Hydrocracking-Hydroisomerization Process for Higher Aviation Fuel Yield
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Solution Overview
Problem
Existing processes for producing aviation fuel components from renewable sources have low yield and quality, and there is a need to reduce the formation of C1-C4 hydrocarbons, especially C1-C2 hydrocarbons, while prolonging the lifetime of hydroisomerization catalysts.
Innovation Solution
A process involving hydrocracking and hydroisomerization of a paraffinic hydrocarbon feed, followed by fractionation, to produce high-quality liquid transportation fuel components, particularly aviation fuel, with adjustable yields and catalyst lifetime extension.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional hydrocracking processes are used to produce aviation fuel components from renewable sources, then fuel production is achieved, but the yield of aviation fuel components is relatively low and quality is insufficient
Solution Approach 1:
The process is divided into two distinct reaction sections: a first reaction section for hydrocracking and a second reaction section for hydroisomerisation. This segmentation allows each section to be optimized for its specific function, with the first section producing cracked effluent and the second section converting it to high-quality aviation fuel components, thereby simultaneously improving yield and quality
Solution Approach 2:
The hydrocracking effluent acts as an intermediary between the hydrocracking process and the hydroisomerisation process. This intermediary stream allows the cracked products to be further transformed in the second reaction section, enabling the production of high-quality aviation fuel components with improved yield and quality characteristics
2Productivity
If hydrocracking is performed to produce liquid fuel components, then fuel yield is improved, but formation of C1-C4 hydrocarbons (low-profit products) increases
Solution Approach 1:
The process utilizes parameter changes between two reaction sections: the first section operates under hydrocracking conditions to break down heavy molecules, while the second section operates under hydroisomerisation conditions with different temperature, pressure, and catalyst parameters to convert cracked effluent into valuable aviation fuel components, thereby improving overall yield while minimizing light gas formation
Solution Approach 2:
The process maintains continuity of useful action by immediately subjecting the hydrocracking effluent to hydroisomerisation in the second reaction section. This continuous transformation prevents the accumulation of intermediate cracked products that could otherwise form low-profit C1-C4 hydrocarbons, thereby maximizing fuel yield while minimizing waste
3Manufacturing precision
If hydroisomerisation catalyst is used in the process, then fuel quality is improved, but catalyst lifetime is reduced
Solution Approach 1:
The catalytic process is segmented into two separate reaction sections with different catalyst functions. The first section uses a hydrocracking catalyst, while the second section uses a hydroisomerisation catalyst. This segmentation protects the hydroisomerisation catalyst from harsh cracking conditions, extending its lifetime while maintaining the ability to produce high-quality aviation fuel components
Solution Approach 2:
The first reaction section acts as a cushioning stage that pre-processes the feedstock through hydrocracking before the effluent enters the second reaction section. This beforehand processing reduces the burden on the hydroisomerisation catalyst, protecting it from deactivation and extending its operational lifetime while still enabling high-quality product formation
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 enhances the yield and quality of aviation fuel components, reduces low-profit products, and extends catalyst life, allowing flexible adjustment to meet market demands and feedstock variations.
Implementation Method 1
subjecting a first reaction section feed comprising the paraffinic hydrocarbon feed, and optionally a recycle stream and/or a side cut, to hydrocracking in a first reaction section in the presence of a hydrocracking catalyst to obtain a hydrocracking effluent
Implementation Method 2
subjecting a second reaction section feed comprising the hydrocracking effluent to hydroisomerisation in a second reaction section in the presence of a hydroisomerisation catalyst to obtain a hydroisomerisation effluent
Implementation Method 3
feeding the hydroisomerisation effluent to a fractionation and recovering from the fractionation at least one or more liquid transportation fuel components
Data Source
AI summary
A process for producing at least one liquid transportation fuel component is provided. In the process, a paraffinic hydrocarbon feed is subjected as part of a first reaction section feed to hydrocracking in a first reaction section to obtain a hydrocracking effluent, which hydrocracking effluent is subjected as part of a second reaction section feed to hydroisomerisation in a second reaction section to obtain a hydroisomerisation effluent, the hydroisomerisation effluent being fed to a fractionation, from which fractionation at least one liquid transportation fuel components is recovered.