Foam in phosphoric acid concentration (＞30% solids, ＞100°C) causes scaling in evaporators, reducing heat transfer efficiency by 40%6. A Guizhou plant using Chemi Tech KM-788 (polyether ester-stearate composite) resolved：
Heat transfer coefficient increased from 980 to 1,120 W/(m²·K)；
Evaporator cleaning cycle extended to 90 days (scale thickness ＜1mm)；
Viscosity stabilized below 120 mPa·s at 70°C.
Technology:
High-temperature resistant groups sustain ＞4 hours of activity at 110°C. Magnesium stearate adsorbs colloids (e.g., fluosilicates) to inhibit scaling and viscosity spikes.
Verification:
Added 0.25% in 42% P₂O₅ concentration system：
Steam consumption reduced 18%, saving ¥1.2 million/year in coal costs；
Vacuum stability maintained at -0.085MPa (fluctuation ＜5%)；
Residual fluorine in acid ＜50ppm.