Reduced Time Required for Desalting

Improved Processing Efficiency with a New Separation Process

Company A, a domestic chemical manufacturer, previously used gravity separation for alumina sol desalting, but due to low processing efficiency, considered a new separation process. Asahi Kasei proposed an efficient desalting purification system using Microza® UF membrane, which shortened the time required for desalting. The results are shown in the figure below.

• Properties of the Target Liquid
  pH: 9, concentration: 6%, salt concentration: NH4Cl = 3%, viscosity: 100 mPa·s, conductivity: 40 mS/cm.
• Target conductivity
  Test solution volume: 10 L, pressure: Pi/Po = 130/70 kPa, backwash pressure: 150 kPa, backwash cycle: 20 min/20 sec, filtration temperature: 30–35°C.

Graph showing the relationship between replacement water volume, filtration flux, and conductivity in the desalination test of alumina sol (ACP-1053D) using Microza® UF membrane. Increasing the replacement water volume rapidly decreases conductivity, significantly shortening the processing time required to reach the target value (0.04 mS/cm).