Abstract:

To meet the requirements of road-diesel national IV/V specifications in China, SINOPEC Zhenhai Refining and Chemical Company DHT-4 changed out catalyst with Criterion’s latest ULSD CENTERA DN-3636 in 2014. Catalyst performance test run was done with total feed rate of 344 tons/hr, in which SRGO, LCO and CLGO account for 68.9%, 12.9% and 18.2% separately. Product diesel S can be reduced to averaged 27 μg/g at conditions of CHPS pressure 5.3MPa, LHSV 1.74 h-1, H/O ratio 300 and R inlet T 331-332 ℃, WABT 358-359 ℃. When temperature was raised to R inlet 340.4 ℃, WABT 367.1 ℃, product diesel sulfur was less than 10 μg/g, which can meet diesel national V specifications. Performance test run showed that DN-3636 has high activities in HDS, HDN and HDAr for ULSD production. Compared to last cycle’s catalyst, SOR WABT needed for DN-3636 can be lowered down dramatically even with processing worse feed. Due to process more cracked diesel, reactor total delta T went up greatly by using DN-3636, which led to obvious energy consumption reduction.

Key words: diesel hydrogenation, DN-3636 catalyst, national Ⅳ emission standard, national Ⅴ emission standard, commercial application