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A more detailed analysis of bulk composition, trace components and operation requirements of each technology shows that combining of product recovery may result in a significantly more complex separation task compared to the individual separations. Rather than raising synergies in separation, both effluents bear the risk of âcontaminatingâ each other. Moreover, process integration always adds complexity and possible undesired interdependencies.
This paper presents a more detailed study of integration potentials for PDH and steam cracking. Most important aspects regarding differences between cracked gases and PDH effluents are described. Related characteristics of different PDH technologies and their impact on integration scenarios are analyzed on a high level.
Some promising scenarios are derived, which focus on synergetic potentials of PDH and steam cracker integration, while possible risks from detrimental effects are avoided or minimized.
Finally, the paper outlines some properties from an existing plant, where a highly customized small-scale cracker and ethylene recovery process is integrated into a large-scale PDH. The design includes a substantially simplified cold section, which applies pressure swing adsorption technology, omitting the requirement of very low temperatures and matching or even exceeding olefin recoveries of conventional low temperature processes.