Linear Alpha Olefin Separation via Segmented Distillation
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Solution Overview
Problem
The separation of linear alpha olefins from oligomerization reactor products is challenging due to high energy consumption and contamination by impurities, making it difficult to achieve high purity levels that meet industry standards.
Innovation Solution
A modified indirect sequence of two distillation columns is used, where the heaviest component is withdrawn as a bottom product from each column, allowing for efficient separation of C10- and C12+ fractions, with specific fractions being further processed through reboilers and condensers to reduce energy consumption and maintain high purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional distillation columns are used to separate linear alpha olefins, then separation is achieved, but energy consumption is high
Solution Approach 1:
The separation process is divided into multiple sequential distillation columns, each handling a specific fraction range. The first column separates C10- from C12+, the second separates C8 from C10-, and the third separates C6 from C8. This segmentation allows each column to operate more efficiently at lower reboiler duties rather than one column handling the entire separation range.
Solution Approach 2:
The feed stream undergoes preliminary filtering to remove catalyst particles and solvents before entering the distillation system. This preliminary action prevents contamination of the separation columns and eliminates the need for additional purification steps, reducing overall energy consumption while maintaining separation efficiency.
2Manufacturing precision
If distillation columns operate at high reboiler duty to achieve separation, then purity is improved, but operating costs increase
Solution Approach 1:
By segmenting the separation into three columns with specific withdrawal points, each column operates at optimized reboiler duty levels. The first column operates at lower duty to separate the lightest fractions, subsequent columns handle progressively heavier fractions, eliminating the need for any single column to operate at excessively high duty to achieve overall separation.
Solution Approach 2:
The process utilizes controlled changes in temperature, pressure, and flow rate parameters across different columns to optimize separation at minimum energy cost. By adjusting these parameters sequentially through the column train, the system achieves high purity products without requiring any single unit to consume excessive energy.
3Manufacturing precision
If conventional separation methods are used, then linear alpha olefins are separated, but impurities contaminate the fractions
Solution Approach 1:
A filter is installed at the inlet of the distillation system to remove catalyst particles and suspended solvents from the feed stream before separation begins. This preliminary filtration action prevents impurities from entering and contaminating the separated fractions, ensuring high purity products without requiring additional purification columns.
Solution Approach 2:
The harmful impurities (catalyst particles and solvents) are extracted and removed from the system through the preliminary filtration step, separating them from the valuable linear alpha olefin fractions before the distillation process begins. This extraction prevents contamination of the final products.
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 method reduces energy consumption by over 20% and maintains high product flow rate and purity, achieving a 20% or greater reduction in operating costs without requiring new equipment.
Implementation Method 1
separation of these olefins from an oligomerization reactor product stream remains a commercially important goal
Implementation Method 2
The narrow range of boiling points and relative volatilities of the components in the stream make separation by conventional distillation difficult
Implementation Method 3
the columns can demand a high reboiler duty and a high condenser duty
Implementation Method 4
the columns can demand a high reboiler duty and a high condenser duty
Data Source
Figure 1
AI summary
A method of separating linear alpha olefins includes: passing a feed stream comprising linear alpha olefins through a first column; distributing a C10- fraction to a top portion of the first column; distributing a C12+ fraction to a bottom portion of the first column; withdrawing the C10- fraction from the top portion of the first column; passing the C10- fraction through a second column; distributing a C8 fraction to a top portion of the second column; and distributing a C10 fraction to a bottom portion of the second column; wherein any fraction withdrawn from the top portion of the first column is further separated into greater than or equal to two fractions.