Top Open Reactor/ Kettle consist of a cylindrical vertical shell with top open end with or without hinged lid on 1/3 rd opening and torospherical dish on bottom side. The Reactor/ Kettle is designed to ensure trouble free performance and the agitator shaft is coupled to the reduction gear box with flexible coupling. The Top Open Reactor/ Kettle has the feature that the reduction gear box is mounted on the top of the lantern assembly and is driven by motor using v belt pulley.