JP4045611B2 - Process for producing isocyanates - Google Patents

Process for producing isocyanates Download PDF

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Publication number
JP4045611B2
JP4045611B2 JP03850697A JP3850697A JP4045611B2 JP 4045611 B2 JP4045611 B2 JP 4045611B2 JP 03850697 A JP03850697 A JP 03850697A JP 3850697 A JP3850697 A JP 3850697A JP 4045611 B2 JP4045611 B2 JP 4045611B2
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Japan
Prior art keywords
general formula
chloride
halogen atom
dihydrochloride
liquid composition
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JP03850697A
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JPH09316045A (en
Inventor
祐毅 中川
手崎清
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Nippon Soda Co Ltd
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Nippon Soda Co Ltd
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00Technologies relating to chemical industry
    • Y02P20/50Improvements relating to the production of bulk chemicals
    • Y02P20/52Improvements relating to the production of bulk chemicals using catalysts, e.g. selective catalysts

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  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)

Description

【0001】
【産業上の利用分野】
本発明は、有機イソシアナート化合物の製造方法に関するものである。有機イソシアナート化合物は弾性体、発泡体、塗料、接着剤、光学用プラスティックレンズの原料として有用である。
【0002】
【従来の技術】
イソシアナート類は、対応するアミン塩酸塩に有機溶媒中、ホスゲンを吹き込むことにより製造されるが、特にアミノ基が2以上あるポリアミン塩酸塩の場合、一般に反応の進行が非常に遅いことが知られている。例えば、ヘキサメチレンジアミン二塩酸塩の場合、反応を完結させるのに反応温度180〜185℃で8〜15時間かかる(Organic Synthesis,coll.vol.IV,521)。そのため、比較的温和な条件下、短時間で反応が完結するような工業的に優れた製造方法の開発が望まれていた。
【0003】
【発明が解決しようとする課題】
本発明は、従来の技術に比べ高い反応速度でイソシアナート類を製造する方法を提供することを目的とする。
【0004】
【課題を解決するための手段】
本発明者等は、ある種のイオン性を有する液体組成物を添加することにより、反応が非常に促進されることを見い出し本発明を完成した。即ち、本発明は、
一般式[I]
1 −(NH2 ・HCl)n [I]
(式中、R1 はその基の中に−CO2 −あるいは−O−を含んでいてもよい脂肪族あるいは芳香族の炭化水素基を、nは1以上の整数を示す。)で表されるアミン塩酸塩化合物を、有機溶媒中、一般式[II]
Al(X1 )(X2 )(X3 ) [II]
(式中、X1 ,X2 及びX3 はハロゲン原子又は低級アルキル基を示す。但し、X1 ,X2 ,X3 の少なくとも1つはハロゲン原子である。)で表されるアルミニウム化合物あるいはその会合体と、ハロゲン化四級アンモニウム塩又はハロゲン化四級ホスホニウム塩との接触の結果生じる80℃以下で液体であるイオン性を有する非水性液体組成物(以下、常温溶融塩という)の存在下、ホスゲンと反応させることを特徴とする一般式[III ]
1 −(NCO)n [III ]
(式中、R及びnは前記と同じ意味を示す。)で表されるイソシアナート類の製造方法である。
【0005】
【発明の実施の形態】
反応は、一般式[I]で表されるアミン塩酸塩を、一般式[II]で表されるアルミニウム化合物とハロゲン化四級アンモニウム塩またはハロゲン化ホスホニウム塩とにより調製された常温溶融塩を添加した有機溶媒中に懸濁させ、ホスゲンガスを吹き込むことにより行われる。ホスゲンガスの吹き込み速度は、時間あたりアミン塩酸塩1モルに対して0.1〜10モルである。反応温度は、室温から用いる有機溶媒の沸点までの温度であるが、反応速度を考慮すると還流下で行うのが望ましいが、イソシアナートによって安定性が異なるので、その安定性によって、より低い温度で反応を行うのが好ましい場合もある。
【0006】
一般式[I]で表されるアミン塩酸塩としては、どんなものでも適用可能であるが、通常の反応では反応が遅いアミノ基が2以上ある脂肪族及び芳香族ポリアミン塩酸塩化合物に適用するのに適している。具体的な化合物としては、2,6−ジアミノヘキサン酸2−アミノエチルエステル三塩酸塩、2,6−ジアミノヘキサン酸メチルエステル二塩酸塩、ペンタメチレンジアミン二塩酸塩、ヘキサメチレンジアミン二塩酸塩、2,2,4−トリメチルヘキサメチレンジアミン二塩酸塩、2,4,4−トリメチルヘキサメチレンジアミン二塩酸塩、オクタメチレンジアミン二塩酸塩、ノナメチレンジアミン二塩酸塩、m−キシリレンジアミン二塩酸塩、p−キシリレンジアミン二塩酸塩、o−キシリレンジアミン二塩酸塩、又はそれらが任意に混合されたキシリレンジアミン二塩酸塩、1,3−ビス(アミノメチル)シクロヘキサン二塩酸塩、イソホロンジアミン二塩酸塩、ビス(4−アミノシクロヘキシル)メタン二塩酸塩、2,2−ビス(4−アミノシクロヘキシル)プロパン二塩酸塩、ビス(アミノメチル)ノルボルネン二塩酸塩等の脂肪族ポリアミン塩酸塩;2,4−トリレンジアミン二塩酸塩、2,6−トリレンジアミン二塩酸塩、フェニレンジアミン二塩酸塩、4,4′−ジアミノジフェニルメタン二塩酸塩、2,4′−ジアミノジフェニルメタン二塩酸塩、1,5−ナフタレンジアミン二塩酸塩、メチレン架橋ポリフェニレンポリアミン塩酸塩等の芳香族ポリアミン塩酸塩等が例示できる。
【0007】
常温溶融塩を調製するには、一般式[II]で表されるアルミニウム化合物と、ハロゲン化四級アンモニウム塩又はハロゲン化四級ホスホニウム塩とを混合することにより行われる。アルミニウム化合物としては、塩化アルミニウム(AlCl3 )、ジクロロメチルアルミニウム(CH3 AlCl2 )、ジクロロエチルアルミニウム(C2 5 AlCl2 )、ジクロロ−n−ヘキシルアルミニウム(n−C6 13AlCl2 )、ジクロロイソブチルアルミニウム(i−C4 9 AlCl2 )、テトラクロロジメチルジアルミニウム[Al2 Cl4 (CH3 2 ]、ジブロモメチルアルミニウム(CH3 AlBr2 )、テトラブロモジメチルジアルミニウム[Al2 Br4 (CH3 2 ]等が使用できる。ハロゲン化四級アンモニウム塩としては、N−エチルピリジニウムクロリド、N−エチルピリジニウムブロミド、N−n−ブチルピリジニウムクロリド、N−n−ブチルピリジニウムブロミド、N−n−ブチルピリジニウムフルオリド、N−イソブチルピリジニウムクロリド、N−n−プロピルピリジニウムクロリド、N−n−プロピルピリジニウムヨージド、1−エチル−2−メチルピリジニウムクロリド、1−エチル−4−メチルピリジニウムクロリド、1−n−ヘキシル−2−メチルピリジニウムクロリド、1−n−ヘキシル−4−メチルピリジニウムクロリド、1−n−ブチル−4−メチルピリジニウムクロリド、1−n−ブチル−2,4−ジメチルピリジニウムクロリド等のN−アルキルピリジニウムハロゲン化物;1,3−ジメチルイミダゾリウムクロリド、1,3−ジメチルイミダゾリウムブロミド、1−メチル−3−エチルイミダゾリウムクロリド、1−メチル−3−エチルイミダゾリウムブロミド、1−メチル−3−エチルイミダゾリウムヨージド、1−メチル−3−n−ブチルイミダゾリウムクロリド、1−メチル−3−n−ブチルイミダゾリウムブロミド、1,2,3−トリメチルイミダゾリウムクロリド、1,2,3−トリメチルイミダゾリウムブロミド、1,2−ジメチル−3−エチルイミダゾリウムクロリド、1,2−ジメチル−3−エチルイミダゾリウムブロミド、1,2−ジメチル−3−n−ブチルイミダゾリウムクロリド、1,2−ジメチル−3−n−ブチルイミダゾリウムフルオリド、1,2−ジメチル−3−n−ブチルイミダゾリウムブロミド等のN,N′−ジアルキルイミダゾリウムハロゲン化物;1,3−ジメチルベンズイミダゾリウムクロリド、1,3−ジメチルベンズイミダゾリウムブロミド、1,3−ジメチルベンズイミダゾリウムヨージド、1−メチル−3−エチルベンズイミダゾリウムクロリド、1−メチル−3−エチルベンズイミダゾリウムブロミド、1−メチル−3−n−ブチルベンズイミダゾリウムクロリド、1−メチル−3−n−ブチルベンズイミダゾリウムブロミド、1−メチル−3−n−ブチルベンズイミダゾリウムフルオリド、1−エチル−3−プロピルベンズイミダゾリウムクロリド、1−エチル−3−プロピルベンズイミダゾリウムブロミド、1−エチル−3−n−ブチルベンズイミダゾリウムクロリド、1−エチル−3−n−ブチルベンズイミダゾリウムブロミド等の1,3−ジアルキルベンズイミダゾリウムハロゲン化物等が挙げられる。ハロゲン化四級ホスホニウム塩としては、テトラブチルホスホニウムクロリド、テトラブチルホスホニウムブロミド、エチルトリブチルホスホニウムクロリド等が挙げられる。
【0008】
アルミニウム化合物と四級塩のモル比は、アルミニウム化合物1モルに対し四級塩0.5〜3モルであるが、好ましくは1.0〜1.3である。
【0009】
有機溶媒に、斯くして調製された常温溶融塩を添加することによって反応媒体として供される。常温溶融塩の添加量は、多く添加すれば反応は速くなるが、経済性を考慮すれば有機溶媒1容に対し常温溶融塩0.02〜0.2容であり、通常、有機溶媒と二相系を構成する。有機溶媒としては、ホスゲンや常温溶融塩に不活性な溶媒が使用できる。好適な溶媒として、ペンタン、オクタン、デカン等の脂肪族炭化水素;トルエン、キシレン、アミルベンゼン、テトラリン等の芳香族炭化水素;クロロベンゼン、ジクロロベンゼン等のハロゲン化芳香族炭化水素等が挙げられる。その使用量は、アミン塩酸塩を懸濁させた際、充分撹拌できる量であれば特に制限はない。
【0010】
反応終了後は、一般式[III ]で表される目的化合物は有機溶媒相中に存在するので、分液により常温溶融塩を除いた後、通常の後処理を行うことにより目的物を得ることができる。
【0011】
【実施例】
次に実施例、及び、常温溶融塩を添加しない比較例を挙げ、本発明をさらに詳細に説明する。ただし本発明はこの実施例に限定されるものではない。
【0012】
実施例−1及び比較例−1
2,6−ジイソシアナトヘキサン酸メチルエステルの製造
【化3】

Figure 0004045611
2,6−ジアミノヘキサン酸メチルエステル二塩酸塩10g(42.9mmol)をm−キシレン55mlに懸濁させた。N−n−ブチルピリジニウムクロリド(55mmol%)と塩化アルミニウム(45mmol%)を混合することにより調製される常温溶融塩3mlを添加し、120℃に昇温した。ホスゲンを17g・hr-1の速度で吹き込み、さらに還流温度(127℃)まで昇温した。反応の進行をHPLCによってモニターし、溶融塩無添加のものと比較した。結果を図1に示す。
【0013】
実施例−2及び比較例−2
2,6−ジイソシアナトヘキサン酸2−イソシアナトエチルエステルの製造
【化4】
Figure 0004045611
2,6−ジアミノヘキサン酸2−アミノエチルエステル三塩酸塩29.9g(0.1mol)をm−キシレン197mlに懸濁させた。N−n−ブチルピリジニウムクロリド(55mmol%)と塩化アルミニウム(45mmol%)を混合することにより調製される溶融塩11.1gを添加し、130℃に昇温した。ホスゲンを10g・hr-1の速度で吹き込んだ。反応の進行をHPLCによってモニターし、溶融塩無添加のものと比較した。結果を図2に示す。
【0014】
実施例−3及び比較例−3
1,6−ヘキサメチレンジイソシアナートの製造
【化5】
Figure 0004045611
1,6−ヘキサメチレンジアミン二塩酸塩10g(52.9mmol)をm−キシレン55mlに懸濁させた。N−N′−ジメチルイミダゾリウムクロリド(55mmol%)と塩化アルミニウム(45mmol%)を混合することにより調製される常温溶融塩3mlを添加し、120℃に昇温した。ホスゲンを10.5g・hr-1の速度で吹き込み、さらに還流温度(127℃)まで昇温した。反応の進行をプロトンNMRによってモニターし、溶融塩無添加のものと比較した。結果を図3に示す。
【0015】
実施例−4
イソホロンジイソシアナートの製造
【化6】
Figure 0004045611
イソホロンジアミン二塩酸塩29.9g(52.9mmol)をm−キシレン55mlに懸濁させた。N−N′−ジメチルイミダゾリウムクロリド(55mmol%)と塩化アルミニウム(45mmol%)を混合することにより調製される溶融塩3mlを添加し、120℃に昇温した。ホスゲンを10.5g・hr-1の速度で吹き込み、さらに還流温度(127℃)まで昇温した。反応の進行をプロトンNMRによってモニターした。結果を図4に示す。
【0016】
【発明の効果】
本発明は、従来の方法では反応速度が遅く、工業的に優れた製造方法がなかったポリイソシアナート化合物類の製造方法として特に有用である。
【図面の簡単な説明】
【図1】実施例1及び比較例1の反応速度を示す図である。
【図2】実施例2及び比較例2の反応速度を示す図である。
【図3】実施例3及び比較例3の反応速度を示す図である。
【図4】実施例4の反応速度を示す図である。[0001]
[Industrial application fields]
The present invention relates to a method for producing an organic isocyanate compound. Organic isocyanate compounds are useful as raw materials for elastic bodies, foams, paints, adhesives, and optical plastic lenses.
[0002]
[Prior art]
Isocyanates are produced by blowing phosgene into the corresponding amine hydrochloride in an organic solvent. In particular, in the case of polyamine hydrochlorides having two or more amino groups, it is generally known that the reaction proceeds very slowly. ing. For example, in the case of hexamethylenediamine dihydrochloride, it takes 8 to 15 hours at a reaction temperature of 180 to 185 ° C. to complete the reaction (Organic Synthesis, coll. Vol. IV, 521). Therefore, it has been desired to develop an industrially superior production method that can complete the reaction in a short time under relatively mild conditions.
[0003]
[Problems to be solved by the invention]
An object of the present invention is to provide a process for producing isocyanates at a higher reaction rate than in the prior art.
[0004]
[Means for Solving the Problems]
The present inventors have found that the reaction is greatly accelerated by adding a liquid composition having a certain ionicity, and completed the present invention. That is, the present invention
Formula [I]
R 1- (NH 2 .HCl) n [I]
(Wherein R 1 represents an aliphatic or aromatic hydrocarbon group that may contain —CO 2 — or —O— in the group, and n represents an integer of 1 or more). An amine hydrochloride compound in an organic solvent represented by the general formula [II]
Al (X 1 ) (X 2 ) (X 3 ) [II]
(Wherein X 1 , X 2 and X 3 represent a halogen atom or a lower alkyl group, provided that at least one of X 1 , X 2 and X 3 is a halogen atom) or Presence of a non-aqueous liquid composition (hereinafter referred to as room temperature molten salt) having an ionic property that is liquid at 80 ° C. or lower resulting from contact between the aggregate and the quaternary ammonium halide or quaternary phosphonium salt. General formula [III] characterized by reacting with phosgene
R 1- (NCO) n [III]
(Wherein R and n have the same meaning as described above).
[0005]
DETAILED DESCRIPTION OF THE INVENTION
In the reaction, an amine hydrochloride represented by the general formula [I] is added to a room temperature molten salt prepared from an aluminum compound represented by the general formula [II] and a halogenated quaternary ammonium salt or a phosphonium halide salt. It is carried out by suspending in an organic solvent and blowing phosgene gas. The phosgene gas blowing rate is 0.1 to 10 moles per mole of amine hydrochloride per hour. The reaction temperature is a temperature from room temperature to the boiling point of the organic solvent to be used, but it is desirable to carry out the reaction under reflux in consideration of the reaction rate. However, the stability varies depending on the isocyanate, and therefore the stability varies depending on the stability. It may be preferable to carry out the reaction.
[0006]
Any amine hydrochloride represented by the general formula [I] can be applied, but it can be applied to aliphatic and aromatic polyamine hydrochloride compounds having two or more amino groups that are slow to react in a normal reaction. Suitable for Specific compounds include 2,6-diaminohexanoic acid 2-aminoethyl ester trihydrochloride, 2,6-diaminohexanoic acid methyl ester dihydrochloride, pentamethylenediamine dihydrochloride, hexamethylenediamine dihydrochloride, 2,2,4-trimethylhexamethylenediamine dihydrochloride, 2,4,4-trimethylhexamethylenediamine dihydrochloride, octamethylenediamine dihydrochloride, nonamethylenediamine dihydrochloride, m-xylylenediamine dihydrochloride , P-xylylenediamine dihydrochloride, o-xylylenediamine dihydrochloride, or xylylenediamine dihydrochloride in which they are arbitrarily mixed, 1,3-bis (aminomethyl) cyclohexane dihydrochloride, isophoronediamine Dihydrochloride, bis (4-aminocyclohexyl) methane dihydrochloride, 2,2-bis (4- Aliphatic polyamine hydrochlorides such as minocyclohexyl) propane dihydrochloride, bis (aminomethyl) norbornene dihydrochloride; 2,4-tolylenediamine dihydrochloride, 2,6-tolylenediamine dihydrochloride, phenylenediamine dihydrochloride Aromatic polyamine hydrochlorides such as hydrochloride, 4,4'-diaminodiphenylmethane dihydrochloride, 2,4'-diaminodiphenylmethane dihydrochloride, 1,5-naphthalenediamine dihydrochloride, methylene bridged polyphenylene polyamine hydrochloride, etc. It can be illustrated.
[0007]
The room temperature molten salt is prepared by mixing the aluminum compound represented by the general formula [II] with a halogenated quaternary ammonium salt or a halogenated quaternary phosphonium salt. Examples of the aluminum compound include aluminum chloride (AlCl 3 ), dichloromethyl aluminum (CH 3 AlCl 2 ), dichloroethyl aluminum (C 2 H 5 AlCl 2 ), and dichloro-n-hexyl aluminum (n—C 6 H 13 AlCl 2 ). , dichloro-isobutyl aluminum (i-C 4 H 9 AlCl 2), tetrachloro dimethyl aluminum [Al 2 Cl 4 (CH 3 ) 2], dibromomethyl aluminum (CH 3 AlBr 2), tetrabromobisphenol dimethyl aluminum [Al 2 Br 4 (CH 3 ) 2 ] or the like can be used. Examples of halogenated quaternary ammonium salts include N-ethylpyridinium chloride, N-ethylpyridinium bromide, Nn-butylpyridinium chloride, Nn-butylpyridinium bromide, Nn-butylpyridinium fluoride, N-isobutylpyridinium Chloride, Nn-propylpyridinium chloride, Nn-propylpyridinium iodide, 1-ethyl-2-methylpyridinium chloride, 1-ethyl-4-methylpyridinium chloride, 1-n-hexyl-2-methylpyridinium chloride N-alkylpyridinium halides such as 1-n-hexyl-4-methylpyridinium chloride, 1-n-butyl-4-methylpyridinium chloride, 1-n-butyl-2,4-dimethylpyridinium chloride; -Jimee Louis imidazolium chloride, 1,3-dimethylimidazolium bromide, 1-methyl-3-ethylimidazolium chloride, 1-methyl-3-ethylimidazolium bromide, 1-methyl-3-ethylimidazolium iodide, 1- Methyl-3-n-butylimidazolium chloride, 1-methyl-3-n-butylimidazolium bromide, 1,2,3-trimethylimidazolium chloride, 1,2,3-trimethylimidazolium bromide, 1,2- Dimethyl-3-ethylimidazolium chloride, 1,2-dimethyl-3-ethylimidazolium bromide, 1,2-dimethyl-3-n-butylimidazolium chloride, 1,2-dimethyl-3-n-butylimidazolium Fluoride, 1,2-dimethyl-3-n-butylimidazolium bromide N, N'-dialkylimidazolium halides such as 1,3 dimethylbenzimidazolium chloride, 1,3-dimethylbenzimidazolium bromide, 1,3-dimethylbenzimidazolium iodide, 1-methyl-3 -Ethylbenzimidazolium chloride, 1-methyl-3-ethylbenzimidazolium bromide, 1-methyl-3-n-butylbenzimidazolium chloride, 1-methyl-3-n-butylbenzimidazolium bromide, 1-methyl -3-n-butylbenzimidazolium fluoride, 1-ethyl-3-propylbenzimidazolium chloride, 1-ethyl-3-propylbenzimidazolium bromide, 1-ethyl-3-n-butylbenzimidazolium chloride, 1-ethyl-3-n-butylbenzimi Examples include 1,3-dialkylbenzimidazolium halides such as dazolium bromide. Examples of the halogenated quaternary phosphonium salt include tetrabutylphosphonium chloride, tetrabutylphosphonium bromide, ethyltributylphosphonium chloride and the like.
[0008]
The molar ratio of the aluminum compound to the quaternary salt is 0.5 to 3 mol, preferably 1.0 to 1.3, per 1 mol of the aluminum compound.
[0009]
By adding the room temperature molten salt thus prepared to the organic solvent, it is provided as a reaction medium. If the amount of the room temperature molten salt added is large, the reaction will be faster, but considering the economy, the amount of the room temperature molten salt is 0.02 to 0.2 volume with respect to 1 volume of the organic solvent. Configure the phase system. As the organic solvent, a solvent inert to phosgene or room temperature molten salt can be used. Suitable solvents include aliphatic hydrocarbons such as pentane, octane and decane; aromatic hydrocarbons such as toluene, xylene, amylbenzene and tetralin; halogenated aromatic hydrocarbons such as chlorobenzene and dichlorobenzene. The amount used is not particularly limited as long as it can be sufficiently stirred when the amine hydrochloride is suspended.
[0010]
After completion of the reaction, the target compound represented by the general formula [III] is present in the organic solvent phase. Therefore, after removing the room temperature molten salt by liquid separation, the target product can be obtained by carrying out normal post-treatment. Can do.
[0011]
【Example】
Next, an Example and the comparative example which does not add room temperature molten salt are given, and this invention is demonstrated further in detail. However, the present invention is not limited to this embodiment.
[0012]
Example-1 and Comparative Example-1
Production of 2,6-diisocyanatohexanoic acid methyl ester
Figure 0004045611
10 g (42.9 mmol) of 2,6-diaminohexanoic acid methyl ester dihydrochloride was suspended in 55 ml of m-xylene. 3 ml of room temperature molten salt prepared by mixing Nn-butylpyridinium chloride (55 mmol%) and aluminum chloride (45 mmol%) was added, and the temperature was raised to 120 ° C. Phosgene was blown in at a rate of 17 g · hr −1 , and the temperature was further raised to the reflux temperature (127 ° C.). The progress of the reaction was monitored by HPLC and compared with that without added molten salt. The results are shown in FIG.
[0013]
Example-2 and Comparative Example-2
Production of 2,6-diisocyanatohexanoic acid 2-isocyanatoethyl ester
Figure 0004045611
2,9.9 g (0.1 mol) of 2,6-diaminohexanoic acid 2-aminoethyl ester trihydrochloride was suspended in 197 ml of m-xylene. 11.1 g of a molten salt prepared by mixing Nn-butylpyridinium chloride (55 mmol%) and aluminum chloride (45 mmol%) was added, and the temperature was raised to 130 ° C. Phosgene was blown in at a rate of 10 g · hr −1 . The progress of the reaction was monitored by HPLC and compared with that without added molten salt. The results are shown in FIG.
[0014]
Example-3 and Comparative Example-3
Production of 1,6-hexamethylene diisocyanate
Figure 0004045611
10 g (52.9 mmol) of 1,6-hexamethylenediamine dihydrochloride was suspended in 55 ml of m-xylene. 3 ml of room temperature molten salt prepared by mixing NN′-dimethylimidazolium chloride (55 mmol%) and aluminum chloride (45 mmol%) was added, and the temperature was raised to 120 ° C. Phosgene was blown in at a rate of 10.5 g · hr −1 , and the temperature was further raised to the reflux temperature (127 ° C.). The progress of the reaction was monitored by proton NMR and compared to that without added molten salt. The results are shown in FIG.
[0015]
Example-4
Production of isophorone diisocyanate
Figure 0004045611
29.9 g (52.9 mmol) of isophoronediamine dihydrochloride was suspended in 55 ml of m-xylene. 3 ml of a molten salt prepared by mixing NN'-dimethylimidazolium chloride (55 mmol%) and aluminum chloride (45 mmol%) was added, and the temperature was raised to 120 ° C. Phosgene was blown in at a rate of 10.5 g · hr −1 , and the temperature was further raised to the reflux temperature (127 ° C.). The progress of the reaction was monitored by proton NMR. The results are shown in FIG.
[0016]
【The invention's effect】
The present invention is particularly useful as a method for producing polyisocyanate compounds, which has a slow reaction rate in the conventional method and has no industrially excellent production method.
[Brief description of the drawings]
1 is a graph showing reaction rates of Example 1 and Comparative Example 1. FIG.
FIG. 2 is a graph showing reaction rates of Example 2 and Comparative Example 2.
FIG. 3 is a graph showing reaction rates of Example 3 and Comparative Example 3.
4 is a graph showing the reaction rate of Example 4. FIG.

Claims (6)

一般式[I]
1 −(NH2 ・HCl)n [I]
(式中、R1 はその基の中に−CO2 −あるいは−O−を含んでいてもよい脂肪族あるいは芳香族の炭化水素基を、nは1以上の整数を示す。)で表されるアミン塩酸塩化合物を、有機溶媒中、一般式[II]
Al(X1 )(X2 )(X3 ) [II]
(式中、X1 ,X2 及びX3 はハロゲン原子又は低級アルキル基を示す。但し、X1 ,X2 ,X3 の少なくとも1つはハロゲン原子である。)で表されるアルミニウム化合物あるいはその会合体と、ハロゲン化四級アンモニウム塩又はハロゲン化四級ホスホニウム塩との接触の結果生じる80℃以下で液体であるイオン性を有する非水性液体組成物の存在下、ホスゲンと反応させることを特徴とする一般式[III ]
1 −(NCO)n [III ]
(式中、R及びnは前記と同じ意味を示す。)で表されるイソシアナート類の製造方法。
Formula [I]
R 1- (NH 2 .HCl) n [I]
(Wherein R 1 represents an aliphatic or aromatic hydrocarbon group that may contain —CO 2 — or —O— in the group, and n represents an integer of 1 or more). An amine hydrochloride compound in an organic solvent represented by the general formula [II]
Al (X 1 ) (X 2 ) (X 3 ) [II]
(Wherein X 1 , X 2 and X 3 represent a halogen atom or a lower alkyl group, provided that at least one of X 1 , X 2 and X 3 is a halogen atom) or Reacting with the phosgene in the presence of an ionic non-aqueous liquid composition that is liquid at 80 ° C. or lower resulting from contact of the aggregate with a quaternary ammonium halide or quaternary phosphonium salt. General formula [III]
R 1- (NCO) n [III]
(Wherein R and n have the same meaning as described above).
nが2又は3である請求項1記載の製造方法。The production method according to claim 1, wherein n is 2 or 3. 一般式[III ]で表されるイソシアナート類が2,6−ジイソシアナトヘキサン酸メチルエステル又は2,6−ジイソシアナトヘキサン酸2−イソシアナトエチルエチルエステルである請求項1記載の製造方法。The process according to claim 1, wherein the isocyanate represented by the general formula [III] is 2,6-diisocyanatohexanoic acid methyl ester or 2,6-diisocyanatohexanoic acid 2-isocyanatoethyl ethyl ester. . イオン性を有する非水性液体組成物がAlCl3 と一般式[IV]
Figure 0004045611
(R2 ,R3 は脂肪族あるいは芳香族の炭化水素基を、mは0,1又は2を、X4 はハロゲン原子を示す。)の接触の結果生じるものである請求項1〜3記載の製造方法。
A non-aqueous liquid composition having ionic properties and AlCl 3 and a general formula [IV]
Figure 0004045611
4. The product according to claim 1, wherein R 2 and R 3 are aliphatic or aromatic hydrocarbon groups, m is 0, 1 or 2, and X 4 is a halogen atom. Manufacturing method.
イオン性を有する非水性液体組成物がAlCl3 と一般式[V]
Figure 0004045611
(R4 ,R5 ,R6 は脂肪族あるいは芳香族の炭化水素基を、qは0,1又は2を、X5 はハロゲン原子を示す。)の接触の結果生じるものである請求項1〜3記載の製造方法。
The non-aqueous liquid composition having ionic properties is AlCl 3 and the general formula [V].
Figure 0004045611
2. R 1 , R 5 and R 6 are aliphatic or aromatic hydrocarbon groups, q is 0, 1 or 2, and X 5 is a halogen atom. The manufacturing method of -3.
有機溶媒とイオン性を有する非水性液体組成物が二相に分離した形で供される反応媒体中で反応させる請求項1〜5記載の製造方法。6. The production method according to claim 1, wherein the organic solvent and the ionic non-aqueous liquid composition are reacted in a reaction medium provided in a form separated into two phases.
JP03850697A 1996-02-29 1997-02-06 Process for producing isocyanates Expired - Fee Related JP4045611B2 (en)

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