Diester-based material production unit and diester-based material production system including the same

A production unit included in a continuous production system of a diester-based material, the production unit comprising:

• a reaction device including a reaction vessel in which an esterification reaction of dicarboxylic acid and a primary alcohol is performed, a raw material feed line for supplying a reactant to the reaction vessel, and a gas phase discharge line installed at an upper end of the reaction vessel such that vaporized primary alcohol and water are discharged to a column therethrough;
• the column including a column main body in which gas-liquid separation of the primary alcohol and the water introduced from the gas phase discharge line is performed, a liquid phase line installed at a lower portion of the column main body such that a liquefied alcohol-rich stream flows into the reaction device, and a gas phase line installed at an upper portion of the column main body and connected to a layer separator such that a mixture stream of a gas-phase primary alcohol and water flows out;
• a heat exchange device installed on the gas phase line of the column and recovering heat of the gas phase line;
• a condenser installed on the gas phase line of the column and installed at a rear end of the heat exchange device and liquefying a mixture of the gas-phase primary alcohol and the water in the gas phase line;
• and
• the layer separator including a separation tank in which the layer separation of a mixture of the liquefied primary alcohol and the water into an organic layer and an aqueous layer is performed, an organic layer line installed to discharge the separated organic layer to a side upper portion of the column main body, and an aqueous line through which the separated aqueous layer is discharged,
• wherein
• the heat exchange device includes one or more of
• a first heat exchanger installed to transfer heat of the gas phase line of the column to the raw material feed line;
• a second heat exchanger installed to transfer the heat of the gas phase line of the column to a line through which a low temperature stream flows in the continuous production system of a diester-based material;
• and
• a third heat exchanger installed to transfer the heat of the gas phase line of the column to condensed water generated in the continuous production system of a diester-based material.