High-Pressure Absorption Column for Soda Ash Production

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Solution Overview

Problem

The Solvay process for producing soda ash is energy-intensive, dependent on high salinity brines, and not sustainable, with challenges in handling and processing saturated brines, and generates significant waste products.

Innovation Solution

A method involving a high-pressure absorption column where a pressurized saline solution is used to absorb carbon dioxide, allowing for the formation and filtration of sodium hydrogen carbonate, which is then converted to soda ash using a calciner, operating at pressures between 54 to 80 bar, enabling efficient production with low salinity brines and recycling of ammonia and carbon dioxide.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the Solvay process uses high salinity brines (saturated or nearly saturated with sodium chloride), then the soda ash production efficiency is improved, but the energy consumption increases and handling difficulties arise

Engineering Contradiction:

Improvesoda ash production efficiencyVSAvoidenergy consumption

Core Design Contradiction:

ProductivityVSUse of energy by moving object

Solution Approach 1:

The patent changes the salinity parameter from high (saturated) to low (0.1-6M NaCl concentration), and changes the pressure parameter from atmospheric to high pressure (54-80 bar). This combination allows efficient CO2 absorption and sodium bicarbonate formation without requiring energy-intensive brine concentration and handling systems

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent applies preliminary pressurization of both the saline solution and CO2 gas before they enter the absorption column. This preliminary action ensures that CO2 remains dissolved in the low-salinity brine without requiring subsequent energy-intensive concentration steps

Inventive Principle:

Principle #10Preliminary action

2Productivity

If the Solvay process uses saturated brine solutions, then the carbon dioxide absorption efficiency is improved, but the equipment complexity and operational difficulty increase

Engineering Contradiction:

Improvecarbon dioxide absorption efficiencyVSAvoidequipment complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent uses high pressure (54-80 bar) to enhance CO2 solubility and absorption efficiency in low-salinity brine, eliminating the need for complex saturated brine preparation and handling equipment. The high pressure itself becomes the driving force for efficient absorption

Inventive Principle:

Principle #35Parameter changes

3Productivity

If the Solvay process uses high salinity brines, then the sodium bicarbonate formation rate is improved, but the waste generation increases

Engineering Contradiction:

Improvesodium bicarbonate formation rateVSAvoidwaste generation

Core Design Contradiction:

ProductivityVSLoss of substance

Solution Approach 1:

The patent converts the previously harmful effect of using low-salinity brine (insufficient CO2 absorption) into a benefit by applying high pressure. This allows efficient sodium bicarbonate formation from low-salinity brine, which then eliminates waste brine disposal issues while maintaining high production rates

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

By changing from high salinity to low salinity brine and compensating with high pressure, the process eliminates waste brine generation entirely, as the low-salinity brine can be easily recycled without the handling and disposal problems associated with saturated brines

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

This method enhances the absorption of carbon dioxide, reduces sodium ion concentration, and increases energy efficiency, allowing for soda ash production with lower sodium chloride concentrations and minimizing waste, thus addressing the limitations of the Solvay process.

Implementation Method 1

dissolving the carbon-dioxide into the saline solution within the high-pressure absorption column

Methodology Applied

Scientific EffectAbsorption: Absorption (physical)

Implementation Method 2

The pressure of the high-pressure absorption column is between 54 to 80 bar

Methodology Applied

Scientific EffectPressure Increase: Pressurisation

Implementation Method 3

filtering sodium hydrogen carbonate from the high-pressure absorption column outlet stream

Methodology Applied

Scientific EffectFiltration: Filter (physical)

Implementation Method 4

feeding the sodium hydrogen carbonate to a calciner to convert the sodium hydrogen carbonate to soda ash

Methodology Applied

Scientific EffectDecomposition: Decomposition (biological)

Data Source

PatentUS12180083B1Method for producing soda ash

Publication Date: 2024.12.31 UNITED ARAB EMIRATES UNIVERSITY

AI summary

The present disclosure discloses a method for producing soda ash (sodium carbonate). The method comprises feeding a pressurized saline solution into a high-pressure absorption column; feeding pressurized carbon dioxide into the high-pressure absorption column; dissolving the carbon-dioxide into the saline solution within the high-pressure absorption column; discharging a high-pressure absorption column outlet stream to a filter; filtering sodium hydrogen carbonate from the high-pressure absorption column outlet stream; and feeding the sodium hydrogen carbonate to a calciner to convert the sodium hydrogen carbonate to soda ash. The pressure of the high-pressure absorption column is between 54 to 80 bar.