METHOD OF PURIFYING METHACRYLIC ACID AND METHACRYLIC ACID CRYSTAL

PROBLEM TO BE SOLVED: To provide methacrylic acid crystal with a low content of phenol.SOLUTION: A method of purifying methacrylic acid includes a step of cooling a raw material containing methacrylic acid and phenol in a crystallization tank to obtain a methacrylic acid crystal, wherein the step is...

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Bibliographic Details
Main Authors KANETANI KOJI, HINO TOMOMICHI
Format Patent
LanguageEnglish
Japanese
Published 30.08.2018
Subjects
ACYCLIC OR CARBOCYCLIC COMPOUNDS
CHEMISTRY
METALLURGY
ORGANIC CHEMISTRY
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Summary:PROBLEM TO BE SOLVED: To provide methacrylic acid crystal with a low content of phenol.SOLUTION: A method of purifying methacrylic acid includes a step of cooling a raw material containing methacrylic acid and phenol 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 0.1°C/hr or less.SELECTED DRAWING: None 【課題】フェノールの含有量が少ない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フェノール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０．１℃／ｈｒ以下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
Bibliography:Application Number: JP20170029109