Conjugated Diolefin Production via Oxidative Dehydrogenation
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Solution Overview
Problem
Conventional methods for producing high purity conjugated diolefin, such as butadiene, from butene via oxidative dehydrogenation face inefficiencies due to the presence of inert gases and the adsorbent's reduced dehydration capability, leading to complex and energy-inefficient processes.
Innovation Solution
A method involving the oxidative dehydrogenation of a C4 or higher monoolefin, followed by liquefaction, rinsing with water to remove acetaldehyde, and subsequent absorption and stripping with solvents to achieve high purity butadiene, utilizing a catalyst with Mo, Bi, and Fe for efficient removal of impurities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If distillation is used to separate moisture from the reaction gas, then moisture removal is achieved, but large amounts of inert gases must also be liquefied requiring extremely high compressibility which is energy inefficient
Solution Approach 1:
The patent extracts and removes inert gases (nitrogen, oxygen, carbon dioxide) from the reaction gas before the moisture separation step. By taking out these inert components first, the subsequent distillation process only needs to handle the reactive components, dramatically reducing the compression energy required while maintaining effective moisture removal capability.
2Reliability
If adsorption dehydration is used to remove moisture, then dehydration is achieved, but the adsorbent also adsorbs high boiling components reducing dehydration capability and requiring frequent switchover operations
Solution Approach 1:
The patent removes high boiling components from the reaction gas before the adsorption dehydration step. By extracting these interfering substances first, the adsorbent maintains its dehydration capability for extended periods without being blocked by high boiling components, eliminating the need for frequent switchover operations and simplifying the overall process.
3Reliability
If water extraction is used to remove acidic components, then some removal is achieved, but the column diameter must be made large to assure sufficient extraction amount which expands construction costs
Solution Approach 1:
The patent introduces an alkaline substance as an intermediary that chemically reacts with acidic components to form salts. This chemical mediation dramatically increases removal efficiency compared to physical dissolution in water, allowing sufficient acidic component removal in a much smaller column diameter, thereby reducing construction costs.
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 method efficiently produces high purity butadiene by effectively removing acetaldehyde and other impurities, improving energy efficiency and extending adsorbent lifespan, thus simplifying the production process.
Implementation Method 1
bringing a catalyst into contact with the gas mixture, compressing a gas containing a conjugated diolefin produced by an oxidative dehydrogenation reaction
Implementation Method 2
rinsing the liquefied gas with water... the aldehyde contained in the cooled gas is removed
Implementation Method 3
compressing a gas containing a conjugated diolefin produced by an oxidative dehydrogenation reaction to obtain a liquefied gas
Data Source
AI summary
An object of the present invention is to provide a method for production of a high purity conjugated diolefin. The method for production of a conjugated diolefin of the present invention comprises steps of supplying a source gas containing a C4 or higher monoolefin and an oxygen-containing gas into a reactor, bringing a catalyst into contact with the gas mixture, compressing a gas containing a conjugated diolefin produced by an oxidative dehydrogenation reaction to obtain a liquefied gas and rinsing the liquefied gas with water.