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The effect of altering crosslinker chemistry during interfacial polymerization on the performance of nanofiltration membranes for desalination, organic, and micropollutants removal

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Frontiers of Chemical Science and Engineering 2023年第12期17卷 2025-2036页

作者： Jamilu Usman Abdul Waheed Umair Baig Isam HAljundi Interdisciplinary Research Centre for Membranes and Water Security King Fahd University of Petroleum and MineralsDhahran 31261Saudi Arabia Chemical Engineering Department King Fahd University of Petroleum and MineralsDhahran 31261Saudi Arabia

Chemistry of the polyamide active layer of a desalination membrane is critical in determining both its physical and chemical *** this study,we designed and fabricated three novel membranes with different active layers using the crosslinkers:terephthaloyl chloride,isophthaloyl chloride,and trimesoyl *** crosslinkers were reacted with an aqueous solution of an aliphatic *** these crosslinkers differ in their structures and crosslinking mechanisms during interfacial polymerization,the resultant membranes also possess different structural *** water contact angle of the fabricated membranes also varies;the water contact angles of 4A-3P-TPC@PSF/PET,4A-3P-TMC@PSF/PET,and 4A-3P-IPC@PSF/PET,are 68.9°,65.6°,and 53.9°,***,the desalination performance of resultant membranes also showed variations,with 4A-3P-TPC@PSF/PET,4A-3P-IPC@PSF/PET,and 4A-3P-TMC@PSF/PET having a permeate flux of 17.14,25.70,and 30.90 L·m^(−2)·h^(−1),respectively,at 2.5 *** 4A-3P-TPC@PSF/PET membrane exhibited extensive crosslinking with aliphatic linear amine,and cationic dye rhodamine B,MgCl_(2),and amitriptyline rejection rates of 98.6%,92.7%and 80.9%,*** 4A-3P-TMC@PSF/PET membrane showed mediocre performance,while 4A-3P-IPC@PSF/PET membrane showed even lower performance,with a 35%rejection of methyl orange dye.

关键词： acid chlorides covalent crosslinking desalination linear aliphatic amine micropollutant removal thin film composite membranes

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An Efficient Synthesis of Polymethylene-bis-aroyl Thiourea Derivatives under the Condition of Phase Transfer Catalysis

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Chemical Research in Chinese Universities 2001年第Z1期17卷 194-195页

作者： WEI TaiBao Department of Chemistry Northwest Normal University

A number of 1,3-disubstituted derivatives are associated with various types of biological activity [1]. Some thioureas are useful as herbicides, insecticides and plant-growth regulators. Treatment of acylisothiocyanates, prepared from aroyl chlorides (0.0431mol) and potassium thiocyanate (33ml ofa 33% KSCN solution) using tetrabutylammonium bromides as a catalyst, were treated with aniline to yield the corresponding thioureas. However, probable hydrolysis of the aroyl chlorides led to decreased yields. The reaction of acid chlorides with different phenylthioureas or N1-acetyl-N3-arylthioureas requires high temperature and long reaction times. None of the other reported methods proved satisfactory. As a continuation of our earlier work on the biological activity of these compounds, [2-5] we now report acid chlorides are quantitatively converted to the acylisothiocyanates under solid-liquid phase-transfer conditions using PEG-400 as the catalyst. Treatment of these isothiocyanates with polymethylenediamines provides compounds 3 in high yields (scheme 1). The results were summarized in table 1.

关键词： Phase Transfer Catalysis Thiourea Derivatives biological activity acid chlorides high temperature

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Stereoselective Synthesis of (Z)-α,β-Unsaturated Ketones via Hydromagnesiation of Alkynylsilanes

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有机化学 2004年第Z1期24卷 75-页

作者： ZHAO,Hong XIE,Guo-Hao WU,Guo-Ying Department of Chemistry Shangrao Teachers'' College Shangrao 334000 School of Pharmaceutical Sciences Guangdong Pharmaceutical College Guangzhou 510240 Department of Chemistry Shangrao Teachers'' College Shangrao 334000 Department of Chemistry Shangrao Teachers'' College Shangrao 334000

　　α,β-Unsaturated ketones are important synthetic intermediates because of their versatile reactivities and many syn-thetic applications of them have been reported in the literature.[1] However, only a few methods for the synthesis of (Z)-α,β-unsaturated ketones are available. The palladium catalyzed coupling reactions of alkenyl copper reagents with acid chlorides afforded (Z)-α,β-unsaturated ketones.[2] The phase transfer catalyzed hydroacylation of allenes with carbon monoxide, decacarbonyldimanganese and methyl iodide gave (Z)-α,β-unsaturated ketones in a stereospecific process.……

关键词： carbon monoxide phase transfer acid chlorides methods for

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