Activated Carbon Purification of Essential Oils
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Solution Overview
Problem
Existing methods for purifying essential oils, such as citrus oil, fail to effectively remove residual agricultural chemicals without causing a poor balance of flavor or decrease in flavor strength, leading to a decrease in oil quality and safety concerns.
Innovation Solution
Treating essential oils with activated carbon, specifically using zinc chloride-activated active carbon, at low temperatures to efficiently remove contaminants like agricultural chemicals without affecting the oil's flavor profile.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional purification methods (distillation, porous adsorbents, filtration) are used to remove contaminants from essential oil, then contaminant removal is achieved, but flavor balance and flavor strength deteriorate
Solution Approach 1:
The patent changes the chemical parameters of the adsorbent by using zinc chloride-activated carbon with specific surface area (500-1500 m²/g) and pore size (20-100 Å), and controls process parameters including treatment temperature (0-25°C) and contact time (0.5-4 hours) to achieve selective adsorption that removes contaminants while preserving flavor compounds
Solution Approach 2:
The patent applies local quality by creating adsorbent particles with specific local properties - zinc chloride activation creates specific surface sites with different adsorption affinities, allowing the adsorbent to selectively bind contaminants in certain regions while leaving flavor compounds unaffected
2Object-affected harmful factors
If conventional purification methods are used to remove contaminants from essential oil, then contaminant removal is achieved, but oil quality decreases
Solution Approach 1:
The patent optimizes physical parameters including controlling treatment temperature at 0-25°C to prevent thermal degradation, limiting contact time to 0.5-4 hours to avoid over-adsorption, and selecting specific surface area (500-1500 m²/g) and pore size (20-100 Å) of the adsorbent to match the size and properties of contaminant molecules versus flavor compounds
3Productivity
If zinc chloride-activated active carbon is used at low temperatures to treat essential oil, then contaminant removal efficiency is high, but the process requires specific temperature control
Solution Approach 1:
The patent employs ambient temperature treatment (0-25°C) which eliminates the need for complex heating or cooling systems. The process utilizes the natural adsorption capacity of zinc chloride-activated carbon at room temperature, requiring only simple temperature monitoring rather than active temperature control equipment
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 results in a purified essential oil with high safety and quality, maintaining the original flavor strength and balance, and effectively removing contaminants like ortho-phenyl phenol from citrus oils with a high removal rate.
Implementation Method 1
an essential oil comprising a contaminant is treated with an active carbon, thereby removing the contaminant
Data Source
AI summary
It is provided a process for producing a purified essential oil excellent in safety and quality with high productivity from an essential oil comprising a harmful contaminant such as an agricultural chemical by simply and smoothly removing the contaminant with high removal rate without causing poor balance of flavor which the essential oil originally has, decrease of flavor strength and the like. It relates to a process for producing a purified essential oil by treating an essential oil comprising a contaminant with an active carbon to remove the contaminant and the removal rate of the contaminant is further improved by using an active carbon activated with a chemical, particularly an active carbon activated with zinc chloride, in the treatment, or by conducting the treatment at a low temperature of room temperature or lower, particularly at −25° C. to 5° C.