Linear Carbonate Catalysis Using Sulfoxide-Dissolved Alkoxides
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing catalysts for preparing ethyl methyl carbonate and diethyl carbonate, such as sodium methoxide and sodium hydroxide, have low solubility in organic solvents, leading to column plugging and catalyst loss during reactive distillation and purification processes, which increases maintenance costs and reduces economic efficiency.
Innovation Solution
Using a sulfoxide-based solvent to dissolve the catalysts like lithium methoxide, lithium ethoxide, sodium methoxide, and sodium hydroxide, preventing catalyst precipitation and enabling reuse.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If sodium methoxide or sodium hydroxide is used as catalyst, then reaction activity is improved, but catalyst solubility in organic solvents deteriorates, causing column plugging
Solution Approach 1:
The patent introduces an intermediary substance (organic solvent) that mediates between the catalyst (sodium methoxide or sodium hydroxide) and the reaction system. This solvent dissolves the catalyst, allowing it to maintain high reaction activity while preventing precipitation and column plugging, thus resolving the contradiction between catalyst activity and solubility
Solution Approach 2:
The patent changes the physical state parameter of the catalyst from solid to dissolved state by introducing an organic solvent. This parameter change allows the catalyst to remain in solution during the reaction, eliminating the plugging issue while preserving catalytic activity
2Productivity
If catalyst is used in reactive distillation, then production rate is improved, but catalyst precipitation occurs during purification, causing plugging and loss
Solution Approach 1:
The organic solvent acts as an intermediary that keeps the catalyst in dissolved state throughout the entire process including purification. This prevents catalyst precipitation during the purification stage, eliminating plugging issues and catalyst loss while maintaining high production rates
Solution Approach 2:
The patent applies beforehand cushioning by pre-dissolving the catalyst in organic solvent before the reactive distillation process. This preventive measure ensures the catalyst remains in solution throughout the process, avoiding precipitation and plugging issues that would otherwise occur during purification
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
Minimizes process problems by preventing catalyst precipitation, reducing maintenance costs, and enhancing catalyst reuse efficiency.
Implementation Method 1
the catalyst is input in a state of being dissolved in a sulfoxide-based solvent having excellent catalyst solubility
Implementation Method 2
performing a transesterification reaction of dimethyl carbonate (DMC) and ethanol (EtOH) in the presence of a catalyst
Implementation Method 3
when the alcohol is distilled in the reactive distillation column
Data Source
AI summary
The present invention relates to a method of preparing a heterogeneous linear carbonate, the method including performing a transesterification reaction of dimethyl carbonate (DMC) and ethanol (EtOH) in the presence of a catalyst, wherein the catalyst is one or more selected from the group consisting of lithium methoxide (LME), lithium ethoxide (LEE), sodium methoxide (SME), sodium hydroxide (NaOH), and a mixture thereof, and the catalyst is input in a state of being dissolved in a sulfoxide-based solvent.