| CPC C07C 67/08 (2013.01) [C07C 67/58 (2013.01); C07C 69/82 (2013.01)] | 11 Claims |
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1. A method of preparing a diester-based material, which is carried out by a continuous preparation process of a diester-based material including a reaction part in which a total of n reaction units from a first reaction unit to an nth reaction unit are connected in series, the reaction unit including a reactor which esterifies dicarboxylic acid and alcohol in the presence of a catalyst, the method comprising:
esterifying dicarboxylic acid and alcohol in a reactor of the first reaction unit to produce a reaction product, and supplying a discharge stream from a lower portion of the reactor including the reaction product to a reaction unit at a rear end,
wherein an operating pressure of the reactor of the first reaction unit is 0.4 kg/cm2G to 5.5 kg/cm2G,
an operating pressure is reduced from a reactor of any one reaction unit of reaction units from a second reaction unit to the nth reaction unit to a reactor of the nth reaction unit,
an operating temperature is increased from the reactor of the first reaction unit to the reactor of the nth reaction unit, and
wherein the dicarboxylic acid includes terephthalic acid and the alcohol includes 2-ethylhexyl alcohol and the catalyst includes organic titanium compound.
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