Abstract: The process scheme of crude distillation unit (CDU) was discussed based on the properties of a light mixed crude oil and the requirements of refinery block flow diagram (BFD), and the pre-distillation CDU process scheme with high operation pressure was proved suitable for the given mixed crude oil. The process simulation of the process scheme was carried out through Simsci PRO/II 8.2, the pre-fractionator operation pressure was optimized, the total CDU off-gas flowrate was significantly reduced and the SGP feedstock gas compressor load was cut down.

Key words: light crude oil, atmospheric distillation, process optimization, discussion