Catalytic dewaxing processes using alumina free coated catalyst
First Claim
1. In a process for the catalytic dewaxing of a hydrocarbon oil feed consisting essentially of a gas oil and a lubricating base oil, wherein both have waxy molecules therein, which process comprises the steps of:
- (a) contacting the feed under catalytic dewaxing conditions with a catalyst composition comprising a molecular sieve containing crystallites covalently bound alumina moieties in its framework and having pores with a diameter in the range of from 0.35 to 0.80 nm, wherein said crystallites have a surface, and(b) recovering a product having a reduced pour point,wherein the improvement of the process consists of modifying said molecular sieve to reduce the mole percentage of alumina by coating said surface of said crystallites with a refractory inorganic oxide which is essentially free of alumina.
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Abstract
A process is disclosed for the catalytic dewaxing of a hydrocarbon oil feed comprising waxy molecules, which process comprises:
contacting a feed under catalytic dewaxing conditions with a catalyst composition comprising a molecular sieve containing crystallites covalently bound alumina moieties in its framework and having pores with a diameter in the range of from 0.35 to 0.80 nm and recovering a product having a reduced pour point, wherein the molecular sieve has been modified to reduce the mole percentage of alumina by coating the surface of the crystallites with a refractory inorganic oxide which is essentially free of alumina.
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Citations
14 Claims
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1. In a process for the catalytic dewaxing of a hydrocarbon oil feed consisting essentially of a gas oil and a lubricating base oil, wherein both have waxy molecules therein, which process comprises the steps of:
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(a) contacting the feed under catalytic dewaxing conditions with a catalyst composition comprising a molecular sieve containing crystallites covalently bound alumina moieties in its framework and having pores with a diameter in the range of from 0.35 to 0.80 nm, wherein said crystallites have a surface, and (b) recovering a product having a reduced pour point, wherein the improvement of the process consists of modifying said molecular sieve to reduce the mole percentage of alumina by coating said surface of said crystallites with a refractory inorganic oxide which is essentially free of alumina. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification