Light Alkane Conversion via Aromatization and Hydroalkylation to Diesel

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Solution Overview

Problem

The abundant supply of light alkanes such as propane, butanes, and pentanes from the shale boom and increasing regulation of transportation fuels necessitates a technology to upgrade these into higher value products like high cetane diesel.

Innovation Solution

A process involving three steps: converting light alkanes to aromatic hydrocarbons using an aromatization catalyst, then to diesel range hydrocarbons via hydroalkylation, and finally hydrogenating to achieve a cetane number of at least 35 using a hydrogenation catalyst.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If light alkanes are converted to aromatic hydrocarbons via aromatization, then the conversion efficiency to diesel range hydrocarbons improves, but the cetane number of the resulting fuel decreases

Engineering Contradiction:

Improveconversion efficiencyVSAvoidcetane number

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The process is divided into three distinct sequential steps: (1) aromatization of light alkanes to aromatic hydrocarbons, (2) hydroalkylation of aromatics to diesel range hydrocarbons, and (3) hydrogenation to improve cetane number. Each step uses a specific catalyst optimized for its function, allowing the process to achieve both high conversion efficiency and acceptable cetane number by separating the conversion and quality improvement functions into different stages

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Aromatic hydrocarbons serve as an intermediary intermediate product between the light alkane feedstock and the final diesel product. The process converts light alkanes to aromatics first, then uses these aromatics as feedstock for hydroalkylation to produce diesel range hydrocarbons, and finally hydrogenates these intermediates to achieve the desired cetane number. This intermediary approach allows optimization of each transformation step independently

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If a multi-step catalytic process is used to convert light alkanes to diesel, then the cetane number improves, but the process complexity increases

Engineering Contradiction:

Improvecetane numberVSAvoidprocess complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent combines three catalytic reactions (aromatization, hydroalkylation, and hydrogenation) into a single integrated process flow. While the chemistry is complex, the process structure is simplified by using sequential reactor beds with appropriate separation units between stages, allowing the complex chemistry to be managed through modular process design rather than requiring complex simultaneous reactions

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The process uses parameter changes (temperature, pressure, catalyst type) to optimize each step. By adjusting these parameters at each stage, the process achieves high cetane number while maintaining manageable complexity. For example, the aromatization step uses specific temperature and catalyst conditions to maximize aromatic formation, followed by hydroalkylation under different conditions to produce diesel range hydrocarbons, and finally hydrogenation at optimized parameters to improve cetane number

Inventive Principle:

Principle #35Parameter changes

3Productivity

If light alkanes are upgraded to high value diesel products, then the product value improves, but the processing cost increases

Engineering Contradiction:

Improveproduct valueVSAvoidprocessing cost

Core Design Contradiction:

ProductivityVSEase of manufacture

Solution Approach 1:

The process optimizes economic parameters by using catalysts with specific activity and selectivity characteristics. By choosing appropriate catalyst compositions and operating conditions (temperature, pressure, space velocity), the process maximizes the conversion of low-value light alkanes to high-value diesel while minimizing byproducts and energy consumption, thereby improving product value relative to processing cost

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 process effectively converts at least 30% of light alkanes to diesel range hydrocarbons, achieving a cetane number of at least 35, suitable for diesel fuel.

Implementation Method 1

reacting a feed rich in one or more light alkanes with an aromatization catalyst to convert the one or more light alkanes to aromatic hydrocarbons

Methodology Applied

Scientific EffectCatalysis: Catalysis

Implementation Method 2

reacting the first liquid product with a hydroalkylation catalyst to convert the aromatic hydrocarbons into diesel range hydrocarbons

Methodology Applied

Scientific EffectHydroalkylation: Chemical Bonding

Implementation Method 3

hydrogenating the third liquid product to produce a diesel product having a cetane number of at least 35

Methodology Applied

Scientific EffectHydrogenation: Hydrogenation

Data Source

PatentUS12553002B2Process to convert light alkanes to diesel

Publication Date: 2026.02.17 PHILLIPS 66 CO

AI summary

Various embodiments of a process for converting light alkanes to diesel are disclosed. In general, the process includes reacting a feed rich in one or more light alkanes with an aromatization catalyst to convert the light alkanes to aromatic hydrocarbons, reacting the aromatic hydrocarbons with a hydroalkylation catalyst to convert the aromatic hydrocarbons into diesel range hydrocarbons, and hydrogenating the diesel range hydrocarbons to produce a diesel product.