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JP4379968B2 - Method for producing binuclear dimethylol compound - Google Patents
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JP4379968B2 - Method for producing binuclear dimethylol compound - Google Patents

Method for producing binuclear dimethylol compound Download PDF

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Publication number
JP4379968B2
JP4379968B2 JP25156099A JP25156099A JP4379968B2 JP 4379968 B2 JP4379968 B2 JP 4379968B2 JP 25156099 A JP25156099 A JP 25156099A JP 25156099 A JP25156099 A JP 25156099A JP 4379968 B2 JP4379968 B2 JP 4379968B2
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Prior art keywords
parts
xylenol
reaction
acid
mol
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JP2001072632A (en
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召 高橋
文治 槻瀬
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Sumitomo Chemical Co Ltd
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Sumitomo Chemical 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】
【発明の属する技術分野】
本発明は、2核体ジメチロール化合物の製造方法に関し、より詳しくは2,5−キシレノールの2核体ジメチロール化合物の製造方法に関するものである。
【0002】
【従来の技術】
2,5−キシレノールの2核体ジメチロール化合物の製造方法としては、例えば、2,5−キシレノールに対して2〜6モル倍のホルムアルデヒド及び0.1〜0.5モル倍の塩基性触媒を用い、該塩基性触媒に対して2〜12重量倍の水の存在下に、25〜60℃の範囲で、かつ反応中に有機溶媒を加えて反応させる方法が公知である。(特開平9−110756号公報を参照)
【0003】
【発明が解決しようとする課題】
しかしながら、上記公知の方法では、反応の選択率等が十分ではなく、沈殿した生成2核体ジメチロール化合物をそのまま濾過、洗浄した場合の乾燥品の純度が60〜65%程度で、事実上、酢酸エチル等の良溶媒を用いて精製する必要があった。また、上記公知の方法では、反応中に有機溶媒を加えて反応マスの流動性を改良する必要があり、さらには、反応温度や有機溶媒を添加するタイミング等のバラツキによって、反応マスの流動性が悪化するなどの問題点があった。
【0004】
【課題を解決するための手段】
本発明者らは上記問題点を解決すべく鋭意検討した結果、先ず、2,5−キシレノールとホルムアルデヒドとを比較的低温で反応させて1核体のジメチロール化合物とし、次いで、該反応マスを、塩基性触媒量を低減させた状態下に比較的高温で反応させると、2核体のジメチロール化合物の生成率(反応の選択率)が大幅に向上することを見出し、さらに、前記した反応系に有機酸または鉱酸のアルカリ金属またはアルカリ土類金属の塩を加えると、反応マスの流動性が飛躍的に改良されることを見出して、本発明を完成するに至った。
【0005】
すなわち、本発明は、原料化合物としての2,5−キシレノールとホルムアルデヒドとを、塩基性触媒および水の存在下に反応させて、下記式(I)
【0006】
【化2】

Figure 0004379968
(I)
【0007】
で示される2核体ジメチロール化合物を製造する方法であって、(a)有機酸または鉱酸のアルカリ金属またはアルカリ土類金属の塩、および、塩基性触媒を、2,5−キシレノールに対して、各々、0.25〜1.5倍(重量/重量)および0.5〜1倍(モル/モル)使用し、前記原料化合物を比較的低温で反応させる工程、(b)次いで、(a)工程で得た反応混合物中の塩基性触媒の量が上記反応開始時の2,5−キシレノール量に対して0.05〜0.15倍(モル/モル)になるように有機酸または鉱酸を加える工程、(c)次に、(b)工程で得た混合物を比較的高温で反応させる工程からなることを特徴とする2核体ジメチロール化合物の製造方法を提供するものである。
以下、本発明を詳細に説明する。
【0008】
【発明の実施の形態】
原料化合物としての2,5−キシレノールとホルムアルデヒドとを、塩基性触媒及び水の存在下に反応させて、前記式(I)で示される2核体ジメチロール化合物を製造する本発明の方法において、水の使用量は2,5−キシレノールに対して1.5〜2.5重量倍であることが好ましい。
ホルムアルデヒドとしては、例えばホルマリン、パラホルムアルデヒド、ポリオキシメチレン等があげられるが、ホルマリンが好ましい。
塩基性触媒としては、例えば水酸化ナトリウム、水酸化カリウム、炭酸ナトリウム、炭酸カリウム等のアルカリ金属水酸化物やアルカリ金属炭酸塩が例示されるが、該塩基性触媒の量が、上記反応開始時の2,5−キシレノール量に対して0.05〜0.15倍(モル/モル)になるように有機酸または鉱酸を加えて調整する(b)工程等における操作性の観点から、発泡しないアルカリ金属水酸化物を用いることがより好ましい。
【0009】
前記(a)工程では、有機酸又は鉱酸のアルカリ金属又はアルカリ土類金属の塩を2,5−キシレノールに対して0.25〜1.5倍(重量/重量)用い、且つ、塩基性触媒を2,5−キシレノールに対して0.5〜1倍(モル/モル)用いて、前記原料化合物を比較的低温で反応させるものであるが、有機酸または鉱酸のアルカリ金属またはアルカリ土類金属の塩としては、例えば、塩化ナトリウム、塩化カリウム、硫酸ナトリウム、酢酸ナトリウム、シュウ酸ナトリウム等が好ましい。これらの塩の使用量は、好ましくは、2,5−キシレノールに対して0.5〜1倍(重量/重量)である。
工程(a)の反応は、有機酸または鉱酸のアルカリ金属またはアルカリ土類金属の塩と塩基性触媒とが存在する2,5−キシレノールと水の混合物中に、ホルムアルデヒドを添加しながら行うことが好ましい。また、2,5−キシレノールとホルムアルデヒドのモル比は、1:3〜1:5の範囲が好ましく、1:3.5〜1:4.5の範囲がより好ましい。このときの反応温度は、15〜30℃の範囲が好ましく、20〜25℃の範囲がより好ましい。反応時間は4〜7時間の範囲が好ましい。
【0010】
このようにして、1核体のジメチロール化合物が生成されるが、前記(b)工程では、(a)工程で得た反応混合物中の塩基性触媒の量が、上記反応開始時の2,5−キシレノール量に対して、0.05〜0.15倍(モル/モル)になるように有機酸または鉱酸を加えて調整するものである。有機酸又は鉱酸としては、例えば硫酸、塩酸、酢酸、シュウ酸等があげられる。
(c)工程は(b)工程で得た混合物を比較的高温で反応させるものであるが、反応温度としては、好ましくは40〜60℃であり、より好ましくは50〜55℃である。
また、反応時間は、好ましくは約3〜10時間の範囲である。
【0011】
前記(c)工程の反応終了後、例えば、残存した塩基性触媒を酢酸、硫酸または塩酸等の有機酸又は鉱酸で中和後、反応マスを濾過し、得られた結晶を水洗することにより、2核体ジメチロール化合物を取り出すことができる。
【0012】
このようにして、反応における選択率の向上に基いて、実用上十分な純度を有する2核体ジメチロール化合物が得られ、更に精製する必要の無い該化合物は、例えば、脱水縮合反応等の原料化合物として有用である。
【0013】
【実施例】
次に実施例を挙げて、本発明を更に具体的に説明するが、本発明はこれらによって限定されるものではない。例中の「%」または「部」は、特記ない限り、重量%または重量部である。
【0014】
実施例1
水1000部中に塩化ナトリウム300部及び苛性カリ150部を加えて混合する。得られた液の中に2,5−キシレノール510部を仕込み、次いで、20〜23℃にて37%ホルマリン1360部を1時間かけて滴下し、滴下終了後、同温度で5時間攪拌した。
次に、反応混合物中に50%硫酸235部を常温で15〜30分かけて添加し、添加終了後、50℃に昇温し、同温度で8時間攪拌した。
得られた反応混合物を90%酢酸20部で中和した後、30℃まで冷却し、濾過後、水洗して、湿潤ケーキを得た。得られた湿潤ケーキを乾燥して、純度72%(液体クロマトグラムによる分析値)の4,4‘−メチレンビス(2−ヒドロキシメチル−3,6−ジメチルフェノール)698部を収率76%で得た。
【0015】
実施例2
水1000部中に硫酸ナトリウム300部、28%苛性ソーダ液350部を加えて混合する。得られた液の中に2,5−キシレノール510部を加え、18〜20℃にて37%ホルマリン1200部を1時間かけて滴下し、滴下終了後、同温度で5時間攪拌した。次いで、反応混合物中に50%硫酸225部を15〜30分かけて加えた後、50℃まで昇温し、同温度で8時間攪拌した。90%酢酸を用いて、反応マスを弱酸性まで中和後、30℃まで冷却し、濾過後、水洗してケーキを得た。得られたケーキを乾燥することにより、純度72%(液体クロマトグラムによる分析値)の4,4‘−メチレンビス(2−ヒドロキシメチル−3,6−ジメチルフェノール)700部を収率76%で得た。
【0016】
実施例3
水1000部中に塩化ナトリウム250部及び28%苛性ソーダ液600部を加えて混合した。得られた液の中に2,5−キシレノール510部を加え、16〜18℃にて37%ホルマリン1360部を1時間かけて滴下し、滴下終了後、同温度で7時間攪拌した。
次いで、反応混合物中に35%塩酸395部を15〜30分で添加後、55℃に昇温し、同温度で5時間攪拌した。
反応マスを90%酢酸を用いて弱酸性に中和した後、30℃まで冷却し、濾過後、水洗してケーキを得た。得られたケーキを乾燥することにより、純度70%(液体クロマトグラムによる分析値)の4,4‘−メチレンビス(2−ヒドロキシメチル−3,6−ジメチルフェノール)701部を収率74%で得た。
【0017】
実施例4
水1500部中に塩化カリウム500部及び苛性カリ150部を加えて混合する。得られた液の中に2,5−キシレノール510部を加え、37%ホルマリン1360部を27〜30℃にて1時間かけて滴下し、滴下終了後、同温度で4時間攪拌した。反応混合物中に酢酸125部を15〜30分かけて加えた後、40℃に昇温し、同温度で8時間攪拌した。
90%酢酸で弱酸性に中和した後、30℃まで冷却し、濾過、水洗後、ケーキを得た。得られたケーキを乾燥することにより、純度71%(液体クロマトグラムによる分析値)の4,4‘−メチレンビス(2−ヒドロキシメチル−3,6−ジメチルフェノール)695部を収率74%で得た。
【0018】
実施例5
水1500部中に塩化カリウム300部及び炭酸カリウム300部を加えて混合した。得られた液の中に2,5−キシレノール510部を加え、37%ホルマリン1360部を20〜23℃にて1時間かけて滴下し、滴下終了後、同温度で5時間攪拌した。反応混合物中に50%硫酸175部を15〜30分で加えた後、60℃に昇温し、同温度で4時間攪拌した。
反応マスを90%酢酸で弱酸性に中和した後、30℃まで冷却し、濾過、水洗してケーキを得た。得られたケーキを乾燥することにより、純度69%(液体クロマトグラムによる分析値)の4,4‘−メチレンビス(2−ヒドロキシメチル−3,6−ジメチルフェノール)701部を収率73%で得た。
【0019】
実施例6
水1000部中に酢酸ナトリウム300部及び苛性カリ150部を加え、以下、実施例1と同様に操作した。純度71%の4,4‘−メチレンビス(2−ヒドロキシメチル−3,6−ジメチルフェノール)701部を収率75%で得た。
【0020】
【発明の効果】
本発明の方法によれば、高純度の2核体ジメチロール化合物を、有機溶媒を使用することなく、工業的有利に製造することができる。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for producing a binuclear dimethylol compound, and more particularly to a method for producing a 2,5-xylenol dinuclear dimethylol compound.
[0002]
[Prior art]
As a manufacturing method of the binuclear dimethylol compound of 2,5-xylenol, for example, 2-6 mol times formaldehyde and 0.1-0.5 mol times basic catalyst are used with respect to 2,5-xylenol. A method is known in which an organic solvent is added and reacted in the range of 25 to 60 ° C. in the presence of 2 to 12 times by weight of water relative to the basic catalyst. (See JP-A-9-110756)
[0003]
[Problems to be solved by the invention]
However, in the above-mentioned known methods, the selectivity of the reaction is not sufficient, and the purity of the dried product when the precipitated dinucleol dimethylol compound precipitated is filtered and washed as it is is about 60 to 65%. It was necessary to purify using a good solvent such as ethyl. Further, in the above known method, it is necessary to improve the fluidity of the reaction mass by adding an organic solvent during the reaction, and furthermore, the fluidity of the reaction mass due to variations in the reaction temperature and timing of adding the organic solvent. There were problems such as worsening.
[0004]
[Means for Solving the Problems]
As a result of intensive studies to solve the above problems, the present inventors first reacted 2,5-xylenol and formaldehyde at a relatively low temperature to form a mononuclear dimethylol compound, and then the reaction mass was It has been found that when the reaction is carried out at a relatively high temperature in a state where the amount of the basic catalyst is reduced, the production rate (reaction selectivity) of the binuclear dimethylol compound is greatly improved. It has been found that the addition of an alkali metal or alkaline earth metal salt of an organic acid or mineral acid dramatically improves the fluidity of the reaction mass, leading to the completion of the present invention.
[0005]
That is, in the present invention, 2,5-xylenol as a raw material compound and formaldehyde are reacted in the presence of a basic catalyst and water, and the following formula (I)
[0006]
[Chemical formula 2]
Figure 0004379968
(I)
[0007]
A method for producing a binuclear dimethylol compound represented by the formula: (a) an alkali metal or alkaline earth metal salt of an organic acid or mineral acid, and a basic catalyst for 2,5-xylenol Using 0.25 to 1.5 times (weight / weight) and 0.5 to 1 times (mol / mol), respectively, and reacting the raw material compound at a relatively low temperature, (b) and (a ) Organic acid or mineral so that the amount of the basic catalyst in the reaction mixture obtained in the step is 0.05 to 0.15 times (mol / mol) with respect to the amount of 2,5-xylenol at the start of the reaction. The present invention provides a method for producing a binuclear dimethylol compound characterized by comprising a step of adding an acid, and (c) a step of reacting the mixture obtained in the step (b) at a relatively high temperature.
Hereinafter, the present invention will be described in detail.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
In the method of the present invention for producing a binuclear dimethylol compound represented by the formula (I) by reacting 2,5-xylenol as a raw material compound with formaldehyde in the presence of a basic catalyst and water, Is preferably 1.5 to 2.5 times by weight of 2,5-xylenol.
Examples of formaldehyde include formalin, paraformaldehyde, polyoxymethylene and the like, with formalin being preferred.
Examples of the basic catalyst include alkali metal hydroxides and alkali metal carbonates such as sodium hydroxide, potassium hydroxide, sodium carbonate, and potassium carbonate. The amount of the basic catalyst is determined at the start of the reaction. From the viewpoint of operability in the step (b) for adjusting by adding an organic acid or a mineral acid so as to be 0.05 to 0.15 times (mole / mole) relative to the amount of 2,5-xylenol, alkali metal water that does not foam It is more preferable to use an oxide.
[0009]
In the step (a), an alkali metal or alkaline earth metal salt of an organic acid or mineral acid is used 0.25 to 1.5 times (weight / weight) with respect to 2,5-xylenol, and is basic. The catalyst is used 0.5 to 1 times (mol / mol) with respect to 2,5-xylenol, and the raw material compound is reacted at a relatively low temperature. Preferred examples of the metal salt include sodium chloride, potassium chloride, sodium sulfate, sodium acetate, and sodium oxalate. The amount of these salts used is preferably 0.5-1 times (weight / weight) with respect to 2,5-xylenol.
The reaction of the step (a) is performed while adding formaldehyde to a mixture of 2,5-xylenol and water in which an alkali metal or alkaline earth metal salt of an organic acid or mineral acid and a basic catalyst are present. Is preferred. The molar ratio of 2,5-xylenol to formaldehyde is preferably in the range of 1: 3 to 1: 5, and more preferably in the range of 1: 3.5 to 1: 4.5. The reaction temperature at this time is preferably in the range of 15 to 30 ° C, and more preferably in the range of 20 to 25 ° C. The reaction time is preferably in the range of 4 to 7 hours.
[0010]
In this way, a mononuclear dimethylol compound is produced. In the step (b), the amount of the basic catalyst in the reaction mixture obtained in the step (a) is 2 to 5 at the start of the reaction. -It adjusts by adding an organic acid or a mineral acid so that it may become 0.05-0.15 times (mol / mol) with respect to the amount of xylenol. Examples of the organic acid or mineral acid include sulfuric acid, hydrochloric acid, acetic acid, oxalic acid and the like.
In step (c), the mixture obtained in step (b) is reacted at a relatively high temperature. The reaction temperature is preferably 40 to 60 ° C, more preferably 50 to 55 ° C.
The reaction time is preferably in the range of about 3 to 10 hours.
[0011]
After completion of the reaction in the step (c), for example, after neutralizing the remaining basic catalyst with an organic acid or mineral acid such as acetic acid, sulfuric acid or hydrochloric acid, the reaction mass is filtered, and the resulting crystals are washed with water. A binuclear dimethylol compound can be removed.
[0012]
In this way, a binuclear dimethylol compound having practically sufficient purity is obtained on the basis of the improvement in selectivity in the reaction, and the compound that does not need to be further purified is, for example, a raw material compound such as a dehydration condensation reaction. Useful as.
[0013]
【Example】
EXAMPLES Next, although an Example is given and this invention is demonstrated more concretely, this invention is not limited by these. In the examples, “%” or “part” is “% by weight” or “part by weight” unless otherwise specified.
[0014]
Example 1
Add 1000 parts of sodium chloride and 150 parts of caustic potash to 1000 parts of water and mix. To the obtained liquid, 510 parts of 2,5-xylenol was charged, and then 1360 parts of 37% formalin was added dropwise at 20 to 23 ° C. over 1 hour. After completion of the addition, the mixture was stirred at the same temperature for 5 hours.
Next, 235 parts of 50% sulfuric acid was added to the reaction mixture at room temperature over 15 to 30 minutes, and after the addition was completed, the temperature was raised to 50 ° C. and stirred at the same temperature for 8 hours.
The obtained reaction mixture was neutralized with 20 parts of 90% acetic acid, cooled to 30 ° C., filtered and washed with water to obtain a wet cake. The obtained wet cake was dried to obtain 698 parts of 4,4′-methylenebis (2-hydroxymethyl-3,6-dimethylphenol) having a purity of 72% (analyzed by liquid chromatogram) in a yield of 76%. It was.
[0015]
Example 2
In 1000 parts of water, 300 parts of sodium sulfate and 350 parts of 28% sodium hydroxide solution are added and mixed. To the obtained liquid, 510 parts of 2,5-xylenol was added, and 1200 parts of 37% formalin was added dropwise at 18 to 20 ° C. over 1 hour, followed by stirring at the same temperature for 5 hours. Next, 225 parts of 50% sulfuric acid was added to the reaction mixture over 15 to 30 minutes, and then the temperature was raised to 50 ° C. and stirred at the same temperature for 8 hours. The reaction mass was neutralized to weak acidity using 90% acetic acid, cooled to 30 ° C., filtered and washed with water to obtain a cake. The obtained cake was dried to obtain 700 parts of 4,4′-methylenebis (2-hydroxymethyl-3,6-dimethylphenol) having a purity of 72% (analyzed value by liquid chromatogram) in a yield of 76%. It was.
[0016]
Example 3
In 1000 parts of water, 250 parts of sodium chloride and 600 parts of 28% sodium hydroxide solution were added and mixed. To the obtained liquid, 510 parts of 2,5-xylenol was added, and 1360 parts of 37% formalin was added dropwise at 16-18 ° C. over 1 hour. After completion of the addition, the mixture was stirred at the same temperature for 7 hours.
Subsequently, 395 parts of 35% hydrochloric acid was added to the reaction mixture in 15 to 30 minutes, and then the temperature was raised to 55 ° C. and stirred at the same temperature for 5 hours.
The reaction mass was neutralized with 90% acetic acid to weak acidity, cooled to 30 ° C., filtered and washed with water to obtain a cake. By drying the obtained cake, 701 parts of 4,4′-methylenebis (2-hydroxymethyl-3,6-dimethylphenol) having a purity of 70% (analytical value by liquid chromatogram) was obtained in a yield of 74%. It was.
[0017]
Example 4
In 500 parts of water, 500 parts of potassium chloride and 150 parts of caustic potash are added and mixed. To the obtained liquid, 510 parts of 2,5-xylenol was added, and 1360 parts of 37% formalin was added dropwise at 27 to 30 ° C. over 1 hour. After completion of the addition, the mixture was stirred at the same temperature for 4 hours. After adding 125 parts of acetic acid to the reaction mixture over 15 to 30 minutes, the temperature was raised to 40 ° C. and stirred at the same temperature for 8 hours.
After neutralizing with 90% acetic acid to weak acidity, it was cooled to 30 ° C., filtered and washed with water to obtain a cake. By drying the obtained cake, 695 parts of 4,4′-methylenebis (2-hydroxymethyl-3,6-dimethylphenol) having a purity of 71% (analytical value by liquid chromatogram) was obtained in a yield of 74%. It was.
[0018]
Example 5
To 1500 parts of water, 300 parts of potassium chloride and 300 parts of potassium carbonate were added and mixed. To the obtained liquid, 510 parts of 2,5-xylenol was added, and 1360 parts of 37% formalin was added dropwise at 20-23 ° C. over 1 hour. After completion of the addition, the mixture was stirred at the same temperature for 5 hours. After adding 175 parts of 50% sulfuric acid to the reaction mixture in 15 to 30 minutes, the temperature was raised to 60 ° C., and the mixture was stirred at the same temperature for 4 hours.
The reaction mass was neutralized with 90% acetic acid to weak acidity, then cooled to 30 ° C., filtered and washed with water to obtain a cake. By drying the obtained cake, 701 parts of 4,4′-methylenebis (2-hydroxymethyl-3,6-dimethylphenol) having a purity of 69% (analyzed by liquid chromatogram) was obtained in a yield of 73%. It was.
[0019]
Example 6
300 parts of sodium acetate and 150 parts of caustic potash were added to 1000 parts of water, and the same operation as in Example 1 was performed. 701 parts of 4,4′-methylenebis (2-hydroxymethyl-3,6-dimethylphenol) having a purity of 71% were obtained in a yield of 75%.
[0020]
【The invention's effect】
According to the method of the present invention, a high-purity dinuclear dimethylol compound can be produced industrially advantageously without using an organic solvent.

Claims (3)

原料化合物としての2,5−キシレノールとホルムアルデヒドとを、塩基性触媒および水の存在下に反応させて、下記式(I)
Figure 0004379968
(I)
で示される2核体ジメチロール化合物を製造する方法であって、(a)有機酸または鉱酸のアルカリ金属またはアルカリ土類金属の塩、及び、塩基性触媒を、2,5−キシレノールに対して、各々、0.25〜1.5倍(重量/重量)、及び、0.5〜1倍(モル/モル)使用し、前記原料化合物を15〜30℃で反応させる工程、(b)次いで、(a)工程で得た反応混合物中の塩基性触媒の量が上記反応開始時の2,5−キシレノール量に対して0.05〜0.15倍(モル/モル)になるように有機酸または鉱酸を加える工程、(c)次に、(b)工程で得た混合物を40〜60℃で反応させる工程からなることを特徴とする2核体ジメチロール化合物の製造方法。
By reacting 2,5-xylenol as a raw material compound with formaldehyde in the presence of a basic catalyst and water, the following formula (I)
Figure 0004379968
(I)
A binuclear dimethylol compound represented by formula (a): an alkali metal or alkaline earth metal salt of an organic acid or mineral acid, and a basic catalyst for 2,5-xylenol Using 0.25 to 1.5 times (weight / weight) and 0.5 to 1 times (mol / mol), respectively, and reacting the raw material compounds at 15 to 30 ° C. , (b) The organic catalyst is organic so that the amount of the basic catalyst in the reaction mixture obtained in the step (a) is 0.05 to 0.15 times (mol / mol) with respect to the amount of 2,5-xylenol at the start of the reaction. A method for producing a binuclear dimethylol compound, comprising a step of adding an acid or a mineral acid, (c) and a step of reacting the mixture obtained in the step (b) at 40 to 60 ° C.
(a)工程の反応時間4〜7時間である請求項1記載の方法。(A) the reaction time of Step The method of claim 1 wherein the 4 to 7 hours. 有機酸または鉱酸のアルカリ金属またはアルカリ土類金属の塩が、塩化ナトリウム、塩化カリウム、硫酸ナトリウムまたは酢酸ナトリウムである請求項1又は2記載の方法。The method according to claim 1 or 2, wherein the alkali metal or alkaline earth metal salt of the organic acid or mineral acid is sodium chloride, potassium chloride, sodium sulfate or sodium acetate.
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