Bio-Based Olefin Conversion via Oxidation-Decarboxylation
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Solution Overview
Problem
Existing methods struggle to produce high-quality olefins with a purity of greater than 90% (pMC) from renewable raw materials, which are often heterogeneous and contain impurities, for applications in industries such as hydrocarbon resin modification, fuel additives, and pharmaceutical ingredients.
Innovation Solution
A process involving the oxidation of C5-C8 primary alcohols to corresponding carboxylic acids followed by oxidative decarboxylation to produce lower olefins with 4 to 7 carbon atoms, using a combination of nitric acid oxidation and homogeneous catalysts like palladium complexes, achieving yields of at least 80% of the theoretical maximum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional methods are used to convert renewable raw materials to olefins, then the process can handle heterogeneous materials with impurities, but the olefin purity cannot exceed 90%
Solution Approach 1:
The conversion process is divided into two distinct stages: (1) oxidation of primary alcohol to carboxylic acid, and (2) decarboxylation of carboxylic acid to olefin. This segmentation allows each stage to be optimized independently, with the first stage handling impurity removal and the second stage achieving high purity olefin production, thereby resolving the contradiction between handling heterogeneous materials and achieving high purity output.
Solution Approach 2:
Carboxylic acid serves as an intermediary compound between the primary alcohol and the final olefin product. This intermediary enables the transformation to proceed through controlled oxidation and decarboxylation steps, allowing impurities to be managed during the oxidation phase while achieving high purity in the decarboxylation phase, thus resolving the purity versus ease of manufacture contradiction.
2Adaptability or versatility
If dehydration of bioethanol is used to produce ethylene, then the process is commercially advanced, but it cannot produce propylene and isobutylene effectively
Solution Approach 1:
The oxidation-decarboxylation process sequence is universally applicable to various primary alcohols (C5-C8) derived from renewable sources, enabling production of multiple olefin types (propylene, isobutylene, and higher olefins) from a single process framework. This multi-functionality allows the process to adapt to different feedstocks and target olefins, resolving the limitation of ethylene-only production while maintaining process viability.
Solution Approach 2:
By changing the carbon chain length parameter of the primary alcohol substrate (using C5-C8 alcohols instead of just ethanol), the process can produce different olefin products (propylene, isobutylene, pentene, hexene) while following the same oxidation-decarboxylation mechanism. This parameter change enables versatility across multiple olefin types without compromising process reliability.
3Quantity of substance
If catalytic or steam cracking of fossil feedstocks is used, then propylene and isobutylene can be produced, but fossil resources are depleted and costs increase
Solution Approach 1:
The process changes the carbon source parameter from fossil-based to renewable-based (biomass-derived primary alcohols). By using C5-C8 primary alcohols from renewable sources as the carbon feedstock, the process maintains high olefin yields while eliminating dependence on depleting fossil resources, thus resolving the contradiction between quantity of substance produced and loss of substance from fossil depletion.
Solution Approach 2:
The process replaces the high-energy mechanical/thermal cracking methods with a chemical transformation sequence (oxidation followed by decarboxylation). This substitution allows olefin production from renewable chemical feedstocks without requiring the energy-intensive fossil fuel cracking processes, thereby maintaining olefin yield while avoiding fossil resource depletion.
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 renewable raw materials into high-purity olefins with a purity greater than 90% (pMC), providing a robust method for producing olefins suitable for various industrial applications.
Implementation Method 1
oxidation of the primary alcohol to the corresponding carboxylic acid
Implementation Method 2
oxidative decarboxylation of the carboxylic acid to an olefin
Data Source
AI summary
Propylene is an important industrial intermediate for the production of propylene oxide and polypropylene, while isobutylene is similarly widely used for the production of a variety of industrially important products, such as butyl rubber. Both of propylene and isobutylene are obtained through the catalytic or steam cracking of fossil feedstocks, and the development of a commercially viable process for the direct conversion of alcohol to either material would accordingly be of great interest as fossil resources are depleted and/or become more costly to use, especially in consideration of increased demand for both of propylene and isobutylene. The present invention relates to the process for preparing lower olefins from primary alcohols. More particularly the present invention relates to the process of conversion of primary alcohols to lower olefins wherein the primary alcohols are obtained from renewable sources.