Dewaxing using a molecular sieve catalyst
AssigneeExxon Mobil Technology and Engineering Company
InventorsPreeti Kamakoti, Scott J. Weigel, Stephen J. McCarthy, Shifang L. Luo, Sina Sartipi, Martine Dictus, Marc H. Anthonis, Helge Jaensch
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Abstract
Methods are provided for using a molecular sieve catalyst for dewaxing formed using a synthesis mixture comprising a morphology modifier. The catalyst may be used, for example, for production of a lubricant base stock. For example, ZSM-48 crystals formed using the morphology modifier (and/or formulated catalysts made using such crystals) can have an increased activity and/or can provide an improved yield during catalytic dewaxing of lubricant base stocks.
Claims26
A method for dewaxing a hydrocarbon feed using a catalyst comprising a molecular sieve, comprising:
- exposing the hydrocarbon feed to a catalyst comprising crystals of a molecular sieve under effective dewaxing conditions to form a dewaxed effluent, at least a portion of the crystals of the molecular sieve being crystallized in a process comprising:
- a. combining at least a source of a tetravalent element X, a morphology modifier L, and water to form a synthesis mixture;
- b. heating said synthesis mixture under crystallisation conditions for a time of about 1 hour to 100 days to form the crystals of the molecular sieve;
- and
- c. recovering said crystals of the molecular sieve from the synthesis mixture,
- wherein the morphology modifier L is a sugar, a cationic surfactant having a quaternary ammonium group comprising at least one alkyl having at least 12 carbon atoms, a nonionic surfactant, an anionic surfactant or any combination thereof, and if the synthesis mixture comprises a structure directing agent Q then the morphology modifier L is different from and is present in addition to the structure directing agent Q.
A method for dewaxing a hydrocarbon feed using a catalyst comprising a molecular sieve, comprising:
- hydrotreating the feed under effective hydrotreating conditions, hydrocracking the feed under effective hydrocracking conditions, hydrofinishing the feed under effective hydrofinishing conditions, or a combination thereof;
- then
- exposing the hydrocarbon feed to a catalyst comprising crystals of a molecular sieve under effective dewaxing conditions to form a dewaxed effluent, at least a portion of the crystals of the molecular sieve being crystallized in a process comprising the steps of:
- a. combining at least a source of a tetravalent element X, a morphology modifier L, and water to form a synthesis mixture;
- b. heating said synthesis mixture under crystallisation conditions for a time of about 1 hour to 100 days to form the crystals of the molecular sieve;
- and
- c. recovering said crystals of the molecular sieve from the synthesis mixture,
- wherein the morphology modifier L is selected from the group consisting of sugars, cationic surfactants having a quaternary ammonium group comprising at least one alkyl having at least 12 carbon atoms, nonionic surfactants, anionic surfactants and combinations thereof, and if the synthesis mixture comprises a structure directing agent Q then the morphology modifier L is different from and is present in addition to the structure directing agent Q;
- and
- hydrofinishing the dewaxed effluent under effective hydrofinishing conditions, the hydrofinishing optionally being performed after separating the dewaxed effluent to form at least one dewaxed diesel boiling range fraction, at least one dewaxed lubricating basestock fraction, or a combination thereof.
Dependencies are inferred from the claim text.