Ethanol Dehydration Thermal Coupling for Energy Reduction

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Solution Overview

Problem

Current methods for ethylene production by ethanol dehydration are inefficient in energy utilization, leading to high energy consumption and increased operating costs, as they do not comprehensively utilize heat throughout the process.

Innovation Solution

A thermal coupling method that integrates heat exchange across various systems, including ethanol dehydration, quenching compression, alkaline washing, molecular sieve drying, and ethylene purification, to recycle and reuse heat sources and cold sources, optimizing heat exchanger networks to reduce energy consumption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of energy

If conventional ethanol dehydration process is used, then ethylene production is achieved, but energy consumption is high and heat utilization is inefficient

Engineering Contradiction:

Improveenergy consumptionVSAvoidethylene production efficiency

Core Design Contradiction:

Loss of energyVSProductivity

Solution Approach 1:

The patent merges multiple heat exchange systems into an integrated thermal coupling network, combining the ethanol dehydration system, quenching compression system, alkaline washing system, molecular sieve drying system, and ethylene purification system into a unified heat recovery network that maximizes energy utilization across all process streams

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent implements a feedback mechanism where hot process streams continuously feed heat back to cold process streams through strategically positioned heat exchangers, creating a self-sustaining thermal cycle that reduces external energy input requirements while maintaining high ethylene production efficiency

Inventive Principle:

Principle #23Feedback

2Loss of energy

If heat exchange systems are integrated across multiple processes, then energy consumption is reduced, but device complexity increases

Engineering Contradiction:

Improveenergy consumptionVSAvoidheat exchanger network complexity

Core Design Contradiction:

Loss of energyVSDevice complexity

Solution Approach 1:

The patent designs heat exchangers to perform multiple functions simultaneously - for example, the first heat exchanger not only preheats ethanol but also recovers heat from multiple process streams, and the second heat exchanger serves dual purposes in the quenching compression system, thereby reducing the total number of separate equipment items needed

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 reduces energy consumption by approximately 48% while maintaining high-purity ethylene production, decreasing equipment investments and production costs.

Implementation Method 1

ethanol dehydration reaction products in the ethanol dehydration reaction system serve as a heat source for preheating, vaporization and superheating of a raw material of ethanol

Methodology Applied