Integrated Hydrolysis and Hydroprocessing for Renewable Feedstocks
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Solution Overview
Problem
Current processes for converting renewable feedstocks into biodiesel and glycerol are criticized for producing low-quality diesel, oversupply of glycerol, high investment and operating costs, and inefficiencies in hydrogen use, as well as the inability to handle feedstocks with high metal content without damaging hydroprocessing catalysts.
Innovation Solution
An integrated process combining hydrolysis and hydroprocessing steps to produce paraffins and polyols from glyceride-containing renewable feedstocks, which separates free fatty acids and glycerol, then uses hydrogen in the presence of a hydroprocessing catalyst to convert the free fatty acids into n-paraffins and the glycerol into polyols, reducing hydrogen consumption and allowing the use of feedstocks with high metal content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional hydroprocessing processes are used to convert renewable feedstocks to biodiesel and glycerol, then the production of these chemicals is achieved, but the quality of diesel is low and there is an oversupply of glycerol
Solution Approach 1:
The process segments the conversion pathway by separating free fatty acids and glycerol after hydrolysis, then directing them to different hydroprocessing streams. Free fatty acids are converted to paraffins while glycerol is converted to polyols, eliminating the glycerol oversupply problem and producing high-value chemicals instead of low-quality biodiesel
Solution Approach 2:
The process changes the chemical transformation parameters by using hydroprocessing conditions (temperature, pressure, catalyst) to convert free fatty acids to paraffins and glycerol to polyols, rather than traditional transesterification to biodiesel. This parameter change transforms the product distribution from low-value biodiesel/glycerol to high-value paraffins/polyols
2Productivity
If conventional processes are used for producing transportation fuel from renewable feedstocks, then fuel production is achieved, but investment cost and operating costs are high
Solution Approach 1:
The process merges hydrolysis and hydroprocessing into an integrated flow, where hydrolysis converts triglycerides to free fatty acids and glycerol, which are then directly fed into hydroprocessing units. This integration eliminates intermediate purification steps and reduces capital and operating costs compared to conventional separate processes
Solution Approach 2:
The hydroprocessing unit serves multiple functions: it converts free fatty acids to paraffins for fuel production, converts glycerol to polyols for chemical production, and can handle various feedstock types. This multi-functionality reduces the need for separate dedicated units for different products, lowering overall investment cost
3Manufacturing precision
If hydroprocessing is used to convert feedstocks to fuels, then fuel quality is improved, but hydrogen consumption increases
Solution Approach 1:
The process extracts and separates free fatty acids from glycerol after hydrolysis, then processes them in separate hydroprocessing streams. This extraction allows for optimized hydrogen usage in each stream, converting free fatty acids to paraffins with controlled hydrogen addition while avoiding unnecessary hydrogen consumption that would occur in integrated conventional processes
4Adaptability or versatility
If conventional processes are used, then processing is simple, but feedstocks with high metal content cannot be processed without damaging catalysts
Solution Approach 1:
The process performs preliminary hydrolysis to convert triglycerides to free fatty acids and glycerol before hydroprocessing. This preliminary action separates the feedstock into components that can be processed with less stringent catalyst requirements, allowing the use of feedstocks with higher metal content that would otherwise poison conventional hydroprocessing catalysts
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 process minimizes hydrogen consumption, energy input, and fresh water use, reduces capital and operating costs, and produces a more valuable co-product (polyol) instead of glycerol, while enabling the use of common equipment and handling high-metal feedstocks without catalyst damage.
Implementation Method 1
The free fatty acid stream substantially free of glycerol, water, and metals is reacted with hydrogen from a hydrogen source in a second reaction zone in the presence of a hydroprocessing catalyst under hydroprocessing conditions thereby hydrodeoxygenating the free fatty acid stream substantially free of glycerol, water, and metals to produce a reaction product comprising n-paraffins and water
Implementation Method 2
The glycerol stream substantially free of free fatty acids is reacted with hydrogen from the hydrogen source in a third reaction zone under selective hydrogenation conditions to produce a reaction product comprising polyols
Implementation Method 3
reacting the glyceride containing renewable feedstock with water in a first reaction zone to produce an effluent stream comprising free fatty acids, glycerol, and water
Data Source
AI summary
An integrated process for producing paraffins and polyols from renewable feedstocks has been developed in which a hydrolysis process is integrated with the hydroprocessing step, producing products suitable for use as transportation fuels. Integration allows the use of common equipment which minimizes cost, raw material consumption, and energy requirements.