Abstract：To ensure the stable operation after the project is put into operation, and provide schemes for this project technical modification and other new projects process optimization in the future, the process technology of 200 kt/a polypropylene (PP) units was analyzed. The technological characteristics of each unit in terms of process design were described, the optimized transformation schemes for the units with deficiencies in process design were proposed, and partial optimization schemes have been implemented. In catalyst unit, using white oil to configure the catalyst was suggested, because the white oil configuration catalyst feed concentration was more stable than catalyst configured with propylene, and the reactor operated more smoothly. In polymerization unit, using pure propylene as the main seal gas of the circulating gas compressor was recommended, because there was no PP powder in propylene gas, which could avoid damage of dry gas seal. In powder degassing unit, designing the operation platform and nitrogen purge for dredging the reactor discharge pipelines were suggested, and the pipelines were connected with flanges. In extrusion unit, designing the pelletizing water circulating filtration device in pelletizing water tank which could filter out PP powder in the water was suggested. According to the same type of enterprise operation experiences, when catalyst made by white oil and the main seal gas of circulating gas compressor is replaced by propylene gas, the plant operates very stably, other optimized designs can also be ensured the Huating plant operate stably.
DONG Guoliang,LIU Hongwei,KONG Aiping et al. Process Analysis and Technical Modification of Huating 200 kt/a Polypropylene[J]. 化学反应工程与工艺, 2019, 35(1): 87-96.
