NMP Lean Solvent Split Flow for Extractive Distillation Regeneration
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Solution Overview
Problem
Existing solvent regeneration systems in extractive distillation are limited by insufficient heat transfer, restricting the feed rate of solvent to the regeneration unit.
Innovation Solution
A system that splits a high-temperature lean solvent stream into two portions, where one portion is directed to a heat exchanger for heat transfer and the other portion is retained for use in a regeneration unit, allowing simultaneous operation of both units to enhance heat transfer and increase the solvent feed rate without additional equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the solvent stream is directed entirely to the heat exchanger for heat transfer, then heat transfer efficiency is improved, but the regeneration unit receives insufficient heat and cannot process high feed rates
Solution Approach 1:
The solvent stream is divided into two separate streams: a first portion directed to the heat exchanger for heat transfer, and a second portion directed to the regeneration unit for solvent regeneration. This segmentation allows each unit to receive optimized flow rates - the heat exchanger receives sufficient flow for effective heat transfer, while the regeneration unit receives enough flow to maintain high processing capacity and productivity.
2Productivity
If the solvent feed rate to the regeneration unit is increased, then productivity is improved, but insufficient heat transfer limits the ability to handle higher feed rates
Solution Approach 1:
By segmenting the solvent stream into two separate flows, the system can independently optimize each path. The second portion to the regeneration unit maintains high feed rate for improved productivity, while the first portion to the heat exchanger provides sufficient heat transfer capability, resolving the limitation where heat transfer availability constrained feed rate increases.
3Productivity
If additional processing equipment is added to increase regeneration capacity, then productivity is improved, but capital expenditure and device complexity increase
Solution Approach 1:
The system dynamically adjusts the split between the first and second portions of the solvent stream based on operating conditions. This dynamic flow distribution allows the existing equipment to handle variable loads and optimize performance without requiring additional capital expenditure or increased device complexity, while still achieving high productivity.
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 configuration significantly enhances heat transfer, enabling a 23% increase in solvent regeneration capacity and feed rate, improving operational efficiency and stability in butadiene processing systems.
Implementation Method 1
transferring heat from the first portion to a solvent feed stream to produce a cooled lean solvent stream and a heated solvent feed stream
Implementation Method 2
the second portion of the high-temperature lean solvent stream retains its enthalpy for utilization within the regeneration unit
Data Source
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AI summary
Provided here are systems and methods that include facilitate regeneration of solvents for extractive distillation solvent with enhanced enthalpy. Examples include a method that includes receiving a high-temperature lean solvent stream including 1-methylpyrrolidin-2-one (NMP) and at a temperature between 145 °C and 155 °C from a degasser column. The method includes splitting the high-temperature lean solvent stream into a first portion and a second portion, transferring heat from the first portion to a solvent feed stream to produce a cooled lean solvent stream and a heated solvent feed stream, and regenerating the second portion to produce a purified lean solvent stream. The method includes directing the cooled lean solvent stream and the purified lean solvent stream to an extractive distillation zone.