Stabilizing Depolymerized Diesel Oil via Deinking Distillation
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Solution Overview
Problem
Heating and diesel oils obtained through depolymerization or pyrolysis processes darken over time, leading to unacceptable color changes and reduced storage stability, which existing methods fail to address effectively without using hazardous antioxidants or complex hydrogenation processes.
Innovation Solution
Subjecting the darkened oils to a deinking distillation process, either by storing them under protective conditions or accelerating oxidation followed by distillation in a thin-film evaporator at controlled temperatures and pressures, to produce a clear and stable product.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the oil is stored under normal conditions, then the storage stability is maintained, but the color darkens over time making the product unacceptable to customers
Solution Approach 1:
The patent applies preliminary action by performing distillation before the darkening becomes severe. The oil is distilled shortly after production to remove coloring agents before they can fully develop, preventing the color deterioration problem while maintaining storage stability.
Solution Approach 2:
The patent extracts harmful coloring agents from the oil through distillation. By separating the volatile coloring components from the base oil, the method removes the cause of darkening while preserving the useful fuel properties, resulting in a permanently clear product.
2Stability of the object's composition
If antioxidants are added to prevent polymerization, then the storage stability is improved, but hazardous substances are introduced into the product
Solution Approach 1:
The patent applies self-service by using the oil's own properties to stabilize it. Through distillation, the oil is separated into fractions that inherently resist polymerization and darkening, eliminating the need for external antioxidant additives and their associated hazards.
Solution Approach 2:
The patent converts the harmful effect of oxidation into a beneficial separation process. By allowing controlled oxidation during storage followed by distillation, the harmful oxidized components are separated from the base oil, actually improving stability without requiring additives.
3Illumination intensity
If complex hydrogenation processes are used to remove coloring, then the color brightness is improved, but the device complexity and process cost increase
Solution Approach 1:
The patent uses a simple, inexpensive distillation process instead of complex hydrogenation equipment. The distillation setup is relatively simple and can be operated at lower temperatures, reducing both device complexity and operational costs while achieving the desired color brightness.
Solution Approach 2:
The patent changes the operational parameters from high-temperature hydrogenation to lower-temperature distillation. By operating at reduced temperatures and using simple fractional distillation instead of complex catalytic hydrogenation, the method achieves color removal with much simpler equipment and lower costs.
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 method consistently yields a permanently clear and stable diesel or heating oil, meeting DIN standards, and can be applied to both diesel and pyrolysis oils, ensuring long-term usability without hazardous additives.
Implementation Method 1
distillation or renewed distillation (hereinafter also referred to as deinking distillation)
Implementation Method 2
the component that occurs in vapor form is then condensed
Implementation Method 3
passed in a thin-film evaporator kept at negative pressure as a thin film over an evaporator surface at about 180 to 240 degrees C
Implementation Method 4
The thin film evaporation takes place under an absolute pressure of about 1 to 500 mbar, preferably 2 to 100 mbar
Data Source
AI summary
The method involves allowing or promoting a dark discoloration of diesel oil, and heating oil or pyrolysis oil. The diesel oil is discolored, and the heating oil or pyrolysis oil is subjected to a distillation step with elimination of the dark color. The heating oil or diesel oil to be stabilized is obtained by fractional distillation of a vapor phase from a process of depolymerization of hydrocarbon-containing residues. The dark discoloration is delayed or checked during an intermediate storage phase before distillation of the heating.