CDTECH^®, a partnership of Lummus Technology and Chemical Research & Licensing Co., offers several commercially proven catalytic distillation processes for the hydroprocessing of various refinery streams.

The combination of the CDHydro⁽¹⁾ hydrogenation and CDHDS⁽¹⁾ /CDHDS+⁽¹⁾ dehydrodesulfurization processes is a low capital cost and operating cost solution to effectively reduce the sulfur level of full-range FCC naphtha while retaining most of the octane value of the FCC naphtha without yield loss. Sulfur content is reduced by more than 99%, allowing refiners to meet even the most severe gasoline sulfur regulations.

The CDHydro process selectively hydrogenates various refinery and steam cracker streams:

• C₃+ streams from steam crackers to produce a C₃ stream that is essentially free of methyl acetylene and propadiene (MAPD) (selective hydrogenation of MAPD to propylene).
• C₄ streams from refineries to produce a stream with a high butylenes content that is essentially free of butadiene (selective hydrogenation of butadiene to normal butenes). The treated C₄ stream is suitable for MTBE production, butene-1 production, or alkylation feed.
• C₄ streams from refineries or steam crackers within an MTBE/ETBE debutanizer to produce a raffinate with a high butylenes content that is essentially free of butadiene (selective hydrogenation of butadiene to normal butenes).
• C₅ streams from refineries to produce a stream with a high isoamylenes content that is essentially free of diolefins (selective hydrogenation of the diolefins to amylenes). The treated C₅ stream is suitable for TAME production or alkylation feed.
• Reformate streams from refineries to reduce benzene to levels required in reformulated gasoline (hydrogenation of benzene to cyclohexane).

(1) CDHydro, CDHDS+ and CDHDS are registered trademarks of CDTECH.