Linear Alpha Olefin Separation via Segmented Distillation
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Solution Overview
Problem
The distillation of oligomerization products, which often contain a mixture of hydrocarbons and dissolved polymers, requires costly customization of distillation columns to handle polymers, affecting overall efficiency and increasing costs due to the need for special materials and extended bottom portions to prevent polymer settling.
Innovation Solution
A method involving a series of distillation columns where only a minimal number are modified to handle polymers, allowing for the separation of linear alpha olefins into pure fractions with high purity, using a feed stream that includes a mixture of hydrocarbons and dissolved polymers, without the need for special materials or extended column bottoms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all distillation columns are customized to handle polymers with special materials and extended bottom portions, then polymer settling is prevented, but equipment cost and process complexity increase significantly
Solution Approach 1:
The distillation process is divided into multiple sequential columns, each handling specific fraction ranges. Only the first column processes the full feed stream containing polymers, while subsequent columns handle already-separated fractions that are substantially free of polymers, eliminating the need for all columns to be polymer-resistant
Solution Approach 2:
The first distillation column performs preliminary separation to remove polymers and heavy fractions (C12+) from the feed stream before the mixture enters subsequent columns. This preliminary action ensures that downstream columns receive polymer-free streams, allowing them to use standard construction
2Reliability
If all distillation columns use special heat-resistant materials and extended bottoms, then polymer handling capability is ensured, but manufacturing cost increases
Solution Approach 1:
The system segments polymer handling requirements to only the first column, which processes the polymer-containing feed stream. Subsequent columns process purified fractions and can be manufactured with standard materials, significantly reducing overall manufacturing cost
Solution Approach 2:
Special polymer-resistant properties are applied locally only where necessary (first column), while downstream columns use standard construction, optimizing material selection to match actual process requirements at each stage
3Manufacturing precision
If multiple distillation columns are used to achieve high purity fractions, then separation precision improves, but the number of polymer-modified columns increases
Solution Approach 1:
The separation train is segmented into multiple columns, each targeting specific carbon number ranges. This segmentation allows polymers to be removed in early stages while enabling precise fractionation in later stages with standard columns
Solution Approach 2:
Early columns perform preliminary removal of polymers and broad fraction separation, enabling subsequent columns to focus on precise purification of specific ranges without polymer interference, achieving high purity with standard equipment
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 achieves high purity fractions (≥99% weight) with reduced costs and column modifications, as only a few columns need to be capable of handling polymers, and the rest can operate without high-temperature resistant materials or extended bottoms, maintaining efficiency while minimizing expenses.
Implementation Method 1
Distillation works via the application and removal of heat to exploit differences in relative volatility. The heat causes components with lower boiling points and higher volatility to be vaporized, leaving less volatile components as liquids.
Implementation Method 2
The heat causes components with lower boiling points and higher volatility to be vaporized, leaving less volatile components as liquids.
Data Source
Figure 1
AI summary
A method of separating linear alpha olefins, comprising: passing a feed stream comprising linear alpha olefins through a first column; distributing a C4- fraction to a top portion of the first column; withdrawing a C6+ fraction from a bottom portion of the first column and passing the C6+ fraction through a second column; distributing a C12+ fraction to a bottom portion of the second column; withdrawing a C10- fraction from a top portion of the second column and passing the C10- fraction through a third column, wherein the C10- fraction is substantially free of polymer; and distributing a C6 fraction to a top portion of the third column.