发明授权
- 专利标题: Two-stage concentration for superphosphoric acid
- 专利标题(中): 二级浓度超级磷酸
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申请号: US637732申请日: 1984-08-06
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公开(公告)号: US4551319A公开(公告)日: 1985-11-05
- 发明人: Pierre Sanchez , Pierre Laudat
- 申请人: Pierre Sanchez , Pierre Laudat
- 申请人地址: FRX Paris
- 专利权人: CdF Chimie Azote et Fertilisants, S.A.
- 当前专利权人: CdF Chimie Azote et Fertilisants, S.A.
- 当前专利权人地址: FRX Paris
- 优先权: FRX8312952 19830805
- 主分类号: C01B25/24
- IPC分类号: C01B25/24 ; C01B25/16 ; B01D1/00
摘要:
A process for the concentration of phosphoric acid by evaporation under vacuum in two stages to produce superphosphoric acid, the pressure inside the exchanger is kept equal to or greater than 0.35 bar higher than that in the evaporator vessel.
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