Absorption Refrigeration Cooling for Polyolefin Distillation Energy
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Solution Overview
Problem
The production of polyolefins is an energy-intensive process, consuming significant amounts of electricity, steam, and fuel gas, which contributes substantially to production costs and energy consumption.
Innovation Solution
A process involving the use of an absorption refrigeration cycle to cool and separate hydrocarbon-containing streams from the effluent of olefin polymerization, allowing for the recycling of thermal energy and optimizing distillation conditions to recover olefin monomers and diluents efficiently, thereby reducing energy consumption and enhancing hydrocarbon recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional separation processes are used for hydrocarbon streams, then separation is achieved, but energy consumption is high
Solution Approach 1:
The patent employs phase transitions through absorption refrigeration cycles to cool overhead vapor streams, enabling condensation of hydrocarbons at lower temperatures. This approach replaces conventional high-energy cooling methods, achieving separation while significantly reducing energy consumption through thermodynamically efficient phase change processes.
Solution Approach 2:
The invention changes temperature parameters by using absorption refrigeration to cool streams to specific temperature ranges (e.g., -20°C to -40°C), optimizing the separation process. By adjusting temperature parameters through refrigeration cycles, the system achieves efficient hydrocarbon separation while minimizing energy input compared to conventional thermal separation methods.
2Loss of energy
If thermal energy is not recovered, then process simplicity is maintained, but energy efficiency is low
Solution Approach 1:
The patent implements feedback loops where overhead vapor streams from distillation columns are routed to absorption refrigeration units, and the resulting cold streams are fed back into the distillation process as reflux or cooling media. This closed-loop feedback system recovers thermal energy that would otherwise be wasted, improving overall energy efficiency while integrating seamlessly into the existing process flow.
Solution Approach 2:
The absorption refrigeration system is designed to serve itself by using waste thermal energy from the distillation process to drive the refrigeration cycles. The system recovers its own cooling requirements from the process waste heat, creating a self-sustaining energy recovery mechanism that reduces external energy input without requiring complex external utility systems.
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 process increases energy efficiency in polyolefin production, reduces energy consumption, and improves plant efficiency by recycling wasted energy resources, leading to cost savings and enhanced hydrocarbon recovery.
Implementation Method 1
cooling the temperature of the overhead vapor stream using an absorption refrigeration cycle
Implementation Method 2
recycling of thermal energy and optimizing distillation conditions
Implementation Method 3
optimizing distillation conditions to recover olefin monomers and diluents efficiently
Data Source
AI summary
A process for separation of a hydrocarbon-containing feed stream can include cooling the hydrocarbon-containing feed stream using an absorption refrigeration cycle to form a cooled feed stream. The cooled feed stream can be subjected to distillation conditions to remove a bottom stream including co-monomer; and an overhead stream including hydrocarbon diluents, olefin monomer, and components selected from H2, N2, O2, CO, CO2, and formaldehyde. The overhead stream can be subjected to distillation conditions adapted to remove a bottom stream including substantially olefin-free hydrocarbon diluents; a side stream including hydrocarbon diluent; and an overhead vapor stream including olefin monomer, diluents, and components selected from H2, N2, O2, CO, CO2, and formaldehyde. The overhead vapor stream can be cooled using an absorption refrigeration cycle to form a cooled overhead vapor stream. Olefin monomers can be separated from diluents in the cooled overhead vapor stream.