Fuel Additive Production via C4 Hydrocarbon Conversion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The conversion of crude hydrocarbon streams to fuel additive products is often inefficient and costly, resulting in final products with high impurities and undesirable specifications that fail to meet market quality requirements.
Innovation Solution
A method involving a unique sequence of unit operations that converts crude hydrocarbons into valuable fuel additives, such as alcohol fuel additives, by maximizing the production of 2-butene and utilizing it to produce trimethylpentane, thereby improving product specifications and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional methods are used to convert crude hydrocarbon streams to fuel additive products, then the process is simpler and less costly in terms of complexity, but the final products have high impurities and fail to meet market quality requirements
Solution Approach 1:
The patent divides the conversion process into multiple distinct unit operations (reactor, distillation column, extraction unit) rather than using a single conventional process step. This segmentation allows each unit to perform a specific function with high precision, thereby improving overall product quality while managing complexity through modular design
Solution Approach 2:
The patent introduces an intermediary substance (malononitrile) and intermediary process steps (distillation, extraction) between the crude hydrocarbon feed and the final fuel additive product. These intermediaries enable selective transformation and purification, achieving high manufacturing precision by separating the conversion into controlled stages
2Productivity
If conventional conversion methods are used, then the process is faster and simpler to implement, but the efficiency of conversion is low and capital costs are high
Solution Approach 1:
The patent employs specific parameter changes including temperature control in the reactor, pressure conditions in distillation, and solvent selection in extraction. These parameter optimizations maximize conversion efficiency of crude hydrocarbons to fuel additives while the systematic approach makes the complex process easier to manufacture and scale
Solution Approach 2:
The patent implements continuous operation across all unit operations with recycle streams that maintain continuous useful action. The effluent from each unit is continuously processed through subsequent units, maximizing productivity by eliminating idle time and ensuring constant conversion efficiency throughout the process
3Manufacturing precision
If crude hydrocarbon streams are converted using existing processes, then the process requires fewer steps, but the final products have high Reid vapor pressures and low octane numbers that correlate with poor product quality
Solution Approach 1:
The patent takes out and removes unwanted components through extraction units that selectively extract impurities and unwanted hydrocarbon fractions. This extraction process specifically targets compounds that would otherwise result in high Reid vapor pressures and low octane numbers, achieving precise control over product specifications
Solution Approach 2:
The patent performs preliminary action by conducting selective reactions and pre-purification steps before the final product formation. The reactor selectively converts specific crude hydrocarbon components, and preliminary distillation removes unwanted fractions early in the process, preventing the formation of low-quality products and reducing the need for extensive downstream processing
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 method significantly improves the efficiency of the process, reducing total capital costs, and produces fuel additives with high octane numbers, low Reid vapor pressures, and low impurities, making them more valuable and meeting market quality requirements.
Implementation Method 1
hydrocarbon feed stocks can be mixed with steam and subjected to elevated temperatures (e.g., 700-900°C) in a steam cracker furnace wherein the feed stock components are cracked into various fractions
Implementation Method 2
The first process stream is then passed through a selective hydrogenation unit. This selective hydrogenation unit can convert the butadiene present in the first process stream to 2-butene
Implementation Method 3
A third process stream taken from the isomerization unit is then passed through a hydration unit to produce a fuel additive
Implementation Method 4
A third process stream taken from the isomerization unit is then passed through a hydration unit to produce a fuel additive
Data Source
AI summary
A method of producing a fuel additive includes passing a feed stream comprising C4 hydrocarbons through a methyl tertiary butyl ether unit producing a first process stream; passing the first process stream through a selective hydrogenation unit producing a second process stream; passing the second process stream through an isomerization unit producing a third process stream; and passing the third process stream through a hydration unit producing the fuel additive and a recycle stream.