Ciba has developed a nitrite feed rate gauge system for controlling process of continuous diazotization by polar voltage method, and Hoechst has developed newly an equipment for continual coupling.

• 汽巴公司发明了用极性电压法控制连续重氮化过程中亚硝酸盐加入速度的探测系统,赫斯特公司发明了连续式偶合装置。