Heonone Methacrylate Transesterification with Acid Catalyst
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Solution Overview
Problem
The production of heonone (meth)acrylate by transesterification of alkyl (meth)acrylate with heonone is hindered by the significant formation of Michael adducts as by-products, making separation economically unfeasible, especially for long-chain alkanols, and requiring costly vacuum distillation.
Innovation Solution
A process involving the use of a titanium (IV) or zirconium (IV) containing catalyst, an inorganic or organic acid, and an azeotrope-forming entrainer for continuous distillation, followed by water addition and catalyst separation, significantly reduces Michael adduct formation, allowing for efficient separation of heonone (meth)acrylate with minimal by-products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If transesterification is carried out with long-chain alkanols to produce heonone (meth)acrylate, then the desired product is obtained, but Michael adducts are formed as by-products in significant amounts making separation economically unfeasible
Solution Approach 1:
An azeotrope-forming entrainer is introduced as an intermediary substance to facilitate the selective removal of Michael adducts from the reaction mixture. The entrainer forms an azeotrope specifically with the Michael adducts, enabling their preferential distillation and separation from the desired heonone (meth)acrylate product, thus resolving the contradiction between product formation and by-product contamination
Solution Approach 2:
The process utilizes changes in boiling point parameters and azeotropic composition to separate Michael adducts from the target product. By operating at specific temperature and pressure conditions where the entrainer-Michael adduct azeotrope distills preferentially, the system achieves selective removal of harmful by-products while maintaining product integrity
2Manufacturing precision
If vacuum distillation is used to separate heonone (meth)acrylate from Michael adducts, then separation is possible, but the process becomes economically unfeasible due to high costs
Solution Approach 1:
The azeotrope-forming entrainer acts as a mediator that enables separation at atmospheric or mild vacuum conditions, replacing the need for high-cost high-vacuum distillation. The entrainer modifies the volatility relationships in the mixture, allowing efficient separation at economically viable operating conditions
Solution Approach 2:
By changing the operational parameters from high-vacuum conditions to atmospheric or mild vacuum distillation enabled by the entrainer, the process achieves the same separation effect at significantly lower energy costs and equipment investment, resolving the economic infeasibility
3Productivity
If conventional transesterification is used without additional acid, then the reaction proceeds with standard catalyst, but Michael adducts are formed to a significant extent
Solution Approach 1:
An additional inorganic or organic acid is introduced as a secondary catalyst to work synergistically with the titanium or zirconium catalyst. This additional acid component modifies the reaction pathway to suppress Michael addition side reactions while maintaining efficient transesterification, thereby reducing by-product formation without sacrificing productivity
Solution Approach 2:
The catalytic system is enhanced by combining titanium or zirconium catalyst with an additional inorganic or organic acid, creating a composite catalytic system that simultaneously promotes the main transesterification reaction while suppressing unwanted Michael addition reactions, thus resolving the contradiction between productivity and by-product formation
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 predominantly forms heonone (meth)acrylate with less than 2% by-product content, including Michael adducts, and up to 6% secondary components, enhancing the economic viability of the separation process.
Implementation Method 1
Reacting alkyl (meth)acrylate with heonone in the presence of a titanium (IV) or zirconium (IV) containing catalyst
Implementation Method 2
steps (i) and (ii) are carried out in the presence of an additional inorganic or organic acid
Implementation Method 3
in the presence of an entrainer which forms an azeotrope with the alcohol bound in the alkyl (meth)acrylate
Implementation Method 4
continuously distilling off the azeotrope of entraining agent and alcohol
Implementation Method 5
addition of water to the in steps (i) and (ii) the resulting product mixture containing heonone (meth)acrylate and separating off hydrolyzates of the titanium(IV) or zirconium(IV)-containing catalyst
Data Source
AI summary
The invention relates to a method for producing Heonon(meth)acrylate via the transesterification of alkyl(meth)acrylate with Heonon, comprising the following steps: (i) permitting alkyl(meth)acrylate to react with Heonon in the presence of a catalyst containing titanium (IV) or zirconium (IV) and a stabiliser in the presence of an entrainer, forming an azeotrope with the alcohol bonded in the alkyl(meth)alcylate; (ii) continuous distilling off of the azeotrope from the entrainer and alcohol, wherein steps (i) and (ii) are carried out simultaneously, until heonon is substantially completely converted; (iii) adding water to the product mixture obtained in steps (i) and (ii) and containing heonon(meth)acrylate, and separating the hydrolysate from the catalyst containing titanium (IV) or zirconium (IV) by means of filtration; (iv) distilling off of non-converted alkyl(meth)acrylate and entrainer from the product mixture; (v) distilling off of water from the product mixture, wherein step (iv) can also be carried out before step (iii), and the steps (iv) and (v) can also be carried out in a distillation step, characterised in that the steps (i) and (ii) are carried out in the presence of an inorganic or organic acid.