Design of control structure for the process of ethyl benzene, plant wide A design method of control structure, which is based Luyben plant control wide general 9 steps. The performance of the 2.The analysis of the IAE (Integral Absolute Error) found that perturbed system by adjusting the flow rate of the new กระแสป้อน 20% found that control structure that 1 behavior response of better system structure model, 2 control1 was IAE minimum by t-test is a 1 control of 17047.11 and controls that 2 was 17067.03 the interference system to adjust the temperature of the feed stream 20% indicated that the new control structure that 2 behavior response system better control structure that 1 because control structure that 2 value. IAE minimum.1 was 67.91 and control model of 65.70 2.