Bifunctional Catalyst for One-Step Biodiesel Hydrotreatment
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Solution Overview
Problem
Existing processes for converting vegetable oils into diesel fuel are complex and produce undesired by-products, such as aromatic compounds, and require multiple steps, making them inefficient and costly.
Innovation Solution
A one-step hydrotreatment process using a catalytic composition with an amorphous acidic support and a metallic component, specifically an amorphous silica-alumina with a certain Si/Al ratio and a metal from group VIII, such as Pt, to hydrogenate, deoxygenate, and isomerize biological mixtures containing fatty acid esters, resulting in a high content of isoparaffins suitable for diesel fuel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If forced hydrogenation of vegetable oils is performed to produce diesel fuel, then hydrocarbon fractions with compatible boiling points are obtained, but the process produces undesired by-products such as aromatic compounds and requires multiple steps
Solution Approach 1:
The patent combines multiple reaction steps (hydrogenation, deoxygenation, and isomerization) into a single integrated hydrotreatment step using a bifunctional catalyst. This merging of operations eliminates the need for separate processing stages, reducing process complexity while maintaining fuel quality through simultaneous execution of multiple transformations.
Solution Approach 2:
The bifunctional catalyst system performs multiple functions simultaneously: metallic sites conduct hydrogenation and deoxygenation, while acidic sites promote isomerization. This multi-functionality within a single catalytic system resolves the contradiction by achieving comprehensive fuel upgrading in one step rather than requiring sequential specialized processes.
2Reliability
If multiple step processes are used for converting vegetable oils to diesel fuel, then complete transformation is achieved, but the process becomes inefficient and costly
Solution Approach 1:
By merging hydrogenation, deoxygenation, and isomerization into a single hydrotreatment step, the process achieves complete transformation of vegetable oils while eliminating the time and resource costs associated with multiple sequential steps, thereby improving productivity without sacrificing transformation completeness.
Solution Approach 2:
The integrated hydrotreatment process enables continuous transformation of vegetable oils through a single uninterrupted reaction step. The bifunctional catalyst facilitates simultaneous multiple transformations, maintaining continuous useful action rather than requiring intermittent processing stages, thus enhancing overall process efficiency.
3Loss of substance
If conventional hydrogenation processes are used, then oxygen removal is achieved, but high temperatures are required increasing energy consumption
Solution Approach 1:
The patent employs a composite bifunctional catalyst combining metallic components (for hydrogenation and deoxygenation) with acidic components (for isomerization). This composite material enables oxygen removal at lower temperatures by providing multiple active sites that work synergistically, reducing the energy input required compared to conventional single-function catalysts.
Solution Approach 2:
The bifunctional catalyst system changes the reaction parameters by enabling deoxygenation to proceed at lower temperatures through the combined action of metallic and acidic sites. This parameter change from high-temperature conventional processes to lower-temperature catalytic processes directly reduces energy consumption while maintaining effective oxygen removal.
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 process produces a high-quality diesel fuel with a high isoparaffin content, minimizes the formation of undesired by-products, and operates at lower temperatures, making it more efficient and cost-effective compared to prior art methods.
Implementation Method 1
The process comprises hydrotreatment of the mixture of a biological origin in the presence of a catalytic composition comprising: A) an amorphous support of acidic nature... B) a metallic component... to hydrogenate, deoxygenate, and isomerize biological mixtures
Implementation Method 2
the contemporaneous deoxygenation and hydroisomerization is obtained of the biological mixture with the formation of hydrocarbons useful for fuel
Implementation Method 3
The process produces a high-quality diesel fuel with a high isoparaffin content... A) an amorphous support of acidic nature... to hydrogenate, deoxygenate, and isomerize biological mixtures
Data Source
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AI summary
The present invention describes a process for producing, in a single step, hydrocarbon fractions useful as diesel fuel or as a component of diesel fuel, from a mixture of a biological origin containing esters of fatty acids, and possibly also containing aliquots of free fatty acids. The process comprises the contemporaneous hydrodeoxygenation and hydroisomerization of the mixture of a biological origin, with the formation of linear and branched paraffins. The process is carried out in the presence of a catalytic composition comprising: A) an amorphous carrier of an acidic nature, selected from: (1) an amorphous silica-alumina having a SiO2/Al2O3 molar ratio higher than or equal to 5, (2) a porous solid comprising silicon, aluminium, phosphorus and oxygen bonded together so as to form an amorphous mixed oxide forming a single phase, characterized by a Si/Al atomic ratio ranging from 15 to 250, a P/Al ratio of at least 0.1, but lower than 5, preferably ranging from 0.3 to 3.5, a total pore volume of between 0.5 and 2.0 ml/g, an average pore diameter of between 3 nm and 40 nm and a specific surface area ranging from 200 to 1,000 m2/g, preferably from 300 to 900; B) a metallic component containing one or more metals of group VIII, possibly in a mixture with one or more metals of group VIB. If a catalytic composition consisting of a silica-alumina of type (1) and Pt, is used, the composition is pretreated by means of a hydrocarbon containing 7 to 16 carbon atoms, when the silica-alumina is a completely amorphous, micro-mesoporous silica-allumina (1a) having a SiO2/Al2O3 molar ratio comprised between 30 and 500, a surface area greater than 500 m2/g, a pore volume comprised between 0.3 and 1.3 ml/g, an average pore diameter smaller than 40 Å.