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US 11,542,446 B2Granted
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
Life of this patent
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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 comprises a monosaccharide and a cationic surfactant having a quaternary ammonium group comprising at least one alkyl having at least 12 carbon atoms, 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.
2 more elements
A method for dewaxing a hydrocarbon feed using a catalyst comprising a molecular sieve, comprising:
- hydrotreating the hydrocarbon feed under effective hydrotreating conditions, hydrocracking the hydrocarbon feed under effective hydrocracking conditions, hydrofinishing the hydrocarbon 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, wherein the morphology modifier L is combined with the other components before nucleation or crystallization begins, wherein the synthesis mixture is a liquid or a mixture of a solid and liquid, and the liquid is substantially a single phase;
- 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 comprises a monosaccharide and a cationic surfactant having a quaternary ammonium group comprising at least one alkyl having at least 12 carbon atoms, 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.
6 more elements
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, wherein the morphology modifier L is combined with the other components before nucleation or crystallization begins, wherein the synthesis mixture is a liquid or a mixture of a solid and liquid, and the liquid is substantially a single phase;
- 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, the molecular sieve selected from the group consisting of ZSM-12, ZSM-22, ZSM-23, SAPO-11, a zeolite of an MRE framework type, and mixtures thereof,
- wherein the morphology modifier L comprises a monosaccharide and a cationic surfactant having a quaternary ammonium group comprising at least one alkyl having at least 12 carbon atoms, 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.
3 more elements
Dependencies are inferred from the claim text.