MEG Regeneration via Steam Ejector Vacuum Distillation

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Solution Overview

Problem

The existing MEG regeneration processes, particularly the slip stream concept, require high temperatures in the distillation unit to vaporize large amounts of water, leading to thermal degradation of MEG and increased energy consumption, resulting in high processing costs and performance issues when reused as a hydrate inhibitor.

Innovation Solution

A device and method that maintain the distillation unit in a low vacuum state by using a steam ejector with external high-pressure steam, reducing the operating temperature and energy consumption, while removing low and high soluble salts to regenerate MEG in high concentration.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If high temperature is used in the distillation unit to vaporize large amounts of water, then water vaporization efficiency is improved, but MEG undergoes thermal degradation and energy consumption increases

Engineering Contradiction:
Improvewater vaporization efficiencyVSAvoidenergy consumption
Core Design Contradiction:
ProductivityVSLoss of energy

Solution Approach 1:

The patent utilizes phase transition of water from liquid to vapor in the distillation unit to separate water from MEG. By controlling the phase change process under vacuum conditions, the system achieves efficient water removal while maintaining lower operating temperatures that prevent MEG degradation and reduce energy consumption.

Inventive Principle:
Principle #36Phase transitions

Solution Approach 2:

The patent creates a vacuum environment (inert atmosphere) in the distillation unit to lower the boiling point of water. This allows water vaporization to occur at reduced temperatures, preventing thermal degradation of MEG while maintaining high vaporization efficiency and reducing energy requirements.

Inventive Principle:
Principle #39Inert atmosphere (Inert environment)

2Productivity

If high temperature is used in the distillation unit to vaporize large amounts of water, then water vaporization efficiency is improved, but MEG undergoes thermal degradation

Engineering Contradiction:
Improvewater vaporization efficiencyVSAvoidMEG performance
Core Design Contradiction:
ProductivityVSReliability

Solution Approach 1:

The system employs controlled phase transition of water under vacuum conditions to achieve efficient separation. The vacuum environment allows water to vaporize at lower temperatures, ensuring high vaporization efficiency while protecting MEG from thermal degradation and maintaining its performance reliability as a hydrate inhibitor.

Inventive Principle:
Principle #36Phase transitions

Solution Approach 2:

By maintaining a vacuum environment in the distillation unit, the patent creates conditions where water can be vaporized at reduced temperatures. This protects MEG from thermal exposure that would cause degradation, thereby preserving MEG's functional reliability while achieving effective water removal.

Inventive Principle:
Principle #39Inert atmosphere (Inert environment)

3Temperature

If vacuum degree is increased in the distillation unit, then operating temperature is reduced, but processing time increases

Engineering Contradiction:
Improveoperating temperatureVSAvoidprocessing time
Core Design Contradiction:
TemperatureVSLoss of time

Solution Approach 1:

The patent utilizes phase transition dynamics under controlled vacuum conditions to optimize the balance between temperature and processing time. By maintaining an appropriate vacuum level, the system achieves sufficiently low operating temperatures to prevent MEG degradation while keeping water vaporization rate high enough to maintain reasonable processing time.

Inventive Principle:
Principle #36Phase transitions

Solution Approach 2:

The system optimizes the vacuum degree parameter to achieve the desired balance. By carefully controlling the vacuum level rather than maximizing it, the patent maintains operating temperature low enough to protect MEG while ensuring water vaporization proceeds at an acceptable rate, thus avoiding excessive processing time.

Inventive Principle:
Principle #35Parameter changes

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

The solution effectively reduces the operating temperature of the distillation unit, decreases processing costs, and regenerates MEG in high concentration, minimizing thermal degradation and improving its performance as a hydrate inhibitor.

Implementation Method 1

the distillation unit includes a steam ejector into which vaporized water and external high-pressure steam flow

Methodology Applied
Scientific EffectSteam ejector effect: Injector

Implementation Method 2

a distillation unit connected to the pre-treatment unit and configured to receive the raw material from which the low soluble salts are removed and generate a treatment solution by vaporizing the water

Methodology Applied
Scientific EffectVaporization: Evaporation

Implementation Method 3

a flash drum connected to the distillation unit and configured to receive and vaporize at least a portion of the treatment solution

Methodology Applied
Scientific EffectFlash vaporization: Flash Evaporation

Data Source

PatentUS10822294B2Device for regenerating mono-ethylene glycol and method for regenerating mono-ethylene glycol
Publication Date: 2020.11.03 SEOUL NATIONAL UNIVERSITY R&DB FOUNDATION
  • US10822294B2 patent drawing
  • US10822294B2 patent drawing
  • US10822294B2 patent drawing

AI summary

Provided is a device for regenerating mono-ethylene glycol (MEG) including a pre-treatment unit to receive a raw material and remove the low soluble salts therefrom, a distillation unit connected to the pre-treatment unit and configured to receive the raw material from which the low soluble salts are removed and generate a treatment solution by vaporizing the water, a flash drum connected to the distillation unit and configured to receive and vaporize at least a portion of the treatment solution, a high soluble salt removal unit connected to the flash drum and configured to remove the high soluble salts from the treatment solution, an extractor connected to the flash drum and configured to extract vaporized MEG, and a recovery unit connected to both the distillation unit and the extractor and configured to recover MEG, wherein the distillation unit includes a steam ejector into which vaporized water and external high-pressure steam flow.