发明名称 |
METHOD FOR PURIFYING METHACRYLIC ACID |
摘要 |
Provided is a crystallization method by which a highly-pure methacrylic acid crystal can be produced with high productivity. The method for purifying methacrylic acid according to the present disclosure involves using crude methacrylic acid having a maleic acid concentration of 2000 ppm by mass or less and an acrylic acid concentration of 2000 ppm by mass or less and setting the slurry temperature to −10 to 10° C. in order to crystallize methacrylic acid. A suspension-type jacket-cooling-system crystallization vessel is used as the crystallization apparatus, and an absolute value of the difference between a crystallization temperature and a temperature of a cooling medium in the jacket is preferably 15° C. or less. |
申请公布号 |
US2014364646(A1) |
申请公布日期 |
2014.12.11 |
申请号 |
US201214366673 |
申请日期 |
2012.12.26 |
申请人 |
MITSUBISHI RAYON CO., LTD. |
发明人 |
Hino Tomomichi;Kato Shinpei;Sonobe Hideyuki;Hoshino Manabu |
分类号 |
C07C51/43;C07C51/44 |
主分类号 |
C07C51/43 |
代理机构 |
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代理人 |
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主权项 |
1. A method for purifying methacrylic acid, comprising:
crystallizing methacrylic acid, using crude methacrylic acid as a raw material having a maleic acid concentration of no greater than 2000 ppm by mass and an acrylic acid concentration of no greater than 2000 ppm by mass, and setting a slurry temperature at −10˜10° C. |
地址 |
TOKYO JP |