Abstract:

	The traditional startup method of styrene extraction unit is generally divided into reverse startup and sequential startup. The reverse startup is to prepare
styrene products in advance and fill them into the system. The sequential startup is to start up the unit with C8/C9 raw materials according
to the sequence of the process. This paper introduces the third startup method for styrene extraction unit, i.e., firstly filling mixed xylene into C8/C9 cutting tower for oil flushing, then sending the mixed xylene to extraction
system after the hot flushing with solvent, and finally sending the mixed xylene to decolorization and refining system to get through the entire process
for oil flushing. After the oil flushing with mixed xylene, the frequency of filter cleaning during normal feeding process is greatly reduced, and the risk of
styrene polymerization caused by equipment failure during startup is reduced.At the same time, the process parameters have been optimized to the best state
during the oil flushing with mixed xylene, providing favorable conditions for the production of qualified styrene products.

Key words: font-size:14px, mixed xylene；oil flushing；hot flushing with solvent；styrene')">">mixed xylene；oil flushing；hot flushing with solvent；styrene