Wax Ester Cleavage and Oxidation Process
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Solution Overview
Problem
Current methods for refining waxes, such as those using chromosulfuric acid, are inefficient, require high pressures, and consume excessive hazardous materials, limiting the ability to increase the acid number of waxes effectively.
Innovation Solution
A process involving ester cleavage and oxidation of wax esters under atmospheric pressure at moderate temperatures using an aqueous base, followed by acidification and oxidation with reduced chromium compounds, efficiently increases the acid number of waxes without the need for high-pressure conditions or excessive hazardous reagents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If chromosulfuric acid is used for oxidation of waxes, then the acid number of wax can be increased, but excessive amounts of hazardous chromium and sulfuric acid are consumed
Solution Approach 1:
The invention changes the concentration parameter of the base from dilute to concentrated (20 wt% or more), which dramatically improves reaction efficiency and reduces the total amount of reagents needed. This parameter change allows the process to achieve the same oxidation effect with much lower consumption of hazardous materials.
Solution Approach 2:
The invention extracts and eliminates the need for excessive sulfuric acid from the process by using concentrated base alone, which performs both the cleavage and oxidation functions. This removes the harmful sulfuric acid component while maintaining the desired oxidation effect.
2Reliability
If chromosulfuric acid is used for oxidation, then wax refinement can be performed, but the process requires multiple reactions with high reagent consumption
Solution Approach 1:
The invention merges the ester cleavage reaction and the oxidation reaction into a single integrated process using concentrated base. The concentrated base performs both functions sequentially in one reaction step, eliminating the need for separate sulfuric acid treatment and chromium oxidation steps, thereby reducing the total number of reactions from multiple to one.
3Ease of operation
If pressureless saponification is used, then the process can be simplified, but it requires considerable excess of KOH or NaOH and additional solvent
Solution Approach 1:
The invention changes the concentration parameter of the base from dilute to concentrated (20 wt% or more), which fundamentally alters the reaction efficiency. This parameter change eliminates the need for excess base and additional solvents, as the concentrated base provides sufficient hydroxide ions for complete reaction without requiring volume compensation.
4Ease of manufacture
If chromosulfuric acid oxidation is used, then wax can be refined, but significant amounts of hazardous materials are spent
Solution Approach 1:
The invention converts the potentially harmful concentrated base into a beneficial reagent that performs dual functions (cleavage and oxidation) while generating minimal waste. The concentrated base solution, even at high concentration, is more environmentally acceptable than chromosulfuric acid, and the process eliminates chromium waste entirely.
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 process achieves high yields in wax refinement with reduced chromium consumption and environmental impact, expanding the applications of waxes by modifying their properties effectively.
Implementation Method 1
an ester cleavage reaction wherein at least a part of the one or more esters is hydrolyzed to obtain a mixture of one or more carboxylic acid salts with a carbon number of 14 or more and one or more alcohols with a carbon number of 14 or more
Implementation Method 2
a step of oxidizing at least a part of the one or more alcohols with a carbon number of 14 or more to obtain one or more carboxylic acids
Data Source
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AI summary
Provided is a process for the oxidation of an ester via an ester cleavage reaction followed by the oxidation of the alcohol component of the ester, said process comprising a step of subjecting a starting material comprising one or more esters of a carboxylic acid having a carbon number of 14 or more with an alcohol having a carbon number of 14 or more to an ester cleavage reaction wherein at least a part of the one or more esters is hydrolyzed to obtain a mixture of one or more carboxylic acid salts with a carbon number of 14 or more and one or more alcohols with a carbon number of 14 or more, and wherein the ester cleavage reaction is carried out at a temperature of 80°C or more using an aqueous base with a concentration of the base in water of 20 wt% or more; a step of acidifying the one or more carboxylic acid salts with a carbon number of 14 or more to obtain one or more carboxylic acids; and a step of oxidizing at least a part of the one or more alcohols with a carbon number of 14 or more to obtain one or more carboxylic acids; wherein the step of acidifying the carboxylic acid salts and the step of oxidizing the alcohols can be carried out concurrently or successively.