Start-up and operation analysis of xylene separation unit.

The start-up and operation of 0.52 MM TPY xylene separation unit in SINOPEC Tahe petrochemical Co., Ltd. are introduced. By adding temporary process and optimizing the constant temperature operation of xylene tower in time, the xylene tower can start smoothly and safely without C₈ aromatics. The deviation between actual operation data and design data of the reformate fractionator during start-up period is analyzed, and the solution is put forward. The FHDO technology is used to remove olefins from the reformate. The operation is simple, the aromatics loss is small, and the bromine index of the mixed xylene decreases obviously. The unit has passed 100% load calibration, the yield of the mixed xylene and the energy consumption of the unit are better than the design value, and the quality of the mixed xylene meets the requirements. [ABSTRACT FROM AUTHOR]