hydroxy-ketone structure are the following (A) to (F):
(A) a ketose compound,
(B) a compound represented by the following formula (1),
〔式（１）中、Ｒ１及びＲ２は同一又は異なって置換基を有していてもよい炭素数１〜５の炭化水素基を示す。Ｒ３は水素又は置換基を有していてもよい炭素数１〜５の炭化水素基を示す。Ｒ２及びＲ３は閉環して置換基を有していてもよい環状構造を形成してもよい。〕
（Ｃ）下記式（２）で示される化合物、
[In Formula (1), R < 1 > and R < 2 > are the same or different, and show the C1-C5 hydrocarbon group which may have a substituent. R 3 represents hydrogen or a hydrocarbon group having 1 to 5 carbon atoms which may have a substituent. R 2 and R 3 may be closed to form a cyclic structure which may have a substituent. ]
(C) a compound represented by the following formula (2),
〔式（２）中、Ｒ１は水素、水酸基又は置換基を有していてもよい炭素数１〜５の炭化水素基を示す。ｎは１以上の正数を示す。環状構造は置換基を有していてもよい。〕
（Ｄ）下記式（３）で示される化合物、
[In the formula (2), R 1 represents hydrogen, a hydroxyl group or a hydrocarbon group having 1 to 5 carbon atoms which may have a substituent. n represents a positive number of 1 or more. The cyclic structure may have a substituent. ]
(D) a compound represented by the following formula (3),
〔式（３）中、Ｒｉｎｇ１及びＲｉｎｇ２は同一又は異なって置換基を有していてもよい芳香環を示す。〕
（Ｅ）下記式（４）で示される化合物、並びに、
[In Formula (3), Ring 1 and Ring 2 are the same or different and each represents an aromatic ring which may have a substituent. ]
(E) a compound represented by the following formula (4), and
〔式（４）中、Ｒｉｎｇ１は置換基を有していてもよい芳香環を示す。Ｒ１は置換基を有していてもよい炭素数１〜５の炭化水素基を示す。Ｒ２は水素又は置換基を有していてもよい炭素数１〜５の炭化水素基を示す。Ｒ１及びＲ２は閉環して置換基を有していてもよい環状構造を形成してもよい。〕
（Ｆ）下記式（５）で示される化合物、
[In Formula (4), Ring 1 represents an aromatic ring which may have a substituent. R 1 represents a C 1-5 hydrocarbon group which may have a substituent. R 2 represents hydrogen or a hydrocarbon group having 1 to 5 carbon atoms which may have a substituent. R 1 and R 2 may be closed to form a cyclic structure which may have a substituent. ]
(F) a compound represented by the following formula (5),
〔式（５）中、Ｒ１は置換基を有していてもよい炭素数１〜５の炭化水素基を示す。Ｒ２は水素又は置換基を有していてもよい炭素数１〜５の炭化水素基を示す。Ｒｉｎｇ１は置換基を有していてもよい芳香環を示す。〕
からなる群から選択される少なくとも１種である、上記項１〜４のいずれかに記載の吸収方法。
６．前記ヒドロキシ−ケトン構造を有する化合物は、グルコノラクトンである、上記項１〜４のいずれかに記載の吸収方法。
７．前記非プロトン性極性溶媒中に炭酸ガスをバブリングさせて接触させる、上記項１〜６のいずれかに記載の吸収方法。
[In formula (5), R 1 represents a hydrocarbon group of 1 to 5 carbon atoms which may have a substituent. R 2 represents hydrogen or a hydrocarbon group having 1 to 5 carbon atoms which may have a substituent. Ring 1 represents an aromatic ring which may have a substituent. ]
The absorption method according to any one of Items 1 to 4, which is at least one selected from the group consisting of:
6). Item 5. The absorption method according to any one of Items 1 to 4, wherein the compound having a hydroxy-ketone structure is gluconolactone.
7). Item 7. The absorption method according to any one of Items 1 to 6, wherein carbon dioxide gas is bubbled into contact with the aprotic polar solvent.
以下、本発明の炭酸ガスの吸収方法について詳細に説明する。 Hereinafter, the carbon dioxide absorption method of the present invention will be described in detail.
本発明の炭酸ガスの吸収方法は、ヒドロキシ−ケトン構造を有する化合物を溶解した非プロトン性極性溶媒に炭酸ガスを接触させることを特徴とする。 The method for absorbing carbon dioxide of the present invention is characterized in that carbon dioxide gas is brought into contact with an aprotic polar solvent in which a compound having a hydroxy-ketone structure is dissolved.
上記特徴を有する本発明の炭酸ガスの吸収方法は、ヒドロキシ−ケトン構造を有する化合物を溶解した非プロトン性極性溶媒に炭酸ガスを接触させることにより、ヒドロキシ−ケトン構造を有する化合物のカルボニル基に炭酸ガス（ＣＯ２）が求核付加反応することにより炭酸ガスが効率的に吸収（固定）される。 In the carbon dioxide gas absorption method of the present invention having the above characteristics, carbonic acid gas is brought into contact with an aprotic polar solvent in which a compound having a hydroxy-ketone structure is dissolved, whereby carbonic acid is added to the carbonyl group of the compound having a hydroxy-ketone structure. Carbon dioxide is efficiently absorbed (fixed) by the nucleophilic addition reaction of the gas (CO 2 ).
ヒドロキシ−ケトン構造を有する化合物としては限定的ではないが、例えば、下記（Ａ）〜（Ｆ）で示される化合物の少なくとも１種が使用できる。
（Ａ）ケトース化合物、
（Ｂ）下記式（１）で示される化合物、
Although it does not limit as a compound which has a hydroxy-ketone structure, For example, at least 1 sort (s) of the compound shown by the following (A)-(F) can be used.
(A) a ketose compound,
(B) a compound represented by the following formula (1),
〔式（１）中、Ｒ１及びＲ２は同一又は異なって置換基を有していてもよい炭素数１〜５の炭化水素基を示す。Ｒ３は水素又は置換基を有していてもよい炭素数１〜５の炭化水素基を示す。Ｒ２及びＲ３は閉環して置換基を有していてもよい環状構造を形成してもよい。〕
（Ｃ）下記式（２）で示される化合物、
[In Formula (1), R < 1 > and R < 2 > are the same or different, and show the C1-C5 hydrocarbon group which may have a substituent. R 3 represents hydrogen or a hydrocarbon group having 1 to 5 carbon atoms which may have a substituent. R 2 and R 3 may be closed to form a cyclic structure which may have a substituent. ]
(C) a compound represented by the following formula (2),
〔式（２）中、Ｒ１は水素、水酸基又は置換基を有していてもよい炭素数１〜５の炭化水素基を示す。ｎは１以上の正数を示す。環状構造は置換基を有していてもよい。〕
（Ｄ）下記式（３）で示される化合物、
[In the formula (2), R 1 represents hydrogen, a hydroxyl group or a hydrocarbon group having 1 to 5 carbon atoms which may have a substituent. n represents a positive number of 1 or more. The cyclic structure may have a substituent. ]
(D) a compound represented by the following formula (3),
〔式（３）中、Ｒｉｎｇ１及びＲｉｎｇ２は同一又は異なって置換基を有していてもよい芳香環を示す。〕
（Ｅ）下記式（４）で示される化合物、並びに、
[In Formula (3), Ring 1 and Ring 2 are the same or different and each represents an aromatic ring which may have a substituent. ]
(E) a compound represented by the following formula (4), and
〔式（４）中、Ｒｉｎｇ１は置換基を有していてもよい芳香環を示す。Ｒ１は置換基を有していてもよい炭素数１〜５の炭化水素基を示す。Ｒ２は水素又は置換基を有していてもよい炭素数１〜５の炭化水素基を示す。Ｒ１及びＲ２は閉環して置換基を有していてもよい環状構造を形成してもよい。〕
（Ｆ）下記式（５）で示される化合物、
[In Formula (4), Ring 1 represents an aromatic ring which may have a substituent. R 1 represents a C 1-5 hydrocarbon group which may have a substituent. R 2 represents hydrogen or a hydrocarbon group having 1 to 5 carbon atoms which may have a substituent. R 1 and R 2 may be closed to form a cyclic structure which may have a substituent. ]
(F) a compound represented by the following formula (5),
〔式（５）中、Ｒ１は置換基を有していてもよい炭素数１〜５の炭化水素基を示す。Ｒ２は水素又は置換基を有していてもよい炭素数１〜５の炭化水素基を示す。Ｒｉｎｇ１は置換基を有していてもよい芳香環を示す。〕
そして、（Ａ）ケトース化合物としては、グルコノラクトンが好ましい。
[In formula (5), R 1 represents a hydrocarbon group of 1 to 5 carbon atoms which may have a substituent. R 2 represents hydrogen or a hydrocarbon group having 1 to 5 carbon atoms which may have a substituent. Ring 1 represents an aromatic ring which may have a substituent. ]
And (A) As a ketose compound, gluconolactone is preferable.
（Ｂ）式（１）で示される化合物としては、下記表１の（1-1）〜（1-4）の少なくとも１種が好ましい。 (B) The compound represented by the formula (1) is preferably at least one of (1-1) to (1-4) in Table 1 below.
（Ｃ）式（２）で示される化合物としては、下記表２の（2-1）〜（2-6）の少なくとも１種が好ましい。 (C) The compound represented by the formula (2) is preferably at least one of (2-1) to (2-6) in Table 2 below.
（Ｄ）式（３）で示される化合物としては、下記表３の（3-1）〜（3-5）の少なくとも１種が好ましい。 (D) As a compound shown by Formula (3), at least 1 sort (s) of (3-1)-(3-5) of following Table 3 is preferable.
（Ｅ）式（４）で示される化合物としては、下記表４の（4-1）に示される化合物が好ましい。 (E) As a compound shown by Formula (4), the compound shown by (4-1) of the following Table 4 is preferable.
（Ｆ）式（５）で示される化合物としては、下記表４の（4-2）に示される化合物が好ましい。 (F) As a compound shown by Formula (5), the compound shown by (4-2) of following Table 4 is preferable.
上記の（Ａ）〜（Ｆ）で示される化合物の中でも、（Ａ）ケトース化合物が好ましく、特にグルコノラクトンが好ましい。 Among the compounds represented by the above (A) to (F), (A) ketose compounds are preferable, and gluconolactone is particularly preferable.
上記グルコノラクトンとしては限定されないが、地球上で最も豊富なバイオマスであるセルロースを原料として合成することが好ましい。即ち、可溶化セルロースを溶媒中で酸分解することによりグルコースとし、更にグルコースを酸化することによりグルコノラクトンを合成することが好ましい。 Although it does not limit as said gluconolactone, It is preferable to synthesize | combine using the cellulose which is the most abundant biomass on the earth as a raw material. That is, it is preferable to synthesize solubilized cellulose into glucose by acidolysis in a solvent and further synthesize glucose by oxidizing glucose.
上記可溶化セルロースは、例えば、特開2009-179913号公報に記載された方法によって製造することが好ましい。具体的には、下記式（６）で示されるイオン液体を含有する溶媒中でセルロース原料を膨潤及び／または部分溶解、解繊させることにより製造することが好ましい。 The solubilized cellulose is preferably produced, for example, by the method described in JP-A-2009-179913. Specifically, the cellulose raw material is preferably produced by swelling and / or partial dissolution and defibration in a solvent containing an ionic liquid represented by the following formula (6).
〔式（６）中、Ｒ１は炭素数１〜４のアルキル基であり、Ｒ２は炭素数１〜４のアルキル基又はアリル基である。Ｘはハロゲン又は擬ハロゲンである。〕
上記セルロース原料としては限定的ではないが、例えば、木材、木粉、綿、麻、わら等の天然セルロース原料、クラフトパルプ、サルファイトパルプ等の木材化学処理パルプ、セミケミカルパルプ、古紙又はその再生パルプなどが挙げられる。これらの中でもコスト面、品質面、地球環境面より、木材パルプが好ましい。これらのセルロース原料は、処理の容易さ及び溶媒の浸透促進の目的から、適宜粉砕してから用いてもよい。
Wherein (6), R 1 is an alkyl group having 1 to 4 carbon atoms, R 2 is an alkyl group or an allyl group having 1 to 4 carbon atoms. X is halogen or pseudohalogen. ]
The cellulose raw material is not limited. For example, natural cellulose raw materials such as wood, wood powder, cotton, hemp, straw, etc., wood chemically treated pulp such as kraft pulp and sulfite pulp, semi-chemical pulp, waste paper or recycled paper Examples include pulp. Among these, wood pulp is preferable from the viewpoint of cost, quality, and global environment. These cellulose raw materials may be used after being appropriately pulverized for the purpose of ease of treatment and promotion of solvent penetration.
上記イオン液体としては、具体的には、１−ブチル−３−メチルイミダゾリウムクロリド、１−ブチル−３−メチルイミダゾリウムブロミド、１−アリル−３−メチルイミダゾリウムクロリド、１−アリル−３−メチルイミダゾリウムブロミド、１−プロピル−３−メチルイミダゾリウムブロミド等が挙げられる。 Specific examples of the ionic liquid include 1-butyl-3-methylimidazolium chloride, 1-butyl-3-methylimidazolium bromide, 1-allyl-3-methylimidazolium chloride, 1-allyl-3- Examples thereof include methyl imidazolium bromide and 1-propyl-3-methyl imidazolium bromide.
上記イオン液体のみでセルロース原料を処理することもできるが、溶解力が高く微細繊維まで溶解してしまうおそれがある場合、有機溶媒を添加して使用することが好ましい。添加する有機溶媒はイオン液体との相溶性、セルロース原料との親和性、混合溶媒の溶解性、粘度などを考慮し適宜選択すればよいが、例えば、Ｎ，Ｎ−ジメチルアセトアミド、Ｎ，Ｎ−ジメチルホルムアミド、１−メチル−２−ピロリドン、ジメチルスルフォキサイド、アセトニトリル、メタノール、エタノール等の少なくとも１種が好ましい。これらの有機溶媒の共存により、イオン液体はセルロース原料の微細繊維間への浸透が促進され、また、イオン液体による微細繊維の結晶構造の破壊を防ぐことができる。 Although the cellulose raw material can be treated only with the ionic liquid, it is preferable to add an organic solvent when there is a possibility that even a fine fiber may be dissolved because of high dissolving power. The organic solvent to be added may be appropriately selected in consideration of compatibility with the ionic liquid, affinity with the cellulose raw material, solubility of the mixed solvent, viscosity, and the like. For example, N, N-dimethylacetamide, N, N- At least one of dimethylformamide, 1-methyl-2-pyrrolidone, dimethyl sulfoxide, acetonitrile, methanol, ethanol and the like is preferable. By the coexistence of these organic solvents, the ionic liquid can promote the penetration of the cellulose raw material between the fine fibers, and can prevent the crystal structure of the fine fibers from being broken by the ionic liquid.
上記イオン液体を含有する溶媒は、イオン液体の含有率が２０〜１００重量％であることが好ましい。イオン液体の含有量をこの範囲で設定すると、溶媒のセルロース微細繊維間への速やかな浸透、膨潤が生じ、抽出効率と微細繊維へのダメージの低減を両立することができる。 The solvent containing the ionic liquid preferably has an ionic liquid content of 20 to 100% by weight. When the content of the ionic liquid is set within this range, rapid penetration and swelling of the solvent between the cellulose fine fibers occurs, and both the extraction efficiency and the reduction of damage to the fine fibers can be achieved.
上記イオン液体を含有する溶媒中でセルロース原料を膨潤させることとは、セルロース原料を構成する微細繊維が若干弛緩し、外力により開裂し易い状態にあることを意味する。部分溶解とは、高い結晶性の微細繊維の間に結合剤として存在する物質を溶解することを意味する。これらの物質は、セルロース原料の場合はリグニン、ヘミセルロース及び非結晶のセルロースである。更に解繊とはセルロース原料を構成する微細繊維の本来の配向状態から無秩序な状態に変化することを指す。 Swelling the cellulose raw material in the solvent containing the ionic liquid means that the fine fibers constituting the cellulose raw material are slightly relaxed and are easily cleaved by an external force. Partial dissolution means dissolving a substance present as a binder between highly crystalline fine fibers. These substances are lignin, hemicellulose and amorphous cellulose in the case of cellulose raw materials. Furthermore, defibration refers to a change from the original orientation state of the fine fibers constituting the cellulose raw material to a disordered state.
イオン液体を含有する溶媒でセルロース原料を膨潤させた後、機械処理（ホモジナイズ処理）又は超音波処理により更に解繊することが好ましい。イオン液体を含有する溶媒により膨潤処理を行なったセルロース原料は、微細繊維間の結合が弱くなっているため、外力の作用により微細繊維は容易に解繊される。上記過程を経ることにより、可溶化セルロースが得られる。 It is preferable that the cellulose raw material is swollen with a solvent containing an ionic liquid and then further defibrated by mechanical treatment (homogenization treatment) or ultrasonic treatment. The cellulose raw material that has been subjected to the swelling treatment with the solvent containing the ionic liquid has weak bonds between the fine fibers, and therefore the fine fibers are easily defibrated by the action of external force. Through the above process, solubilized cellulose is obtained.
本発明では、上記により得られた可溶化セルロースを溶媒中でそのまま酸分解することによりグルコースとし、更にグルコースを酸化することによりグルコノラクトンを合成することが好ましい。酸分解及び酸化の方法については、常法に従って行えばよい。 In the present invention, it is preferable to synthesize gluconolactone by oxidizing the solubilized cellulose obtained in the above as it is in the solvent to produce glucose, and further oxidizing the glucose. What is necessary is just to perform according to a conventional method about the method of acid decomposition and oxidation.
本発明では、ヒドロキシ−ケトン構造を有する化合物を溶解した非プロトン性極性溶媒を炭酸ガス吸収剤として用いる。非プロトン性極性溶媒としては限定されないが、イオン液体が好ましく、上述した式（６）で示されるイオン液体を含有する溶媒をそのまま用いることができる。 In the present invention, an aprotic polar solvent in which a compound having a hydroxy-ketone structure is dissolved is used as a carbon dioxide gas absorbent. Although it does not limit as an aprotic polar solvent, An ionic liquid is preferable and the solvent containing the ionic liquid shown by Formula (6) mentioned above can be used as it is.
非プロトン性極性溶媒中のヒドロキシ−ケトン構造を有する化合物の含有量は限定的ではないが、非プロトン性極性溶媒を常温で使用する場合には４５重量％以上が好ましく、４５〜６０重量％がより好ましい。含有量が多過ぎると、粘度が高くなり炭酸ガスの接触（例えば、バブリング）が困難となるおそれがある。 The content of the compound having a hydroxy-ketone structure in the aprotic polar solvent is not limited. However, when the aprotic polar solvent is used at room temperature, it is preferably 45% by weight or more and 45 to 60% by weight. More preferred. When there is too much content, there exists a possibility that a viscosity may become high and the contact (for example, bubbling) of a carbon dioxide gas may become difficult.
非プロトン性極性溶媒の温度は限定的ではないが、２０〜１５０℃が好ましく、５０〜１００℃がより好ましい。この温度を採用することにより、炭酸ガス吸収効率を高めることができる。 Although the temperature of an aprotic polar solvent is not limited, 20-150 degreeC is preferable and 50-100 degreeC is more preferable. By adopting this temperature, the carbon dioxide absorption efficiency can be increased.
非プロトン性極性溶媒中には、触媒を含有することが好ましい。触媒としては、白金、酸化亜鉛及びゼオライトからなる群から選択される少なくとも１種が好ましい。触媒の含有量は限定的ではないが、数ｐｐｍ〜数十重量％程度の範囲で適宜調整できる。 The aprotic polar solvent preferably contains a catalyst. The catalyst is preferably at least one selected from the group consisting of platinum, zinc oxide and zeolite. The catalyst content is not limited, but can be appropriately adjusted within a range of several ppm to several tens of weight percent.
炭酸ガスの接触方法は限定的ではなく、例えば、吹き込み（バブリング）によって接触させることが好ましい。この接触により、ヒドロキシ−ケトン構造を有する化合物のカルボニル基に炭酸ガス（ＣＯ２）が求核付加反応することにより炭酸ガスが効率的に吸収（固定）される。 The method for contacting the carbon dioxide gas is not limited. For example, it is preferable that the carbon dioxide gas is brought into contact by bubbling. By this contact, carbon dioxide gas (CO 2 ) undergoes a nucleophilic addition reaction to the carbonyl group of the compound having a hydroxy-ketone structure, whereby carbon dioxide gas is efficiently absorbed (fixed).
本発明の炭酸ガスの吸収方法は、ヒドロキシ−ケトン構造を有する化合物を溶解した非プロトン性極性溶媒に炭酸ガスを接触させることにより、ヒドロキシ−ケトン構造を有する化合物のカルボニル基に炭酸ガス（ＣＯ２）が求核付加反応することにより炭酸ガスが効率的に吸収（固定）される。 Absorption method the carbon dioxide gas of the present invention are hydroxy - by contacting in an aprotic polar solvent to dissolve the compound having a ketone structure carbon dioxide, hydroxy - carbon dioxide to the carbonyl group of the compound having a ketone structure (CO 2 ) Undergoes a nucleophilic addition reaction, whereby carbon dioxide is efficiently absorbed (fixed).
以下に実施例を示して本発明を具体的に説明する。但し本発明は実施例に限定されない。 The present invention will be specifically described below with reference to examples. However, the present invention is not limited to the examples.
実施例１〜７
イオン液体である１−ブチル−３−メチルイミダゾリウムクロリド（BMIMCL）とＮ，Ｎ−ジメチルアセトアミド（DMAC）を３：１に混合し、８０℃に加熱した後、撹拌しながらそこにグルコノラクトンを４５重量％の含有量となるように徐々に溶解した。
Examples 1-7
The ionic liquid 1-butyl-3-methylimidazolium chloride (BMIMCL) and N, N-dimethylacetamide (DMAC) are mixed at a ratio of 3: 1, heated to 80 ° C., and then mixed with gluconolactone with stirring. Was gradually dissolved to a content of 45% by weight.
上記溶液に炭酸ガスをバブリングすることにより炭酸ガスを吸収させた。なお、実施例１〜２では、溶液温度を室温まで冷却してから使用した。 Carbon dioxide was absorbed by bubbling carbon dioxide into the solution. In Examples 1-2, the solution temperature was cooled to room temperature before use.
各実施例における触媒の有無、反応時間、反応温度及び反応率を下記表５に示す。 The presence / absence of catalyst, reaction time, reaction temperature and reaction rate in each Example are shown in Table 5 below.
〔＊反応率は、残存グルコノラクトンと生成物（炭酸ガス付加物）の比率から算出した〕
表５の結果から明らかなように、非プロトン性極性溶媒を加熱して用いることにより、炭酸ガスの吸収速度を促進することができる。また、加熱すると共に触媒を用いることにより炭酸ガスの吸収速度及び吸収効率を更に促進することができる。
[ * The reaction rate was calculated from the ratio of residual gluconolactone and product (carbon dioxide adduct)]
As is apparent from the results in Table 5, the absorption rate of carbon dioxide gas can be promoted by heating and using the aprotic polar solvent. Moreover, the absorption rate and absorption efficiency of carbon dioxide can be further promoted by heating and using a catalyst.
Claims (7)
（Ａ）ケトース化合物、
（Ｂ）下記式（１）で示される化合物、
（Ｃ）下記式（２）で示される化合物、
（Ｄ）下記式（３）で示される化合物、
（Ｅ）下記式（４）で示される化合物、並びに、
（Ｆ）下記式（５）で示される化合物、
からなる群から選択される少なくとも１種である、請求項１〜４のいずれかに記載の吸収方法。 The compounds having the hydroxy-ketone structure are the following (A) to (F):
(A) a ketose compound,
(B) a compound represented by the following formula (1),
(C) a compound represented by the following formula (2),
(D) a compound represented by the following formula (3),
(E) a compound represented by the following formula (4), and
(F) a compound represented by the following formula (5),
The absorption method according to claim 1, wherein the absorption method is at least one selected from the group consisting of:
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