Ethane and Ethanol Conversion to Liquid Fuels
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Solution Overview
Problem
The economic transportation of ethane is challenging due to its high energy intensity for liquefaction, and the increasing blending of biomass-derived ethanol into transportation fuels raises concerns about Reid Vapor pressure exceeding mandated levels, affecting vehicle operability and fuel compatibility.
Innovation Solution
A process involving thermal activation of ethane to produce a low-purity ethylene stream, which is then combined with biomass-derived ethanol and reacted over a catalyst to generate gasoline-range blend stock, with optional hydrogenation of unconverted gases to manage catalyst inhibition and produce valuable liquid hydrocarbons.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ethane is liquefied for transportation, then it can be transported, but the energy consumption increases significantly
Solution Approach 1:
The patent extracts ethane from its gaseous state and converts it into liquid hydrocarbon fuels through thermal cracking and catalytic conversion processes. By taking out ethane from its original form and transforming it into liquid products, the system eliminates the need for energy-intensive ethane liquefaction while achieving transportation feasibility through the liquid fuel products.
2Quantity of substance
If increasing quantities of biomass-derived ethanol are blended into transportation fuels, then renewable fuel content increases, but Reid Vapor pressure exceeds mandated levels
Solution Approach 1:
The patent converts the harmful effect of high vapor pressure from ethanol blending into a benefit by using ethanol as a feedstock for catalytic conversion. The ethanol is transformed into liquid hydrocarbon fuels with appropriate vapor pressure characteristics, thereby eliminating the vapor pressure problem while maintaining the benefit of utilizing biomass-derived ethanol.
Solution Approach 2:
The patent changes the chemical composition parameters of the fuel by converting ethanol and ethylene into liquid hydrocarbons with specific carbon chain lengths. This parameter change transforms the fuel's vapor pressure characteristics from unacceptable (high) to acceptable, while maintaining high renewable content.
3Manufacturing precision
If high purity ethylene is produced from ethane through conventional processes, then feedstock purity for chemical production is achieved, but capital expense increases
Solution Approach 1:
The patent applies partial action by producing low-purity ethylene (30-60 wt%) directly from ethane through simple thermal cracking, which is then immediately converted catalytically. This partial purification approach eliminates the need for expensive high-purity separation equipment while the subsequent catalytic conversion tolerates and processes the low-purity ethylene effectively.
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 achieves high efficiency in ethane conversion to liquid fuels like gasoline and diesel, while allowing increased ethanol incorporation without exceeding vapor pressure limits, ensuring compatibility with all gasoline-powered vehicles and optimizing energy use.
Implementation Method 1
thermal activation (or cracking) of ethane to an intermediate, low purity raw ethylene stream
Implementation Method 2
contacting the mixture with a catalyst to produce a mixed product stream comprising an increased percentage of hydrocarbons containing four or more carbon atoms
Implementation Method 3
introducing at least part of the light hydrocarbon stream into a hydrogenation reactor to saturate unconverted olefins, thereby producing a mixture of light paraffin components and hydrogen gas
Implementation Method 4
separating the mixed product stream to produce an intermediate hydrocarbon stream comprising hydrocarbons containing four or more carbon atoms and a light hydrocarbon stream comprising hydrocarbons containing from one to three carbon atoms
Data Source
AI summary
Processes relating to thermal activation (or cracking) of ethane to an intermediate, low purity raw ethylene stream in a first stage. This stream is then mixed with a stream of biomass-derived ethanol that may contain four volume percent or more of water. The resulting mixture is reacted over a suitable catalyst at temperatures and pressures suitable to produce gasoline-range and diesel-range blend stock.