关键词: MIP 汽油 硫化物 烯烃 氢转移

Abstract: Data of sulfur contents of naphtha from running MIP units were collected and analyzed in this paper. The statistical data showed that sulfur transfer coefficient (STC) based on similar naphtha dry point could accurately and efficiently evaluate the effect of naphtha desulfurization by various catalytic cracking technologies. Based on the similar naphtha dry points, the STC of MIP series processes was in the range of 4.91%～7.30%, which was 30～50% lowered as compared with that of conventional FCC process (with a STC of 10%). When the dry point of naphtha was below 185℃, the STC of MIP-CGP process was 3.93%, while those of FDFCC-III process and ARGG process were 6.27% and 10.6%, respectively. When the dry point of gasoline was above 190℃, the STC of MIP-CGP process was 5.60% while that of DCC process was 19.10%. The reasons of having lower naphtha sulfur content with MIP technology were discussed as well. It could be attributed mainly to the following two aspects: firstly, the strong hydrogen transfer reaction trend in the second reaction zone of MIP process might cause the transformation of sulfides into benzothiophene and H2S left naphtha fraction; secondly, the lower olefin content of MIP naphtha might suppress the formation of sulfides.

Key words: gasoline stock, sulfide, olefin, hydrogen transfer