Linear Alpha Olefin Distillation With Direct Fraction Routing
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Solution Overview
Problem
Existing methods for separating linear alpha olefins are energy-intensive and result in impure products due to the high energy consumption and presence of impurities, making it difficult to meet industry purity standards.
Innovation Solution
A modified sequence of distillation columns is used, where a C8- fraction is passed directly to the top of a second column, and a C9+ fraction is passed directly to the bottom of the second column, bypassing the condenser and reboiler of the first column, with a side draw for the C10 fraction, allowing for efficient separation and reduced energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional distillation columns with reboiler and condenser are used to separate linear alpha olefins, then separation can be achieved, but energy consumption is high and product purity is insufficient
Solution Approach 1:
The separation process is divided into multiple distillation columns operating in series, each targeting specific carbon number ranges (C4-C6, C8-C10, C12-C14, C16-C20). This segmentation allows each column to focus on a narrower separation range, improving purity while optimizing energy use through targeted separation rather than attempting to separate all components in a single column.
Solution Approach 2:
The process performs preliminary separation by removing light hydrocarbons (C4-C6) and heavy fractions (C12+) in early stages, preparing the feed for subsequent columns that focus on isolating specific target products like C8 and C10 alpha olefins. This preliminary action reduces the complexity and energy demand of later separation stages.
2Manufacturing precision
If direct sequence of two distillation columns is used to separate decene, then separation can be achieved, but reboiler duty and condenser duty are high
Solution Approach 1:
The decene separation is integrated into a multi-column system where each column handles specific carbon ranges. The C8-C10 column specifically targets decene isolation, while other columns handle adjacent carbon numbers, segmenting the total separation task to reduce the energy burden on any single column's reboiler and condenser.
Solution Approach 2:
The process introduces multiple separation dimensions by operating parallel distillation trains and using side-draw techniques to extract specific fractions at optimal points in the distillation sequence, adding complexity in process arrangement to reduce energy consumption in individual units.
3Manufacturing precision
If conventional distillation is used to separate linear alpha olefins with narrow boiling point range, then separation can be achieved, but the process is difficult and energy intensive
Solution Approach 1:
The complex separation of narrow boiling point range olefins is broken down into multiple columns, each handling a specific carbon number range. This segmentation transforms one highly complex separation task into several simpler, more manageable separations, reducing the complexity within each individual column while achieving overall high purity.
Solution Approach 2:
Preliminary removal of extreme components (light ends and heavy ends) in separate columns prepares the feed for the main separation columns, simplifying the separation task for columns dealing with the narrow boiling point range components and reducing the overall process difficulty.
4Manufacturing precision
If multiple distillation columns are used to separate various fractions, then product purity can be improved, but capital costs increase
Solution Approach 1:
The multi-column arrangement segments the separation task so that each column produces a specific fraction with marketable purity. This segmentation allows for targeted production of valuable products (C4-C6, C8-C10, C12-C14, C16-C20) at optimal purity levels, balancing capital investment against product value and avoiding over-purification that would increase costs without adding value.
Solution Approach 2:
Each distillation column is designed to serve multiple purposes: separating target fractions, providing feed for subsequent columns, and enabling flexible operation to meet different market demands. This multi-functionality justifies the capital investment by maximizing the utility of each column throughout the separation sequence.
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 method achieves a 20% reduction in energy consumption, maintains high product purity (≥99.5%), and reduces capital costs by simplifying the separation process.
Implementation Method 1
A modified sequence of distillation columns is used, where a C8- fraction is passed directly to the top of a second column, and a C9+ fraction is passed directly to the bottom of the second column
Implementation Method 2
passing a feed stream comprising C4-C20 linear alpha olefins through a first column
Implementation Method 3
bypassing the condenser and reboiler of the first column
Data Source
Figure 1
Figure 2
AI summary
A method of separating linear alpha olefins includes: passing a feed stream comprising linear alpha olefins through a first column; distributing a C8- fraction to a top portion of the first column; distributing a C9+ fraction to a bottom portion of the first column; passing the C8- fraction directly to a top portion of a second column; passing the C9+ fraction directly to a bottom portion of a second column; distributing a C11+ fraction to the bottom portion of the second column; withdrawing a C10 fraction as a side draw from the second column; and passing a liquid stream and a vapor stream from the second column to the first column.