Light Olefin Production via High-Pressure Dehydration
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Solution Overview
Problem
The existing processes for producing light olefins from oxygen-containing compound feedstocks face challenges in increasing output while maintaining yield, requiring lower reaction pressures and larger reactor sizes, which increase costs and pose safety hazards due to inadequate catalyst segregation.
Innovation Solution
Increasing the reaction pressure and weight hourly space velocity (WHSV) of the oxygen-containing compound feedstock within specific intervals, allowing for higher throughput and output of light olefins without increasing reactor size, while ensuring catalyst segregation and safety through the use of a catalyst hopper.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the reaction pressure is lowered to favor chemical equilibrium toward light olefin production, then the yield of light olefins is improved, but the reactor size must be increased to maintain acceptable yield levels, which increases investment and maintenance cost
Solution Approach 1:
The patent changes the reaction pressure parameter from conventional low pressure (0.1-0.3 MPa) to high pressure (0.5-10 MPa, preferably 0.75-3.5 MPa). This parameter change fundamentally alters the reaction conditions, allowing the use of fixed bed reactors with much smaller volumes while maintaining high light olefin yields through the specific combination of high pressure and controlled WHSV (7-250 h⁻¹).
Solution Approach 2:
The patent introduces dynamic control of the weight hourly space velocity (WHSV) parameter, adjusting it within the range of 7-250 h⁻¹ to optimize the reaction process at high pressures. This dynamic adjustment allows the system to maintain high light olefin yields while operating with compact reactor volumes, resolving the contradiction between yield and reactor size.
2Ease of operation
If the reactor and regenerator are operated at substantially the same pressure to facilitate catalyst circulation, then the ease of operation is improved, but the safety hazard increases due to inadequate segregation between hydrocarbon and oxygen-containing atmospheres
Solution Approach 1:
The patent segments the pressure levels between the reaction system and regeneration system. The reaction is conducted at high pressure (0.5-10 MPa) while regeneration occurs at low pressure (0.1-0.5 MPa). This pressure segmentation creates inherent safety by preventing direct communication between the hydrocarbon-rich reaction zone and the oxygen-rich regeneration zone, eliminating the need for complex segregation measures while maintaining ease of catalyst circulation through pressure differential control.
Solution Approach 2:
The patent uses pressure differential as an intermediary mechanism to control catalyst circulation between the high-pressure reaction system and low-pressure regeneration system. The pressure difference drives catalyst flow through controlled valves and pipelines, allowing seamless catalyst transfer while maintaining atmospheric segregation. This intermediary pressure control mechanism resolves the contradiction by enabling easy operation without compromising safety.
3Productivity
If the throughput of oxygen-containing compound feedstock is increased to increase the output of light olefins, then the productivity is improved, but the reactor size must be increased to maintain yield levels, which increases investment cost
Solution Approach 1:
The patent simultaneously changes multiple parameters: reaction pressure (0.5-10 MPa) and WHSV (7-250 h⁻¹). This multi-parameter optimization allows the system to process much higher feedstock throughputs in compact reactor volumes. The high pressure condition enhances reaction efficiency and selectivity, while the optimized WHSV ensures complete conversion, together enabling high productivity without increasing reactor size.
Solution Approach 2:
The patent employs composite catalyst systems with specific compositions and structures that are optimized for high-pressure operation. These composite catalyst materials exhibit enhanced activity and selectivity under high-pressure conditions, allowing the reactor to achieve high light olefin outputs from increased feedstock throughput without requiring proportional increases in reactor volume.
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 maintains or exceeds the yield of light olefins, significantly increases output, reduces reactor size and investment costs, and enhances process safety by segregating hydrocarbon and oxygen-containing atmospheres.
Implementation Method 1
continuously contacting an oxygen-containing compound feedstock and a catalyst to conduct a dehydration reaction
Data Source
AI summary
Disclosed is a process for producing light olefins, the process comprising: continuously contacting an oxygen-containing compound raw material with catalyst to have a dehydration reaction so as to prepare low-carbon alkene, the reaction pressure P of the dehydration reaction being 1-2 MPa, and the weight hourly space velocity H of the dehydration reaction being 15-50 h−1. The process of preparing light olefins has a simple and continuous operation process, reduces investment, greatly increases production of light olefins and has a high safety.