Dividing Wall Fractionation Column for Naphtha Separation
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Solution Overview
Problem
Current processes for producing ethylene and propylene from naphtha have low yields, with less than 60% ethylene and propylene production by weight, and inefficient separation of ethane and propane from naphtha-to-ethane-and-propane reactor effluents, limiting the production of high-value petrochemicals.
Innovation Solution
A process utilizing a dividing wall fractionation column in the naphtha-to-ethane-and-propane processing unit to efficiently separate hydrogen, methane, ethane, and propane, with shared refrigeration systems and coldbox heat exchangers, optimizing the separation and recycling of ethane and propane to enhance ethylene and propylene production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional fractionation columns are used to separate ethane and propane from reactor effluent, then the separation can be achieved, but the energy consumption is high and the production efficiency is low
Solution Approach 1:
The patent combines the deethanizer and depropanizer into a single dividing wall fractionation column, merging two separate separation processes into one integrated system. This reduces the total number of columns from two to one, thereby lowering energy consumption while maintaining high productivity in ethylene and propylene production
2Manufacturing precision
If multiple separate fractionation columns are used for component separation, then complete separation can be achieved, but the device complexity and capital cost increase
Solution Approach 1:
The patent merges the functionality of multiple separate fractionation columns into a single dividing wall fractionation column. The dividing wall internally partitions the column to create separate separation zones, achieving the same separation purity as multiple columns would provide, but with reduced device complexity and lower capital cost
3Adaptability or versatility
If conventional separation processes are used without integration, then the process is simpler to implement, but the carbon efficiency and overall production effectiveness are reduced
Solution Approach 1:
The dividing wall fractionation column is designed to perform multiple separation functions simultaneously - separating ethane from lighter components in the upper section and propane from heavier components in the lower section. This multi-functional design improves carbon efficiency and production effectiveness while maintaining flexibility in producing high-value olefins like ethylene and propylene
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 increases the efficiency of ethylene and propylene production, reduces energy consumption by 15% compared to traditional systems, and enhances carbon efficiency, making the process more cost-effective and flexible in producing high-value olefins.
Implementation Method 1
dividing wall fractionation column efficiently separate the effluent stream into a hydrogen and methane rich stream, an ethane rich stream, and a propane rich stream with residual C4+ hydrocarbons
Implementation Method 2
coldbox (cryogenic) exchangers
Data Source
AI summary
In a process of producing ethylene and propylene from naphtha the process a feed stream comprising hydrogen, methane, ethane, and propane and residual C4+ from a naphtha-to-ethane-and-propane reactor is fed to a dividing wall fractionation column.