Patent ID: 7052657

Claim:
A reaction control method comprising supplying reaction components continuously into a liquid phase reaction system, subjecting continuously part of the reaction product in the reaction system to a separation step and circulating a separated liquid component that has been separated in the separation step to said reaction system, wherein the reaction system is an exothermic reaction system, and the temperature of said reaction system is controlled in accordance with the following steps: (i) detecting a flow rate and temperature of the circulated separated liquid component from said separation step, (ii) calculating a heat quantity value of the circulated separated liquid component from said separation step, based on the flow rate and temperature detected in the detecting step (i), and (iii) regulating the heat quantity of the circulated separated liquid component returned to the reaction system by means of controlling the temperature of the circulated separated liquid component based on a deviation between the heat quantity value of the circulated separated liquid component calculated in step (ii) and a predetermined reference heat quantity value serving as a reference for maintaining the temperature in the reaction system at a predetermined temperature.