Iron Complex Catalyst for High-Yield Transesterification
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for transesterification of alkyl (meth)acrylates with alcohol compounds having tertiary hydroxyl groups do not achieve high yields, as existing processes either fail to esterify all hydroxyl groups or require extended reaction times, leading to secondary esterification and reduced productivity.
Innovation Solution
A method involving the use of an iron complex catalyst with a specific ligand, controlled water content below 100 ppm, and dehydration of the catalyst before use, allowing for the one-pot esterification of all hydroxyl groups in polyhydric alcohol compounds, such as isoprene glycol, to produce (meth)acrylate ester compounds with high yields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If extended reaction time is used to esterify all hydroxyl groups, then the yield of (meth)acrylate ester compound increases, but secondary esterification occurs on the tertiary hydroxyl group leading to reduced productivity
Solution Approach 1:
The patent changes the water content parameter to not more than 100 ppm and optimizes the catalyst system using iron complexes with specific ligands (beta-diketonates, salicylaldehydes, or carboxylic acid salts). These parameter changes enable complete esterification of all hydroxyl groups including tertiary hydroxyl groups within 1-24 hours without causing secondary esterification, thus resolving the contradiction between esterification completeness and productivity
Solution Approach 2:
The patent introduces iron complex catalysts with specific ligands as intermediaries to facilitate the transesterification reaction. The iron complex acts as a mediator that enables selective esterification of primary and secondary hydroxyl groups while preventing unwanted reactions at tertiary hydroxyl groups, allowing complete conversion within optimal time frames
2Manufacturing precision
If conventional catalysts are used for transesterification, then the reaction can proceed, but the yield is low and reaction time is extended
Solution Approach 1:
The patent employs iron complex catalysts with specific ligands (beta-diketonates, salicylaldehydes, or carboxylic acid salts) and controls water content to not more than 100 ppm. This catalyst system achieves high yields (90% or more) of (meth)acrylate ester compounds within 1-24 hours, significantly improving both yield and reaction time compared to conventional catalysts
Solution Approach 2:
The iron complex catalyst acts as an effective intermediary that facilitates rapid and high-yield esterification. The specific ligand structure of the iron complex enables efficient catalysis of the transesterification reaction, achieving complete conversion of polyhydric alcohols to (meth)acrylate esters with minimal reaction time
3Ease of manufacture
If water content is not controlled in the transesterification system, then the reaction proceeds more easily, but the yield decreases and side reactions increase
Solution Approach 1:
The patent optimizes the water content parameter to not more than 100 ppm in the transesterification system. This parameter optimization maintains ease of manufacture while achieving high yields (90% or more) of (meth)acrylate ester compounds. The controlled low water content prevents hydrolysis side reactions and ensures complete esterification
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 efficiently esterifies all hydroxyl groups in polyhydric alcohol compounds, such as isoprene glycol, resulting in high-yield (meth)acrylate ester compounds like isoprene glycol di(meth)acrylate, reducing reaction time and preventing polymerization, thus enhancing productivity and cost-effectiveness.
Implementation Method 1
transesterifying an alkyl (meth)acrylate with an alcohol compound having a tertiary hydroxyl group using a transesterification catalyst including a complex of iron with a ligand
Implementation Method 2
the water content in the transesterification reaction system is or has been controlled to not more than 100 ppm
Data Source
Figure 1~3
AI summary
An object of the invention is to provide a method for producing a (meth)acrylate ester compound by the transesterification of an alkyl (meth) acrylate with an alcohol compound having a tertiary hydroxyl group so as to esterify all the hydroxyl groups present in the alcohol compound with a high yield or, in a preferred embodiment, a method for esterifying a polyhydric alcohol compound having a tertiary hydroxyl group and also having a primary hydroxyl group and/or a secondary hydroxyl group by one-pot transesterification into a (meth)acrylate ester compound of the polyhydric alcohol. The method for producing a (meth) acrylate ester compound includes a step (I) of transesterifying an alkyl (meth)acrylate with an alcohol compound having a tertiary hydroxyl group using a transesterification catalyst including a complex of iron with a specific ligand, the water content in the transesterification reaction system being not more than 1000 ppm.