In this study, the technical-engineering eva‎luation of the purification section of the ethylene oxide unit was performed. In general, it should be said that the purification section of ethylene oxide unit from T-410 purification tower in order to purify the input feed to it, heat exchanger E0412 as feed preheater, heat exchanger E0410 as reboiler of purification tower, heat exchanger E0413 as sidestream reboiler and heat exchanger E0411 as condenser is formed. After simulation the process with Aspen Plus simulator in different conditions and reviewing the results and comparing it with the design values, from The NRTL activity coefficient equation for the liquid phase and the Redlich-Kwong equation for the steam phase were used as thermodynamic models. In the following, in order to study the feasibility study of increasing the production capacity of the main product, the input feed to the system is increased, step by step and its effect on equipment performance and quality of Products and other characteristics were eva‎luated. In this regard, the constraints of each heat exchanger, including the output flow temperature and heat exchange capacity, were determined and applied during the project implementation process. In the following, characteristics such as quality and purity of materials in the out flows of the purification tower, temperature and pressure characteristics of the flows, characteristic of the flooding factor and the downcomer backup percent are defined as the existing constraints of the tower and with the relevant studies and eva‎luations, the maximum increase in the production capacity of the process has been obtained. By checking the maximum possible capacity values for each Heat exchanger and purification tower, condenser, was identified as the main bottleneck in the process. In general, according to feasibility studies, increasing the production capacity of the ethylene oxide purification unit and by applying the necessary conditions and constraints, without any mechanical changes in equipment, the production capacity of the main product can be increased up to 11% and only by replacing the condenser it can be increased up to 29%. On the other hand, if the system becomes operational with a 10% increase in input feed flow rate, the flow rate of the circulating fluid between the sidestream reboiler and the purification tower must be up to 70,950 kg/h, And if 26% of the feed rate is added, the optimum flow rate should increase to 80,975 kg/h thus meeting the expectations of system from the sidestream reboiler for making heat energy of purification tower.

ارجمند مهرباني

كيخسرو كريمي

محمدرضا احساني، محسن محمدي