Transesterification Pressure Control for Low-Polymerization Acrylates
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Solution Overview
Problem
Conventional (meth)acrylic ester transesterification methods require excess (meth)acrylic esters to control reaction temperature, leading to inefficient use of reactor volume and excess material disposal, which is costly and time-consuming.
Innovation Solution
A method involving a reactor system with continuous side product removal and pressure adjustment to maintain reaction temperature below a threshold, using a catalyst to convert (meth)acrylate and alcohol into alkyl (meth)acrylate, with pressure adjustment to prevent polymerization and optimize reaction rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If excess (meth)acrylic esters are used to control reaction temperature, then polymerization is prevented, but reactor volume utilization is reduced and space-time yield decreases
Solution Approach 1:
The patent extracts and removes the side product (excess (meth)acrylic ester) continuously from the reaction system through a distillation column. This allows the reaction to proceed with near-stoichiometric amounts of reactants while preventing temperature runaway and polymerization, thereby improving space-time yield without sacrificing safety
Solution Approach 2:
The patent implements continuous removal of the side product during the reaction process rather than batch removal. This continuous action maintains optimal reaction conditions throughout the process, preventing polymerization while maximizing reactor utilization and productivity
2Temperature
If excess (meth)acrylic esters are used to control reaction temperature, then reaction temperature is limited, but larger quantities of (meth)acrylic esters must be recycled or disposed of
Solution Approach 1:
The patent extracts the side product (excess (meth)acrylic ester) continuously from the reaction system through distillation. This eliminates the need to dispose of large quantities of excess material while maintaining temperature control through side product removal rather than reactant excess
Solution Approach 2:
The patent discards only the necessary side product (water or alcohol) while recovering and recycling the (meth)acrylic ester through the distillation column. This minimizes material loss and disposal costs while maintaining reaction temperature control
3Productivity
If pressure is lowered to remove side product, then reaction rate increases, but polymerization risk increases
Solution Approach 1:
The patent implements continuous side product removal through distillation, which maintains low concentration of reactive species throughout the reaction. This allows operation at optimized pressure and temperature conditions that maximize reaction rate while continuously preventing polymerization through side product extraction
Solution Approach 2:
The distillation column provides continuous feedback control by removing side product as it forms. This automatic regulation maintains reaction conditions within safe limits while optimizing reaction rate, preventing polymerization without requiring excessive pressure reductions
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
Reduces polymerization tendency and increases the space-time yield by effectively utilizing reactor volume and maintaining optimal reaction conditions.
Implementation Method 1
heating and/or cooling system (12, 12a)...converted by the (trans)esterification reaction at a reaction temperature...over a predominant amount of time during the (trans)esterification reaction the given pressure is constantly adjusted to keep the reaction temperature below a predetermined upper limit
Implementation Method 2
column (2)...over a predominant amount of time during the (trans)esterification reaction at least a portion of the side product is continuously removed by distillate take off
Implementation Method 3
The vapors from the column are condensed and a partial or the full stream is discharged into a receiver vessel
Implementation Method 4
The reactor can be evacuated via a vacuum system. The vacuum can be regulated as required. The pressure in the reactor system can be chosen freely
Implementation Method 5
converted by the (trans)esterification reaction at a reaction temperature and a given pressure in the reaction chamber in the presence of a catalyst
Data Source
AI summary
A method for the discontinuous (trans)esterification of (meth)acrylic esters can prepare an alkyl (meth)acrylate product by a (trans)esterification reaction of a reaction mixture. The reaction mixture has a (meth)acrylate starting material and a first alcohol which are converted by the (trans)esterification reaction in the presence of a catalyst into the alkyl (meth)acrylate product and a side product. The (trans)esterification reaction is carried out in a reactor system. The reactor system has a heating and/or cooling system, a reaction chamber comprising the reaction mixture, a column with a column head, a vapor transfer line, a condenser, a reflux tank, a reflux line, a distillate transfer line, and a receiver vessel. Over a predominant amount of time during the (trans)esterification reaction at least a portion of the side product is continuously removed by distillate take off. The pressure is constantly adjusted to keep the reaction temperature below a predetermined upper limit.