A equipment for preparing aromatic dicarboxylic acid

The utility model provides an equipment for preparing aromatic dicarboxylic acid, equipment includes: A, ) with the hydrocarbon forebody catalytic oxidation among the organic solvent in order to form the product stream and to discharge gaseous oxidation panel, B, ) will come from the oxidation panel it becomes to be rich in organic solvent's the stream and the distilling period of rich aqueous steam flow to discharge gas separation, C, ) through heating up the follow it will come from in order to produce vapor to convey the first coolant liquid that flows in the cooling agent system in the rich aqueous steam flow distilling period rich aqueous steam flow condensation becomes the first condensation segment of condensate flow and steam flow, and d), the origin certainly the oxidation panel the product stream forms the thick liquid of aromatic dicarboxylic acid crystal and the crystallized region of top of the tower vapour, wherein equipment still includes: E, ) through heating up the follow the top of the tower vapour conveys the second coolant liquid and the condensation comes from the crystallized region at least, partly second condensation segment of top of the tower vapour, wherein the second coolant liquid at least some derive from first coolant liquid is and wherein the second coolant liquid is in flow in the cooling agent system, wherein the second condensation segment includes first condenser, and f), measures first condenser low reaches in the cooling agent system the measuring device of the temperature of second coolant liquid, and/or measure in the cooling agent system the measuring device of the velocity of flow of second coolant liquid.