Humic Acid Extraction via Sonication and UV Oxidation
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Solution Overview
Problem
Conventional methods for extracting humic substances from coal via chemical oxidation are costly due to high expenses associated with oxidizing agents and processes, achieving a yield of only 75% humic acids, whereas the new method employs sonication milling and ultraviolet irradiation with hydrogen peroxide to enhance surface contact and radical oxidation, achieving a 95% yield.
Innovation Solution
The method involves milling coal using sonication to reduce particle size to 10-100 microns, followed by oxidation with hydrogen peroxide under ultraviolet light, specifically in the 200 nm wavelength range, to maximize hydroxyl radical production and enhance coal oxidation, thereby increasing humic acid extraction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional chemical oxidation methods are used to extract humic substances from coal, then the extraction process can be performed with standard equipment and procedures, but the cost is high and the yield is limited to 75%
Solution Approach 1:
The patent changes the particle size parameter of coal from conventional sizes to 10-100 microns through sonication milling, which dramatically increases the surface area and improves both the yield (to 95%) and cost-effectiveness of the oxidation process. This parameter change enables more efficient contact between the oxidizing agent and coal particles.
Solution Approach 2:
The patent applies preliminary sonication treatment to the coal before oxidation to reduce particle size and increase porosity. This preliminary action prepares the coal in a more reactive state, allowing the subsequent oxidation step to proceed with higher efficiency and lower costs, achieving 95% yield compared to 75% with conventional methods.
2Productivity
If coal particles are milled to larger sizes (less than 2 mm) before oxidation, then the process is simpler and faster, but the surface contact with oxidizing agent is insufficient, limiting extraction efficiency
Solution Approach 1:
The patent uses sonication (ultrasonic vibration) to mill the coal particles to 10-100 microns. The mechanical vibration from ultrasonic waves creates cavitation effects that efficiently break down coal particles and increase porosity, achieving the desired fine particle size and high extraction efficiency while maintaining a relatively simple process setup.
3Manufacturing precision
If conventional milling is used to reduce particle size, then the equipment is simple and operation is easy, but the particle size reduction is insufficient to maximize surface contact and oxidation efficiency
Solution Approach 1:
The patent replaces conventional mechanical milling systems with sonication (acoustic field) to achieve particle size reduction to 10-100 microns. This substitution provides more precise particle size control and creates more uniform particle distribution while maintaining ease of operation through simple sonication treatment protocols.
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 significantly increases the yield of humic acids to 95% compared to conventional methods, demonstrating improved extraction efficiency and cost-effectiveness by maximizing surface contact and radical oxidation.
Implementation Method 1
milling by means of sonication
Implementation Method 2
the coal particles are furthermore subjected to cavitation phenomena, where millions of microscopic bubbles experiencing rapid expansion and collapse processes are generated
Implementation Method 3
oxidations in oxygen-deficient atmospheres in furnaces
Implementation Method 4
the step of oxidising being carried out in the presence of an oxidising agent under irradiation with ultraviolet light
Data Source
Figure 1
AI summary
The present invention provides an improved method for the extraction by oxidation of humic substances from coal, the method including a step of milling by means of sonication before the step of oxidising, the step of oxidising being carried out in the presence of an oxidising agent under irradiation with ultraviolet light.