Packed-Bed Reactor Enzymatic Polyester Synthesis
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Solution Overview
Problem
The production of low-melt polyester-based toners is environmentally unfavorable due to high energy consumption, long synthesis times, and residual organotin catalysts, while enzymatic ring-opening polymerization is difficult to scale up due to challenges in recovering and recycling supported enzyme catalysts.
Innovation Solution
A method using a packed-bed reactor with immobilized enzymes to convert cyclic esters to polyester, where a monomer solution is circulated through the reactor to generate a solution enriched with polyester, allowing for easier scale-up and reduced energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If batch reaction with supported enzyme catalysts is used to produce polyester, then crystalline polyester can be generated at atmospheric pressure and low temperatures, but the process is difficult to scale up due to high product fluid viscosity preventing catalyst recovery
Solution Approach 1:
The patent transitions from batch reaction to continuous flow reaction through packed bed reactor. The monomer solution continuously flows through the reactor containing immobilized enzyme catalysts, maintaining steady-state conditions that enable scale-up while preserving the low-temperature enzymatic catalysis benefits
Solution Approach 2:
The patent uses immobilized enzyme catalysts supported on porous carriers within the packed bed reactor. The porous structure provides high surface area for catalysis while allowing continuous fluid flow through the bed, enabling both low-temperature reaction and scalable production
2Ease of operation
If large quantity of solvent is used to lower product fluid viscosity for catalyst recovery, then catalyst can be recovered by gravity settling, but the process becomes environmentally taxing and economically challenging
Solution Approach 1:
The patent extracts the catalyst from the reaction mixture by immobilizing it on solid supports within the packed bed reactor. The catalyst remains trapped in the reactor while the product solution flows through, eliminating the need for solvent-based separation and enabling direct continuous product collection
Solution Approach 2:
The patent introduces an intermediary solid support matrix that facilitates catalyst-product separation. The immobilized enzymes on solid carriers act as an intermediary medium that allows continuous flow of monomer solution and product while retaining the catalyst, avoiding direct contact between catalyst and large quantities of solvent
3Reliability
If conventional polycondensation method is used to produce polyester, then high temperatures and low pressures are required, but the synthesis and emulsification process takes several days and consumes high energy
Solution Approach 1:
The patent replaces the conventional thermal-driven polycondensation process with an enzymatic catalysis system. The immobilized enzyme catalysts facilitate polyester synthesis at much lower temperatures through biochemical catalysis, substituting thermal energy with catalytic action and dramatically reducing energy consumption
Solution Approach 2:
The patent changes the reaction parameters from high-temperature low-pressure conditions to ambient or mildly elevated temperature and atmospheric pressure. The enzymatic catalysis enables the reaction to proceed efficiently at these milder conditions, reducing energy requirements while maintaining productive polyester synthesis
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 achieves high productivity and efficient catalyst reuse, reducing energy requirements and environmental impact by enabling continuous operation and in-situ filtration, with improved control over molecular weight and polydispersity.
Implementation Method 1
The benefits of using enzymatic ring-opening polymerization of lactones at atmospheric pressure and relatively low temperatures to generate crystalline polyesters suitable for use in chemical toners is known in the art
Implementation Method 2
one or more immobilized enzymes convert the one or more cyclic esters to polyester in the packed-bed reactor during circulation
Data Source
AI summary
In accordance with various embodiments, there is a method of making a polyester. The method can include providing a monomer solution, the monomer solution including one or more cyclic esters in a concentration ranging from about 1 to about 100% and one or more solvents in a concentration ranging from about 99% to about 0%. The method of making a polyester can also include providing a packed-bed reactor including one or more immobilized enzymes, wherein the packed-bed reactor has an inlet and an outlet. The method can further include circulating the monomer solution through the packed-bed reactor to generate a solution enriched with polyester, such that the one or more immobilized enzymes convert the one or more cyclic esters to polyester in the packed-bed reactor during circulation and collecting the solution enriched with polyester exiting through the outlet.