Chlorinated Catalyst Recycling in C5/C6 Isomerization
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Solution Overview
Problem
Existing hydrocarbon isomerization processes using chlorinated catalysts face issues with chlorine elution leading to corrosion, deposit formation, and catalyst contamination, which reduces the overall yield of high octane number products and requires continuous chlorination and recycling of hydrogen chloride.
Innovation Solution
A process involving an isomerization unit with a chlorinated catalyst, a stabilization unit for separating gaseous and liquid effluents, and an absorption unit for recycling chlorinated compounds using a washing fluid, optimizing the recycling of chlorinated compounds and maintaining a high yield of high octane number products without increasing the chlorinated compound recycle ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If chlorinated catalysts are used for isomerization to increase octane number, then isomerization activity is improved, but chlorine elution causes corrosion and contamination
Solution Approach 1:
The harmful chlorinated compounds are extracted from the effluent stream using an absorption unit where a washing liquid selectively absorbs chlorine-containing substances. This separates the beneficial isomerization products from the harmful chlorinated byproducts, allowing the former to proceed to high octane number products while the latter are neutralized or recycled.
Solution Approach 2:
A washing liquid acts as an intermediary substance between the chlorinated catalyst system and the downstream equipment. This intermediary absorbs the harmful chlorine compounds through chemical or physical interaction, preventing direct contact between chlorinated compounds and corrosion-prone equipment while maintaining the isomerization process integrity.
2Duration of action of stationary object
If chlorinated compounds are continuously recycled to maintain catalyst activity, then catalyst stability is improved, but losses of upgradable hydrocarbons increase
Solution Approach 1:
The effluent stream is segmented into different components through the absorption unit, separating chlorinated compounds from hydrocarbon products. This segmentation allows selective treatment of harmful substances while preserving valuable hydrocarbons for recycling or product recovery, preventing unnecessary losses.
Solution Approach 2:
The absorption process changes the composition parameters of the effluent stream by selectively removing chlorinated compounds. This parameter change enables the recycled stream to have optimized composition, maintaining catalyst stability requirements while minimizing hydrocarbon losses through selective rather than blanket recycling.
3Object-affected harmful factors
If absorption units are added to remove chlorinated compounds, then corrosion is reduced, but device complexity increases
Solution Approach 1:
The washing liquid serves multiple functions: it absorbs chlorinated compounds for corrosion protection, can be regenerated for continued use, and may facilitate hydrocarbon recovery. This multi-functionality justifies the added device complexity by providing several benefits from a single unit.
Solution Approach 2:
Rather than simply discarding the washing liquid after one use, the system recovers and regenerates it, allowing continuous operation of the absorption unit. This recovery approach reduces the need for additional equipment and minimizes waste, offsetting the initial complexity increase.
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 process enhances the yield of high octane number products while minimizing the recycling of unwanted compounds and reducing losses of upgradable hydrocarbons, thereby improving the overall efficiency and reducing corrosion and contamination issues.
Implementation Method 1
an absorption unit for recycling the chlorinated compounds
Implementation Method 2
a stabilization unit for separating gaseous and liquid effluents
Data Source
AI summary
A process for the isomerization of a feed of hydrocarbon compounds containing C5 and/or C hydrocarbon compounds, comprising: a) supplying an isomerization unit with at least one liquid fraction of the feed of hydrocarbon compounds and isomerizing the feed in the presence of a chlorinated catalyst; b) supplying a stabilization unit containing at least one stabilization column with the effluent obtained from the isomerization unit and separating the effluent; c) providing an absorption unit having one absorption column; d) extracting a liquid flow enriched in chlorinated compounds from the absorption unit which is recycled to the isomerization unit; and e) extracting the liquid flow containing at least one isomerate from the stabilization unit.