Transalkylation Process with Sulfolane to Suppress Co-boilers
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Solution Overview
Problem
The production of high-purity benzene from transalkylation of C9+ aromatic hydrocarbons and toluene is hindered by the formation of co-boilers, which complicates the separation process and increases costs due to the need for additional solvent extraction steps.
Innovation Solution
Introducing sulfolane into the transalkylation reactor with the C9+ aromatic hydrocarbon feed and benzene/toluene feed suppresses the formation of co-boilers, allowing for high-purity benzene production without an intermediate solvent extraction process, even after sulfolane cessation, by optimizing the transalkylation conditions and catalyst usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional transalkylation is performed without sulfolane, then the process is simple and costs are low, but co-boilers are formed that reduce benzene purity and complicate separation
Solution Approach 1:
Sulfolane is introduced as an intermediary substance into the transalkylation reactor to suppress the formation of co-boilers. The sulfolane acts as a mediator that modifies the reaction environment, preventing the formation of unwanted by-products without requiring additional separation equipment or process steps.
Solution Approach 2:
The introduction of sulfolane changes the chemical parameters of the reaction system, specifically suppressing the formation of co-boilers through chemical interaction. This parameter change in the reaction environment enables high-purity benzene production without adding process complexity.
2Manufacturing precision
If additional solvent extraction is performed to remove co-boilers, then benzene purity is improved, but process complexity and costs increase
Solution Approach 1:
Sulfolane is introduced into the transalkylation reactor to preliminarily suppress the formation of co-boilers before any separation processes occur. This preliminary action prevents the formation of problematic by-products, eliminating the need for subsequent solvent extraction operations and maintaining operational simplicity.
Solution Approach 2:
Instead of dealing with the harmful effect of co-boiler formation after the reaction, sulfolane is used to convert the reaction environment in a way that prevents co-boiler formation altogether. This transforms the potential harm into a benefit by achieving high purity through reaction modification rather than post-processing.
3Manufacturing precision
If sulfolane is introduced to suppress co-boiler formation, then benzene purity exceeds 99%, but the process requires an additional chemical additive
Solution Approach 1:
The addition of sulfolane changes the chemical parameters of the transalkylation reaction, enabling high-purity benzene production. The small quantity of sulfolane required (50-400 ppm) represents a minimal parameter change that achieves significant purification without substantially increasing the complexity of the chemical system.
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 the production of benzene with purity exceeding 99% without additional solvent extraction, simplifying the process and reducing costs by minimizing co-boiler formation and maintaining purity improvements post-sulfolane introduction.
Implementation Method 1
contacting the C9+ aromatic feed, the sulfolane, and the at least one of benzene and toluene with the transalkylation catalyst for a first period of time under transalkylation conditions
Data Source
AI summary
Co-feeding sulfolane into a transalkylation reactor along with the aromatic hydrocarbon feed(s) can improve benzene purity of the benzene product stream produced from the transalkylation product mixture, especially at the beginning phase of a catalyst cycle.