发明名称 |
METHOD FOR CRYSTALLIZING (METH)ACRYLIC ACID AND METHOD FOR REGULATING CONTENT OF POLYMERIZATION INHIBITOR IN (METH)ACRYLIC ACID PRODUCT |
摘要 |
<p>PROBLEM There is provided a melting method of (meth)acrylic acid crystal which is capable of providing a higher quality of (meth)acrylic acid without carrying out an additional purification treatment to (meth)acrylic acid obtained by a crystallization operation accompanied by melting of (meth)acrylic acid. In addition, there is provided a simple method for adjusting a content of polymerization inhibitor in a product (meth)acrylic acid. SOLUTION In the crystallization method melting (meth)acrylic acid crystal while wetting with the crystalline molten liquid, a polymerization inhibitor is added to a molten liquid melted after initiation of melting, and all of crystal is melted while circulating and feeding the molten liquid containing said polymerization inhibitor to the crystal. In addition, a content of polymerization inhibitor in product (meth)acrylic acid is adjusted by adding a predetermined amount of polymerization inhibitor corresponding to a product specification to the molten liquid melted after initiation of melting.</p> |
申请公布号 |
SG176607(A1) |
申请公布日期 |
2012.01.30 |
申请号 |
SG20110087582 |
申请日期 |
2010.05.27 |
申请人 |
NIPPON SHOKUBAI CO., LTD. |
发明人 |
SAKAMOTO, KAZUHIKO;UENO, KOJI;ISHII, YOSHITAKE;HIRAO, HARUNORI;NAKAGAWA, SATOSHI |
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