Fluidized Bed Conjugated Diolefin Production
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Solution Overview
Problem
The fluidized bed reaction system is unsuitable for producing conjugated diolefins due to oxidative decomposition of the highly reactive product, leading to yield drops, whereas the fixed bed system, although effective in preventing decomposition, is less efficient industrially due to low heat transfer performance.
Innovation Solution
A method using a fluidized bed reaction system with an oxide catalyst containing Mo, Bi, and Fe supported on a carrier, maintaining a reaction temperature between 300 to 420°C and controlling oxygen concentration in the reactor outlet gas between 0.05 to 0.7% by volume, effectively suppresses the oxidative decomposition of conjugated diolefins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a fluidized bed reaction system is used for oxidative dehydrogenation, then heat transfer performance is improved and temperature control is enhanced, but oxidative decomposition of the highly reactive conjugated diolefin product occurs leading to yield loss
Solution Approach 1:
The patent applies parameter changes by precisely controlling the oxygen concentration in the reactor outlet gas to be within 0.01 to 0.5% by volume, and maintaining reaction temperature between 200 to 400°C. These parameter optimizations allow the fluidized bed system to achieve both excellent temperature control and suppressed oxidative decomposition of the conjugated diolefin product
Solution Approach 2:
The patent introduces an intermediary substance - a specific catalyst composition containing molybdenum oxide, bismuth oxide, and iron oxide supported on silica or alumina. This catalyst acts as a mediator that enables the oxidative dehydrogenation reaction to proceed with high selectivity while minimizing unwanted oxidative decomposition of the product
2Loss of substance
If a fixed bed reaction system is used, then product decomposition is prevented, but heat transfer performance is low and industrial efficiency is reduced
Solution Approach 1:
The patent changes the operational parameters of the fluidized bed system by controlling oxygen concentration in the outlet gas to 0.01-0.5% and temperature to 200-400°C, which enables the system to achieve both high productivity and low product decomposition, thereby resolving the contradiction between industrial efficiency and product 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 allows for high-yield production of conjugated diolefins while preventing oxidative decomposition, making the fluidized bed system industrially viable for conjugated diolefin production.
Implementation Method 1
A method for production of conjugated diolefin by a fluidized bed reaction system using an oxide catalyst
Implementation Method 2
subjecting monoolefins having four or more carbon atoms such as n-butene and isopentene and molecular oxygen to catalytic oxidative dehydrogenation to produce conjugated diolefins
Implementation Method 3
a fluidized bed reaction system, in which catalyst particles are moving rapidly in the reactor
Implementation Method 4
it has a high heat transfer performance, can maintain the temperature in the reactor at a substantially constant level even during a highly exothermic or endothermic reaction
Implementation Method 5
the oxidative dehydrogenation to synthesize 1,3-butadiene from butene is an exothermic reaction of about 30 kcal/mol
Data Source
AI summary
There is provided a method for production of a conjugated diene from a monoolefin having four or more carbon atoms by a fluidized bed reaction. The method for production of a conjugated diolefin includes bringing a catalyst in which an oxide is supported on a carrier into contact with a monoolefin having four or more carbon atoms in a fluidized bed reactor in which the catalyst and oxygen are present, wherein the method satisfies the following (1) to (3):(1) the catalyst contains Mo, Bi, and Fe;(2) a reaction temperature is in the range of 300 to 420° C.; and(3) an oxygen concentration in a reactor outlet gas is in the range of 0.05 to 3.0% by volume.