FCC Light Cycle Oil Deep Hydrogenation for Olefin Production
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Solution Overview
Problem
There is a need for improved processes to convert crude oil into basic chemical intermediates like light olefins with higher value and greater economic leverage, as existing methods face challenges in achieving optimal conversion rates and product yields.
Innovation Solution
The process involves deep hydrogenation of light cycle oil from a primary FCC zone, followed by its use as a feedstock in petrochemical production zones, including steam cracking and fluidized catalytic cracking, to produce light olefins and other valuable products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional FCC operations are used to produce light olefins, then some conversion is achieved, but the feed conversion rate remains relatively low
Solution Approach 1:
The patent applies parameter changes by operating the FCC unit at elevated temperatures (500-650°C) and adjusting catalyst composition (using USY zeolite with specific silica/alumina ratios) to enhance feed conversion rate and light olefin yield while controlling secondary reactions
Solution Approach 2:
The patent implements dynamic control of residence time (0.1-2.0 seconds) and catalyst-to-feed ratios to optimize conversion efficiency and prevent excessive cracking, allowing the system to adapt to different feed conditions
2Productivity
If high temperature cracking is used to increase light olefin production, then conversion is enhanced, but dry gas production increases
Solution Approach 1:
The patent optimizes temperature parameters (500-650°C range) and catalyst properties (USY zeolite with controlled pore structure) to maximize light olefin formation while minimizing thermal cracking that produces dry gases
Solution Approach 2:
The patent uses a specific catalyst composition (USY zeolite with controlled silica/alumina ratio and promoter metals) as an intermediary to mediate the cracking reactions, directing the pathway toward light olefins rather than dry gases
3Productivity
If pentasil-type zeolite catalyst is used to enhance light fraction hydrocarbons, then cracking is increased, but gasoline fraction is excessively cracked
Solution Approach 1:
The patent changes catalyst parameters by using USY zeolite with specific silica/alumina ratios (2-10) and controlled pore sizes to selectively crack naphtha fraction while preserving gasoline fraction, avoiding excessive cracking
Solution Approach 2:
The patent applies local quality by using a catalyst with specific regional pore structure characteristics (USY zeolite) that provide different cracking activities for different hydrocarbon fractions, allowing selective cracking of naphtha while protecting gasoline
4Object-generated harmful factors
If short contact time is used in FCC operations, then secondary reactions are reduced, but feed conversion becomes relatively low
Solution Approach 1:
The patent optimizes contact time parameters (0.1-2.0 seconds) and catalyst-to-feed ratios to achieve high feed conversion while maintaining short residence times that minimize secondary reactions and dry gas formation
Solution Approach 2:
The patent implements dynamic adjustment of contact time and catalyst circulation rates to balance conversion efficiency with minimization of unwanted secondary reactions, allowing optimization based on feed composition
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 enhances the conversion of crude oil into light olefins and other petrochemicals, improving economic efficiency and product yields while minimizing secondary reactions, thereby offering a more effective method for petrochemical production.
Implementation Method 1
Deep hydrogenation of light cycle oil from a primary FCC zone enables conversion into feedstocks suitable for petrochemical production
Implementation Method 2
petroleum derived hydrocarbons are catalytically cracked with an acidic catalyst maintained in a fluidized state
Implementation Method 3
Thermal cracking, or steam pyrolysis, is a major type of process for forming these materials, typically in the presence of steam
Data Source
AI summary
A feedstock is processed in an FCC unit to produce at least light olefins, FCC naphtha, light cycle oil and heavy cycle oil. Light cycle oil, and in certain embodiments hydrotreated light cycle oil, is subjected to hydrogenation to produce a deeply hydrogenated middle distillate fraction. All or a portion of the deeply hydrogenated middle distillate fraction is used as feed to a petrochemicals production complex to produce light olefins.