Phenol Purification via Temperature-Gradient Catalytic Reactors
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Solution Overview
Problem
Current methods for producing phenol struggle to effectively and economically remove hydroxyacetone and methylbenzofuran from crude phenol streams, often requiring additional steps, high energy consumption, or high investment costs, and are not suitable for low activity carbonyl compounds like methylbenzofuran.
Innovation Solution
A continuous method involving a crude phenol stream passed through at least two reactors with an acidic ion exchange resin, where the temperature decreases in flow direction from 100°C to 50°C, allowing for effective removal of hydroxyacetone and methylbenzofuran without prior removal or additional distillation steps, optimizing catalyst activity and selectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If hydroxyacetone is removed by prior distillation or additional processing steps, then purity of phenol is improved, but device complexity and energy consumption increase
Solution Approach 1:
The patent combines the removal of hydroxyacetone and methylbenzofuran into a single catalytic treatment step using acidic ion exchange resin, eliminating the need for separate distillation steps or additional processing units. This merging of functions reduces device complexity while maintaining high phenol purity.
Solution Approach 2:
The patent extracts and removes the problematic impurities (hydroxyacetone and methylbenzofuran) from the crude phenol stream through a dedicated catalytic treatment step, separating these specific components without requiring complete distillation of the entire stream, thus reducing overall processing complexity.
2Manufacturing precision
If multiple distillation steps are used to remove hydroxyacetone and methylbenzofuran, then purity of phenol is improved, but energy consumption increases
Solution Approach 1:
The patent changes the approach from thermal separation (distillation) to catalytic conversion, using temperature-controlled catalytic treatment at 50-150°C to convert hydroxyacetone and methylbenzofuran into separable products. This parameter change from high-energy distillation to low-energy catalysis significantly reduces energy consumption while achieving the same purification goal.
Solution Approach 2:
The patent replaces the mechanical/thermal separation system (distillation columns requiring large energy input) with a chemical catalysis system using acidic ion exchange resin. This substitution eliminates the need for multiple high-energy distillation steps, reducing energy consumption while maintaining purification effectiveness.
3Ease of operation
If conventional catalytic treatment is used at constant temperature, then simplicity of operation is maintained, but removal efficiency of both hydroxyacetone and methylbenzofuran is insufficient
Solution Approach 1:
The patent introduces dynamic temperature control in stages: initial treatment at 50-150°C to remove hydroxyacetone, followed by treatment at 150-250°C to remove methylbenzofuran. This dynamic, multi-stage temperature approach optimizes removal efficiency for different impurities while maintaining operational simplicity through automated stage control.
Solution Approach 2:
The patent segments the catalytic treatment process into distinct temperature stages, each optimized for removing specific impurities. The first stage (50-150°C) targets hydroxyacetone, while the second stage (150-250°C) targets methylbenzofuran. This segmentation improves overall removal efficiency without significantly complicating operation, as each stage can be independently controlled.
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 achieves low concentrations of hydroxyacetone and methylbenzofuran without initial removal or distillation, reducing overall reactor volume and energy consumption, while maintaining high purity phenol production with constant efficiency over time.
Implementation Method 1
passing the crude phenol stream through at least two reactors connected in series, the reactors containing an acidic ion exchange resin
Implementation Method 2
the temperature in successive reactors decreases in flow direction of the phenol stream so that the temperature in the first reactor in flow direction of the phenol stream is between 100° C. and 200° C. and the temperature in the last reactor in flow direction of the phenol stream is between 50° C. and 90° C.
Data Source
AI summary
The present invention relates to a continuous method for treating a crude phenol stream comprising methylbenzofuran and hydroxyacetone by passing the crude phenol stream through at least two reactors connected in series the reactors containing an acidic ion exchange resin, whereby the temperature in successive reactors decreases in flow direction of the phenol stream so that the temperature in the first reactor in flow direction of the phenol stream is between 100° C. and 200° C. and the temperature in the last reactor in flow direction of the phenol stream is between 50° C. and 90° C. without a thermal separation step between any of two successive reactors and to the use of this method in a process for making phenol.