Related Experiment Video
Updated: Jun 28, 2026
07:05
Microwave-Assisted Extraction of Phenolic Compounds and Antioxidants for Cosmetic Applications Using Polyol-Based Technology
Published on: August 23, 2024
Extraction of phenols using polyurethane membrane
1Department of Chemistry, University of Manitoba, Winnipeg, MB R3T 2N2, Canada.
Talanta
|October 31, 2008
Summary
Polyurethane membranes efficiently extract phenols from solutions. Ether-type membranes outperform ester-type due to hydrogen bonding and hydrophobic interactions, optimizing phenol removal.
Area of Science:
- Environmental Chemistry
- Polymer Science
Background:
- Phenolic compounds are common environmental pollutants.
- Efficient methods for phenol extraction are crucial for water remediation.
Purpose of the Study:
- To investigate phenol extraction using polyurethane membranes.
- To determine factors affecting extraction efficiency.
Main Methods:
- Investigated phenol extraction from aqueous and organic solutions using polyurethane membranes.
- Studied the effects of concentration, time, surface area, pH, salts, and temperature.
Main Results:
- Phenols are extracted as neutral species.
- Extraction is influenced by intra- and intermolecular hydrogen bonding and hydrophobic interactions.
- Ether-type polyurethane membranes exhibited higher extraction capability than ester-type membranes.
Conclusions:
- Polyurethane membranes are effective for phenol extraction.
- Membrane chemistry (ether vs. ester) significantly impacts extraction efficiency.
- Understanding interaction mechanisms can optimize phenol removal processes.
Related Concept Videos
01:10Hydrolysis of Chlorobenzene to Phenol: Dow Process
Simple aryl halides do not react with nucleophiles under normal conditions. However, the reaction can proceed under drastic conditions involving high temperatures and high pressure to give the substituted products. For example, chlorobenzene is converted to phenol using aqueous sodium hydroxide at 350 °C under high pressure by the Dow process. The reaction follows an elimination-addition mechanism involving a benzyne intermediate. Here, the chloride ion is eliminated to generate the benzyne...
01:27Benzene to Phenol via Cumene: Hock Process
The synthesis of phenol from benzene via cumene and cumene hydroperoxide is called the Hock process. First, a Friedel–Crafts alkylation reaction of benzene with propene gives cumene. Then cumene forms cumene hydroperoxide via a radical chain reaction. In the chain initiation step, the benzylic hydrogen is abstracted to give a benzylic radical. In the chain propagation step, the benzylic radical reacts with an oxygen diradical to form a cumene hydroperoxide radical. The cumene hydroperoxide...
00:56Extraction: Advanced Methods
Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is formed in...
02:32Physical Properties of Alcohols and Phenols
Alcohols are organic compounds in which a hydroxy group is attached to a saturated carbon. Phenols are a class of alcohols containing a hydroxy group attached to an aromatic ring. The physical properties of the alcohols and phenols are influenced by hydrogen bonding due to the oxygen–hydrogen dipole in the hydroxy functional group and dispersion forces between alkyl or aryl regions of alcohol and phenol molecules.
Alcohols possess a higher boiling point than aliphatic hydrocarbons of similar...
Alcohols possess a higher boiling point than aliphatic hydrocarbons of similar...
01:17Ion Exchange
Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or basic...