Metalized Resin Catalyst Dimer Selectivity vs Corrosion
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Solution Overview
Problem
Existing isoolefin dimerization processes face issues with acid loss from catalysts, leading to corrosion of reactor vessels and associated equipment due to the presence of water-soluble components and elevated temperatures.
Innovation Solution
A process using a metalized resin catalyst, specifically a sulfonated macroporous resin or solid phosphoric acid catalyst, where at least 50% of the acid groups are neutralized with metals like Al, Fe, Zn, or Cu, and contacted with an isoolefin and a reaction moderator such as an ether or alcohol to reduce acid loss and corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If water-soluble components are used as reaction moderators in isoolefin dimerization, then dimer selectivity is improved, but acid loss from catalyst increases causing corrosion
Solution Approach 1:
A solid support material (such as silica gel, alumina, or activated carbon) is introduced as an intermediary carrier to hold the acid catalyst. This mediator allows the catalyst to function while preventing direct contact between the acid and corrosive aqueous environment, thus maintaining dimer selectivity while reducing corrosion of reactor vessels and piping
Solution Approach 2:
The catalyst is formulated as a composite material combining the acid catalyst with a solid support matrix. This composite structure provides both the catalytic activity needed for high dimer selectivity and the structural stability to resist acid loss and corrosion under reaction conditions with water-soluble moderators
2Productivity
If elevated temperatures are used in the dimerization reaction, then reaction rate is improved, but acid loss from catalyst increases
Solution Approach 1:
The acid catalyst is pre-immobilized onto a solid support material before the reaction begins. This preliminary anchoring of the acid groups to the solid matrix prevents their loss during elevated temperature operation, allowing the reaction to proceed at higher temperatures with improved productivity while maintaining catalyst stability
Solution Approach 2:
A porous solid support material is used to provide a high surface area for anchoring acid catalyst groups. The porous structure allows reactants to access the catalytic sites at elevated temperatures while the robust solid framework prevents acid loss, thus enabling high reaction rates without catalyst degradation
3Productivity
If acid catalyst is used for isoolefin dimerization, then catalytic activity is maintained, but corrosion of reactor vessels occurs
Solution Approach 1:
The solid support material acts as an intermediary between the acid catalyst and the reactor environment. It maintains the catalytic activity of the acid groups while serving as a protective barrier that prevents acid loss and subsequent corrosion of reactor vessels and associated piping
Solution Approach 2:
The system transitions from using free acid catalyst (which causes corrosion) to using acid catalyst immobilized on solid support (which prevents corrosion). This substitution replaces the harmful mechanical/chemical interaction between free acid and reactor equipment with a stable solid-phase catalyst system that maintains activity without corrosion
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 metalized resin catalysts achieve high selectivity for dimer production while minimizing acid loss, reducing corrosion risks and maintaining catalyst stability even at elevated temperatures.
Implementation Method 1
at least 50% to less than 100% of acid groups in the solid catalyst composition are neutralized with a metal of Al, Fe, Zn, Cu, Ni, or mixtures thereof
Implementation Method 2
contacting an isoolefin with a solid catalyst composition passivated with at least one of an ether, an alcohol, and water; wherein the solid catalyst composition comprises at least one of a solid phosphoric acid catalyst and a resin
Data Source
AI summary
A process for the dimerization of isoolefins, including: contacting an isoolefin with a solid catalyst composition passivated with at least one of an ether, an alcohol, and water; wherein the solid catalyst composition comprises at least one of a solid phosphoric acid catalyst and a resin of a macroporous matrix of polyvinyl aromatic compound crosslinked with a divinyl compound and having thereon from about 3 to 5 milli equivalents of sulfonic acid groups per gram of dry resin; and wherein at least 50% to less than 100% of acid groups in the solid catalyst composition are neutralized with a metal of Al, Fe, Zn, Cu, Ni, or mixtures thereof. The catalyst may be metalized prior to placement in a reactor or may be metalized in situ.