协同计算和实验研究共价有机框架,以实现高效的酒精脱水
Krishna M Gupta1,2, Srinivasulu Aitipamula1, Xavier Chin1
1Institute of Sustainability for Chemicals, Energy and Environment (ISCE2), Agency for Science, Technology and Research (A*STAR), 1 Pesek Road, Jurong Island, Singapore 627833, Republic of Singapore.
ACS applied materials & interfaces
|April 24, 2025
概括
新的共价有机框架 (COFs) 经过计算设计,并经过实验验证,以实现高效的酒精脱水. 开发的COF膜在分离水/酒精混合物方面表现出卓越的性能,促进了可持续的溶剂回收.
科学领域:
- 材料科学 材料科学 材料科学
- 化学工程是化学工程的重要组成部分.
- 纳米技术 纳米技术
背景情况:
- 聚合有机框架 (COF) 是先进的纳米孔状材料,具有显著的膜分离潜力.
- 现有的基于COF的膜难以有效地分离小分子混合物,特别是在酒精脱水过程中.
- 开发高性能膜对于可持续的溶剂回收过程至关重要.
研究的目的:
- 通过计算探索和识别新型的COF,以实现水/酒精混合物的有效蒸发 (PV).
- 通过实验合成,描述和验证最有前途的COF膜的性能.
- 通过分子动力学 (MD) 模拟,阐明管理膜性能的结构-属性关系.
主要方法:
- 用于光伏应用的不同功能和孔径的各种COF的计算选.
- 选择COF的实验合成和表征,包括吸附研究和形态分析.
- 分子动力学 (MD) 模拟来研究溶剂透机制和能量障碍.
主要成果:
- 一种新的COF,TpPa-1-OC3H6OCH3,在脱水水/酒精混合物 (IPA,n-butanol,t-butanol) 中表现出卓越的性能.
- MD模拟显示,孔隙孔径决定了流量,而功能组极性则决定了分离因子.
- 与现有的最先进的膜相比,TPPa-1-OC3H6OCH3表现出更好的性能,这是由于其最佳孔径大小和功能.
结论:
- 该研究成功地整合了计算和实验方法,开发了一种用于酒精脱水的高性能COF膜.
- TpPa-1-OC3H6OCH3为有效和可持续的溶剂回收提供了一个有希望的解决方案,其性能优于之前报告的光伏膜.
- 这些发现为设计针对特定分离挑战的先进COF膜提供了一条途径.
相关概念视频
02:29Ethers from Alcohols: Alcohol Dehydration and Williamson Ether Synthesis
10.0K
Overview
Ethers can be prepared from organic compounds by various methods. Some of them are discussed below,
Preparation of Ethers by Alcohol Dehydration
In this method, in the presence of protic acids, alcohol dehydrates to produce alkenes and ethers under different conditions. For example, in the presence of sulphuric acid, dehydration of ethanol at 413 K yields ethoxyethane, whereas it yields ethene at 443 K.
Ethers can be prepared from organic compounds by various methods. Some of them are discussed below,
Preparation of Ethers by Alcohol Dehydration
In this method, in the presence of protic acids, alcohol dehydrates to produce alkenes and ethers under different conditions. For example, in the presence of sulphuric acid, dehydration of ethanol at 413 K yields ethoxyethane, whereas it yields ethene at 443 K.
10.0K
02:35Acid-Catalyzed Dehydration of Alcohols to Alkenes
18.9K
In a dehydration reaction, a hydroxyl group in an alcohol is eliminated along with the hydrogen from an adjacent carbon. Here, the products are an alkene and a molecule of water. Dehydration of alcohols is generally achieved by heating in the presence of an acid catalyst. While the dehydration of primary alcohols requires high temperatures and acid concentrations, secondary and tertiary alcohols can lose a water molecule under relatively mild conditions.
18.9K
01:20Aldehydes and Ketones with Water: Hydrate Formation
3.0K
An oxygen-based nucleophile, like water, can undergo addition reactions with aldehydes and ketones. The reaction leads to the formation of hydrates, also referred to as 1,1-diols or geminal diols.
The formation of hydrates is a reversible reaction. Hydrate formation is influenced by steric and electronic factors accompanying the alkyl substituents on the carbonyl group: The rate of hydrate formation increases with a decrease in the number of alkyl groups attached to the carbonyl carbon. Hence,...
The formation of hydrates is a reversible reaction. Hydrate formation is influenced by steric and electronic factors accompanying the alkyl substituents on the carbonyl group: The rate of hydrate formation increases with a decrease in the number of alkyl groups attached to the carbonyl carbon. Hence,...
3.0K
02:15Preparation of Alcohols via Addition Reactions
6.1K
Overview
The acid-catalyzed addition of water to the double bond of alkenes is a large-scale industrial method used to synthesize low-molecular-weight alcohols. An acidic atmosphere is required to allow the hydrogen in the water molecule to act as an electrophile and attack the double bond in an alkene. The addition of a proton to the double bond creates a carbocation intermediate. The proton preferentially bonds to the less substituted end of the double bond to create a more stable carbocation...
The acid-catalyzed addition of water to the double bond of alkenes is a large-scale industrial method used to synthesize low-molecular-weight alcohols. An acidic atmosphere is required to allow the hydrogen in the water molecule to act as an electrophile and attack the double bond in an alkene. The addition of a proton to the double bond creates a carbocation intermediate. The proton preferentially bonds to the less substituted end of the double bond to create a more stable carbocation...
6.1K
00:43Dehydration of Aldols to Enones: Acid-Catalyzed Aldol Condensation
2.1K
As shown in Figure 1, under acidic conditions, the β-hydroxy ketone undergoes dehydration via an E1 elimination reaction to form an enone.
2.1K
01:14Dehydration of Aldols to Enals: Base-Catalyzed Aldol Condensation
5.2K
This lesson delves into the aldol condensation catalyzed by bases, where aldols undergo dehydration to enals. As shown in Figure 1, the β-hydroxy aldehyde formed in a base-catalyzed aldol addition reaction dehydrates on heating to yield an unsaturated carbonyl product, which is commonly referred to as an enal.
5.2K