Heat Pump Distillation Column for High Purity Bottoms
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Solution Overview
Problem
Distillation systems in the petroleum industry are energy-intensive and inefficient, particularly when separating hydrocarbon components with similar boiling points, leading to high energy consumption and increased CO2 emissions.
Innovation Solution
The process involves using heat from overhead and intermediate vapor streams to reboil the bottoms stream in a distillation column, reducing the need for external energy by compressing these vapor streams with heat pump compressors and recycling them back into the column, thereby reducing the energy required for reboiling and improving the purity of the bottoms product.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional distillation is used to separate hydrocarbons with similar boiling points, then separation can be achieved, but energy consumption is excessively high
Solution Approach 1:
The patent changes the pressure parameter of the bottoms stream by passing it through a pressure reducing valve, allowing the stream to be vaporized at lower temperatures and enabling heat exchange with overhead vapor streams, thereby reducing external energy requirements while maintaining separation purity
Solution Approach 2:
The patent introduces an intermediary heat exchange system where the pressure-reduced bottoms stream exchanges heat with overhead vapor streams through heat exchangers, transferring thermal energy within the system to reduce the need for external heating while achieving the required separation
2Manufacturing precision
If more stages are added to the distillation column to improve separation, then product purity increases, but device complexity and energy consumption increase
Solution Approach 1:
By changing the pressure parameter of the bottoms stream and using heat pump compression, the patent achieves more efficient mass and heat transfer, reducing the number of theoretical stages needed while maintaining high bottoms product purity
3Productivity
If external energy is added to reboil the bottoms stream, then vapor generation increases, but energy efficiency decreases
Solution Approach 1:
The patent enables the distillation system to be self-sufficient by using the overhead vapor streams themselves to provide the heat needed to vaporize the bottoms stream through heat exchange, eliminating the need for external energy input while maintaining adequate vapor generation for the distillation process
Solution Approach 2:
The patent uses overhead vapor streams as an intermediary heat source, transferring thermal energy from the vapor phase to the liquid bottoms stream through heat exchangers, thereby generating the required vapor without external energy addition
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 significantly decreases external energy consumption and enhances the efficiency of the distillation process, especially for mixtures with close boiling points, by reducing the number of stages needed and minimizing additional energy input, thus lowering operational costs and environmental impact.
Implementation Method 1
The vaporized bottoms stream is compressed through a heat pump compressor, thereby adding heat and bringing the stream to at least the column pressure
Implementation Method 2
a portion of the bottoms liquid stream is drawn off and passed through a pressure reducing valve. This reduced pressure liquid is heat exchanged with a portion of the overhead vapor stream
Implementation Method 3
This reduced pressure liquid is heat exchanged with a portion of the overhead vapor stream, thereby creating a vaporized bottoms stream and a condensed overhead stream
Implementation Method 4
creating a vaporized bottoms stream and a condensed overhead stream
Implementation Method 5
thereby creating a vaporized bottoms stream
Implementation Method 6
Distillation is a method of separation that is based on a difference in the relative volatilities of the components in a mixture, and therefore differences in the composition between a liquid mixture and a vapor formed from the liquid mixture
Data Source
AI summary
A process for reducing the energy consumption of a distillation column is disclosed. The process includes drawing off an intermediate vapor stream from the rectification section of the distillation column. The vapor stream is compressed and the heat in the vapor stream is exchanged with a portion of the liquid bottoms stream. The heat transfer condenses a portion of the vapor stream, while vaporizing the liquid bottoms stream.