Renewable Jet Fuel Isomerization Cold Flow

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Current methods for producing hydrocarbon fuels from renewable feedstocks, such as vegetable oils and animal fats, result in products with poor low-temperature properties, specifically high cloud points, making them unsuitable for use as jet fuel due to inadequate cold flow requirements.

Innovation Solution

A method involving hydrotreating and hydroisomerizing a renewable feedstock to produce an isoparaffinic product, which is then fractionated into jet fuel and LPG, with improved cold flow properties, including a viscosity of less than 5 centistokes at -20°C and a freezing point of less than -47°C.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If hydroprocessing or decarboxylation/decarbonylation followed by isomerization is used to produce diesel fuel additives from renewable feedstock, then cetane number is improved, but cloud point becomes too high for jet fuel use

Engineering Contradiction:

Improvecetane numberVSAvoidcloud point

Core Design Contradiction:

ReliabilityVSTemperature

Solution Approach 1:

The patent applies parameter changes by modifying the isomerization process conditions and catalyst system to produce highly branched isoparaffins with cloud points below -47°C, transforming the product properties from diesel-range to jet fuel specification range while maintaining high cetane numbers

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent produces a composite hydrocarbon mixture containing C8-C16 isoparaffins with specific branching patterns that combine the advantages of high cetane number (from isomerization) with low cloud point (from extensive branching), creating a fuel blendstock suitable for jet fuel applications

Inventive Principle:

Principle #40Composite materials

2Reliability

If n-paraffins are isomerized to branched-chain paraffins to produce middle distillate fuel, then fuel suitability is improved, but cloud point remains too high

Engineering Contradiction:

Improvefuel suitabilityVSAvoidcloud point

Core Design Contradiction:

ReliabilityVSTemperature

Solution Approach 1:

The patent changes the isomerization parameters including using specific catalysts (e.g., zeolites, alumina-silica) and operating conditions (temperature, pressure, space velocity) to achieve extensive branching that lowers cloud point below -47°C, meeting jet fuel specifications

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates local quality differences in the hydrocarbon molecules by producing highly branched isoparaffins with specific carbon number distributions (C8-C16), where the branching structure at molecular level provides low temperature fluidity while maintaining combustion properties

Inventive Principle:

Principle #3Local quality

3Adaptability or versatility

If renewable feedstock is used to produce hydrocarbon fuels, then resource sustainability is improved, but cold flow properties deteriorate

Engineering Contradiction:

Improveresource sustainabilityVSAvoidcold flow properties

Core Design Contradiction:

Adaptability or versatilityVSTemperature

Solution Approach 1:

The patent transforms renewable feedstock (vegetable oils, animal fats) through hydroprocessing and isomerization with specific process parameters to convert linear chains into highly branched structures, changing the physical properties to achieve cloud points below -47°C while maintaining the renewable origin

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses hydroprocessing and isomerization as intermediary processes that convert the problematic linear structures of renewable feedstocks into branched isoparaffins, acting as a bridge between renewable resources and jet fuel specification requirements

Inventive Principle:

Principle #24Intermediary (Mediator)

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 resulting jet fuel exhibits improved cold flow properties, meeting aviation fuel specifications with lower viscosity, higher isomer/normal mass ratio, and higher heat of combustion, addressing the limitations of existing processes.

Implementation Method 1

hydrotreating a renewable feedstock to produce a hydrotreated heavy fraction and a light fraction

Methodology Applied

Scientific EffectHydrogenation: Hydrogenation

Implementation Method 2

hydroisomerizing the hydrotreated heavy fraction to produce a hydroisomerized heavy fraction and a light fraction

Methodology Applied

Scientific EffectIsomerization:

Implementation Method 3

The hydroisomerized heavy fraction is passed into a separator to remove the isoparaffin product

Methodology Applied

Scientific EffectPhase separation:

Data Source

PatentUS7846323B2Process for co-producing jet fuel and LPG from renewable sources

Publication Date: 2010.12.07 REG SYNTHETIC FUELS LLC

AI summary

The present invention generally relates to a method for producing an isoparaffinic product useful as jet fuel from a renewable feedstock. The method may also include co-producing a jet fuel and a liquefied petroleum gas (LPG) fraction from a renewable feedstock. The method includes hydrotreating the renewable feedstock to produce a hydrotreating unit heavy fraction that includes n-paraffins and hydroisomerizing the hydrotreating unit heavy fraction to produce a hydroizomerizing unit heavy fraction that includes isoparaffins. The method also includes recycling the hydroisomerizing unit heavy fraction through the hydroisomerization unit to produce an isoparaffinic product that may be fractionated into a jet fuel and an LPG fraction. The present invention also relates to a jet fuel produced from a renewable feedstock having improved cold flow properties.