发明授权
US4551319A Two-stage concentration for superphosphoric acid 失效
二级浓度超级磷酸

Two-stage concentration for superphosphoric acid
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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