发明授权
- 专利标题: Process for producing methyl lactate
- 专利标题(中): 生产乳酸甲酯的方法
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申请号: US359414申请日: 1982-03-18
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公开(公告)号: US4500727A公开(公告)日: 1985-02-19
- 发明人: Takanori Kitamura , Mitsuo Matsumoto , Masuhiko Tamura
- 申请人: Takanori Kitamura , Mitsuo Matsumoto , Masuhiko Tamura
- 申请人地址: JPX Kurashiki
- 专利权人: Kuraray Co., Ltd.
- 当前专利权人: Kuraray Co., Ltd.
- 当前专利权人地址: JPX Kurashiki
- 优先权: JPX56-42755 19810323; JPX56-95478 19810619; JPX56-95479 19810619
- 主分类号: C07C67/03
- IPC分类号: C07C67/03 ; C07C69/14 ; C07C69/24 ; C07C69/68
摘要:
A process for producing methyl lactate by (I) hydroformylating vinyl acetate or vinyl propionate with a gaseous mixture of hydrogen and carbon monoxide in an organic solvent in the presence of a substantially water-insoluble rhodium complex and a tri-substituted phosphine to form .alpha.-acetoxy- or propionyloxy-propionaldehyde, (II) subjecting at least part of the reaction mixture obtained in step (I) to extraction with an aqueous medium to obtain an aqueous layer containing .alpha.-acetoxy- or propionyloxy-propionaldehyde and an extraction residue containing the catalyst components, and recycling the extraction residue to the hydroformylation step (I), (III) separating .alpha.-acetoxy- or propionyloxy-propionaldehyde from the aqueous layer containing the same as obtained in step (II), (IV) oxidizing .alpha.-acetoxy- or propionyloxy-propionaldehyde obtained in step (III) in the liquid phase with oxygen gas or an oxygen-containing gas in the presence of an oxidation catalyst to form .alpha.-acetoxy- or propionyloxy-propionic acid, and (V) reacting .alpha.-acetoxy- or propionyloxy-propionic acid obtained in step (IV) with methanol in the presence of an acid catalyst, and recovering the resultant methyl lactate by distillation.
公开/授权文献
- US6147005A Method of forming dual damascene structures 公开/授权日:2000-11-14
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