Pyrolysis Oil Composition for Wax-Related Pour Point Reduction
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Solution Overview
Problem
Pyrolysis oils produced from plastic waste, particularly those derived from polyolefins, face issues with high wax residue that cause increased viscosity and pour point, leading to transportation and storage challenges due to wax crystallization and equipment clogging, and existing solutions like changing reactor design or using special catalysts are costly and inefficient.
Innovation Solution
A composition comprising plastic pyrolysis oil and a polymeric additive, specifically ethylene graft polyalkyl(meth)acrylate, is used to reduce the pour point and viscosity of pyrolysis oil, achieved by grafting onto an ethylene-based copolymer with alkyl (meth)acrylates, thereby inhibiting wax crystallization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If polyethylene and polypropylene are used as feedstock for pyrolysis, then the amount of wax residue produced increases (over 50wt%), but this leads to increased viscosity and pour point, causing transportation and storage difficulties
Solution Approach 1:
A polymeric additive is introduced as an intermediary substance to interact with the wax crystals in the pyrolysis oil. The additive prevents wax crystal formation and growth by acting as a mediator between the wax molecules and the oil matrix, thereby maintaining fluidity without removing the wax content. This resolves the contradiction by allowing high wax residue content while preserving ease of transportation and storage.
Solution Approach 2:
The invention changes the physical-chemical parameters of the pyrolysis oil by adding a polymeric substance that modifies the crystallization behavior of wax. The additive alters the temperature-dependent properties of the oil, specifically lowering the pour point and reducing viscosity at operating temperatures, while maintaining the high wax residue content derived from polyethylene and polypropylene feedstock.
2Ease of operation
If expensive catalysts and special reactor designs are used to reduce wax residue, then the pour point and viscosity decrease, but the manufacturing cost increases significantly
Solution Approach 1:
Instead of investing in expensive, specialized catalysts and reactor designs, the invention uses a relatively inexpensive polymeric additive that can be introduced into the existing pyrolysis oil stream. This additive provides the desired pour point reduction and viscosity control without requiring costly modifications to the manufacturing process, thereby resolving the contradiction between operational ease and manufacturing cost.
Solution Approach 2:
The invention extracts the problem-solving function from the pyrolysis process itself (which would require expensive catalysts and reactor modifications) and separates it into a post-processing step using a simple polymeric additive. This allows the main pyrolysis operation to remain simple and cost-effective while achieving the desired product properties through a separate, low-cost addition.
3Ease of operation
If wax residue is removed through additional processing steps, then transportation and storage become easier, but the productivity and efficiency of the pyrolysis process decrease
Solution Approach 1:
The polymeric additive is introduced into the pyrolysis oil immediately after production, performing the wax-inhibition function in advance before transportation and storage. This preliminary action prevents wax crystal formation during subsequent handling, eliminating the need for additional dewaxing or heating steps and thereby maintaining high processing efficiency while ensuring ease of transportation and storage.
Solution Approach 2:
The polymeric additive provides continuous protection against wax crystallization throughout the entire transportation and storage period. This continuous useful action maintains the fluidity of the pyrolysis oil without requiring intermittent heating or processing interventions, thereby preserving productivity and efficiency while ensuring ease of operation throughout the supply chain.
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
The polymeric additive effectively reduces pour point by at least 1°C and viscosity by up to 60% at temperatures from -20°C to +80°C, improving transportability and storage without requiring reactor modifications or additional processing steps.
Implementation Method 1
The polymeric additive b) reduces the pour point of the pyrolysis oil. The polymeric additive may also reduce the viscosity of the pyrolysis oil... inhibit wax crystallization
Data Source
Figure 1
AI summary
The invention relates to a composition comprising a pyrolysis oil and a polymeric additive for reducing the pour point, viscosity, or both the pour point and viscosity of the pyrolysis oil. The invention further relates to a method of manufacturing said composition, the use of a polymeric additive for reducing the pour point, viscosity, or both the pour point and viscosity of a pyrolysis oil. The invention further relates to a method for transporting or storing a pyrolysis oil.