JP4386266B2 - Method for purifying 4,4'-bischloromethylbiphenyl - Google Patents

Method for purifying 4,4'-bischloromethylbiphenyl Download PDF

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JP4386266B2
JP4386266B2 JP2004112896A JP2004112896A JP4386266B2 JP 4386266 B2 JP4386266 B2 JP 4386266B2 JP 2004112896 A JP2004112896 A JP 2004112896A JP 2004112896 A JP2004112896 A JP 2004112896A JP 4386266 B2 JP4386266 B2 JP 4386266B2
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bischloromethylbiphenyl
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克彦 押見
高男 須永
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Nippon Kayaku Co Ltd
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本発明は、蛍光増白剤やフェノール樹脂、エポキシ樹脂原料などの合成中間体として有用な化合物である4,4’−ビスクロロメチルビフェニルの精製方法に関する。   The present invention relates to a method for purifying 4,4'-bischloromethylbiphenyl, which is a compound useful as a synthetic intermediate such as a fluorescent whitening agent, a phenol resin, or an epoxy resin raw material.

4,4’−ビスクロロメチルビフェニルの製造方法としては、(1)ビフェニルをシクロヘキサン溶媒中で塩化亜鉛の存在下にパラホルムアルデヒド及び塩化水素と反応させる方法(特許文献1参照)、(2)ビフェニルを不活性溶媒中で塩化亜鉛の存在下にホルムルデヒド重合物及び塩化チオニルと反応させる方法(特許文献2参照)、(3)ビフェニルを塩化亜鉛の存在下にホルムアルデヒド重合物及び塩素化剤と反応させるに当たり、塩素化剤として塩化水素と塩化チオニルを併用する方法(特許文献3参照)、(4)ビフェニルを塩化亜鉛の存在下にホルムアルデヒド重合物及び塩化水素と反応させるに当たり、脂肪酸無水物又は脂肪酸塩化物を添加する方法(特許文献4参照)などが知られている。   As a method for producing 4,4′-bischloromethylbiphenyl, (1) a method in which biphenyl is reacted with paraformaldehyde and hydrogen chloride in the presence of zinc chloride in a cyclohexane solvent (see Patent Document 1), (2) biphenyl Of formaldehyde and thionyl chloride in the presence of zinc chloride in an inert solvent (see Patent Document 2), (3) reaction of biphenyl with formaldehyde polymer and chlorinating agent in the presence of zinc chloride In the process, hydrogen chloride and thionyl chloride are used in combination as chlorinating agents (see Patent Document 3). (4) When biphenyl is reacted with formaldehyde polymer and hydrogen chloride in the presence of zinc chloride, fatty acid anhydride or fatty acid A method of adding a chloride (see Patent Document 4) is known.

特公昭46−29908号公報(第13頁)Japanese Examined Patent Publication No. 46-29908 (page 13) 特開平3−188029号公報(第1−4頁)Japanese Patent Laid-Open No. 3-1888029 (page 1-4) 特開平10−139699号公報(第2−3頁)JP-A-10-139699 (page 2-3) 特開平11−80047号公報(第2−4頁)JP 11-80047 (page 2-4)

4,4’−ビスクロロメチルビフェニルをフェノール樹脂やエポキシ樹脂などの樹脂原料として使用する場合、それに含まれるモノクロロメチルビフェニルやビフェニルの重合物などの不純物が樹脂の硬化挙動、すなわち反応性、耐熱性に影響を与えるために、4,4’−ビスクロロメチルビフェニルの純度が99%以上である高純度化が求められている。上記特許文献においてはシクロヘキサン単独などの単一溶媒で再結晶が行われているが、シクロヘキサン単独では化合物に対する溶剤の使用量が多すぎるため、十分に経済的ではなかった。   When 4,4'-bischloromethylbiphenyl is used as a raw material for a resin such as a phenol resin or an epoxy resin, impurities such as monochloromethylbiphenyl or a polymer of biphenyl contained in the resin cause curing behavior of the resin, that is, reactivity and heat resistance. Therefore, there is a demand for a highly purified 4,4′-bischloromethylbiphenyl having a purity of 99% or more. In the above-mentioned patent document, recrystallization is performed with a single solvent such as cyclohexane alone, but cyclohexane alone is not economical enough because the amount of the solvent used for the compound is too large.

本発明者は、前記課題を解決すべく鋭意研究を重ねた結果、特定の溶剤の組み合わせを用いることによって、溶剤使用量の多くない経済的な4,4’−ビスクロロメチルビフェニルの精製法を見いだし、本発明を完成させるに至った。   As a result of intensive studies to solve the above problems, the present inventor has developed an economical method for purifying 4,4′-bischloromethylbiphenyl which does not require a large amount of solvent by using a specific combination of solvents. As a result, the present invention has been completed.

即ち、本発明は
(1)70℃から120℃に加熱した4,4’−ビスクロロメチルビフェニル、脂肪族炭化水素及び非プロトン性極性溶剤の混合物を冷却し、生じた結晶を濾別することを特徴とする4,4’−ビスクロロメチルビフェニルの精製方法、
(2)脂肪族炭化水素が炭素数3から7のシクロアルカンである上記(1)に記載の4,4’−ビスクロロメチルビフェニルの精製方法、
(3)脂肪族炭化水素(A)と非プロトン性極性溶剤(B)の重量比(A/B)が70から2である上記(1)または(2)に記載の4,4’−ビスクロロメチルビフェニルの精製方法
に関する。
That is, the present invention is (1) cooling a mixture of 4,4′-bischloromethylbiphenyl, an aliphatic hydrocarbon and an aprotic polar solvent heated from 70 ° C. to 120 ° C., and filtering off the resulting crystals. A method for purifying 4,4′-bischloromethylbiphenyl,
(2) The method for purifying 4,4′-bischloromethylbiphenyl according to (1) above, wherein the aliphatic hydrocarbon is a cycloalkane having 3 to 7 carbon atoms,
(3) The 4,4′-bis according to (1) or (2) above, wherein the weight ratio (A / B) of the aliphatic hydrocarbon (A) to the aprotic polar solvent (B) is 70 to 2 The present invention relates to a method for purifying chloromethylbiphenyl.

本発明により、高純度の4,4’−ビスクロロメチルビフェニルを経済的に製造することが可能になる。   The present invention makes it possible to economically produce high-purity 4,4'-bischloromethylbiphenyl.

本発明に用いる4,4’−ビスクロロメチルビフェニルは上記特許文献に記載されているようにビフェニルを塩化亜鉛の存在下、塩素化剤と反応させる方法によって入手できる。これらの方法によって得られる精製前の4,4’−ビスクロロメチルビフェニルの純度は通常90%から97%(液体クロマトグラフィーによる面積%)である。   4,4'-bischloromethylbiphenyl used in the present invention can be obtained by a method of reacting biphenyl with a chlorinating agent in the presence of zinc chloride as described in the above-mentioned patent document. The purity of 4,4'-bischloromethylbiphenyl before purification obtained by these methods is usually 90% to 97% (area% by liquid chromatography).

本発明に用いる脂肪族炭化水素の具体例として、例えば、シクロプロパン、シクロブタン、シクロペンタン、シクロヘキサン、シクロヘプタンなどの炭素数3から7のシクロアルカン;n−ヘキサン、n−ヘプタン、n−オクタンなどの炭素数6から8鎖状アルカンが挙げられるが、これらに限定されるものではなく、またこれらは1種のみではなく2種以上を併用しても良い。これらのうち、炭素数3から7のシクロアルカンが好ましく、特にシクロヘキサンが工業的に入手しやすいので好ましい。   Specific examples of the aliphatic hydrocarbon used in the present invention include, for example, cycloalkanes having 3 to 7 carbon atoms such as cyclopropane, cyclobutane, cyclopentane, cyclohexane, cycloheptane; n-hexane, n-heptane, n-octane, etc. These are not limited to these, and these may be used alone or in combination of two or more. Of these, cycloalkanes having 3 to 7 carbon atoms are preferred, and cyclohexane is particularly preferred because it is easily industrially available.

本発明の精製方法において、脂肪族炭化水素の使用量は4,4’−ビスクロロメチルビフェニルに対する重量比で通常1.5から10、好ましくは1.5から6である。脂肪族炭化水素の4,4’−ビスクロロメチルビフェニルに対する重量比が1.5に満たない場合は、4,4’−ビスクロロメチルビフェニルを溶解させるために要する、4,4’−ビスクロロメチルビフェニルに対して溶解性の高い非プロトン性極性溶剤を多く使用する必要があり、収率の低下を招く恐れがある。また、脂肪族炭化水素の4,4’−ビスクロロメチルビフェニルに対する重量比が10を超える場合、溶剤を多く使用することとなり、経済的ではない。   In the purification method of the present invention, the amount of aliphatic hydrocarbon used is usually 1.5 to 10, preferably 1.5 to 6, in a weight ratio to 4,4'-bischloromethylbiphenyl. When the weight ratio of aliphatic hydrocarbons to 4,4′-bischloromethylbiphenyl is less than 1.5, 4,4′-bischloro required to dissolve 4,4′-bischloromethylbiphenyl It is necessary to use a large amount of an aprotic polar solvent that is highly soluble in methylbiphenyl, which may lead to a decrease in yield. When the weight ratio of aliphatic hydrocarbons to 4,4'-bischloromethylbiphenyl exceeds 10, a large amount of solvent is used, which is not economical.

本発明に用いる非プロトン性極性溶剤の具体例としては、ジメチルスルホキシド、N−メチルピロリドン、ジメチルイミダゾリジノン、ジメチルアセトアミド、ジメチルホルムアミド、ジオキサン、テトラヒドロフラン、グライムなどのエーテル系溶剤などが挙げられるが、これらに限定されるものではなく、またじれらの溶剤は併用しても良い。   Specific examples of the aprotic polar solvent used in the present invention include ether solvents such as dimethyl sulfoxide, N-methylpyrrolidone, dimethylimidazolidinone, dimethylacetamide, dimethylformamide, dioxane, tetrahydrofuran, and glyme. It is not limited to these, and these solvents may be used in combination.

本発明の精製方法において、非プロトン性極性溶剤の使用量は、脂肪族炭化水素(A)と非プロトン性極性溶剤(B)の重量比(A/B)として70から2が好ましい。両溶剤の使用量比が70を超える場合は、4,4’−ビスクロロメチルビフェニルを精製のために一度溶解するために必要な溶剤量が多くなるため経済的ではない。また、使用量比が2に満たない場合とは、非プロトン性極性溶剤を多く使用することを意味するものであり、精製収率の低下を招く恐れがある。   In the purification method of the present invention, the amount of the aprotic polar solvent used is preferably 70 to 2 as the weight ratio (A / B) of the aliphatic hydrocarbon (A) to the aprotic polar solvent (B). When the ratio between the two solvents exceeds 70, the amount of solvent required to dissolve 4,4'-bischloromethylbiphenyl once for purification increases, which is not economical. Moreover, the case where the usage ratio is less than 2 means that a large amount of aprotic polar solvent is used, which may cause a reduction in purification yield.

本発明の精製方法は、4,4’−ビスクロロメチルビフェニルを加温した前記の脂肪族炭化水素と非プロトン性極性溶剤との混合溶剤に溶解した後に冷却し、析出した結晶を濾別することにより行われる。4,4’−ビスクロロメチルビフェニルを溶解するときの温度は、使用する混合溶剤の沸点によるが、70℃から120℃である。また4,4’−ビスクロロメチルビフェニルを溶剤に溶解した状態で、加温、ろ過することによって異物や溶剤不溶成分を取り除くことができる。また冷却する温度は0℃から30℃が好ましい。4,4’−ビスクロロメチルビフェニルの精製前後の純度は、例えば液体クロマトグラフィーによって測定できる。   In the purification method of the present invention, 4,4′-bischloromethylbiphenyl is dissolved in the heated mixed solvent of the aliphatic hydrocarbon and the aprotic polar solvent, and then cooled, and the precipitated crystals are separated by filtration. Is done. The temperature at which 4,4'-bischloromethylbiphenyl is dissolved depends on the boiling point of the mixed solvent used, but is 70 ° C to 120 ° C. Further, foreign substances and solvent-insoluble components can be removed by heating and filtering in a state where 4,4'-bischloromethylbiphenyl is dissolved in a solvent. The cooling temperature is preferably 0 ° C to 30 ° C. The purity of 4,4'-bischloromethylbiphenyl before and after purification can be measured, for example, by liquid chromatography.

以下、本発明を実施例により更に詳細に説明するが、本発明がこれらの実施例に限定されるものではない。なお、実施例中特に断りがない限り、部は重量部を示す。また、以下に示す4,4’−ビスクロロメチルビフェニルの純度は液体クロマトグラフィー分析における純度(面積%)である。液体クロマトグラフィー分析の測定条件は以下のとおりである。   EXAMPLES Hereinafter, although an Example demonstrates this invention still in detail, this invention is not limited to these Examples. In addition, unless otherwise indicated in an Example, a part shows a weight part. The purity of 4,4'-bischloromethylbiphenyl shown below is the purity (area%) in liquid chromatography analysis. The measurement conditions for liquid chromatography analysis are as follows.

・カラム:Shodex製HPLCカラム(Inertsil ODS−2)
・カラム温度:40℃
・溶離液:アセトニトリル/水
・グラジエント条件:アセトニトリル/水=30/70(0分)
アセトニトリル/水=100/0(28分)
アセトニトリル/水=100/0(45分)
・流量:1.0ml/分
・検出:UV
Column: Shodex HPLC column (Inertsil ODS-2)
-Column temperature: 40 ° C
Eluent: acetonitrile / water Gradient condition: acetonitrile / water = 30/70 (0 minutes)
Acetonitrile / water = 100/0 (28 minutes)
Acetonitrile / water = 100/0 (45 minutes)
・ Flow rate: 1.0 ml / min ・ Detection: UV

実施例1
冷却管、温度計、攪拌機を備えた4つ口フラスコに、4,4’−ビスクロロメチルビフェニル(純度94.5%)50部、シクロヘキサン250部、ジメチルスルホキシド10部を入れ、80℃で攪拌しながら4,4’−ビスクロロメチルビフェニルを溶解した。溶解後、溶液を室温まで冷却、析出してくる結晶を濾別することによって高純度4,4’−ビスクロロメチルビフェニル(純度99.0%)を精製収率94%で得ることができた。
Example 1
In a four-necked flask equipped with a condenser, thermometer, and stirrer, 50 parts of 4,4′-bischloromethylbiphenyl (purity 94.5%), 250 parts of cyclohexane, and 10 parts of dimethyl sulfoxide are placed, and stirred at 80 ° C. While dissolving 4,4′-bischloromethylbiphenyl. After dissolution, the solution was cooled to room temperature, and the precipitated crystals were filtered off to obtain high-purity 4,4′-bischloromethylbiphenyl (purity 99.0%) with a purification yield of 94%. .

実施例2
シクロヘキサン250部をシクロヘキサン100部に、ジメチルスルホキシド10部をジメチルスルホキシド16.5部に変えたほかは、実施例1と同様に、4,4’−ビスクロロメチルビフェニルの精製を行うことによって、高純度4,4’−ビスクロロメチルビフェニル(純度99.4%)を精製収率91%で得ることができた。
Example 2
By purifying 4,4′-bischloromethylbiphenyl in the same manner as in Example 1, except that 250 parts of cyclohexane was changed to 100 parts of cyclohexane and 10 parts of dimethyl sulfoxide was changed to 16.5 parts of dimethyl sulfoxide, A purity of 4,4′-bischloromethylbiphenyl (purity 99.4%) was obtained with a purification yield of 91%.

実施例3
ジメチルスルホキシド10部をジメチルホルムアミド12.5部に変えたほかは、実施例1と同様に、4,4’−ビスクロロメチルビフェニルの精製を行うことによって、高純度4,4’−ビスクロロメチルビフェニル(純度99.4%)を精製収率91%で得ることができた。
Example 3
By purifying 4,4′-bischloromethylbiphenyl in the same manner as in Example 1 except that 10 parts of dimethyl sulfoxide was changed to 12.5 parts of dimethylformamide, high purity 4,4′-bischloromethyl was obtained. Biphenyl (purity 99.4%) could be obtained with a purification yield of 91%.

実施例4
ジメチルスルホキシド10部をジオキサン25部に変えたほかは、実施例1と同様に、4,4’−ビスクロロメチルビフェニルの精製を行うことによって、高純度4,4’−ビスクロロメチルビフェニル(純度99.5%)を精製収率91%で得ることができた。
Example 4
High purity 4,4′-bischloromethylbiphenyl (purity) was obtained by purifying 4,4′-bischloromethylbiphenyl in the same manner as in Example 1 except that 10 parts of dimethylsulfoxide was changed to 25 parts of dioxane. 99.5%) could be obtained with a purification yield of 91%.

比較例1
シクロヘキサン250部をシクロヘキサン500部に変え、ジメチルスルホキシドを混合しないほかは、実施例1と同様に、4,4’−ビスクロロメチルビフェニルの精製を行うことによって、高純度4,4’−ビスクロロメチルビフェニル(純度98.5%)を精製収率88%で得た。
Comparative Example 1
By purifying 4,4′-bischloromethylbiphenyl in the same manner as in Example 1 except that 250 parts of cyclohexane is changed to 500 parts of cyclohexane and dimethyl sulfoxide is not mixed, high purity 4,4′-bischloro is obtained. Methylbiphenyl (purity 98.5%) was obtained with a purification yield of 88%.

実施例および比較例の結果を表1に示す。   The results of Examples and Comparative Examples are shown in Table 1.

Figure 0004386266
Figure 0004386266

表1から明らかなように、精製時に脂肪族炭化水素と非プロトン性極性溶剤を併用することによって、溶剤を多く使用することなしに、高純度の4,4’−ビスクロロメチルビフェニルを高精製収率で得ることができる。   As is clear from Table 1, by using an aliphatic hydrocarbon and an aprotic polar solvent in combination during purification, high purity 4,4′-bischloromethylbiphenyl can be highly purified without using much solvent. The yield can be obtained.

Claims (3)

70℃から120℃に加熱した4,4’−ビスクロロメチルビフェニル、脂肪族炭化水素及び非プロトン性極性溶剤の混合物を冷却し、生じた結晶を濾別することを特徴とする4,4’−ビスクロロメチルビフェニルの精製方法。 4,4 ′, characterized in that a mixture of 4,4′-bischloromethylbiphenyl, aliphatic hydrocarbon and aprotic polar solvent heated from 70 ° C. to 120 ° C. is cooled and the resulting crystals are filtered off. -Purification method of bischloromethylbiphenyl. 脂肪族炭化水素が炭素数3から7のシクロアルカンである請求項1に記載の4,4’−ビスクロロメチルビフェニルの精製方法。 The method for purifying 4,4'-bischloromethylbiphenyl according to claim 1, wherein the aliphatic hydrocarbon is a cycloalkane having 3 to 7 carbon atoms. 脂肪族炭化水素(A)と非プロトン性極性溶剤(B)の重量比(A/B)が70から2である請求項1または請求項2に記載の4,4’−ビスクロロメチルビフェニルの精製方法。 The weight ratio (A / B) of the aliphatic hydrocarbon (A) and the aprotic polar solvent (B) is 70 to 2, and the 4,4'-bischloromethylbiphenyl according to claim 1 or 2, Purification method.
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