JP4602642B2 - N-hydroxyalkyl saturated heterocyclic ammonium salt and process for producing the same - Google Patents
N-hydroxyalkyl saturated heterocyclic ammonium salt and process for producing the same Download PDFInfo
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- JP4602642B2 JP4602642B2 JP2003049942A JP2003049942A JP4602642B2 JP 4602642 B2 JP4602642 B2 JP 4602642B2 JP 2003049942 A JP2003049942 A JP 2003049942A JP 2003049942 A JP2003049942 A JP 2003049942A JP 4602642 B2 JP4602642 B2 JP 4602642B2
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- saturated heterocyclic
- heterocyclic ammonium
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E60/30—Hydrogen technology
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Description
【0001】
【発明の属する技術分野】
本発明は新規なN−ヒドロキシアルキル飽和複素環式アンモニウム塩及びその製造法に関する。
【0002】
【従来の技術】
本発明のN−ヒドロキシアルキル飽和複素環式アンモニウム塩は、文献未記載の新規な化合物である。
【0003】
近年、常温(常温は25℃を意味する。以下同じ。)において液状を示す第四級アンモニウム塩(以下、常温溶融塩という。)が、固体高分子型燃料電池の電解質膜、有機合成反応溶媒等において使用されることから注目を浴び、新しい常温溶融塩が種々提案されている(例えば、非特許文献1参照)。
【0004】
【非特許文献1】
M.Watanabe,Electrochim.Acta,45,1265−1270(2000)
【0005】
【発明が解決しようとする課題】
本発明は、固体高分子型燃料電池の電解質膜への利用が期待できる、プロトン伝導能を付与した新規な常温溶融塩及びその製造法を提供することを課題とする。
【0006】
【課題を解決するための手段】
本発明者らは上記課題を解決するために鋭意検討を行ったところ、上記課題を解決し得る新規な常温溶融塩である、カチオン成分を構成する窒素原子に結合した置換基としてヒドロキシアルキル基を有する含窒素飽和複素環式アンモニウム塩を見出し、本発明を完成するに至った。
【0007】
即ち、本発明は、一般式(1):
【0008】
【化5】
【0009】
{式中、R1はアルキル基又はアラルキル基を、Yは酸素原子又はメチレン基を及びA-はビストリフルオロメタンスルホニルイミダートイオン〔(CF3SO2)2N-〕、テトラフルオロボレートイオン(F4B-)またはヘキサフルオロホスファートイオン(PF6 -)を表す。mは1〜4の整数及びnは0又は1である。}で示されるN−ヒドロキシアルキル飽和複素環式アンモニウム塩〔以下、N−ヒドロキシアルキル飽和複素環式アンモニウム塩(1)という。〕、並びに一般式(2):
【0010】
【化6】
【0011】
(式中、R1、Y、m、n及びX-は前記に同じ。)で示されるN−ヒドロキシアルキル飽和複素環式アンモニウム=ハライド〔以下、N−ヒドロキシアルキル飽和複素環式アンモニウム=ハライド(2)という。〕を一般式(3):
【0012】
AM (3)
{式中、Aはビストリフルオロメタンスルホニルイミダート〔(CF3SO2)2N〕、テトラフルオロボレート(F4B)またはヘキサフルオロホスファート(PF6)を及びMは水素原子又はアルカリ金属を表す。}で示される化合物(以下、化合物(3)という。)と反応させることを特徴とするN−ヒドロキシアルキル飽和複素環式アンモニウム塩(1)の製造方法に関する。
【0013】
【発明の実施の形態】
以下、本発明を詳細に説明する。
【0014】
本発明のN−ヒドロキシアルキル飽和複素環式アンモニウム塩(1)は、上記一般式(1)で表される化合物であり、一般式(1)中のR1はアルキル基又はアラルキル基を、Yは酸素原子又はメチレン基を及びA-はビストリフルオロメタンスルホニルイミダートイオン〔(CF3SO2)2N-〕、テトラフルオロボレートイオン(F4B-)またはヘキサフルオロホスファートイオン(PF6 -)を表し、並びにmは1〜4の整数及びnは0又は1である。R1で表されるアルキル基としては、炭素数1〜18の直鎖状又は分岐鎖状のアルキル基が挙げられ、好ましくは炭素数1〜6の直鎖状又は分岐鎖状のアルキル基であり、メチル基、エチル基、プロピル基、イソプロピル基、ブチル基等が挙げられ、好ましくはメチル基である。またアラルキル基としてはそれぞれベンゼン環にメチル基、エチル基等の低級アルキル基を1個以上有していてもよいベンジル基、1−フェネチル基、2−フェネチル基などが挙げられ、好ましくはベンジル基である。
【0015】
好ましいN−ヒドロキシアルキル飽和複素環式アンモニウム塩(1)は、一般式(6):
【0016】
【化7】
【0017】
(式中、R1はアルキル基を表す。Y、A-およびnは前記に同じ。)で示されるN−ヒドロキシアルキル飽和複素環式アンモニウム塩である。
【0018】
好ましいN−ヒドロキシアルキル飽和複素環式アンモニウム塩(1)の具体例としては、N−(2−ヒドロキシエチル)−N−メチルピロリジニウム=ビストリフルオロメタンスルホニルイミダート、N−(2−ヒドロキシエチル)−N−メチルピペリジニウムイオン=ビストリフルオロメタンスルホニルイミダート、N−(2−ヒドロキシエチル)−N−メチルモルフォリニウム=ビストリフルオロメタンスルホニルイミダート、N−(2−ヒドロキシエチル)−N−メチルピロリジニウム=テトラフルオロボレート、N−(2−ヒドロキシエチル)−N−メチルピペリジニウムイオン=テトラフルオロボレート、N−(2−ヒドロキシエチル)−N−メチルモルフォリニウム=テトラフルオロボレート、N−(2−ヒドロキシエチル)−N−メチルピロリジニウム=ヘキサフルオロホスファート、N−(2−ヒドロキシエチル)−N−メチルピペリジニウムイオン=ヘキサフルオロホスファート、N−(2−ヒドロキシエチル)−N−メチルモルフォリニウム=ヘキサフルオロホスファート等が挙げられる。
【0019】
特に好ましくはN−(2−ヒドロキシエチル)−N−メチルピロリジニウム=ビストリフルオロメタンスルホニルイミダート、N−(2−ヒドロキシエチル)−N−メチルピペリジニウムイオン=ビストリフルオロメタンスルホニルイミダート、N−(2−ヒドロキシエチル)−N−メチルモルフォリニウム=ビストリフルオロメタンスルホニルイミダートであり、これらは室温で低粘度のため常温溶融塩として特に有用である。
【0020】
本発明のN−ヒドロキシアルキル飽和複素環式アンモニウム塩(1)は、種々の方法で製造することができる。好ましい製造法としては、N−ヒドロキシアルキル飽和複素環式アンモニウム=ハライド(2)を化合物(3)と反応させてN−ヒドロキシアルキル飽和複素環式アンモニウム=ハライド(2)のハロゲンイオンをビストリフルオロメタンスルホニルイミダートイオン[(CF3SO2)2N- ]、テトラフルオロボラートイオン(F4B-)又はヘキサフルオロホスファートイオン(PF6 -)にイオン交換することによって製造する方法が挙げられる。
【0021】
N−ヒドロキシアルキル飽和複素環式アンモニウム=ハライド(2)のハロゲンイオンとしては、塩素イオン、臭素イオン、ヨウ素イオン等が挙げられる。
【0022】
化合物(3)としては、ビストリフルオロメチルスルホニルイミド酸[(CF3SO2)2NH]、テトラフルオロ硼酸(HBF4)、ヘキサフルオロリン酸(HPF6)、およびそれらのアルカリ金属塩(例えば、リチウム塩、ナトリウム塩、カリウム塩等)が挙げられる。化合物(3)の使用量は、N−ヒドロキシアルキル飽和複素環式アンモニウム(2)1モルに対して1.0モル〜1.2モル好ましくは 1.01モル〜1.05モルである。
【0023】
イオン交換は、次のようにして行う。N−ヒドロキシアルキル飽和複素環式アンモニウム=ハライド(2)と化合物(3)とをN−ヒドロキシアルキル飽和複素環式アンモニウム=ハライド(2)1重量部に対して1重量部〜10重量部好ましくは1重量部〜4重量部の水中で10℃〜60℃好ましくは10℃〜30℃で1時間〜24時間好ましくは1時間〜4時間混合し、得られた水溶液に水との溶解性が低い有機溶媒(例えば、酢酸エチル、塩化メチレン等)をN−ヒドロキシアルキル飽和複素環式アンモニウム=ハライド(2)1重量部に対して1重量部〜10重量部、好ましくは1重量部〜4重量部加えて混合する。その後、水層と有機層を分液すれば、有機層としてN−ヒドロキシアルキル飽和複素環式アンモニウム塩(1)の溶液が得られる。得られた有機層を所望により水洗し、次いで有機溶媒を留出除去すれば残渣としてN−ヒドロキシアルキル飽和複素環式アンモニウム塩(1)が得られる。
【0024】
N−ヒドロキシアルキル飽和複素環式アンモニウム=ハライド(2)は、一般式(4):
【0025】
【化8】
【0026】
(R1、Y及びnは前記に同じ。)で示される飽和複素環式アミン類(以下、飽和複素環式アミン類(4)という)を一般式(5):
【0027】
【化9】
【0028】
(式中、X及びmは前記に同じ。)で示されるハロゲノアルキルアルコール(以下、ハロゲノアルキルアルコール(5)という。)と反応させれば製造することができる。
【0029】
飽和複素環式アミン類(4)としては、例えば、N−メチルピペリジン、N−エチルピペリジン等のN−アルキルピペリジン、N−メチルピロリジン、N−エチルピロリジン等のN−アルキルピロリジン、N−メチルモルフォリン、N−エチルモルフォリン等のN−アルキルモルフォリン等を挙げることができ、好ましくはN−アルキルピロリジンである。
【0030】
またハロゲノアルキルアルコール(5)としては、例えば、2−ブロモエタノール、2−クロロエタノール、4−ブロモブタノール等が挙げられ、好ましくは2−ブロモエタノールである。ハロゲノアルキルアルコール(5)の使用量は、飽和複素環式アミン類(4)1モルに対して1モル以上であればよく、好ましくは1.1−2.0モルである。
【0031】
飽和複素環式アミン類(4)とハロゲノアルキルアルコール(5)の反応は、通常溶媒中で行われる。溶媒としては、メタノール、エタノール、イソプロパノール等のアルコール類、アセトニトリル、酢酸エチル、テトラヒドロフラン、ジメチルホルムアミド等が挙げられる。溶媒の使用量は特に制限はないが、飽和複素環式アミン類(4)1重量部に対して通常1〜10重量部、好ましくは2〜5重量部である。
【0032】
飽和複素環式アミン類(4)とハロゲノアルキルアルコール(5)の反応を実施するには、例えば、飽和複素環式アミン類(4)、ハロゲノアルキルアルコール(5)及び溶媒の混合物を、反応に使用する溶媒の種類にもよるが、通常20℃以上、好ましくは60℃〜120℃にて攪拌するだけでよい。反応時間は通常4〜12時間である。
【0033】
このようにしてN−ヒドロキシアルキル飽和複素環式アンモニウム=ハライド(2)を含む反応混合物を得た後、得られた反応混合物を濃縮乾固してN−ヒドロキシアルキル飽和複素環式アンモニウム=ハライド(2)を主成分とする残渣を得る。次いで残渣を有機溶媒(例えば、エチルエーテル、酢酸エチル、メチルエチルケトン、メチルイソブチルケトン等)と混合し、残渣に含まれる未反応原料等を有機溶媒に溶解した後、濾過する。このようにすると濾滓として高純度のN−ヒドロキシアルキル飽和複素環式アンモニウム=ハライド(2)が得られる。
【0034】
【実施例】
以下に実施例を示し、本発明を更に具体的に説明するが、本発明は以下の実施例に限定されるものではない。
【0035】
実施例1
N−メチルピペリジン20g(0.20モル)、2−ブロモエタノール30g(0.24モル)及びアセトニトリル40gの混合物を、80℃で24時間攪拌して反応させた。反応終了後、得られた反応混合物を濃縮し、残渣にメチルエチルケトン50gを加えて固形物を洗浄し、濾過した。濾滓を減圧下に乾燥してN−(2−ヒドロキシエチル)−N−メチルピペリジニウム=ブロミド35.4g(0.158モル)を得た。
【0036】
このようにして得たN−(2−ヒドロキシエチル)−N−メチルピペリジニウム=ブロミド35.4g(0.158モル)を水100gに溶解させ、トリフルオロメチルスルホニルイミド酸リチウム〔(F3CSO2)2NLi〕45.8g(0.160モル)を混合して1時間室温で攪拌し、得られた混合物に塩化メチレン100gを加えて混合した後、分液して得られた有機層を水50gで2回洗浄した。その後有機層から塩化メチレンを留去して油状のN−(2−ヒドロキシエチル)−N−メチルピペリジニウム=ビストリフルオロメチルスルホンイミダート47g(0.111モル、収率55.3%)を得た。得られたN−(2−ヒドロキシエチル)−N−メチルピペリジニウム=ビストリフルオロメチルスルホンイミダートのNMRの分析結果を次に示す。
【0037】
1H−NMR(CDCl3)δ ppm:3.99(bs、2H)、3.43−3.28(m、7H)、3.08(s、3H)、1.87−1.84(bm、4H)、1.66−1.64(bm、2H)
【0038】
このアンモニウム塩の粘度、電位窓およびイオン伝導度を表1に示す。なお、粘度はE型粘度計、電位窓はCV−50(ビー・エー・エス株式会社製)を使用したCV測定〔RE:SCE、WE:GC(直径3mm)、CE:Pt、Scan rate:10mV/s〕にて、イオン伝導度は卓上電導度計CM−30S(東亜ディーケーケー株式会社製)を使用してそれぞれ測定した。
【0039】
実施例2
実施例1においてN−メチルピペリジンに代えてN−メチルピロリジン17g(0.20モル)を使用した以外は実施例1と同様に行い、油状のN−(2−ヒドロキシエチル)−N−メチルピロリジニウム=ビストリフルオロメチルスルホンイミダート43g(0.104モル、収率52.0%)を得た。得られたN−(2−ヒドロキシエチル)−N−メチルピロリジニウム=ビストリフルオロメチルスルホンイミダートのNMR測定結果を次に示す。
【0040】
1H−NMR(CDCl3)δ ppm:3.96(bs、2H)、3.49(m、4H)、3.42−3.38(m、3H)、3.03(s、3H)、2.17(bm、4H)
【0041】
このアンモニウム塩の粘度、電位窓およびイオン伝導度を実施例1と同様にして測定しその結果を表1に示す。
【0042】
【表1】
【0043】
【発明の効果】
本発明によれば、固体高分子型燃料電池の電解質膜への利用が期待され得る、プロトン伝導能を有する新規な常温溶融塩及びその製造方法を提供できる。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a novel N-hydroxyalkyl saturated heterocyclic ammonium salt and a process for producing the same.
[0002]
[Prior art]
The N-hydroxyalkyl saturated heterocyclic ammonium salt of the present invention is a novel compound not described in any literature.
[0003]
In recent years, quaternary ammonium salts (hereinafter referred to as room temperature molten salts) which are liquid at room temperature (room temperature means 25 ° C., the same shall apply hereinafter) are used as electrolyte membranes and organic synthesis reaction solvents for polymer electrolyte fuel cells. Various new ambient temperature molten salts have been proposed (see Non-Patent Document 1, for example).
[0004]
[Non-Patent Document 1]
M.M. Watanabe, Electrochim. Acta, 45 , 1265-1270 (2000)
[0005]
[Problems to be solved by the invention]
An object of the present invention is to provide a novel room temperature molten salt imparted with proton conductivity and expected to be used for an electrolyte membrane of a polymer electrolyte fuel cell, and a method for producing the same.
[0006]
[Means for Solving the Problems]
The inventors of the present invention have made extensive studies to solve the above-mentioned problems. As a result, a novel room temperature molten salt capable of solving the above-mentioned problems, a hydroxyalkyl group as a substituent bonded to the nitrogen atom constituting the cation component is used. The present inventors have found a nitrogen-containing saturated heterocyclic ammonium salt having the present invention and completed the present invention.
[0007]
That is, the present invention relates to the general formula (1):
[0008]
[Chemical formula 5]
[0009]
{Wherein R 1 represents an alkyl group or an aralkyl group, Y represents an oxygen atom or a methylene group, and A − represents a bistrifluoromethanesulfonyl imidate ion [(CF 3 SO 2 ) 2 N − ], a tetrafluoroborate ion ( F 4 B − ) or hexafluorophosphate ion (PF 6 − ). m is an integer of 1 to 4, and n is 0 or 1. } N-hydroxyalkyl saturated heterocyclic ammonium salt [hereinafter referred to as N-hydroxyalkyl saturated heterocyclic ammonium salt (1). And general formula (2):
[0010]
[Chemical 6]
[0011]
(Wherein R 1 , Y, m, n and X − are the same as above) N-hydroxyalkyl saturated heterocyclic ammonium = halide [hereinafter, N-hydroxyalkyl saturated heterocyclic ammonium = halide ( 2). ] In general formula (3):
[0012]
AM (3)
{Wherein A represents bistrifluoromethanesulfonyl imidate [(CF 3 SO 2 ) 2 N], tetrafluoroborate (F 4 B) or hexafluorophosphate (PF 6 ), and M represents a hydrogen atom or an alkali metal. To express. } (Hereinafter referred to as the compound (3)), the method for producing an N-hydroxyalkyl saturated heterocyclic ammonium salt (1).
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail.
[0014]
The N-hydroxyalkyl saturated heterocyclic ammonium salt (1) of the present invention is a compound represented by the above general formula (1), wherein R 1 in the general formula (1) represents an alkyl group or an aralkyl group, Y Represents an oxygen atom or a methylene group, and A − represents a bistrifluoromethanesulfonyl imidate ion [(CF 3 SO 2 ) 2 N − ], a tetrafluoroborate ion (F 4 B − ) or a hexafluorophosphate ion (PF 6 − ), And m is an integer of 1 to 4 and n is 0 or 1. Examples of the alkyl group represented by R 1 include a linear or branched alkyl group having 1 to 18 carbon atoms, preferably a linear or branched alkyl group having 1 to 6 carbon atoms. A methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, and the like, preferably a methyl group. Examples of the aralkyl group include a benzyl group, a 1-phenethyl group, and a 2-phenethyl group, each of which may have one or more lower alkyl groups such as a methyl group and an ethyl group on the benzene ring, preferably a benzyl group. It is.
[0015]
Preferred N-hydroxyalkyl saturated heterocyclic ammonium salts (1) are those of the general formula (6):
[0016]
[Chemical 7]
[0017]
(In the formula, R 1 represents .Y, A alkyl group - and n are as defined above.) Is N- hydroxyalkyl saturated heterocyclic ammonium salt represented by.
[0018]
Specific examples of preferable N-hydroxyalkyl saturated heterocyclic ammonium salt (1) include N- (2-hydroxyethyl) -N-methylpyrrolidinium = bistrifluoromethanesulfonyl imidate, N- (2-hydroxyethyl). ) -N-methylpiperidinium ion = bistrifluoromethanesulfonyl imidate, N- (2-hydroxyethyl) -N-methylmorpholinium = bistrifluoromethanesulfonyl imidate, N- (2-hydroxyethyl) -N- Methylpyrrolidinium = tetrafluoroborate, N- (2-hydroxyethyl) -N-methylpiperidinium ion = tetrafluoroborate, N- (2-hydroxyethyl) -N-methylmorpholinium = tetrafluoroborate, N -(2-hydroxyethyl)- -Methylpyrrolidinium = hexafluorophosphate, N- (2-hydroxyethyl) -N-methylpiperidinium ion = hexafluorophosphate, N- (2-hydroxyethyl) -N-methylmorpholinium = hexafluoro A phosphate etc. are mentioned.
[0019]
Particularly preferably, N- (2-hydroxyethyl) -N-methylpyrrolidinium = bistrifluoromethanesulfonyl imidate, N- (2-hydroxyethyl) -N-methylpiperidinium ion = bistrifluoromethanesulfonyl imidate, N -(2-Hydroxyethyl) -N-methylmorpholinium = bistrifluoromethanesulfonyl imidate, which are particularly useful as room temperature molten salts because of their low viscosity at room temperature.
[0020]
The N-hydroxyalkyl saturated heterocyclic ammonium salt (1) of the present invention can be produced by various methods. As a preferred production method, N-hydroxyalkyl saturated heterocyclic ammonium halide (2) is reacted with compound (3) to convert the halogen ion of N-hydroxyalkyl saturated heterocyclic ammonium halide (2) to bistrifluoromethane. Examples thereof include a method of producing a sulfonyl imidate ion [(CF 3 SO 2 ) 2 N − ], tetrafluoroborate ion (F 4 B − ) or hexafluorophosphate ion (PF 6 − ) by ion exchange. .
[0021]
Examples of the halogen ion of N-hydroxyalkyl saturated heterocyclic ammonium halide (2) include chlorine ion, bromine ion and iodine ion.
[0022]
Compound (3) includes bistrifluoromethylsulfonylimidic acid [(CF 3 SO 2 ) 2 NH], tetrafluoroboric acid (HBF 4 ), hexafluorophosphoric acid (HPF 6 ), and alkali metal salts thereof (for example, Lithium salt, sodium salt, potassium salt, etc.). The amount of compound (3) to be used is 1.0 mol to 1.2 mol, preferably 1.01 mol to 1.05 mol, per 1 mol of N-hydroxyalkyl saturated heterocyclic ammonium (2).
[0023]
Ion exchange is performed as follows. The N-hydroxyalkyl saturated heterocyclic ammonium halide (2) and the compound (3) are preferably 1 to 10 parts by weight with respect to 1 part by weight of the N-hydroxyalkyl saturated heterocyclic ammonium halide (2). Mixing in 1 to 4 parts by weight of water at 10 ° C to 60 ° C, preferably 10 ° C to 30 ° C for 1 hour to 24 hours, preferably 1 hour to 4 hours, and the resulting aqueous solution has low solubility in water. 1 part by weight to 10 parts by weight, preferably 1 part by weight to 4 parts by weight of an organic solvent (for example, ethyl acetate, methylene chloride, etc.) per 1 part by weight of N-hydroxyalkyl saturated heterocyclic ammonium halide (2) Add and mix. Then, if a water layer and an organic layer are liquid-separated, the solution of N-hydroxyalkyl saturated heterocyclic ammonium salt (1) will be obtained as an organic layer. The obtained organic layer is washed with water if desired, and then the organic solvent is distilled off to obtain N-hydroxyalkyl saturated heterocyclic ammonium salt (1) as a residue.
[0024]
N-hydroxyalkyl saturated heterocyclic ammonium halide (2) has the general formula (4):
[0025]
[Chemical 8]
[0026]
(R 1 , Y and n are the same as defined above) A saturated heterocyclic amine represented by the following general formula (5):
[0027]
[Chemical 9]
[0028]
It can be produced by reacting with a halogenoalkyl alcohol represented by the formula (wherein X and m are the same as above) (hereinafter referred to as halogenoalkyl alcohol (5)).
[0029]
Examples of the saturated heterocyclic amines (4) include N-alkylpiperidines such as N-methylpiperidine and N-ethylpiperidine, N-alkylpyrrolidines such as N-methylpyrrolidine and N-ethylpyrrolidine, and N-methylmorpholines. N-alkylmorpholines such as phosphorus and N-ethylmorpholine can be mentioned, and N-alkylpyrrolidine is preferred.
[0030]
Examples of the halogenoalkyl alcohol (5) include 2-bromoethanol, 2-chloroethanol, 4-bromobutanol and the like, preferably 2-bromoethanol. The usage-amount of halogeno alkyl alcohol (5) should just be 1 mol or more with respect to 1 mol of saturated heterocyclic amines (4), Preferably it is 1.1-2.0 mol.
[0031]
The reaction of the saturated heterocyclic amine (4) and the halogenoalkyl alcohol (5) is usually carried out in a solvent. Examples of the solvent include alcohols such as methanol, ethanol and isopropanol, acetonitrile, ethyl acetate, tetrahydrofuran, dimethylformamide and the like. Although there is no restriction | limiting in particular in the usage-amount of a solvent, It is 1-10 weight part normally with respect to 1 weight part of saturated heterocyclic amines (4), Preferably it is 2-5 weight part.
[0032]
In order to carry out the reaction of the saturated heterocyclic amine (4) and the halogenoalkyl alcohol (5), for example, a mixture of the saturated heterocyclic amine (4), the halogenoalkyl alcohol (5) and a solvent is reacted. Although it depends on the type of the solvent used, it is usually only stirred at 20 ° C. or higher, preferably 60 ° C. to 120 ° C. The reaction time is usually 4 to 12 hours.
[0033]
After obtaining a reaction mixture containing N-hydroxyalkyl saturated heterocyclic ammonium halide (2) in this way, the resulting reaction mixture was concentrated to dryness to give N-hydroxyalkyl saturated heterocyclic ammonium halide ( A residue mainly comprising 2) is obtained. Next, the residue is mixed with an organic solvent (for example, ethyl ether, ethyl acetate, methyl ethyl ketone, methyl isobutyl ketone, etc.), and unreacted raw materials contained in the residue are dissolved in the organic solvent, followed by filtration. In this way, high purity N-hydroxyalkyl saturated heterocyclic ammonium halide (2) is obtained as filter cake.
[0034]
【Example】
EXAMPLES The present invention will be described more specifically with reference to the following examples. However, the present invention is not limited to the following examples.
[0035]
Example 1
A mixture of 20 g (0.20 mol) of N-methylpiperidine, 30 g (0.24 mol) of 2-bromoethanol and 40 g of acetonitrile was reacted by stirring at 80 ° C. for 24 hours. After completion of the reaction, the resulting reaction mixture was concentrated, and 50 g of methyl ethyl ketone was added to the residue to wash the solid and filtered. The filter cake was dried under reduced pressure to obtain 35.4 g (0.158 mol) of N- (2-hydroxyethyl) -N-methylpiperidinium bromide.
[0036]
35.4 g (0.158 mol) of N- (2-hydroxyethyl) -N-methylpiperidinium bromide thus obtained was dissolved in 100 g of water, and lithium trifluoromethylsulfonylimidate [(F 3 CSO 2 ) 2 NLi] 45.8 g (0.160 mol) was mixed and stirred for 1 hour at room temperature, and 100 g of methylene chloride was added to the resulting mixture and mixed, followed by liquid separation. Was washed twice with 50 g of water. Thereafter, methylene chloride was distilled off from the organic layer, and 47 g (0.111 mol, yield 55.3%) of oily N- (2-hydroxyethyl) -N-methylpiperidinium = bistrifluoromethylsulfonimidate was obtained. Obtained. The NMR analysis results of the obtained N- (2-hydroxyethyl) -N-methylpiperidinium = bistrifluoromethylsulfonimidate are shown below.
[0037]
1 H-NMR (CDCl 3 ) δ ppm: 3.99 (bs, 2H), 3.43-3.28 (m, 7H), 3.08 (s, 3H), 1.87-1.84 ( bm, 4H), 1.66 to 1.64 (bm, 2H)
[0038]
Table 1 shows the viscosity, potential window and ionic conductivity of this ammonium salt. The viscosity is an E-type viscometer, and the potential window is CV measurement using CV-50 (manufactured by BAS Co., Ltd.) [RE: SCE, WE: GC (diameter: 3 mm), CE: Pt, Scan rate: 10 mV / s], the ion conductivity was measured using a tabletop conductivity meter CM-30S (manufactured by Toa DKK Corporation).
[0039]
Example 2
The same procedure as in Example 1 was carried out except that 17 g (0.20 mol) of N-methylpyrrolidine was used instead of N-methylpiperidine in Example 1, and oily N- (2-hydroxyethyl) -N-methylpyrrole was obtained. 43 g (0.104 mol, yield 52.0%) of dinium = bistrifluoromethylsulfonimidate was obtained. The NMR measurement results of the obtained N- (2-hydroxyethyl) -N-methylpyrrolidinium = bistrifluoromethylsulfonimidate are shown below.
[0040]
1 H-NMR (CDCl 3 ) δ ppm: 3.96 (bs, 2H), 3.49 (m, 4H), 3.42-3.38 (m, 3H), 3.03 (s, 3H) 2.17 (bm, 4H)
[0041]
The viscosity, potential window and ionic conductivity of this ammonium salt were measured in the same manner as in Example 1, and the results are shown in Table 1.
[0042]
[Table 1]
[0043]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, the novel normal temperature molten salt which has the proton-conducting capability which can be anticipated for the electrolyte membrane of a polymer electrolyte fuel cell, and its manufacturing method can be provided.
Claims (3)
AM (3)
{式中、Aはビストリフルオロメタンスルホニルイミダート[(CF3SO)2N]を及びMは水素原子又はアルカリ金属を表す。}で示される化合物とを反応させることを特徴とする請求項1記載のN−ヒドロキシアルキル飽和複素環式アンモニウム塩の製造方法。General formula (2):
AM (3)
{In the formula, A represents bistrifluoromethanesulfonyl imidate [(CF3SO) 2N ], and M represents a hydrogen atom or an alkali metal. The compound shown by these is made to react. The manufacturing method of the N-hydroxyalkyl saturated heterocyclic ammonium salt of Claim 1 characterized by the above-mentioned.
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WO2002076924A1 (en) * | 2001-03-26 | 2002-10-03 | Nisshinbo Industries, Inc., | Ionic liquid, electrolyte salt for storage device, electrolytic solution for storage device, electric double layer capacitor, and secondary battery |
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