HTL Biocrude Water Separation via Thermal Phase Change
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Solution Overview
Problem
Current hydrothermal liquefaction systems face inefficiencies in separating biocrudes from water by-products due to the formation of complex emulsions and the need for additional solvents and chemicals, which complicate downstream processing and reduce energy efficiency.
Innovation Solution
A system and process that includes a separation stage for removing insoluble inorganic compounds, a cooling stage for phase separation of biocrude and water, and an oil/water separator to achieve efficient separation without extraction solvents, along with an upgrade stage to form green crude, utilizing specific temperature and pressure conditions to optimize the separation of biocrude from water by-products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional separation methods are used to separate biocrudes from water by-products, then separation can be achieved, but additional solvents and chemicals are required which complicate downstream processing and reduce energy efficiency
Solution Approach 1:
The patent changes the temperature parameter from ambient to elevated temperatures (e.g., 50-150°C) during separation. This temperature increase modifies the physical properties of the biocrude-water mixture, reducing emulsion stability and enabling phase separation without requiring additional solvents or chemicals, thus resolving the contradiction between separation effectiveness and processing complexity
Solution Approach 2:
The patent replaces chemical separation methods (using solvents and acids) with a thermal-mechanical approach. By applying heat and maintaining specific pressure conditions, the system achieves separation through physical phase behavior changes rather than chemical reactions, eliminating the need for downstream chemical processing steps
2Reliability
If conventional separation methods are used to separate biocrudes from water by-products, then separation can be achieved, but energy efficiency is reduced due to the need for additional chemicals and processing steps
Solution Approach 1:
The patent utilizes temperature as a key parameter to drive the separation process. By operating at elevated temperatures (50-150°C) and specific pressures, the system leverages thermal energy to reduce viscosity and stabilize phase separation, eliminating the need for energy-intensive chemical processing steps and improving overall energy efficiency
Solution Approach 2:
The patent enables continuous operation where the thermal field remains active throughout the separation process. The heated environment maintains favorable phase behavior continuously, allowing for sustained separation without intermittent chemical additions or multiple processing stages, thereby reducing cumulative energy consumption
3Quantity of substance
If conventional processing is used, then biocrudes can be extracted from water by-products, but complex emulsions form that reduce recovery and yields
Solution Approach 1:
The patent changes the temperature parameter to 50-150°C and maintains specific pressure conditions during separation. These parameter changes fundamentally alter the emulsion stability by reducing interfacial tension and promoting phase coalescence, enabling complete biocrude recovery without the emulsion formation problems that occur at ambient conditions
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 enables clean and efficient separation of biocrude and water by-products, minimizing emulsion formation and enhancing energy efficiency, allowing for higher yields and reduced energy consumption in the hydrothermal liquefaction process.
Implementation Method 1
a cooling stage configured to cool the product mixture at the second pressure to a second temperature that phase separates the biocrude in the HTL product mixture from the water by-product
Implementation Method 2
a separation stage for settling and removing insoluble inorganic compounds and/or mineral solids present in the HTL product mixture
Implementation Method 3
Separation stage may include a filter that prevents passage of insoluble solids from the separation stage into the HTL product mixture
Data Source
AI summary
A system and process are described for clean separation of biocrudes and water by-products from hydrothermal liquefaction (HTL) product mixtures of organic and biomass-containing feedstocks at elevated temperatures and pressures. Inorganic compound solids are removed prior to separation of biocrude and water by-product fractions to minimize formation of emulsions that impede separation. Separation may be performed at higher temperatures that reduce heat loss and need to cool product mixtures to ambient. The present invention thus achieves separation efficiencies not achieved in conventional HTL processing.