BioLPG Production with Zeolite Catalysts for Higher C3-C4 Yield
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Solution Overview
Problem
Existing processes for producing BioLPG (biological liquefied petroleum gas) suffer from low yields and lack commercial viability, with conventional methods primarily focusing on longer chain hydrocarbons or olefins, producing LPG as a secondary by-product in low yields.
Innovation Solution
A process using specific zeolite catalysts, such as ZSM5 and MCM22, converts aliphatic alcohols derived from renewable sources into BioLPG in high yield by optimizing reaction conditions, including temperature, pressure, and catalyst promotion with elements like boron and phosphorus, and rejuvenating catalysts with air exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional hydrotreatment processes are used to produce BioLPG from bio-oils, then Biodiesel production is achieved, but BioLPG yield is low (ratio of biodiesel to biopropane is typically around 9:1 to 10:1)
Solution Approach 1:
The patent changes the reaction parameters by using different catalysts (zeolites such as ZSM-5, beta, Y, or mordenite) and adjusting reaction conditions (temperature of 200-400°C, pressure of 1-50 bar) to shift the product distribution from biodiesel-dominated to BioLPG-dominated, achieving BioLPG yields of 60-80%
Solution Approach 2:
The patent uses ethanol as a model compound to replicate and study the conversion mechanisms of complex bio-oils, allowing optimization of reaction conditions for high BioLPG yield before applying to real bio-oil feedstocks
2Quantity of substance
If processes are optimized for production of longer chain hydrocarbons or olefins, then those products are produced, but LPG is only formed as a secondary by-product in low yield
Solution Approach 1:
Instead of producing LPG as a by-product of longer chain hydrocarbon synthesis, the patent inverts the approach by using ethanol dehydration to ethylene as the primary reaction, followed by oligomerization to directly produce C3-C4 hydrocarbons (LPG) as the main product
Solution Approach 2:
The patent segments the conversion process into distinct stages: ethanol dehydration to ethylene, ethylene oligomerization to C3-C4 hydrocarbons, and selective hydrogenation, with each stage optimized for maximum LPG production
3Productivity
If catalysts are used for BioLPG production, then conversion efficiency is improved, but catalyst lifetime is limited and selectivity diminishes with use
Solution Approach 1:
The patent implements a catalyst regeneration cycle where spent catalyst is periodically regenerated by burning off coke deposits in situ, restoring catalyst activity and selectivity without removing the catalyst from the reactor, thereby extending catalyst lifetime
Solution Approach 2:
The catalyst is designed to be self-regenerating through periodic oxidation treatments that remove deactivating coke deposits, allowing the catalyst to maintain its performance over extended periods without replacement
4Productivity
If BioLPG production is scaled up for commercial viability, then production volume increases, but economic feasibility is compromised due to low yields
Solution Approach 1:
The patent optimizes reaction parameters (temperature, pressure, catalyst composition, ethanol-to-water ratio) to achieve BioLPG yields of 60-80%, making the process economically viable by maximizing the value product from the feedstock
Solution Approach 2:
The patent uses ethanol as a surrogate feedstock to develop and optimize the conversion process, allowing thorough parameter optimization and mechanism understanding before scaling to commercial bio-oil feedstocks, reducing technical and economic risks
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 achieves high yields of BioLPG, extending catalyst lifetime, and maintains selectivity for C3 and C4 hydrocarbons, with the ability to rejuvenate catalysts, making it economically viable.
Implementation Method 1
certain zeolite catalysts, such as ZSM5 and MCM22, converts aliphatic alcohols derived from renewable sources into BioLPG in high yield
Implementation Method 2
catalyst promotion with elements like boron and phosphorus
Implementation Method 3
rejuvenating catalysts with air exposure
Data Source
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AI summary
The present invention is in the field of processes for the production of BioLPG, and catalysts for use in said processes.