Carbon Disulfide Removal to Help Meet New Specifications for Petrochemical Grade Naphtha

Source: AIChE
  • Type:
    Conference Presentation
  • Conference Type:
    AIChE Spring Meeting and Global Congress on Process Safety
  • Presentation Date:
    March 27, 2017
  • Duration:
    30 minutes
  • PDHs:

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Ethylene producers have linked carbon disulfide (CS2) in petrochemical grade naphtha (PCN) to corrosion in locations downstream of the cracker and to deterioration of pygas hydrogenation catalyst activity. This has led some producers to implement very low specifications (ppm levels) of CS2 in petrochemical grade naphtha. Other customers 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. Adsorptive removal of CS2 represents an economically attractive solution.

To help meet this growing need, Honeywell UOP have developed a new adsorbent, Molsiv CS2-100, for CS2 removal from petrochemical grade naphtha/NGL. The new adsorbent can remove CS2 efficiently thereby upgrading PCN/NGL feeds. Extensive pilot plant testing with a variety of commercial feeds has been conducted to demonstrate economic viability of an adsorptive solution. Discussion will focus on Honeywell UOP’s technology offering using the CS2-100 molecular sieve adsorbent that can selectively remove CS2 from straight run naphtha/NGL streams to help meet the needs of PCN suppliers and ethylene producers.

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