Ethylene producers have linked carbon disulfide (CS2) in petrochemical grade naphtha to corrosion in locations downstream of the cracker and to deterioration of Pygas hydrogenation catalyst activity. CS2 can poison the selective hydrogenation catalyst that is generally used to remove acetylenes and dienes in olefin plants. CS2 also contaminates C4 and C5 olefins and diolefins production in polymer plants and can be corrosive when it undergoes transformation to acids. This has led some producers to implement very low specifications (ppm levels) of CS2 in petrochemical grade naphtha. Other producers have also indicated CS2 as a primary contaminant particularly in some shale derived feedstocks. Thus CS2 contamination can effectively limit feedstock flexibility and associated costs.
Reactive removal of CS2 represents an economically attractive solution. To help meet this growing need, Dorf Ketal is in progress of developing a new chemical for CS2 removal from Petrochemical grade naphtha/NGL. The new product can remove CS2 efficiently thereby upgrading contaminated feedstocks. This paper will demonstrate some results of Lab testing, with a variety of commercial feeds, conducted to prove economic viability of an reactive solution.
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