Concurrent Isomerization and Hydrogenation of Polyalphaolefin
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Solution Overview
Problem
The existing processes for upgrading unsaturated polyalphaolefin (PAO) to saturated isomerized PAO are costly due to separate steps of isomerization and hydrogenation, and they produce undesirable cracking by-products that affect the quality of the final product.
Innovation Solution
A process that concurrently isomerizes and hydrogenates unsaturated PAO using a catalyst with a zeolite or mesoporous material, incorporating Group VIB to VIIIB metals, which allows for the formation of a high-activity catalyst that operates in a single reactor, reducing costs and minimizing by-product formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate steps of isomerization and hydrogenation are used to upgrade unsaturated PAO, then the PAO can be converted to saturated isomerized PAO with improved properties, but the production cost increases significantly
Solution Approach 1:
The patent combines the isomerization and hydrogenation steps into a single concurrent reaction process using a bifunctional catalyst system. The catalyst contains both acid sites (for isomerization) and metal sites (for hydrogenation), allowing both transformations to occur simultaneously in one reactor, thereby reducing production costs while maintaining product quality.
Solution Approach 2:
The catalyst system is designed to perform multiple functions: it provides acid catalysis for isomerization and metal catalysis for hydrogenation. This multi-functional catalyst eliminates the need for separate processing steps and reduces overall manufacturing complexity and cost.
2Reliability
If separate isomerization step is performed first, then hydrogenation can be carried out, but cracking by-products are formed that affect product quality
Solution Approach 1:
The patent converts the harmful effect of cracking by-products into a benefit by performing hydrogenation concurrently with isomerization. The metal sites on the catalyst provide hydrogenation activity that saturates any cracked olefinic by-products in-situ, transforming them into less harmful saturated hydrocarbons and improving the overall purity of the final product.
Solution Approach 2:
The metal sites on the catalyst act as an intermediary that provides hydrogen to saturate cracked by-products. This intermediary function occurs simultaneously with the isomerization process, preventing the accumulation of harmful unsaturated cracking by-products in the final product.
3Productivity
If conventional catalysts are used for separate isomerization and hydrogenation, then both steps can be completed, but the process requires multiple reactors and higher operational costs
Solution Approach 1:
The patent merges two separate catalytic systems (acid catalyst for isomerization and metal catalyst for hydrogenation) into a single bifunctional catalyst. This consolidation reduces the number of reactors from two to one, simplifies the process flow, and improves overall productivity while reducing capital and operational costs.
Solution Approach 2:
The bifunctional catalyst performs both isomerization and hydrogenation functions within a single catalyst formulation, eliminating the need for multiple specialized catalysts and reactors. This multi-functionality streamlines the process and enhances productivity.
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 significantly lowers production costs, improves selectivity to the desired PAO product, and reduces the pour point of the final product, achieving near complete hydrogenation with minimal cracking by-products.
Implementation Method 1
contacting at least one unsaturated polyalphaolefin with a catalyst capable of both isomerizing and hydrogenating the at least one unsaturated polyalphaolefin to form at least one saturated isomerized polyalphaolefin
Implementation Method 2
The isomerization of the unsaturated PAO is typically performed in the presence of an acid catalyst
Implementation Method 3
the subsequent hydrogenation of the isomerized PAO is performed in a separate reactor containing hydrogen and a metallic hydrogenation catalyst
Data Source
AI summary
Processes for making saturated isomerized polyalphaolefm by concurrently isomerizing and hydrogenating unsaturated polyalphaolefm in the presence of a high activity catalyst. Such processes can include contacting at least one unsaturated polyalphaolefm with a catalyst capable of both isomerizing and hydrogenating the polyalphaolefm, wherein the catalyst includes a zeolite or mesoporous material, the zeolite having a silica to alumina mole ratio of from about 5 to about 100 and an alpha value of from about 10 to about 1,000, and the mesoporous material having a collidine uptake of from about 100 μμmoles/g to about 500 μmoles/g, wherein a Group VIB to VIIIB metal is incorporated in the catalyst at a concentration of from about 0.01 wt % to about 60.00 wt %, and wherein the zeolite is selected from the group consisting of ZSM-48, ZSM-23, ZSM-12, ZSM-35, ZSM-11, ZSM-57, Beta zeolite, Mordenite zeolite, USY zeolite, zeolite having a MWW framework, and combinations thereof.