5-Ethylidene-2-Norbornene Process Recycling Solvent
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing preparation process of 5-ethylidene-2-norbomene faces inefficiencies in separation and purification, leading to raw material loss and increased economic costs.
Innovation Solution
A multi-step process involving the thermal decomposition of dicyclopentadiene, purification of cyclopentadiene, Diels-Alder reaction with 1,3-butadiene, recovery of solvents and unreacted materials, and subsequent isomerization of 5-vinyl-2-norbornene to produce 5-ethylidene-2-norbornene, with optimized recycling and separation techniques to enhance process efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If conventional separation and purification methods are used in the 5-ethylidene-2-norbornene preparation process, then the process can be completed, but separation and purification efficiency is low leading to raw material loss
Solution Approach 1:
The patent implements a recycling system where unreacted 1,3-butadiene and solvent are recovered from the reaction mixture through distillation and returned to the Diels-Alder reactor. This prevents raw material loss by recovering and reusing valuable components that would otherwise be discarded, directly addressing the contradiction between reducing substance loss and maintaining productivity.
Solution Approach 2:
The process incorporates a feedback mechanism where the separation and purification units continuously monitor and return unreacted materials to the reaction stage. This closed-loop system ensures that raw materials are not lost but fed back into the process, improving both substance retention and overall process efficiency.
2Ease of manufacture
If conventional preparation process is used, then 5-ethylidene-2-norbornene can be produced, but economic feasibility is reduced due to increased costs and utility usage
Solution Approach 1:
The patent combines multiple functions into integrated units: the separation tower simultaneously performs distillation and purification, while the recycling system merges solvent recovery with unreacted material return. This consolidation reduces the number of separate operations and utility requirements, improving economic feasibility while reducing energy loss.
Solution Approach 2:
By recovering and recycling solvent and unreacted 1,3-butadiene instead of discarding them, the process reduces material waste and the need for continuous fresh material input. This decreases both operational costs and utility consumption, directly improving economic feasibility while reducing energy loss.
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
The proposed process achieves improved separation and purification efficiencies, reduces raw material loss, and enhances the economic feasibility of the 5-ethylidene-2-norbornene production by minimizing utility usage and process troubles.
Implementation Method 1
step a-1 of introducing dicyclopentadiene (DCPD) into a DCPD decomposition reactor (110) to thermally decompose the DCPD
Implementation Method 2
step b-1 of introducing 1,3-butadiene (BD), a solvent, and cyclopentadiene separated from the top of the CPD purification tower (120) into a Diels-Alder reactor (210) to react the same
Implementation Method 3
step d of introducing the 5-vinyl-2-norbornene into an isomerization reactor (410) to react the same
Implementation Method 4
step a-2 of introducing a product of step a-1 into a cyclopentadiene (CPD) purification tower (120)
Data Source
AI summary
A preparation process of 5-ethylidene-2-norbornene, including: introducing dicyclopentadiene into a dicyclopentadiene decomposition reactor to thermally decompose the dicyclopentadiene; introducing a product of the above step into a cyclopentadiene purification tower; introducing 1,3-butadiene, a solvent, and cyclopentadiene separated from the top of the cyclopentadiene purification tower into a Diels-Alder reactor to react the same; introducing a product of the immediate above step into a 1,3-butadiene removal tower to recover 1,3-butadiene from the top; introducing a mixture at the bottom of the 1,3-butadiene removal tower into a desolvation tower, and recycling a solvent and unreacted raw materials recovered from the top of the desolvation tower to the dicyclopentadiene decomposition reactor; introducing a mixture at the bottom of the desolvation tower into a 5-vinyl-2-norbornene separation tower to separate 5-vinyl-2-norbornene; and introducing the 5-vinyl-2-norbornene into an isomerization reactor to react the same.