Process for preparing lube basestocks having superior low temperature properties at high VI
First Claim
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1. A two stage process for dewaxing a waxy lube feedstock which comprises:
- (a) contacting a feedstock in a first dewaxing stage with at least one 1D, 10-ring molecular sieve containing catalyst having a refined constraint index of 2.0 or less under first hydroisomerizing dewaxing conditions to produce a first dewaxed product stream; and
(b) contacting said first dewaxed product stream in a second dewaxing stage with at least one 1D, 10-ring molecular sieve containing catalyst having a refined constraint index of greater than 2.0 under second hydroisomerizing dewaxing conditions to produce a dewaxed product.
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Abstract
A process for preparing basestocks having superior low temperature properties at high viscosity index (VI). More particularly, a waxy feedstock is contacted with a first dewaxing catalyst having a refined constraint index (CI*) 2.0 or less followed by contacting with a second dewaxing catalyst having a refined constraint index greater than 2.0.
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Citations
20 Claims
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1. A two stage process for dewaxing a waxy lube feedstock which comprises:
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(a) contacting a feedstock in a first dewaxing stage with at least one 1D, 10-ring molecular sieve containing catalyst having a refined constraint index of 2.0 or less under first hydroisomerizing dewaxing conditions to produce a first dewaxed product stream; and (b) contacting said first dewaxed product stream in a second dewaxing stage with at least one 1D, 10-ring molecular sieve containing catalyst having a refined constraint index of greater than 2.0 under second hydroisomerizing dewaxing conditions to produce a dewaxed product. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification