Hydroisomerization Process for Low-Sulfur Fluid Cold Properties
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Solution Overview
Problem
Existing processes for producing hydrocarbon fluids with good cold properties often require sulfurized catalysts or feeds with substantial sulfur content, which can lead to catalyst deactivation and safety concerns.
Innovation Solution
A three-step process involving hydrodearomatization and hydroisomerization of a feedstock with less than 10 ppm by weight of sulfur, using platinum or palladium catalysts, to produce fluids with improved cold properties without the need for sulfurized catalysts or sulfur-rich feeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If sulfurized catalysts or sulfur-rich feeds are used to produce hydrocarbon fluids with good cold properties, then the cold properties (pour point) are improved, but catalyst deactivation occurs and safety concerns arise
Solution Approach 1:
The patent changes the chemical state parameters of the catalyst from sulfided form to non-sulfided form (platinum or palladium on silica-alumina), and modifies the feedstock parameter by using low sulfur content feed (less than 10 ppm sulfur). This parameter change resolves the contradiction by achieving good cold properties through hydroisomerization without catalyst deactivation or safety concerns associated with sulfur.
2Reliability
If narrow cuts are used to achieve narrow flash point and better defined fluid properties, then safety and fluid property definition are improved, but the process complexity increases
Solution Approach 1:
The patent segments the hydrocarbon feedstock into narrow boiling point range cuts (e.g., 120-300°C initial boiling point to 310-600°C final boiling point) to achieve narrow flash point and well-defined fluid properties. This segmentation allows control over safety parameters and fluid characteristics while managing process complexity through targeted processing of specific boiling range fractions.
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 reduces the aromatic content and improves the pour point of the products, achieving satisfactory cold properties while avoiding sulfur use and minimizing catalyst deactivation.
Implementation Method 1
a) Hydrodearomatizing the feedstock at a temperature ranging from 150 to 220° C. and at a pressure ranging from 20 to 150 bars, in order to provide a dearomatized product
Implementation Method 2
b) Hydroisomerizing the dearomatized product at a temperature ranging from 250 to 320° C. and at a pressure ranging from 40 to 60 bars in the presence of a catalyst based on platinum or palladium, in order to provide an isomerized product
Data Source
AI summary
The invention is a process for dearomatization and isomerization of a feedstock having less than or equal to 10 ppm by weight of sulphur, the process comprising:Hydrodearomatizing the feedstock at a temperature ranging from 150 to 220° C. and at a pressure ranging from 20 to 150 bars, in order to provide a dearomatized product;Hydroisomerizing the dearomatized product at a temperature ranging from 250 to 320° C. and at a pressure ranging from 40 to 60 bars in the presence of a catalyst based on platinum or palladium, in order to provide an isomerized product;Hydrodearomatizing the isomerized product at a temperature ranging from 150 to 220° C. and at a pressure ranging from 20 to 150 bars, in order to provide an isomerized and dearomatized product.