DMBA Conversion to CHP in Cumene Oxidation
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Solution Overview
Problem
Current methods for producing phenol and acetone result in high levels of by-products, particularly hydroxyacetone, and inefficient yield optimization due to incomplete conversion of dimethyl benzyl alcohol to cumene hydroperoxide.
Innovation Solution
A system comprising an oxidation reactor, a conversion reactor where dimethyl benzyl alcohol is converted to cumene hydroperoxide in both organic and aqueous phases, and a cleavage reactor to produce phenol, acetone, and alpha-methylstyrene, allowing for controlled DMBA conversion to CHP, thereby optimizing phenol and acetone yield while minimizing by-products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dimethyl benzyl alcohol is directly decomposed in the presence of sulfuric acid at 55-80°C, then cumene hydroperoxide is produced, but the conversion efficiency is low and by-products increase
Solution Approach 1:
The patent divides the single-stage decomposition process into two distinct stages: first decomposing cumene hydroperoxide at 55-80°C, then decomposing dimethyl benzyl alcohol at 80-146°C with added acetone. This segmentation allows optimal conversion of DMBA to CHP while minimizing by-product formation through controlled temperature and composition conditions in each stage.
Solution Approach 2:
The patent performs preliminary decomposition of cumene hydroperoxide before decomposing dimethyl benzyl alcohol. By first converting CHP to phenol and acetone, the system creates favorable conditions for subsequent DMBA decomposition, preventing direct unwanted reactions and improving overall conversion efficiency while reducing by-products.
2Loss of substance
If a two-stage decomposition process is used with acetone addition, then by-product formation is reduced, but the process complexity increases
Solution Approach 1:
The patent combines the decomposition of cumene hydroperoxide and dimethyl benzyl alcohol into a unified two-stage process within the same reactor system, with acetone addition serving dual purposes: as a reaction product from the first stage and as a necessary component for the second stage. This merging approach reduces equipment complexity while maintaining the benefits of staged decomposition.
Solution Approach 2:
The patent maintains continuous useful action by using the acetone produced in the first decomposition stage and adding it back to the second stage. This continuous utilization of reaction products eliminates waste steps and reduces overall process complexity while effectively minimizing by-product formation throughout the continuous process.
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
Achieves greater than 90% conversion of DMBA to CHP, reducing heavy by-products and optimizing the yield of phenol and acetone, with the potential to produce Bisphenol A and para-cumylphenol.
Implementation Method 1
converting at least a portion of the dimethyl benzyl alcohol to cumene hydroperoxide by reacting the at least a portion of the dimethyl benzyl alcohol with hydrogen peroxide
Implementation Method 2
oxidation of cumene with atmospheric oxygen, followed by the acid-catalytic decomposition of cumene hydroperoxide
Implementation Method 3
acid-catalytic decomposition of cumene hydroperoxide
Implementation Method 4
acid-catalytic decomposition of cumene hydroperoxide
Data Source
AI summary
Systems and methods for the production of phenol and acetone from cumene oxidation products. One method includes reacting cumene and an oxidizing agent to produce a cumene oxidation product including cumene hydroperoxide and dimethyl benzyl alcohol, converting at least a portion of the dimethyl benzyl alcohol to cumene hydroperoxide by reacting the at least a portion of the dimethyl benzyl alcohol with hydrogen peroxide in both an organic phase and an aqueous to produce a converted cumene oxidation product, and cleaving the converted cumene oxidation product to produce an output product including one or more of phenol, acetone, and alpha-methylstyrene.