Long-Chain Olefin Production via Sulfate-Modified Alumina Catalyst
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Solution Overview
Problem
Existing processes for producing long-chain olefins face challenges such as high energy consumption due to vaporization of long-chain aliphatic alcohols, silica-alumina catalysts causing branching and yield reduction, and lack of efficiency in suppressing side reactions like alkyl rearrangement and multimer production.
Innovation Solution
A process involving dehydration reaction of long-chain aliphatic alcohols using a solid acid catalyst composed of aluminum oxide and an oxide of an element with higher electronegativity than aluminum, such as sulfur, tungsten, or silicon, supported on aluminum oxide, which enhances reaction efficiency and selectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If gas phase dehydration reaction is used to produce long-chain olefins, then the reaction can proceed with good conversion, but large energy consumption is required due to vaporization of long-chain aliphatic alcohol
Solution Approach 1:
The patent transitions from gas phase reaction to liquid phase reaction. By conducting the dehydration reaction in the liquid phase, the need to vaporize long-chain aliphatic alcohol is eliminated, significantly reducing energy consumption while maintaining effective reaction conversion through optimized liquid phase conditions and catalyst selection
2Productivity
If silica-alumina catalyst is used for dehydration reaction, then the reaction can proceed, but branching of olefins occurs due to alkyl rearrangement and yield is reduced
Solution Approach 1:
The patent changes the catalyst composition parameters by replacing silica-alumina with sulfate-modified alumina. This parameter change modifies the catalyst's acid site characteristics, suppressing alkyl rearrangement reactions that cause branching while maintaining dehydration reaction rate, thereby improving olefin yield
Solution Approach 2:
The patent creates a composite catalyst material by combining alumina with sulfate groups. This composite structure provides controlled acid sites that promote dehydration while minimizing side reactions like alkyl rearrangement, achieving both high reaction rate and high olefin yield
3Productivity
If conventional catalysts are used for dehydration reaction, then the reaction can proceed, but side reactions like alkyl rearrangement and multimer production occur
Solution Approach 1:
The patent modifies the catalyst parameters by introducing sulfate modification to alumina. This changes the distribution and strength of acid sites, enabling the catalyst to promote dehydration reaction while suppressing side reactions such as alkyl rearrangement and multimer formation, thus reducing harmful by-products
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
This process enables the production of long-chain olefins with high yield and selectivity, reducing energy consumption and side reactions, while maintaining a high reaction rate and minimizing branching and multimer production.
Implementation Method 1
subjecting an alcohol having not less than 8 and not more than 22 carbon atoms to dehydration reaction in the presence of a solid acid catalyst
Data Source
AI summary
The present invention relates to a process for producing olefins, including the step of subjecting an alcohol having not less than 8 and not more than 22 carbon atoms to dehydration reaction in the presence of a solid acid catalyst, in which the solid acid catalyst includes aluminum oxide and an oxide of an element having an electronegativity higher than that of aluminum which is supported on the aluminum oxide.