An
important impact of shale gas on the chemical industry is the
production of value-added chemicals from natural gas liquids (NGLs,
C2H6, C3H8, C4H10, C5+). In this paper, three novel process
designs are proposed for integrating shale gas processing with ethylene
production. The unique feature of the proposed process designs is
the coprocessing of shale gas and ethane cracking gas. On the basis
of detailed process modeling and simulation, we develop detailed thermo-economic
models and exergy analysis for the process designs. The results show
that the proposed process designs using NGLs-rich shale gas have an
adverse impact on both the overall exergy efficiency and total capital
cost when compared with that of conventional shale gas processing
design. However, technology integration and better quality of raw
shale gas can significantly increase the profitability of the proposed
process designs. The estimated net present values (NPVs) of proposed
designs are 1.7–2.4 times greater than that of the conventional
design. In addition, the NGLs-rich shale gas generally results in
3.17–5.12 times higher NPV than NGLs-lean shale gas.
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