METHOD OF PURIFYING METHACRYLIC ACID AND METHACRYLIC ACID CRYSTAL
PROBLEM TO BE SOLVED: To provide high-purity methacrylic acid crystal with a low content of acrylic acid.SOLUTION: A method of purifying methacrylic acid includes a step of cooling a raw material containing methacrylic acid and acrylic acid in a crystallization tank to obtain a methacrylic acid crys...
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| Format: | Patent |
| Sprache: | eng ; jpn |
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| Zusammenfassung: | PROBLEM TO BE SOLVED: To provide high-purity methacrylic acid crystal with a low content of acrylic acid.SOLUTION: A method of purifying methacrylic acid includes a step of cooling a raw material containing methacrylic acid and acrylic acid in a crystallization tank to obtain a methacrylic acid crystal, wherein the step is a bath-type crystallization operation, characterized by cooling the raw material at a rate of 0.4-6.0°C/hr.SELECTED DRAWING: None
【課題】アクリル酸の含有量が少ないより高純度のメタクリル酸結晶を提供する。【解決手段】メタクリル酸およびアクリル酸を含む原料を晶析槽内で冷却してメタクリル酸結晶を得る工程を含むメタクリル酸の精製方法であって、前記工程が回分式の晶析操作であり、前記原料を０．４〜６．０℃／ｈｒの速度で冷却することを特徴とするメタクリル酸の精製方法。【選択図】なし |
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