Indirect Heat Pump Rectification Plant for Methylchlorosilane Purification
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Solution Overview
Problem
Existing rectification processes face challenges in achieving high purity and reducing energy consumption, especially when dealing with substances like methylchlorosilanes, due to contamination risks with direct heat pumps and high costs associated with conventional refrigerants in indirect heat pumps.
Innovation Solution
Implementing an indirect heat pump with water or methanol as a refrigerant between the overhead condenser and reboiler in a rectification plant, including an expansion valve and compressor, with a second condenser upstream of the compressor to manage energy efficiently and maintain high purity, and using shell and tube falling film evaporators for effective heat transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a direct heat pump is used to reduce energy consumption, then energy efficiency is improved, but product purity deteriorates due to contamination in the compressor
Solution Approach 1:
The patent introduces an intermediary heat transfer fluid (water or methanol) that circulates between the condenser and reboiler through a heat exchanger system. This mediator enables thermal energy transfer without direct contact between the vapor head fraction and the compressor, thus reducing energy consumption while preventing contamination of the purified product.
2Manufacturing precision
If conventional refrigerants are used in an indirect heat pump to avoid contamination, then product purity is maintained, but operational costs increase due to expensive refrigerants and large inventory requirements
Solution Approach 1:
The patent replaces expensive conventional refrigerants with inexpensive, readily available substances such as water or methanol. These substances can be easily replenished if needed and do not require large inventory investments, thereby maintaining product purity while significantly reducing operational costs.
3Manufacturing precision
If conventional refrigerants with low enthalpy of vaporization are used, then product purity is maintained, but mass-flowrates must be increased leading to larger system dimensions
Solution Approach 1:
The patent changes the key thermodynamic parameter by selecting refrigerants (water or methanol) with high enthalpy of vaporization. This parameter change allows the system to achieve the required heat transfer with lower mass-flowrates, thereby maintaining product purity while reducing the size and complexity of the heat pump system.
4Use of energy by moving object
If an indirect heat pump is used for rectification processes with low temperature difference, then energy consumption is reduced, but investment costs increase due to system complexity
Solution Approach 1:
The patent employs a simplified intermediary heat transfer system using water or methanol circulation between the condenser and reboiler. This intermediary approach reduces energy consumption while avoiding the complexity of conventional refrigerant systems, making the solution economically viable even for rectification processes with low temperature differences.
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 reduces energy consumption and operational costs while ensuring high purity of the rectification product, avoiding contamination and minimizing the need for large mass-flowrates of refrigerant, making it suitable for low temperature differences between the rectification column's head and bottom fractions.
Implementation Method 1
an indirect heat pump that is operated with water or methanol as a refrigerant
Implementation Method 2
a heat pump is provided between the first overhead condenser and the reboiler
Implementation Method 3
the indirect heat pump including an expansion valve and a compressor
Implementation Method 4
the heat pump comprises a second condenser located upstream of the compressor
Implementation Method 5
the indirect heat pump including an expansion valve and a compressor
Data Source
AI summary
A process for purifying a crude composition comprising rectifying the crude composition in a rectification plant. The rectification plant comprises a rectification column including: a first overhead condenser for condensing a head fraction, and a reboiler for evaporating a bottom fraction. A difference between a temperature of the head fraction and a temperature of the bottom fraction is less than or equal to 20° C. A heat pump is provided between the first overhead condenser and the reboiler. The heat pump is an indirect heat pump that is operated with water or methanol as a refrigerant, and the indirect heat pump includes an expansion valve and a compressor. The heat pump comprises a second condenser located upstream of the compressor.