Simultaneous Isomerization Disproportionation for N-Pentane Yield
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Solution Overview
Problem
Conventional hydrocarbon processing techniques struggle to efficiently produce n-pentane and isobutane from isopentane and n-butane without requiring additional operating units, which is necessary to minimize Reid Vapor Pressure (RVP) in gasoline products while maintaining desirable octane values.
Innovation Solution
A process involving the simultaneous disproportionation and isomerization of an iC5/nC4 feed stream in an isomerization zone, using a hydrocarbon feed stream that includes C4 and C5 hydrocarbons, to produce intermediate streams containing C3-C6 hydrocarbons, thereby increasing the yield of n-pentane and isobutane without adding extra units to the hydrocarbon processing apparatus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If isopentane content is increased in gasoline products to maintain octane values, then octane value is improved, but Reid Vapor Pressure (RVP) increases
Solution Approach 1:
The patent applies parameter changes by modifying the isomerization reaction conditions (temperature, pressure, catalyst type, space velocity) to alter the product distribution between isopentane and n-pentane. By adjusting these parameters, the process optimizes the balance between octane value (from isopentane) and RVP (reduced by n-pentane), achieving both goals simultaneously through controlled chemical transformation rather than simple blending.
2Productivity
If additional operating units are added to convert isopentane to n-pentane, then n-pentane yield increases and RVP decreases, but device complexity increases
Solution Approach 1:
The patent applies universality by designing an isomerization unit that performs multiple functions: it converts n-butane to isobutane, converts isopentane to n-pentane, and optimizes the overall C5 hydrocarbon distribution. This multi-functional approach eliminates the need for separate conversion units, reducing device complexity while achieving high n-pentane yield and RVP control through integrated catalytic isomerization.
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 allows for increased production of n-pentane and isobutane, reducing isopentane content and minimizing RVP in gasoline products, while maintaining octane values, without the need for additional operating units, thereby optimizing hydrocarbon processing efficiency.
Implementation Method 1
The combined feed stream is separated to produce an iC4 product stream, an nC5+ product stream, and an iC5/nC4 feed stream. The iC5/nC4 feed stream is simultaneously disproportionated and isomerized in an isomerization zone to produce an intermediate stream that includes C3-C6 hydrocarbons.
Implementation Method 2
The iC5/nC4 feed stream is simultaneously disproportionated and isomerized in an isomerization zone to produce an intermediate stream that includes C3-C6 hydrocarbons.
Data Source
AI summary
Hydrocarbon processing apparatuses and processes for producing n-pentane and isobutane are provided herein. In an embodiment, a process for producing n-pentane and isobutane includes providing a hydrocarbon feed stream that includes C4 and C5 hydrocarbons. A recycle stream that includes C4+ hydrocarbons and the hydrocarbon feed stream is combined to produce a combined feed stream. The combined feed stream is separated to produce an iC4 product stream, an nC5+ product stream, and an iC5/nC4 feed stream. The iC5/nC4 feed stream is simultaneously disproportionated and isomerized in an isomerization zone to produce an intermediate stream that includes C3-C6 hydrocarbons. The C3-C6 hydrocarbons in the intermediate stream are separated to produce a C3− stream and the recycle stream that includes C4+ hydrocarbons.