Staged Condensation for Eugenol Recovery from Biomass Torrefaction
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Solution Overview
Problem
Current biomass drying and torrefaction processes are energy-intensive and lack efficient methods for selectively producing eugenol and formalin, with existing solutions failing to effectively recover these valuable compounds from lignocellulosic biomass.
Innovation Solution
A staged condensation process is implemented with judiciously selected operating temperatures to selectively produce eugenol, simplifying distillation or extraction trains and improving energy performance, while an additional condensation stage is used to recover formaldehyde, resulting in an aqueous solution of polymerized formaldehyde.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If traditional hydrodistillation of cloves is used to produce eugenol, then eugenol can be obtained from natural products, but the process is limited by raw material availability and requires extensive extraction and distillation operations
Solution Approach 1:
The invention changes the production approach from extraction-based to synthesis-based by torrefying biomass at controlled temperatures (200-300°C) to directly generate eugenol in the vapor phase, eliminating the need for complex extraction and distillation operations while maintaining high eugenol production
Solution Approach 2:
The invention utilizes phase transition by torrefying biomass to produce eugenol in vapor form, then condensing the vapor to obtain liquid eugenol, thereby simplifying the production process and eliminating extensive extraction and distillation operations
2Productivity
If biomass is dried to around 15% moisture content before gasification, then conversion efficiency is improved, but energy consumption increases due to evaporation of moisture
Solution Approach 1:
The invention optimizes the moisture content parameter to around 15% before torrefaction, balancing conversion efficiency with energy consumption by avoiding excessive drying while maintaining effective torrefaction performance
Solution Approach 2:
The invention converts the harmful effect of moisture (which requires energy-intensive evaporation) into a beneficial process by using controlled torrefaction at 200-300°C that efficiently removes moisture while simultaneously producing valuable eugenol, thereby converting energy loss into product gain
3Quantity of substance
If torrefaction is carried out at temperatures between 200 and 300°C in an oxygen-deficient atmosphere, then eugenol is produced in the vapor phase, but selective recovery of eugenol from the complex vapor mixture is challenging
Solution Approach 1:
The invention utilizes phase transition by condensing the eugenol vapor produced during torrefaction to obtain liquid eugenol, enabling selective recovery from the complex vapor mixture through temperature-controlled condensation
Solution Approach 2:
The invention optimizes condensation temperature parameters to selectively recover eugenol from the vapor mixture, using controlled temperature reduction to precipitate eugenol while separating it from other volatile components
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 approach enhances the profitability of biomass drying and roasting installations by selectively isolating value-added products, reducing energy consumption, and lowering investment costs compared to traditional methods, with eugenol production ranging from 5 to 25 kg per 10 tonnes of biomass and economic viability demonstrated through parametric studies.
Implementation Method 1
staged condensation process is implemented with judiciously selected operating temperatures to selectively produce eugenol
Implementation Method 2
an additional condensation stage is used to recover formaldehyde, resulting in an aqueous solution of polymerized formaldehyde
Implementation Method 3
roasting biomass, preferably lignocellulosic biomass, is a pretreatment step before injecting it in pulverized form into a continuous flow reactor
Data Source
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AI summary
The invention relates to a process for producing eugenol comprising the following steps: a) drying wet biomass; b) roasting the dried biomass according to step a); c) staged condensation of the vapors from the roasting according to step b, the condensation being carried out in at least two stages in series at temperatures between 170 and 230°C in the first stage and between 110 and 130°C in the second stage, downstream of the first stage, with the liquid sugars being recovered at the outlet of the first stage, while the liquid mixture consisting of eugenol and other condensates is recovered at the outlet of the second; d) purification of the recovered mixture according to step c, in order to recover the eugenol. The invention also relates to an installation for implementing the process.