Buffered Aqueous Solution Desorption for Sulfate Reduction
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Solution Overview
Problem
Conventional processes for desorbing sulfur dioxide from aqueous solutions result in high sulfate formation, reducing the absorption capacity and necessitating costly purification steps, with high energy consumption due to elevated temperatures.
Innovation Solution
The process involves desorbing sulfur dioxide from a buffered aqueous solution containing carboxylic acids at a temperature of 110 °C or below and a pressure of 1500 mbar or less, significantly reducing sulfate formation by controlling temperature and pressure in the desorption process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the solution is heated to high temperature for desorption, then sulfur dioxide is effectively removed from the absorption solution, but sulfate formation increases significantly reducing absorption capacity
Solution Approach 1:
The patent applies parameter changes by operating the desorption process at lower temperatures (below 110°C) and reduced pressures (below 1500 mbar) compared to conventional high-temperature desorption. This parameter modification reduces the oxidation rate of sulfite to sulfate while maintaining effective sulfur dioxide recovery, thereby resolving the contradiction between desorption efficiency and sulfate formation.
2Loss of substance
If conventional high temperature desorption is used, then sulfur dioxide recovery is achieved, but energy consumption increases and sulfate formation reduces solution reusability
Solution Approach 1:
The patent utilizes parameter changes by implementing desorption at lower temperatures and pressures, which reduces the energy input required for the process. The lower operating temperature directly reduces heating energy consumption while the pressure reduction facilitates sulfur dioxide release at lower thermal input, thereby achieving effective recovery with reduced energy expenditure.
3Productivity
If high temperature desorption is applied, then sulfur dioxide is desorbed from the solution, but purification steps are required to remove formed sulfates increasing process complexity
Solution Approach 1:
The patent applies parameter changes by conducting desorption at lower temperatures and pressures, which minimizes sulfate formation during the process. By operating below 110°C and 1500 mbar, the oxidation of sulfite to sulfate is suppressed, thereby maintaining solution quality and eliminating or reducing the need for additional purification steps, thus resolving the contradiction between desorption productivity and process complexity.
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 minimizes sulfate formation by up to 99%, allowing the solution to be reused for extended periods without purification, reducing energy consumption, and minimizing the formation of undesired by-products, thereby enhancing the efficiency and sustainability of sulfur dioxide recovery.
Implementation Method 1
the recovery of sulfur dioxide thereby using an absorption solution in which the sulfur dioxide is first absorbed
Implementation Method 2
the desorption of sulfur dioxide from the buffered solution
Implementation Method 3
the solution is heated so that the energy consumption is quite high
Implementation Method 4
the formation of sulfates in the aqueous solution is reduced up to 70%, especially up to 75 %, preferably up to 95 %, especially up to 99 %
Data Source
Figure 1
AI summary
The present application refers to a process for the reduction of sulfate formation in a buffered aqueous solution during the desorption of sulfur dioxide from said buffered aqueous solution, wherein the formation of sulfates in the aqueous solution is reduced up to 70%, especially up to 75 %, preferably up to 95 %, especially up to 99 %, wherein the aqueous solution comprises at least one carboxylic acid, and wherein the desorption of sulfur dioxide from the buffered solution is performed at a pressure of 1500 mbar or below.