Isoolefin Dimerization Using Sulfurous Acid Catalyst
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Solution Overview
Problem
Existing isoolefin oligomerization processes using acid resin catalysts require frequent shutdowns for catalyst replacement or regeneration, and the use of additives can lead to catalyst deactivation and complex separation processes.
Innovation Solution
The process involves contacting isoolefins with sulfurous acid in a catalytic distillation reactor system, where sulfurous acid is either fed directly or formed in situ, allowing for the dimerization of isoolefins at suitable temperature and pressure conditions, thereby eliminating the need for periodic shutdowns and additives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If acid resin catalysts are used for isoolefin oligomerization, then the oligomerization reaction can be performed, but periodic shutdowns are required for catalyst replacement and regeneration
Solution Approach 1:
The patent changes the chemical nature of the catalyst from solid acid resin to sulfurous acid (liquid/catalytic species in reaction medium), fundamentally altering the catalyst's stability and regeneration characteristics. This parameter change enables continuous operation without periodic shutdowns for catalyst replacement.
Solution Approach 2:
The patent employs sulfurous acid as a catalyst that can be continuously regenerated in the reaction system, replacing the need for expensive, finite-life solid acid resin catalysts that require periodic replacement. The sulfurous acid catalyst system effectively becomes a renewable, continuous-resource catalyst.
2Manufacturing precision
If additives (selectivators) are used to promote dimer selectivity, then catalyst selectivity to dimer is improved, but catalyst deactivation occurs and complicated separation processes are required
Solution Approach 1:
The patent removes the need for external additives (selectivators) by using sulfurous acid itself as the catalyst that inherently provides high dimer selectivity. This extraction of the selectivity-promoting function from separate additives to the catalyst system itself eliminates catalyst deactivation and simplifies separation processes.
Solution Approach 2:
Sulfurous acid acts as an intermediary catalyst that facilitates the dimerization reaction with high selectivity without requiring additional additives. The sulfurous acid mediates the reaction between isoolefins to produce dimers selectively, avoiding the need for separate selectivity-promoting agents that would require removal.
3Manufacturing precision
If additives are used to promote catalyst selectivity, then dimer production is enhanced, but unwanted acid throw deactivates the catalyst
Solution Approach 1:
The patent uses sulfurous acid as a renewable catalyst that does not suffer from deactivation issues. Unlike additive systems where selectivators cause acid throw and catalyst death, the sulfurous acid catalyst system maintains its activity continuously, effectively becoming a non-consumable, stable catalytic species.
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 enables continuous operation with improved catalyst longevity, reduced capital and operating costs, and simplified separation processes, while maintaining high selectivity for dimer production.
Implementation Method 1
contacting the at least one of isobutene and isoamylene with the sulfurous acid in the at least one reaction zone at conditions of temperature and pressure sufficient to dimerize at least a portion of the isobutene and isoamylene to C8 to C10 hydrocarbons
Implementation Method 2
separating the hydrocarbon mixture into a light hydrocarbon fraction comprising C4 to C5 hydrocarbons including any unreacted isobutene and isoamylene and a heavy fraction comprising the C8 to C10 hydrocarbons
Data Source
AI summary
A process for the dimerization of isoolefins is disclosed. The process may include: contacting an isoolefin with sulfurous acid in a reaction zone at conditions of temperature and pressure sufficient to dimerize at least a portion of the isoolefin.