IZM-2 Zeolite Catalyst for Renewable Diesel Cold Resistance
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Solution Overview
Problem
The production of middle distillate fuels from renewable resources faces challenges in achieving high yields while minimizing the production of light cracked products that cannot be incorporated into gas oil and kerosene pools, and in enhancing cold resistance properties.
Innovation Solution
A continuous process using a catalyst comprising hydro-dehydrogenating metals from groups VIB and VIII, supported by IZM-2 zeolite, is employed for the hydroisomerization of paraffinic feedstocks with carbon atoms between 10 and 22, at temperatures between 150°C and 500°C, and pressures between 0.1 MPa and 15 MPa, to produce diesel and kerosene bases with improved branching and cold properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If extensive hydroisomerization is carried out to improve cold properties of hydrotreated liquid effluent, then cold resistance properties are improved, but production of light cracked products increases resulting in yield loss
Solution Approach 1:
The patent changes the chemical parameters of the catalyst by using a specific zeolite structure (IZM-2 with 8-membered ring channels) and controlled Si/Al ratios to modify the hydroisomerization reaction pathway. This selective catalysis promotes isomerization while suppressing cracking reactions, achieving improved cold properties with minimal yield loss.
Solution Approach 2:
The patent employs a composite catalyst system combining IZM-2 zeolite with specific metal components (Group VIII and/or Group VIB metals) to achieve bifunctional activity. The zeolite provides shape-selective acid catalysis for isomerization, while the metal components provide hydrogenation/dehydrogenation functions, together resolving the contradiction between cold property improvement and yield maintenance.
2Stability of the object's composition
If hydroisomerization is carried out to transform n-paraffins into branched paraffins, then cold properties are improved, but cracked products that are too light for gas oil and kerosene pools are produced
Solution Approach 1:
The patent utilizes the porous structure of IZM-2 zeolite with its specific 8-membered ring channel system to impose steric constraints on the reaction. The pore geometry allows n-paraffins to enter and undergo isomerization to branched products, while the channel dimensions restrict the formation and diffusion of lighter cracked fragments, thereby improving composition stability and reducing substance loss.
Solution Approach 2:
The patent creates local quality differences within the catalyst structure by controlling the Si/Al ratio and creating specific active sites within the zeolite framework. This localized catalytic activity promotes isomerization at specific locations while suppressing cracking reactions, achieving high branching with minimal light product formation.
3Use of energy by moving object
If decarboxylation is used to transform fillers into paraffins, then hydrogen consumption is limited, but diesel base yields are reduced
Solution Approach 1:
The patent performs preliminary hydrotreatment to convert triglycerides and fatty acid esters into paraffinic feedstock before the main conversion step. This preliminary saturation of oxygenated compounds creates a paraffinic intermediate that can then be efficiently converted to diesel bases with optimized hydrogen consumption and maximized yield through the subsequent IZM-2 catalyzed process.
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 effectively limits the production of light cracked products, enhances the branching of paraffins, and produces diesel and kerosene bases with low sulfur, nitrogen, and aromatic content, excellent cold holding properties, and reduced density, meeting environmental and quality standards.
Implementation Method 1
the use of a catalyst based on an IZM-2 zeolite in a hydroconversion process of a paraffinic feed produced from renewable resources, makes it possible to obtain good yields of middle distillate base and in particular, to limit the production of light cracked products
Implementation Method 2
a catalyst comprising at least one hydro-dehydrogenating metal chosen from the group formed by the metals of group VIB and group VIII of the periodic table
Data Source
AI summary
The invention relates to a process for converting a paraffinic feed having a number of carbon atoms between 9 and 25, said paraffinic feed being produced from renewable resources, employing a catalyst comprising at least one hydro-dehydrogenating metal selected from the group formed by the metals of group VIB and group VIII of the periodic table, taken alone or in mixture and a support comprising at least one IZM-2 zeolite and at least one binder, said process being carried out at a temperature between 150 and 500°C, at a pressure between 0.1 MPa and 15 MPa, at a space-hour velocity between 0.1 and 10 h-1 and in the presence of a total quantity of hydrogen mixed with the feed such that the hydrogen/feed ratio is between 70 and 2000 Nm3/m3 of feed.