BTX Production via Catalytic Cracking and Aromatic Ring Opening
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Solution Overview
Problem
The existing process for producing BTX from a hydrocarbon feedstream has a relatively low yield of high-value petrochemical products, limiting the efficiency of aromatic hydrocarbon recovery.
Innovation Solution
The process involves catalytic cracking of a hydrocarbon feedstream to produce catalytic cracking gasoline and cycle oil, followed by aromatic ring opening of the cycle oil in the presence of hydrogen to enhance BTX production, and subsequent recovery of BTX from the catalytic cracking gasoline, utilizing specific catalysts and conditions to optimize BTX yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional catalytic cracking process is used to produce BTX from hydrocarbon feedstream, then the process is simple and well-established, but the yield of high-value petrochemical products is relatively low
Solution Approach 1:
The process segments the hydrocarbon feedstream into different fractions (gasoline fraction and cycle oil fraction) through catalytic cracking, then processes each fraction through different pathways. The gasoline fraction undergoes hydrotreating and fractionation, while the cycle oil fraction undergoes aromatic ring opening, allowing optimized BTX production from each segment
Solution Approach 2:
The process performs preliminary catalytic cracking to produce gasoline and cycle oil fractions before subsequent processing steps. This preliminary separation enables targeted treatment of each fraction to maximize BTX yield - the gasoline fraction is hydrotreated and fractionated, while the cycle oil is subjected to aromatic ring opening
Solution Approach 3:
The process changes key parameters including temperature (400-800°C for catalytic cracking, 200-600°C for aromatic ring opening), pressure (1-25 MPa for hydrotreating), and catalyst composition (zeolites, metal sulfides, transition metals) to optimize BTX production at different process stages
2Productivity
If aromatic ring opening is applied to cycle oil, then BTX production is significantly improved, but additional process units and steps are required
Solution Approach 1:
The catalytic cracking unit serves multiple functions: it cracks the hydrocarbon feedstream into gasoline and cycle oil fractions, and the cycle oil fraction is then universally processed through aromatic ring opening to produce additional BTX. This multi-functional approach maximizes BTX yield from the same feedstream
Solution Approach 2:
The process merges the catalytic cracking unit with the aromatic ring opening unit, where the cycle oil fraction from cracking is directly fed to aromatic ring opening. This integration creates a unified process flow that efficiently converts heavy hydrocarbons to BTX through two complementary reactions
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 improves the yield of BTX, achieving battery-limit BTXE production of over 35 wt-% of the feed, compared to the maximum theoretical production of 28 wt-% in previous methods, by optimizing the conversion and selectivity of aromatics.
Implementation Method 1
subjecting a hydrocarbon feedstream to catalytic cracking to produce catalytic cracking gasoline and cycle oil
Implementation Method 2
subjecting cycle oil to aromatic ring opening in the presence of hydrogen to produce BTX
Data Source
AI summary
The present invention relates to a process for producing BTX comprising catalytic cracking, aromatic ring opening and BTX recovery. Furthermore, the present invention relates to a process installation to convert a hydrocarbon feedstream into BTX comprising a catalytic cracking unit, an aromatic ring opening unit and a BTX recovery unit.