Fluidized Bed Reactor Nozzle Configuration for Conjugated Diolefin Production
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing methods for producing conjugated diolefins using oxide catalysts face challenges such as catalyst degradation due to carbon adherence, which complicates the regeneration process and reduces yield, especially in exothermic reactions like oxidative dehydrogenation of butene to 1,3-butadiene, where sudden temperature increases are difficult to control and lead to catalyst damage.
Innovation Solution
A method involving a fluidized bed reaction with specific nozzle configurations and oxygen feed patterns to maintain a high arithmetic mean value, ensuring effective carbon oxidation and suppression on the catalyst surface without the need for regeneration equipment, using an oxide catalyst with molybdenum supported on silica, alumina, or other materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a fixed bed reaction method is used to increase reaction yield, then the gas flow state improves, but heat transfer properties deteriorate and temperature control becomes difficult
Solution Approach 1:
The invention transitions from a fixed bed to a fluidized bed reaction method, where the catalyst particles are suspended and flow dynamically with the gas stream. This dynamic state dramatically improves heat transfer properties while maintaining high reaction yield, resolving the contradiction between productivity and temperature control.
2Productivity
If oxidative dehydrogenation reaction is performed to produce conjugated diolefins, then productivity improves, but carbon adheres to the catalyst causing deterioration
Solution Approach 1:
The invention introduces oxygen-containing gas to the fluidized bed catalyst before the actual oxidative dehydrogenation reaction begins. This preliminary oxidation treatment prevents carbon adherence by creating an oxygen-rich environment on the catalyst surface in advance, thereby maintaining catalyst stability during high-productivity operation.
Solution Approach 2:
The invention utilizes the oxygen-containing gas not only for its intended purpose of oxidation but also converts the potential harmful effect of carbon deposition into a beneficial pre-treatment step. The oxygen exposure before reaction prevents carbon buildup, transforming what would be a degradation mechanism into a protective effect.
3Reliability
If catalyst regeneration is performed to remove carbon, then catalyst performance is restored, but operation becomes complicated and equipment is required
Solution Approach 1:
The invention enables the catalyst to self-regenerate in situ within the fluidized bed reactor by continuous exposure to oxygen-containing gas. The catalyst particles automatically undergo oxidation to remove carbon deposits during normal operation, eliminating the need for external regeneration equipment and complex shutdown procedures.
Solution Approach 2:
The oxygen-containing gas serves multiple functions simultaneously: it acts as a reactant for the oxidative dehydrogenation reaction, a heat transfer medium in the fluidized bed, and a cleaning agent that prevents carbon deposition on the catalyst. This multi-functionality eliminates the need for separate regeneration systems.
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 stabilizes the production of conjugated diolefins with high yield by preventing carbon adherence on the catalyst, maintaining uniform temperature, and avoiding catalyst degradation, thus simplifying the operation and enhancing productivity.
Implementation Method 1
catalytic oxidative dehydrogenation reactions of these monoolefins in contact with molecular oxygen
Implementation Method 2
oxidative dehydrogenation reactions
Implementation Method 3
oxidative dehydrogenation reactions
Implementation Method 4
fluidized bed reaction method is characterized in that catalyst particles flow intensely in a reactor
Implementation Method 5
heat transfer properties are high and the reaction involving large heat generation or heat absorption, the temperature in the reactor can be kept substantially uniform
Implementation Method 6
an oxidative dehydrogenation reaction in which 1,3-butadiene is synthesized from butene is an exothermic reaction with about 30 kcal/mol
Data Source
AI summary
A method for producing a conjugated diolefin is configured as follows. A monoolefin having four or more carbon atoms is fed from a monoolefin feed nozzle(s) installed at n place(s) (n=1, 2, . . . , n). In addition, at least 50% or more of a total amount of an oxygen-containing gas is fed from an oxygen-containing gas feed nozzle located at a bottom of a fluidized bed reactor. Furthermore, the monoolefin feed nozzles at heights a1, a2, . . . , an from the oxygen-containing gas feed nozzle feed the monoolefin having four or more carbon atoms at ratios of b1, b2, . . . , bn (b1+b2+ . . . +bn=1), respectively, and a weighted mean value represented by the following formula and obtained from the above heights and the above ratios is 200 mm to 3000 mm.arithmetic mean value=a1*b1+a2*b2+ . . . +an*bn