Renewable Diesel Separation for Jet Fuel Gum Control
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Solution Overview
Problem
Existing methods for producing renewable diesel for aviation turbine fuels result in high gum values and potential polymeric contaminants, which are not suitable for jet fuel specifications, leading to concerns about storage stability and potential deposition in jet engine components.
Innovation Solution
A method involving hydrotreating and hydroisomerizing naturally occurring fatty acids in the C14-C18 range to produce hydrocarbons, followed by separation to obtain an overhead renewable diesel fraction with a gum value of 7 mg/100 mL or less and a distillation boiling range difference of 20° C. or less between the final boiling point and 95% boil-off temperature, using a flash drum for separation instead of energy-intensive distillation columns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional hydrotreating and hydroisomerizing methods are used to produce renewable diesel, then the production process is simple and energy-efficient, but the product has high gum values and polymeric contaminants that do not meet jet fuel specifications
Solution Approach 1:
The patent divides the hydrocarbon product into distinct fractions based on boiling point ranges. The separator unit divides the hydroisomerized product into a light naphtha fraction (C5-C12), a middle distillate fraction (C13-C18), and a heavy gas oil fraction (C19+). This segmentation removes the problematic heavy fractions that contain polymeric contaminants and high gum values, leaving a purified middle distillate fraction that meets jet fuel specifications.
Solution Approach 2:
The patent extracts and removes the heavy gas oil fraction (C19+) and light naphtha fraction (C5-C12) from the hydroisomerized product. By taking out these extreme fractions, the process eliminates the sources of polymeric contaminants and high gum values, concentrating the desirable C13-C18 middle distillate fraction that conforms to jet fuel specifications.
2Manufacturing precision
If distillation columns are used to achieve the required boiling range conformance, then the product meets specifications, but the process becomes energy-intensive and costly
Solution Approach 1:
The patent changes the separation parameter from temperature-based distillation to boiling point-based fractional separation. Instead of using energy-intensive distillation columns that require continuous heating and reflux, the process uses a separator unit that divides the hydroisomerized product into fractions with specific boiling point ranges (light naphtha C5-C12, middle distillate C13-C18, heavy gas oil C19+). This parameter change achieves the required boiling range conformance with significantly lower energy consumption.
3Quantity of substance
If the full hydroisomerized product is used as jet fuel blendstock, then maximum renewable content is achieved, but polymeric contaminants and high gum values compromise storage stability and engine safety
Solution Approach 1:
The patent segments the hydroisomerized product to isolate the middle distillate fraction (C13-C18) that provides the optimal balance between renewable content and storage stability. By separating this fraction from the heavy gas oil (C19+) that contains polymeric contaminants, the process maximizes the quantity of usable renewable diesel while ensuring the product meets jet fuel specifications for gum values and storage stability.
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 method produces a renewable diesel product that meets jet fuel gum specifications, reducing the risk of polymeric contaminants and achieving a boiling range conformance without the need for costly distillation, thus enhancing storage stability and safety for aviation applications.
Implementation Method 1
hydrotreating and hydroisomerizing naturally occurring fatty acids in the C14-C18 range to hydrocarbons
Implementation Method 2
hydrotreating and hydroisomerizing naturally occurring fatty acids in the C14-C18 range to hydrocarbons
Implementation Method 3
a separator for separating the hydrocarbons such that an overhead renewable diesel fraction comprising C14-C18 n-paraffins and iso-paraffins is obtained
Data Source
AI summary
The present technology relates to hydrocarbon fuels comprising renewable content. More particularly, the technology relates to manufacture of renewable diesel for potential use as aviation turbine fuel blendstock.