JPH0616653A - Method for decoloring epichlorohydrin - Google Patents
Method for decoloring epichlorohydrinInfo
- Publication number
- JPH0616653A JPH0616653A JP17357292A JP17357292A JPH0616653A JP H0616653 A JPH0616653 A JP H0616653A JP 17357292 A JP17357292 A JP 17357292A JP 17357292 A JP17357292 A JP 17357292A JP H0616653 A JPH0616653 A JP H0616653A
- Authority
- JP
- Japan
- Prior art keywords
- epichlorohydrin
- hydrogen peroxide
- absorbance
- aqueous solution
- colored
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Epoxy Compounds (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は着色したエピクロロヒド
リンの脱色に関するものである。さらに詳細に述べれ
ば、工業的に製造されたエピクロロヒドリンの製品に、
または製造工程のエピクロロヒドリンに過酸化水素を添
加することにより、エピクロロヒドリンの脱色をする方
法である。FIELD OF THE INVENTION The present invention relates to the decolorization of colored epichlorohydrin. More specifically, for the industrially manufactured epichlorohydrin product,
Alternatively, it is a method of decolorizing epichlorohydrin by adding hydrogen peroxide to epichlorohydrin in the manufacturing process.
【0002】[0002]
【従来技術およびその問題点】一般に、エピクロロヒド
リンはジクロロプロピルアルコールを水酸化カルシウム
により脱塩化水素して製造さる。詳しくは、ジクロロプ
ロピルアルコール3〜6%の水溶液と石灰乳を反応器に
入れ、水蒸気によりエピクロロヒドリンをストリッピン
グする、いわゆるケン化反応器で飽和の水を含むエピク
ロロヒドリンを取出す。次いで、このようなエピクロロ
ヒドリンの精製工程では、先ず低沸蒸留塔にて水および
エピクロロヒドリンより低沸点の不純物を除去し、次の
製品蒸留塔によりエピロロヒドリンを取出す。また、製
品蒸留塔より得られるエピクロロヒドリより高沸点の不
純物は、次の蒸留塔により高沸点物中のエピクロロヒド
ンを回収する。2. Description of the Related Art Epichlorohydrin is generally produced by dehydrochlorinating dichloropropyl alcohol with calcium hydroxide. Specifically, an aqueous solution of 3 to 6% dichloropropyl alcohol and lime milk are put into a reactor, and epichlorohydrin containing saturated water is taken out in a so-called saponification reactor in which epichlorohydrin is stripped by steam. Next, in such an epichlorohydrin purification step, impurities having a lower boiling point than water and epichlorohydrin are first removed in a low boiling distillation column, and epilorohydrin is taken out in a subsequent product distillation column. For impurities having a boiling point higher than that of epichlorohydri obtained from the product distillation column, epichlorohydrone in the high-boiling substance is recovered in the next distillation column.
【0003】この際に、不純物として含まれている三塩
化プロパン等の塩素化炭化水素類が蒸留塔のリボイラー
により脱塩化水素等の反応を起こし、またエピクロロヒ
ドリンに同伴する水が不純物と反応して、工程液の着色
を起こす場合がある。それにより、製品のエピクロロヒ
ドリンまで着色し、製品規格の色度がスペックオーバー
になり、製品として取り出すこと出来ない状態になる。At this time, chlorinated hydrocarbons such as propane trichloride contained as impurities cause reactions such as dehydrochlorination by the reboiler of the distillation column, and water entrained in epichlorohydrin becomes impurities. It may react to cause coloration of the process liquid. As a result, even the epichlorohydrin of the product is colored, the chromaticity of the product standard exceeds the specifications, and the product cannot be taken out.
【0004】従来、着色したエピクロロヒドリンの脱色
法としては、例えば活性炭、活性アルミナ等による吸着
法、再び精密蒸留する蒸留法が知られている。Conventionally, as a method for decolorizing colored epichlorohydrin, an adsorption method using, for example, activated carbon or activated alumina, or a distillation method in which precision distillation is performed again is known.
【0005】しかしながら、これらの方法では新たな設
備が必要になるばかりでなく、吸着法では有機物を含む
吸着剤の再生または廃棄に環境汚染上の問題があり、ま
た蒸留法では多大のエネルギーを必要とするため、両者
とも実用的でない。However, these methods not only require new equipment, but the adsorption method has a problem of environmental pollution in regenerating or discarding the adsorbent containing an organic substance, and the distillation method requires a large amount of energy. Therefore, neither is practical.
【0006】[0006]
【問題点を解決するための手段】そこで、本発明者等は
これらの問題点を解決すべく鋭意研究した結果、過酸化
水素を着色したエピクロロヒドリンに添加することによ
り、容易に脱色出来ることを見出した。即ち、本発明
は、工業的に製造されたエピクロロヒドリンを過酸化水
素と接触させて処理することを特徴とするエピクロロヒ
ドリンの脱色方法である。[Means for Solving the Problems] Therefore, as a result of diligent studies to solve these problems, the present inventors have found that hydrogen peroxide can be easily decolorized by adding hydrogen peroxide to colored epichlorohydrin. I found that. That is, the present invention is a method for decolorizing epichlorohydrin, which comprises treating industrially produced epichlorohydrin by contacting it with hydrogen peroxide.
【0007】また、本発明においては、過酸化水素の添
加量と脱色度は比例関係にあることを見出した。Further, in the present invention, it was found that the amount of hydrogen peroxide added and the degree of decolorization are in a proportional relationship.
【0008】つまり、着色したエピクロロヒドリンの4
20nmにおける吸光度を1cmセルで測定し、次式に
より過酸化水素の水溶液を添加して、脱色するものであ
る。That is, 4 of colored epichlorohydrin
The absorbance at 20 nm is measured with a 1 cm cell, and an aqueous solution of hydrogen peroxide is added according to the following formula to decolorize.
【0009】A2 =A1 −0.32×V A1 :添加前吸光度 A2 :添加後の吸光度 V :過酸化水素100%換算の添加量(vol%) したがって、通常の製品エピクロヒドリンの場合にはA
2 を0.02以下になるように過酸化水素を添加すれば
よい。なお、過酸化水素は一般に水溶液で添加するもの
で、通常は30%程度のものが使用される。A 2 = A 1 -0.32 × V A 1 : Absorbance before addition A 2 : Absorbance after addition V: Addition amount (vol%) in terms of 100% hydrogen peroxide Therefore, in the case of ordinary product epiclohydrin For A
Hydrogen peroxide may be added so that 2 becomes 0.02 or less. Hydrogen peroxide is generally added as an aqueous solution, and about 30% is usually used.
【0010】また、本発明における過酸化水素の添加
は、工業的に製造されたエピクロロヒドリンの製品に対
してのみならず、製造工程におけるエピクロロヒドリン
に対して着色の大きい箇所、つまり低沸蒸留塔の還流液
等でもかまわない。The addition of hydrogen peroxide in the present invention is not limited to the industrially manufactured epichlorohydrin product, but also to a portion of epichlorohydrin having a large coloration in the manufacturing process, that is, The reflux liquid of the low boiling distillation column may be used.
【0011】本発明の特長として、以下のことが挙げら
れる。The features of the present invention are as follows.
【0012】1)塔、タンク等の大掛りな装置を新たに
設置する必要がない。1) It is not necessary to newly install a large-scale device such as a tower or a tank.
【0013】2)過剰の過酸化水素が微量残っても、水
に変化するのみで、他に悪影響を及ぼす不純物になるこ
とはない。2) Even if a slight amount of excess hydrogen peroxide remains, it only changes to water and does not become an impurity that adversely affects the other.
【0014】3)操作が非常に簡単である。3) The operation is very simple.
【0015】以下、本発明を実施例により具体的に説明
する。Hereinafter, the present invention will be specifically described with reference to examples.
【0016】[0016]
実施例1 1cmセルでの420nmにおける吸光度0.18のエ
ピクロロヒドリン100mlに、30%過酸化水素水溶
液2mlを添加した。添加後のエピクロロヒドリンの4
20nmの吸光度は0.01になり、溶液の着色はなく
なった。Example 1 To 100 ml of epichlorohydrin having an absorbance of 0.18 at 420 nm in a 1 cm cell, 2 ml of a 30% hydrogen peroxide aqueous solution was added. 4 of epichlorohydrin after addition
The absorbance at 20 nm was 0.01 and the solution was no longer colored.
【0017】実施例2 1cmセルでの420nmにおける吸光度0.05のエ
ピクロロヒドリン100mlに30%過酸化水素水溶液
0.3mlを添加した。添加後のエピクロロヒドリンの
420nmの吸光度は0.02になり、溶液の着色はな
くなった。Example 2 0.3 ml of a 30% aqueous hydrogen peroxide solution was added to 100 ml of epichlorohydrin having an absorbance of 0.05 at 420 nm in a 1 cm cell. After the addition, the absorbance of epichlorohydrin at 420 nm was 0.02, and the solution was no longer colored.
【0018】実施例3 1cmセルでの420nmにおける吸光度0.03のエ
ピクロロヒドリン100mlに30%過酸化水素水溶液
0.1mlを添加した。添加後のエピクロロヒドリンの
420nmの吸光度は0.02になり、溶液の着色はな
くなった。Example 3 0.1 ml of a 30% aqueous hydrogen peroxide solution was added to 100 ml of epichlorohydrin having an absorbance of 0.03 at 420 nm in a 1 cm cell. After the addition, the absorbance of epichlorohydrin at 420 nm was 0.02, and the solution was no longer colored.
【0019】実施例4 エピクロロヒドリン製造工程における低沸蒸留塔の還流
液に、過酸化水素の添加量を変えて実施した。得られた
エピクロロヒドリンについて420nmの吸光度を調査
した。Example 4 The process was carried out by changing the amount of hydrogen peroxide added to the reflux liquid of the low boiling distillation column in the epichlorohydrin production process. The absorbance at 420 nm was investigated for the obtained epichlorohydrin.
【0020】表1に示す結果が得られた。The results shown in Table 1 were obtained.
【0021】[0021]
【表1】 [Table 1]
Claims (1)
を過酸化水素と接触させて処理することを特徴とするエ
ピクロロヒドリンの脱色方法。1. A method for decolorizing epichlorohydrin, which comprises treating industrially produced epichlorohydrin by contacting it with hydrogen peroxide.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17357292A JP2823431B2 (en) | 1992-07-01 | 1992-07-01 | Epichlorohydrin decolorization method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17357292A JP2823431B2 (en) | 1992-07-01 | 1992-07-01 | Epichlorohydrin decolorization method |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0616653A true JPH0616653A (en) | 1994-01-25 |
JP2823431B2 JP2823431B2 (en) | 1998-11-11 |
Family
ID=15963049
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP17357292A Expired - Lifetime JP2823431B2 (en) | 1992-07-01 | 1992-07-01 | Epichlorohydrin decolorization method |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2823431B2 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2016175905A (en) * | 2012-01-25 | 2016-10-06 | ケーオーシーソリューションカンパニーリミテッドKoc Solution Co., Ltd. | Method for producing polythiol compound for optical material and method for producing urethane-based optical material using the same |
CN113999190A (en) * | 2021-11-19 | 2022-02-01 | 江苏瑞祥化工有限公司 | Method for decoloring microchannel continuous flow epichlorohydrin and hydrogen peroxide |
CN114105912A (en) * | 2021-11-19 | 2022-03-01 | 江苏瑞祥化工有限公司 | Method for decoloring epichlorohydrin and hydrogen peroxide |
-
1992
- 1992-07-01 JP JP17357292A patent/JP2823431B2/en not_active Expired - Lifetime
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2016175905A (en) * | 2012-01-25 | 2016-10-06 | ケーオーシーソリューションカンパニーリミテッドKoc Solution Co., Ltd. | Method for producing polythiol compound for optical material and method for producing urethane-based optical material using the same |
CN113999190A (en) * | 2021-11-19 | 2022-02-01 | 江苏瑞祥化工有限公司 | Method for decoloring microchannel continuous flow epichlorohydrin and hydrogen peroxide |
CN114105912A (en) * | 2021-11-19 | 2022-03-01 | 江苏瑞祥化工有限公司 | Method for decoloring epichlorohydrin and hydrogen peroxide |
Also Published As
Publication number | Publication date |
---|---|
JP2823431B2 (en) | 1998-11-11 |
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