Hydrogen Halide Purification by Oxidative Halogenation of Phenolic Impurities
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Solution Overview
Problem
Industrial processes producing hydrogen halide solutions, such as HBr, are challenged by the presence of phenolic impurities that complicate recycling and utilization, leading to undesirable side products and equipment issues.
Innovation Solution
A process involving oxidative halogenation, typically with bromine or chlorine, converts phenolic residues in hydrogen halide streams into less soluble halogenated compounds, followed by filtration and optional passage through an adsorbent bed to achieve purification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the hydrogen halide byproduct stream is recycled or reused directly, then process efficiency and atom-value utilization are improved, but the presence of phenolic impurities causes undesirable side products and equipment complications
Solution Approach 1:
The patent applies preliminary action by performing oxidative treatment on the byproduct stream before recycling or reuse. The stream is treated with oxidizing agents (nitric acid, peroxide, or chlorine) to convert phenolic impurities into less harmful quinone structures, thereby eliminating the harmful effects that would otherwise occur during subsequent recycling operations
Solution Approach 2:
The patent converts the harmful phenolic impurities into beneficial or neutral quinone structures through controlled oxidation. The phenolic compounds, which cause side products and equipment complications, are transformed into quinones that are less reactive and can be more easily removed or tolerated in the recycled stream
2Object-affected harmful factors
If the byproduct stream is disposed of rather than recycled, then equipment complications from phenolic impurities are avoided, but atom-value is wasted and commercial effectiveness is reduced
Solution Approach 1:
The patent converts the harmful phenolic impurities into beneficial or neutral quinone structures through controlled oxidation. The phenolic compounds, which cause side products and equipment complications, are transformed into quinones that are less reactive and can be more easily removed or tolerated in the recycled stream
3Object-affected harmful factors
If oxidative treatment is applied to the byproduct stream, then phenolic impurities are converted to less harmful substances, but additional process steps and reagents are required
Solution Approach 1:
The patent applies parameter changes by adjusting the oxidation state of the phenolic impurities through controlled addition of oxidizing agents. By carefully controlling the oxidation conditions (type of oxidant, amount added, temperature, and contact time), the phenolic compounds are converted to quinones without requiring overly complex process equipment or multiple treatment stages
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
The process effectively reduces phenolic impurities to low levels, enabling the hydrogen halide solution to be recycled or used in other processes, improving process efficiency and reducing equipment complications.
Implementation Method 1
treating the stream with a halogen, to halogenate the phenolic reside, producing a halogenated phenolic residue
Implementation Method 2
The halogenated solution can be cooled and filtered to remove the halogenated phenolic residue
Implementation Method 3
filtered to remove the halogenated phenolic residue from the halogenated solution to produce a partially purified HX stream
Implementation Method 4
passing the partially purified HX stream across an adsorbent bed, producing a purified HX stream
Data Source
AI summary
The disclosure relates to a novel plant process for purifying hydrogen halide solutions. The process includes halogenating the organic compounds, particularly phenolic compounds, in the hydrogen halide solution to precipitate the halogenated compounds. The halogenated compounds can be filter, the hydrogen halide solution further purified on an adsorbent bed, and the clean hydrogen halide solution can be recycled or used in other processes.