Isomerization Catalyst Activation via HCl Recovery
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Solution Overview
Problem
Current isomerization processes for paraffins require continuous addition of expensive chloride promoters and caustics, posing environmental and cost concerns due to hydrogen chloride handling and consumption.
Innovation Solution
The method involves separating isomerization effluent to form a HCl and H2-rich stream, which is used to activate the isomerization catalyst, reducing the need for chloride promoters and caustic consumption by recycling HCl and H2, and minimizing hydrogen usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If continuous addition of chloride promoter is used to maintain catalyst activity, then isomerization process continues, but chloride promoter consumption increases operational costs
Solution Approach 1:
The patent recovers HCl from the stabilizer overhead vapor stream (which would otherwise be discarded) and reinjects it into the reactor to maintain catalyst chlorination. This recovers a valuable substance (HCl) from waste stream and reuses it for catalyst activation, reducing the need for continuous chloride promoter addition while maintaining process continuity
Solution Approach 2:
The patent implements a feedback loop where HCl is continuously monitored in the stabilizer overhead vapor stream and reinjected into the reactor based on its concentration. This closed-loop feedback system automatically adjusts catalyst chlorination levels, maintaining optimal catalyst activity while minimizing excess chloride promoter consumption
2Object-affected harmful factors
If stabilizer overhead vapor stream is scrubbed with caustic to neutralize HCl, then environmental concerns are addressed, but caustic consumption increases operational costs
Solution Approach 1:
The patent converts the harmful HCl in the stabilizer overhead vapor stream into a beneficial substance by reinjecting it into the reactor where it serves to chlorinate and activate the catalyst. This transforms an environmental hazard requiring expensive caustic treatment into a valuable catalyst activator, eliminating caustic consumption while addressing environmental concerns
Solution Approach 2:
The system makes the HCl waste stream serve the dual purpose of catalyst activation and environmental protection. By reinjecting HCl into the reactor, the system self-regulates catalyst chlorination levels while simultaneously reducing the need for caustic scrubbing, making the process self-sufficient and reducing external chemical consumption
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 decreases chloride promoter and caustic consumption, enhancing process efficiency and reducing operational costs while effectively isomerizing paraffins.
Implementation Method 1
An isomerization catalyst is activated using at least a portion of the HCl and H2-rich stream to form a chloride-promoted isomerization catalyst
Implementation Method 2
Inside the reactor, the chloride promoter decomposes to form hydrogen chloride that activates, e.g., promotes or regenerates, the catalyst
Data Source
AI summary
Embodiments of methods and apparatuses for isomerization of paraffins are provided. In one example, a method comprises the steps of separating an isomerization effluent into a product stream that comprises branched paraffins and a stabilizer overhead vapor stream that comprises HCl, H2, and C6-hydrocarbons. C6-hydrocarbons are removed from at least a portion of the stabilizer overhead vapor stream to form a HCl and H2-rich stream. An isomerization catalyst is activated using at least a portion of the HCl and H2-rich stream to form a chloride-promoted isomerization catalyst. A paraffin feed stream is contacted with the chloride-promoted isomerization catalyst in the presence of hydrogen for isomerization of the paraffins.