ABSTRACT
The temperature response amplitude of the different process steps was different to a great degree in the batch reactor reaction process of a good chemical company. According to the analysis of the process, the jacket needed to switch 4 kinds of hot-or-cold medium in a production cycle, for example, steam, hot water, cooling water and brine ice (calcium chloride). Different medium pressed the current medium in the jacket back to its storage tank by using compressed air before switching: this was named the jacket “empty” operation, which included air used for emptying and emergency water. 6 different mediums were connected by the jacket and these mediums were strictly prevented from mixing in the switching process of different mediums. Various mediums all had supply and return valves (Emergency water and cooling water shared the backwater and return circuit to discharge in the circulating pool). The liquid medium was good for filling the jacket when entering from low and discharging from high. The steam and compressed air entered from the upper part of the jacket and the steam condensate water discharged from the bottom of the jacket. In order to simplify the system, all kinds of liquid mediums went into
1 INTRODUCTION
In the production process of the batch reactor, the reaction temperature conditions were always changing by the reaction process. Single heating or cooling medium was difficult to meet the needs of temperature control when the reaction temperature amplitude in different stages was great, so the technical needs of the temperature was met by changing the different heating or cooling mediums in the jacket at different stages of the reaction temperature.
