460664 Green Application of Hydrogenation Catalyst Yn-1 on C4 Cut

Thursday, November 17, 2016: 12:30 PM
Franciscan B (Hilton San Francisco Union Square)
Zhou Du Sr., Beijing research Institute of chemical Industry, Beijing, China

Green Application of Hydrogenation Catalyst YN-1 on C4 cut

zhou Du

 Yanshan Branch of Beijing Research Institute of Chemical Industry£¬Sinopec, Beijing, China£¬102500


YN-1 Ni-based hydrogenation catalyst adopts TiO2-Al2O3 as its carrier in the shape of trilobe in cross section. It is well known that a significant synergistic interaction exists between Ni and titanium oxide, which makes the catalyst be endowed with comparatively high activity. More importantly, the catalyst can be operated at the lowest tolerable temperature due to the synergistic effect; thereby the catalyst acquires higher selectivity and minimum side reaction. Ni, as the active species, possesses superior resistance to sulfur, especially to mercaptan. The larger pores in the catalyst significantly favor diminishing the resistance in the mass transfer process during the hydrogenation reaction. Its physical property is illustrated in Table 1.

Table 1    Physical property of YN-1 hydrogenation catalyst






Trilobe  Extrudate


4-7 mm

Bulk density

0.6-0.8 g/ml

Crushing strength:

>18 N/mm

Active component


The YN-1 Ni-based catalyst is suitable for selective hydrogenation of diverse distillation cuts (C4 ¨C C10) of pyrolysis gasoline containing high content of impurities such as sulfur, arsenic and nitrogen. In this paper, its green application in hydrotreating C4 cut will be discussed.

YN-1 catalyst has been successfully commercialized in 40Kton/a Butadiene Tail gas Hydrogenation unit in Maoming division of Sinopec, China in July, 2015. This is the first industrial application which turns the C4 tail gas from Butadiene Extraction unit into ethylene cracking feedstock in China. The tail gas full of C4 olefins£¨like butadiene£© and alkynes(like ethyl acetylene and vinyl acetylene) once was sent to torch to be lighted as waste gas. With the development of our new C4 hydrotreating technology, it¡¯s now mixed with toluene and sent into hydrogenation reactor to undergo hydrogenation reaction. After that, the olefins in it are fully saturated and are then introduced to ethylene cracking unit after toluene separation. The schematic of C4 cut hydrogenation technology is shown in Figure1. The hydrogenation product which is rich in butane produces 13 wt% more ethylene than ordinary cracking feed like naphtha, which in turn promote the ethylene production and protect environment.

Figure1  The schematic of C4 cut hydrogenation technology

After successful start up under room temperature in the plant, the hydrogenation product¡¯s olefin content (including alkynes) is controlled bellow 0.3wt%, while that of feed is about 40wt%, indicating that YN-1 catalyst exerts excellent activity under low temperature on C4 cut saturation.

Key words:

  green application; hydrogenation; tail gas; ethylene production ; C4 cut

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