发明授权
- 专利标题: Methods for crystallization of hydroxycarboxylic acids
- 专利标题(中): 羟基羧酸结晶方法
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申请号: US11276306申请日: 2006-02-23
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公开(公告)号: US07323592B2公开(公告)日: 2008-01-29
- 发明人: Masafumi Fukae , Yoshiro Hiraishi
- 申请人: Masafumi Fukae , Yoshiro Hiraishi
- 申请人地址: JP Osaka-shi
- 专利权人: Kaneka Corporation
- 当前专利权人: Kaneka Corporation
- 当前专利权人地址: JP Osaka-shi
- 代理机构: Foley & Lardner LLP
- 优先权: JP2000-271895 20000907
- 主分类号: C07C61/12
- IPC分类号: C07C61/12
摘要:
The invention aims at producing high-purity crystals of a hydroxycarboxylic acid represented by the following formula (1): in high yield. Provided are a method for crystallization of a compound (1) which comprises acidifying a mixture of a solution of an alkali salt of the compound (1) and an organic solvent, and a method for crystallization of compound (1) by mixing a solution of the compound (1) in a water-miscible good solvent with water, in which a slurry with a necessary suspension amount of the compound (1) for inhibiting oil formation and scaling is prepared in advance and then a main crystallization is carried out in the presence of said slurry.
公开/授权文献
- US20060149098A1 METHODS FOR CRYSTALLIZATION OF HYDROXYCARBOXYLIC ACIDS 公开/授权日:2006-07-06