Recovery Design of Benzene and Chlorobenzene from Chlorobenzene Wastewater

Chlorobenzenes (CB) are important organic chemical and industrial product, which plays a more and more important role in chemistry and production. In this paper, the process design, process simulation and optimization of chlorobenzene wastewater produced in chlorobenzene production are carried out. The recovery of benzene and chlorobenzene in chlorobenzene wastewater can improve the economic benefit to a certain extent, which provides a theoretical basis and practical significance for the actual production operation. Based on the chlorobenzene wastewater of a chemical plant, this paper introduces a variety of processes and simple process comparisons. Finally, the stripping method is used to recycle benzene and chlorobenzene. Aspen Plus software is used to simulate and optimize the process, and the best process parameters are selected. In this paper, the process was simulated, and the sensitivity of the distillation column of the benzene and chlorobenzene separation unit was analyzed. Several operating parameters were compared and optimized to achieve the best separation effect. For the Case Study, the optimal number of trays for the rectifying tower is determined to be 20, the optimal feed position is the twelfth tray, the optimal reflux ratio is 0.70, and the optimal distillation ratio is 0.75.