Method for producing diester-based material

A production method comprising:

• a step of mixing a dicarboxylic acid and a C4-10 mono-alcohol to prepare a raw material mixture;
• and
• a step of reacting the raw material mixture in the presence of a catalyst to obtain a product mixture,
• wherein the product mixture comprises a diester-based material and water,
• wherein Conditions A, B and C are applied during the step of reacting the raw material mixture in the presence of the catalyst, and
• wherein a beginning stage and an ending stage of a reaction are determined based on a reaction control point, which is a point of time at which a conversion rate of the reaction is in a range of 10% to 80%:
• Condition A:
• a temperature of a reactor in the beginning stage of the reaction is set to 150° C. to 220° C., and the temperature of the reactor in the ending stage of the reaction is set to 180° C. to 250° C., wherein the temperature of the ending stage is higher than the temperature of the beginning stage,
• Condition B:
• a portion of the raw material mixture having 40 wt % to 90 wt % of the total amount of the C4-C10 mono-alcohol is added in the beginning stage of the reaction, and a remaining portion of the raw material mixture having 10 wt % to 60 wt % of the C4-C10 mono-alcohol is added in the ending stage of the reaction,
• Condition C:
• 10 vol % to 50 vol % of the total amount of inert gas is divided and added in the beginning stage of the reaction, and 50 vol % to 90 vol % of the inert gas is added in the ending stage of the reaction based on the total input amount of the inert gas.