Group II Base Stock Blending for Lubricant Cost Reduction
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Solution Overview
Problem
Current base stock manufacturing processes face challenges in achieving optimal boiling ranges, viscosity indexes, Noack volatilities, and CCS VIS at −25° C, leading to inefficiencies in blending high-quality finished lubricants, particularly in reducing the need for expensive Group III and Group IV base oils.
Innovation Solution
Development of base stocks with specific boiling ranges, viscosity indexes, and Noack volatilities through hydrocracking, separating, and dewaxing processes, allowing for the creation of base stocks like Chevron 170RLV and Chevron 110RLV, which can be blended to produce high-quality lubricants with reduced reliance on expensive base oils, and the creation of a base stock slate that enhances blending power and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional base stock manufacturing processes are used, then production cost is reduced, but blending efficiency and lubricant quality are insufficient
Solution Approach 1:
The patent applies parameter changes by precisely controlling hydrocracking conditions (temperature, pressure, catalyst type) and dewaxing parameters to produce base stocks with specific viscosity indexes (105-130), boiling ranges (730-1000°F), and Noack volatilities (5-11.5 wt%). These parameter optimizations enable the base stocks to achieve superior blending efficiency while maintaining cost-effectiveness through Group II classification.
2Reliability
If Group III and Group IV base oils are used extensively, then lubricant quality is improved, but manufacturing cost increases
Solution Approach 1:
The patent employs Group II base stocks with optimized properties as a cost-effective alternative to expensive Group III and Group IV base oils. By achieving viscosity indexes of 105-130 and controlled Noack volatilities through hydrocracking and dewaxing, the invention creates a cheaper base stock that can be blended to achieve desired lubricant qualities without requiring high-cost Group III/IV components.
Solution Approach 2:
The patent creates composite lubricant formulations by blending the newly developed Group II base stocks with additives and potentially smaller proportions of other base oil types. This composite approach allows achievement of high lubricant quality through synergistic combinations, reducing dependence on expensive single-component Group III/IV base oils while maintaining performance requirements.
3Productivity
If base stocks with optimized viscosity indexes and Noack volatilities are produced, then blending efficiency is improved, but process complexity increases
Solution Approach 1:
The patent segments the base stock production process into distinct hydrocracking and dewaxing stages, each optimized for specific property developments. The hydrocracking stage controls viscosity index formation through controlled cracking, while the dewaxing stage independently adjusts pour point and refining properties. This segmentation allows precise control of blending-critical parameters without requiring overly complex integrated processes.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The described process and base stocks enable the production of high-quality lubricants with improved blending efficiency and reduced costs by minimizing the use of expensive Group III and Group IV base oils, while maintaining desired viscosity and volatility characteristics, thus addressing the inefficiencies in existing manufacturing methods.
Implementation Method 1
The operating conditions in the hydrocracking zone are selected to convert a heavy hydrocarbon feedstock to a product slate containing greater than 30 wt % of a waxy intermediate fraction
Implementation Method 2
separating (by vacuum distillation) the waxy intermediate fraction from the hydrocracker
Implementation Method 3
The waxy intermediate fraction is hydroisomerization dewaxed to produce a base stock
Data Source
AI summary
We provide a base stock comprising hydrocarbons with consecutive numbers of carbon atoms, wherein the base stock has a boiling range from 388 to 538° C., a VI from 105 to less than 130, and a Noack volatility from 5 to 11.5 wt % or a CCS VIS at −25° C. from 2000 to 4000 mPa·s. We also provide a base stock slate comprising the base stock and an additional base stock having an additional boiling range from 371 to 496° C., and other properties.