Activated Carbon Additives for Bitumen Extraction Efficiency
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Solution Overview
Problem
Current bitumen recovery methods from oil sands face inefficiencies due to the use of toxic and corrosive caustic, which requires high dosages and impairs froth treatment, and existing additives do not significantly enhance recovery in low-bitumen content ores.
Innovation Solution
The use of activated carbons alone or in combination with caustic is introduced into the oil sand slurry to condition it, enhancing bitumen separation and recovery by adjusting the pH and reducing the need for high caustic dosages, thereby improving bitumen extraction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If caustic is added to enhance bitumen separation, then bitumen recovery is improved, but the process becomes more toxic and corrosive
Solution Approach 1:
The patent introduces an intermediary substance (activated carbon or alternative additive) that mediates between the bitumen and aqueous phase, enabling effective separation without requiring toxic caustic. The intermediary adsorbs onto bitumen surfaces, modifying interfacial properties and facilitating separation while remaining environmentally benign.
Solution Approach 2:
The patent changes the chemical parameters of the slurry by introducing alternatives to caustic that modify pH and interfacial tension through different mechanisms. This achieves the necessary parameter changes for improved separation while avoiding the harmful effects of traditional caustic additives.
2Productivity
If high dosage of caustic is used to improve bitumen recovery, then separation efficiency increases, but froth treatment is impaired
Solution Approach 1:
The intermediary substance provides a mechanism for bitumen separation that does not rely on high caustic dosages. By adsorbing onto bitumen and modifying interfacial properties, it enables effective separation at lower chemical dosages, thereby maintaining froth treatment effectiveness.
Solution Approach 2:
The patent applies a partial action approach by using lower dosages of alternative additives compared to traditional caustic. This partial action is sufficient to achieve the desired separation effect while avoiding the negative side effects of excessive caustic addition on froth treatment.
3Productivity
If existing additives are used to enhance recovery, then some improvement is achieved, but recovery in low-bitumen content ores remains insufficient
Solution Approach 1:
The patent employs parameter changes by introducing additives that operate through different mechanisms than existing additives. These new additives can effectively modify interfacial properties and adsorb onto bitumen even at low concentrations, enabling successful recovery from low-bitumen content ores where traditional additives fail.
Solution Approach 2:
The patent utilizes composite material approaches by combining activated carbon with other benign substances or by creating composite additive systems. This composite approach enhances the overall effectiveness and adaptability of the treatment, allowing it to perform well across a wide range of ore types including low-bitumen content ores.
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
Activated carbons improve bitumen recovery rates and froth quality, reducing the amount of caustic required and minimizing environmental impact, while achieving higher extraction rates and lower residual contaminants in the water and solids.
Implementation Method 1
The use of activated carbons, or combinations of activated carbons, is introduced into the oil sand slurry to condition it, enhancing bitumen separation and recovery
Implementation Method 2
enhancing bitumen separation and recovery by adjusting the pH
Data Source
AI summary
Methods are provided for separation of bitumen from oil sands ore having a bitumen content higher than about 6%. Activated carbons, or combinations of activated carbons and caustic are used as process additives for ore-water slurry-based bitumen extraction processes or in situ bitumen recovery processes. These additives promote breakdown of adhesion between clay minerals and bitumen, resulting in the enhanced efficiency of extraction of bitumen from oil sands ore.