发明授权
- 专利标题: Process for isolating hydroxypivalic acid from aqueous solution
- 专利标题(中): 从水溶液中分离羟基新戊酸的方法
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申请号: US906322申请日: 1997-08-05
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公开(公告)号: US5859296A公开(公告)日: 1999-01-12
- 发明人: Karl Heinz Neumann , Dieter Heitkamp , Helmut Fiege
- 申请人: Karl Heinz Neumann , Dieter Heitkamp , Helmut Fiege
- 申请人地址: DEX Leverkusen
- 专利权人: Bayer Aktiengesellschaft
- 当前专利权人: Bayer Aktiengesellschaft
- 当前专利权人地址: DEX Leverkusen
- 优先权: DEX19632924.8 19960816
- 主分类号: C07C51/285
- IPC分类号: C07C51/285 ; C07C51/43 ; C07C51/46 ; C07C59/01 ; C07C51/42
摘要:
Hydroxypivalic acid is obtained from aqueous solutions by removal of the water by azeotropic distillation and subsequent crystallization from a solvent mixture which is composed of a polar and a non-polar component. The distillation is carried out under reduced pressure and at a maximum bottom temperature of 90.degree. C., until a residual water content of at least 0.1% of the total weight of the resulting solution is achieved.
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