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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