Hydrotreatment Unit Segmentation for Exothermic Oil Conversion
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Solution Overview
Problem
The highly exothermic nature of hydroconversion reactions in hydrotreatment processes using organic oils of animal and/or plant origin mixed with mineral oil poses challenges, including excessive temperature increases that can shorten the service life of hydrotreatment units and limit the quantity of plant oil in the feedstock.
Innovation Solution
A process involving a conventional hydrotreatment unit with at least two catalyst beds, where mineral oil is injected upstream of the first bed and organic oils are injected after the first bed, allowing for independent rate adjustments, to manage the exothermic reactions and produce diesel fuel with improved qualities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If organic oils of animal and/or plant origin are injected into the first catalyst bed for hydroconversion, then the production of diesel fuel with improved cetane number and density is achieved, but the highly exothermic nature of the reactions causes excessive temperature increase that shortens the service life of the hydrotreatment unit
Solution Approach 1:
The patent applies segmentation by dividing the injection of organic oils into two separate stages: first injecting mineral oil into the first catalyst bed, then injecting organic oils into subsequent catalyst beds (second, third, or fourth beds). This segmentation prevents the highly exothermic reactions from occurring in the first bed, thereby controlling temperature increase and extending the service life of the hydrotreatment unit while still achieving the desired cetane number improvement in the final diesel fuel product.
2Manufacturing precision
If organic oils of animal and/or plant origin are injected into the first catalyst bed for hydroconversion, then the production of diesel fuel with improved cetane number and density is achieved, but the temperature increase complicates operation and limits the quantity of plant oil in the feedstock
Solution Approach 1:
The patent segments the feedstock injection process by separating mineral oil and organic oil injections into different catalyst beds. This allows independent control of reaction conditions for each feedstock type, simplifying operation by preventing the complex temperature management issues that would arise from mixing both feedstocks in the first bed. The segmentation enables higher proportions of organic oils (up to 30% by weight) to be processed without operational complications.
3Manufacturing precision
If organic oils of animal and/or plant origin are injected into the first catalyst bed for hydroconversion, then the production of diesel fuel with improved cetane number and density is achieved, but the highly exothermic reactions decrease the service life of the HDT unit
Solution Approach 1:
The patent implements segmentation by injecting organic oils into catalyst beds after the first bed (specifically the second, third, or fourth beds), rather than mixing them with mineral oil in the first bed. This segmentation strategy ensures that the highly exothermic hydroconversion reactions of organic oils occur in subsequent beds where the temperature increase does not compromise catalyst life, thereby extending the service life of the HDT unit while still achieving improved cetane index in the final diesel fuel product.
4Manufacturing precision
If organic oils of animal and/or plant origin are injected into the first catalyst bed for hydroconversion, then the production of diesel fuel with improved cetane number and density is achieved, but the highly exothermic nature of the reactions limits the quantity of plant oil in the feedstock
Solution Approach 1:
The patent applies segmentation by separating the injection points of mineral oil and organic oils into different catalyst beds. This allows organic oils to be injected at higher quantities (up to 30% by weight of total feedstock) into subsequent beds without the temperature control issues that would limit plant oil content if injected into the first bed. The segmentation enables increased quantity of plant oil processing while maintaining product quality.
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 minimizes the adverse effects of exothermic reactions, extends the service life of the hydrotreatment unit, and increases the global production of diesel fuel with enhanced cetane number and density, while maintaining the integrity of the catalyst bed.
Implementation Method 1
passing a stream of hydrocarbon together with a stream of hydrogen inside a fixed bed catalytic reactor
Implementation Method 2
hydroconversion reactions in the presence of a stream comprising hydrogen
Implementation Method 3
the highly exothermic nature of the hydroconversion reactions can represent an exaggerated increase in temperature
Implementation Method 4
the reactor operates adiabatically, the temperature rises along the catalyst bed, due to the large dimensions involved
Implementation Method 5
a stream of recycled hydrogen can be injected in order to decrease the inlet temperature of the subsequent bed
Data Source
Figure 1
AI summary
A process is described for hydroconversion of a mixture of organic oils of different origins in a conventional hydrotreatment unit, constituted by at least two catalyst beds, under moderately severe process conditions to obtain diesel fuel oil. The process includes injection of a stream of oil of animal or plant origin, with independently adjusted flow rates, from the second catalyst bed of the hydrotreatment unit onwards, in accordance with the variations in temperature observed in each of the catalyst beds after the first bed. The process is applicable to conventional hydrotreatment units, and makes it possible to overcome the effects of the highly exothermic nature of hydroconversion reactions in oils of animal and/or plant origin in hydrotreatment process for obtaining specified diesel fuel oil.