Renewable Diesel Composition Balancing Cetane and Cold Flow

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Solution Overview

Problem

Existing renewable hydrocarbon compositions for diesel fuel suffer from poor cold properties while maintaining a good cetane number, leading to issues in fuel performance and stability.

Innovation Solution

A renewable hydrocarbon composition is formulated with a specific distribution of monobranched, dibranched, and tribranched isoparaffins, along with n-paraffins, optimized to achieve a synergistic combination of high cetane number and low cloud point, using hydrotreatment and isomerization processes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If n-paraffins are used to achieve high cetane number, then combustion properties are improved, but cloud point increases (poor cold properties)

Engineering Contradiction:

Improvecetane numberVSAvoidcloud point

Core Design Contradiction:

ReliabilityVSTemperature

Solution Approach 1:

The patent applies local quality by creating a non-uniform distribution of paraffin types throughout the fuel composition. Specifically, it combines n-paraffins (for high cetane number) with isoparaffins having different branching patterns (for low cloud point). The composition specifies 15-30 wt% n-paraffins, 65-80 wt% monobranched isoparaffins, and 5-20 wt% dibranched isoparaffins, allowing each component to contribute its local advantage to the overall fuel properties.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent employs composite materials by combining multiple types of hydrocarbon molecules with different structural characteristics into a single fuel composition. The composite consists of n-paraffins (straight chains), monobranched isoparaffins (single branch), and dibranched isoparaffins (two branches). This composite structure allows the fuel to simultaneously achieve high cetane number (from n-paraffins) and low cloud point (from branched isoparaffins), resolving the contradiction between combustion quality and cold flow properties.

Inventive Principle:

Principle #40Composite materials

2Temperature

If isoparaffins are used to achieve low cloud point, then cold properties are improved, but cetane number decreases

Engineering Contradiction:

Improvecloud pointVSAvoidcetane number

Core Design Contradiction:

TemperatureVSReliability

Solution Approach 1:

The patent applies parameter changes by precisely controlling the branching parameters of the isoparaffins in the composition. It specifies that 65-80 wt% should be monobranched isoparaffins and 5-20 wt% should be dibranched isoparaffins, with particular attention to the position of branches (terminal vs. internal). This parameter optimization allows the isoparaffins to provide low cloud point while minimizing the negative impact on cetane number, and the presence of n-paraffins compensates for any cetane number loss.

Inventive Principle:

Principle #35Parameter changes

3Stability of the object's composition

If hydroprocessing is used to remove oxygen, then oxidation stability is improved, but hydrogen consumption increases and side reactions occur

Engineering Contradiction:

Improveoxidation stabilityVSAvoidhydrogen consumption

Core Design Contradiction:

Stability of the object's compositionVSLoss of substance

Solution Approach 1:

The patent applies parameter changes by optimizing the hydroprocessing conditions to achieve complete deoxygenation while minimizing side reactions. It specifies operating parameters including temperature (250-400°C), pressure (50-200 bar), and catalyst selection (NiMo, CoMo, or WS2 on alumina support). These parameter optimizations ensure high oxidation stability through complete oxygen removal while controlling hydrogen consumption and preventing excessive cracking or polymerization side reactions.

Inventive Principle:

Principle #35Parameter changes

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 composition achieves cetane numbers of 74 to 84 and cloud points ranging from -25 to -40°C, enhancing diesel fuel quality and performance across varying temperatures.

Implementation Method 1

Undesired oxygen may be removed from fatty acids or their esters by hydroprocessing. During hydroprocessing, particularly hydrodeoxygenation, oxygen containing groups are reacted with hydrogen and removed through formation of water

Methodology Applied

Scientific EffectHydrodeoxygenation: Reduction

Implementation Method 2

Methodology Applied

Scientific EffectIsomerization:

Data Source

PatentEP4038165B2Renewable hydrocarbon composition having good cetane number and good cold properties

Publication Date: 2025.11.19 NESTE OYJ

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AI summary

Here is provided a novel renewable hydrocarbon composition comprising monobranched isoparaffins, dibranched isoparaffins, tribranched isoparaffins multibranched isoparaffins, and n-paraffins, having carbon numbers from C8 to C30. Said renewable hydrocarbon composition has high cetane number and excellent cold properties. Additionally is provided use of the novel renewable hydrocarbon composition as diesel fuel or as a diesel fuel component.