Biomass Pyrolysis Fermentation Integration for BTX Yield
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Solution Overview
Problem
Current processes for producing chemical intermediates like BTX and alcohols from biomass are inefficient, with prior art methods struggling to achieve optimal yields and flexibility in production.
Innovation Solution
A process combining catalytic pyrolysis of biomass in a fluidized-bed reactor with a subsequent fermentation step, utilizing a zeolite catalyst and recycling unreacted gaseous effluent to enhance BTX production by increasing the partial pressure of hydrocarbons, thereby improving the yield of BTX and oxygenated compounds such as alcohols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If catalytic pyrolysis of biomass is performed using conventional methods, then BTX production is achieved, but the yield is limited and flexibility in production is reduced
Solution Approach 1:
The process divides the conversion of biomass into separate functional steps: catalytic pyrolysis for BTX production and fermentation for alcohol production from gaseous effluent. This segmentation allows each step to be optimized independently, improving overall productivity while maintaining flexibility through selective operation of different pathways
Solution Approach 2:
The system uses the same gaseous effluent from pyrolysis for multiple purposes: directly for BTX production and for fermentation to produce alcohols. This multi-functionality increases production flexibility and allows the system to adapt to different market demands for chemical intermediates and biofuels
2Productivity
If unreacted gaseous effluent is not recycled, then the process is simpler, but BTX production is suboptimal
Solution Approach 1:
Instead of discarding unreacted gaseous effluent, the system recycles it back to the pyrolysis reactor. This recovery approach improves BTX production by maximizing the utilization of biomass carbon while the added complexity of the recycle loop is justified by the significant productivity improvement
3Productivity
If fermentation step is added to convert gaseous effluent, then oxygenated compounds are produced, but process complexity increases
Solution Approach 1:
The fermentation step is merged with the catalytic pyrolysis process, where the gaseous effluent from pyrolysis serves as the substrate for alcohol production. This integration allows simultaneous production of BTX and alcohols from the same biomass feedstock, maximizing productivity while sharing common infrastructure
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 integrated process achieves a higher yield of BTX and oxygenated compounds, optimizing the upgrading of biomass-derived carbon into valuable chemical intermediates and biofuels, with improved flexibility and efficiency compared to prior methods.
Implementation Method 1
catalytic pyrolysis of said biomass in a fluidized-bed reactor producing a gaseous pyrolysis effluent
Implementation Method 2
catalytic pyrolysis of biomass in the presence of a zeolite catalyst
Implementation Method 3
sending all of the gaseous effluent comprising at least carbon monoxide and carbon dioxide derived from the separation step b) into a fermentation step producing a liquid fermentation stream comprising at least one stream comprising at least one oxygenated compound
Data Source
AI summary
A process is described for producing BTX and alcohols from biomass, by a) catalytic pyrolysis of the biomass in a fluidized-bed reactor producing a gaseous pyrolysis effluent; b) separation of said gaseous pyrolysis effluent into at least one BTX fraction and a gaseous effluent containing at least carbon monoxide and carbon dioxide, c) sending all of the gaseous effluent from separation b) into fermentation producing a liquid fermentation stream containing at least one stream containing at least one oxygenated compound chosen from alcohols, diols, acid alcohols, carboxylic acids, aldehydes, ketones and esters, d) separating the fermentation stream obtained on conclusion of c) into at least the stream containing at least one oxygenated compound, an aqueous fraction, and an unreacted gaseous effluent, e) recycling at least part of unreacted gaseous effluent into the catalytic pyrolysis a).