Oligomerization Feed Composition for Gasoline Yield
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Solution Overview
Problem
Current catalysts for oligomerizing light olefins struggle to produce high-quality gasoline and diesel efficiently, as they either produce highly branched gasoline or linear diesel, leading to suboptimal yields and product quality, and face challenges in maximizing propylene production while minimizing heavier oligomer formation.
Innovation Solution
Incorporating C5 olefins into the oligomerization feed stream over a uni-dimensional, ten-ring pore zeolite catalyst, which reduces the production of heavier oligomers and increases gasoline yield while maintaining a liquid phase in the reactor, thereby enhancing catalyst stability and olefin concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If catalysts are used to make high octane gasoline through oligomerization, then gasoline quality is improved, but the product becomes highly branched and undesirable for diesel production
Solution Approach 1:
The patent changes the chemical composition parameter of the feed stream by adding C5 olefins to C4 olefins. This parameter change modifies the oligomerization reaction pathway, producing a product mixture with both branched and linear components, thereby achieving high octane gasoline while retaining some diesel-quality linear material
2Manufacturing precision
If catalysts are used to make high cetane diesel through oligomerization, then diesel quality is improved, but gasoline yield decreases due to more linear product with lower octane value
Solution Approach 1:
By changing the feed composition parameter to include C5 olefins, the reaction produces a balanced product distribution where C9 olefins (gasoline range) are favored over heavier C12+ oligomers (diesel range), thereby maintaining gasoline yield while producing acceptable diesel-quality material
3Productivity
If oligomerization is used to maximize propylene production, then propylene yield is improved, but heavier oligomers resistant to cracking are formed
Solution Approach 1:
The patent changes the molecular weight parameter of the oligomerization products by controlling the feed composition to favor C9 olefins over heavier oligomers. These C9 products are more readily cracked to propylene in the FCC unit, reducing the formation of refractory heavy materials that resist cracking
4Quantity of substance
If C4 olefins are oligomerized to produce gasoline, then gasoline is produced, but trimerization and higher oligomerization produce material heavier than gasoline such as diesel
Solution Approach 1:
By changing the feed composition to include C5 olefins, the patent shifts the product distribution parameter to favor C9 olefins (gasoline range) over C12+ oligomers (diesel range). This parameter change achieves high gasoline yield while maintaining product specification by minimizing heavy distillate 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
This approach effectively increases gasoline yield and reduces distillate production, achieving higher octane values for gasoline and optimizing propylene production by mitigating further oligomerization of C9 olefins, resulting in a more efficient and balanced product distribution.
Implementation Method 1
oligomerization of butenes to make gasoline range material while minimizing production of heavier olefins
Implementation Method 2
over a uni-dimensional, ten-ring pore zeolite catalyst
Implementation Method 3
A liquid phase helps with catalyst stability by acting as a solvent to wash the catalyst of heavier species produced
Implementation Method 4
typically, this liquid phase in the reactor is maintained by hydrogenating some of the heavy olefinic product and recycling this paraffinic product to the reactor inlet
Data Source
AI summary
Disclosed is the addition of C5 olefins to oligomerization feed stream has the counterintuitive effect of reducing the production of heavier oligomers over a uni-dimensional, ten-ring pore zeolite. Consequently, C5 olefins can be added to C4 olefins in an oligomerization feed stream to produce more gasoline and less distillate.