Processes Chevron catalytic dewaxing

Isodewaxing A catalytic dewaxing process developed by Chevron Research Technology. It incorporates catalysts that achieve both wax isomerization and shape-selective cracking. 

Chevron s wax isomerization process uses Pt-SAPO-11 [46,47], Wax isomerization is far superior than previous catalytic dewaxing processes because it reduces the pour point of lubes and fuels with minimum hydrocracking, and because it makes very high VI products Multiple branching, which decreases the viscosity index, is limited. Low selectivity for cyclic coke precursors makes long catalyst life possible. 

The two lighter streams were catalytically dewaxed by a ZSM-5-type catalyst, while the heavy stream was solvent dewaxed (in a later modification, all streams were dewaxed by Chevron s Isodewaxing process, which isomerizes wax rather than hydrocracking it). 

Source S. J. Miller, New Molecular Sieve Process for Lube Dewaxing by Wax Isomerization, Paper presented at the Symposium on New Catalytic Chemistry Utilizing Molecular Sieves, 206th National Meeting of the American Chemical Society, Aug 23-27, 1993. Table copyrighted by the Chevron Corporation and used with permission. 

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