Micro-channel Reactor for Phenol Production via CHP Decomposition
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Solution Overview
Problem
Current phenol production methods face challenges such as complex reaction processes, equipment corrosion, environmental pollution, high maintenance costs, and difficulties in continuous production due to issues like severe corrosion, high heat release, and low decomposition selectivity, particularly in the cumene process.
Innovation Solution
A method utilizing a micro-channel continuous flow reactor for acid catalytic decomposition of cumene hydroperoxide, which involves mixing cumene hydroperoxide with liquid or solid acid in a solvent to form a homogeneous solution, preheating, and then reacting in a series of micro-channel modules to produce phenol, allowing for precise control of reaction conditions and continuous operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional batch reactors are used for CHP decomposition, then equipment size is large and occupies more floor space, but reaction time is long and productivity is low
Solution Approach 1:
The conventional large batch reactor is segmented into multiple micro-channel reactors connected in series. Each micro-channel reactor has a small volume but multiple channels work in parallel, achieving both short reaction time and continuous operation. The segmentation allows the reaction to proceed through multiple stages with controlled residence time in each channel.
Solution Approach 2:
The invention transitions from a single large-volume batch reactor to a multi-channel micro-reactor system. By creating numerous parallel micro-channels, the system achieves high surface-to-volume ratio for efficient heat and mass transfer, enabling continuous flow operation with short residence time while maintaining high productivity.
2Productivity
If sulfuric acid is used for CHP decomposition, then phenol can be produced, but strong acidity causes low selectivity and many byproducts
Solution Approach 1:
The invention changes the chemical parameter by replacing sulfuric acid with solid acid catalysts having different acid strength and distribution characteristics. The solid acid catalysts provide milder catalytic activity that achieves sufficient decomposition selectivity while minimizing side reactions and byproduct formation.
Solution Approach 2:
The solid acid catalyst distributes acid sites throughout the reactor bed rather than concentrating strong acid in one phase. This creates localized catalytic zones with controlled activity, improving selectivity and reducing tar formation while maintaining phenol production efficiency.
3Ease of manufacture
If CHP concentration is increased to reduce sulfuric acid consumption, then acid cost decreases, but operation hazards increase
Solution Approach 1:
The invention uses solid acid catalyst that can be easily separated and reused, replacing the need for large amounts of sulfuric acid. The solid catalyst remains in the reactor while the liquid phase flows through, allowing continuous operation without safety hazards associated with concentrated acid handling and disposal.
Solution Approach 2:
The solid acid catalyst acts as an intermediary that facilitates the decomposition reaction without requiring high CHP concentration. The catalyst provides the necessary acid function in a solid form that can be used at lower CHP concentrations, reducing safety hazards while maintaining production efficiency.
4Ease of operation
If intermittent batch process is used, then reaction can be controlled, but byproducts increase due to long detention time
Solution Approach 1:
The invention converts the intermittent batch process into a continuous flow process through micro-channel reactors. The continuous flow ensures consistent residence time for all reaction batches, preventing over-reaction and byproduct formation. The reaction control is maintained through flow rate adjustment and reactor design while eliminating the downtime and variability of batch operations.
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 significantly shortens reaction time, improves reaction efficiency, reduces solvent consumption, and enhances process safety by avoiding temperature and pressure control issues, while simplifying the operation and reducing equipment hold-up liquid, thus overcoming the limitations of existing processes.
Implementation Method 1
preheating, and then reacting in a series of micro-channel modules
Implementation Method 2
acid catalytic decomposition of cumene hydroperoxide
Implementation Method 3
preliminarily mixing the preheated materials for reaction in a mixing module
Implementation Method 4
continuous flow mode
Data Source
AI summary
The present invention relates to the technical field of peroxide decomposition, and discloses a method for preparing phenol, which comprises the following steps: (1) mixing cumene hydroperoxide and liquid acid or solid acid with a solvent to form a homogeneous solution or uniformly dispersed system; (2) loading the homogeneous solution or uniformly dispersed system of cumene hydroperoxide with a homogeneous solution or uniformly dispersed system of acid into a preheating module and preheating in a micro-channel continuous flow mode, preliminarily mixing the preheated materials for reaction in a mixing module in a micro-channel continuous flow mode, and then further mixing the materials for reaction in a series of mixing and reaction module groups in a micro-channel continuous flow mode, to obtain phenol. The method provided in the present invention is easy, simple and safe to operate, can implement continuous production of phenol product at a high yield ratio; in addition, since the reaction in the present invention is a cracking reaction, which releases heat strongly, the safety factor of the process is significantly improved owing to the strong heat release characteristic in conjunction with the unique heat transfer property of the micro-channels. With the method provided in the present invention, the yield of the product is higher than 99%.