IZM-2 and MFI Zeolite Catalyst for Deparaffinning Middle Distillates
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current deparaffining processes for middle distillate feedstocks with high pour points either result in low yields due to excessive cracking of paraffins or fail to effectively lower pour points, leading to suboptimal product quality for diesel and kerosene production.
Innovation Solution
A process using a catalyst comprising a combination of IZM-2 zeolite with isomerizing activity and MFI framework type zeolites, such as ZSM-5, in a hydro-dehydrogenating phase with metals from groups VIB and VIII, operating under specific temperature, pressure, and hydrogen-to-feedstock ratios, to achieve synergistic isomerization and cracking, thereby reducing pour points while maintaining high yields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If selective cracking of longest linear paraffinic chains is performed using ZSM-5 zeolite, then pour point values are reduced, but large amounts of low molecular weight products (butane, propane, ethane, methane) are formed which considerably reduces the yield of desired products
Solution Approach 1:
The patent combines two different zeolite types (IZM-2 and MFI framework type) with complementary functions into a single catalyst system. IZM-2 provides isomerization capability while MFI provides cracking activity, allowing simultaneous isomerization and cracking to occur in one process step, thereby reducing pour point while improving yield compared to using either zeolite alone
Solution Approach 2:
The catalyst is a composite material consisting of two distinct zeolite phases (IZM-2 and MFI framework type zeolite) with different pore structures and catalytic properties. This composite structure enables the catalyst to perform multiple functions (isomerization and cracking) with different selectivities, resolving the contradiction between pour point reduction and yield maintenance
2Temperature
If isomerization of linear paraffins is performed to improve cold resistance, then pour point values are lowered and cracking is minimized, but the activity and selectivity are insufficient compared to cracking catalysts alone
Solution Approach 1:
The patent merges the isomerization function (provided by IZM-2 zeolite) with the cracking function (provided by MFI framework type zeolite) in a single catalyst system. This combination allows the process to benefit from both isomerization (for pour point reduction) and cracking (for activity and selectivity enhancement), achieving superior performance compared to using isomerization catalyst alone
Solution Approach 2:
The composite catalyst system combines IZM-2 zeolite with MFI framework type zeolite to create a material that exhibits both isomerization and cracking activities. The MFI component enhances the overall activity and selectivity of the catalyst system while the IZM-2 component ensures effective isomerization for pour point reduction, achieving a synergistic effect
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 lowers the pour point of middle distillate feedstocks while maintaining high yields of desired products, outperforming standalone isomerizing or cracking zeolite catalysts by enhancing selectivity and activity through a synergistic effect.
Implementation Method 1
the use of a catalyst including a combination of at least one IZM-2 zeolite having isomerizing activity and of at least one zeolite of MFI framework type code having cracking activity in a process for the deparaffinning of a middle distillate feedstock makes it possible to substantially lower the pour point of said feedstock
Implementation Method 2
Selective cracking of the longest linear paraffinic chains, which leads to the formation of compounds of lower molecular weight
Implementation Method 3
at least one catalyst comprising at least one hydro-dehydrogenating phase containing at least one metal from group VIB and at least one metal from group VIII of the Periodic Table of the Elements
Data Source
AI summary
The present invention relates to a process for deparaffinning a middle distillate feedstock, to convert, in good yield, feedstocks having high pour points into at least one cut having an improved pour point.Said process is performed with at least one catalyst comprising at least one hydro-dehydrogenating phase containing at least one metal from group VIB and at least one metal from group VIII of the Periodic Table of the Elements, and a support comprising at least one IZM-2 zeolite, a zeolite of WI framework type code and at least one binder.