Acetylene Hydrogenation Feed Temperature Control
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Solution Overview
Problem
Current acetylene hydrogenation processes in olefin production face challenges with fluctuating hydrogen concentrations due to changes in hydrocarbon feedstocks, leading to thermal runaway and acetylene breakthrough, which affect product quality and safety.
Innovation Solution
The method involves determining hydrogen concentrations in the acetylene hydrogenation unit and adjusting the temperature and CO concentration to maintain desired acetylene target levels, using a heat exchanger to control the hydrogenation feed temperature and adding supplemental CO to stabilize the process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the hydrogen concentration in the feed to the acetylene hydrogenation unit increases due to lighter feedstock, then the acetylene conversion efficiency improves, but the olefin selectivity decreases leading to thermal runaway
Solution Approach 1:
The patent applies dynamics by making the acetylene hydrogenation unit's operating conditions adjustable and responsive to changing feed composition. The system dynamically adapts to varying hydrogen concentrations by modifying operational parameters to maintain safe and efficient operation across different feedstock conditions
Solution Approach 2:
The patent implements parameter changes by adjusting operational parameters (such as temperature, pressure, or catalyst conditions) in response to detected hydrogen concentration levels. This allows the system to optimize acetylene conversion while preventing excessive olefin hydrogenation and thermal runaway
2Object-generated harmful factors
If the hydrogen concentration in the feed to the acetylene hydrogenation unit decreases due to heavier feedstock, then the olefin selectivity improves, but the acetylene conversion efficiency decreases leading to acetylene breakthrough
Solution Approach 1:
The system dynamically adjusts operating parameters based on real-time or monitored hydrogen concentration levels in the feed. This dynamic adaptation ensures that when hydrogen concentration decreases, the system compensates to maintain adequate acetylene conversion while preserving olefin selectivity
Solution Approach 2:
The patent employs feedback mechanisms by monitoring hydrogen concentration in the feed and using this information to adjust operational parameters. This closed-loop control ensures the system responds appropriately to composition changes, maintaining both safety and product quality
3Adaptability or versatility
If the steam cracking unit operates with frequent feedstock changes to respond to market fluctuations, then the adaptability of the olefin production process improves, but the stability of the acetylene hydrogenation unit deteriorates
Solution Approach 1:
The patent makes the acetylene hydrogenation unit dynamic and adaptable to changing feed conditions. By enabling the unit to adjust its operating parameters in response to varying hydrogen concentrations from different feedstocks, the system maintains stability despite frequent upstream changes
Solution Approach 2:
The system achieves universality by designing the acetylene hydrogenation unit to handle multiple feedstock types and compositions. The unit can effectively process feeds with varying hydrogen concentrations from different steam cracking operations, making the overall process versatile while maintaining operational stability
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 reduces the risk of thermal runaway and acetylene breakthrough, ensuring consistent product quality and safety by dynamically adjusting operating conditions in response to feedstock changes.
Implementation Method 1
using a heat exchanger to control the hydrogenation feed temperature
Implementation Method 2
contacting the hydrogenation feed with an acetylene hydrogenation catalyst, the contacting causing hydrogenation of at least a portion of the acetylene of the hydrogenation feed
Implementation Method 3
hydrogenation of at least a portion of the acetylene of the hydrogenation feed to produce a hydrogenation effluent
Implementation Method 4
hydrocarbon cracking (e.g., steam cracking) may be used to produce olefins from a hydrocarbon stream
Data Source
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AI summary
A method for selectively hydrogenating acetylene in a cracked gas from a steam cracking unit for producing olefins may include separating a hydrogenation feed from the cracked gas. The hydrogenation feed may include acetylene, hydrogen, carbon monoxide, and at least one product. The method may further include contacting the hydrogenation feed with an acetylene hydrogenation catalyst, the contacting causing hydrogenation of at least a portion of the acetylene of the hydrogenation feed to produce a hydrogenation effluent. In response to a change in a composition of a feedstock to the steam cracking unit that results in a change in a hydrogen concentration in the hydrogenation feed, the method may further include determining the hydrogen concentration in the hydrogenation feed and increasing or decreasing a temperature of the hydrogenation feed based on the determined hydrogen concentration of the hydrogenation feed.