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公开(公告)号：US11504701B2
公开(公告)日：2022-11-22
申请号：US17100938
申请日：2020-11-22
发明人： Javier Guzman Pantoja , Edith Meneses Ruiz , Candido Aguilar Barrera , Andrea Rodriguez Hernandez , Isidoro Garcia Cruz , Jose Antonio Munoz Arroyo , Juan Carlos Gaytan Ramos
摘要： This invention is related to the synthesis of organic carbonates from carbon dioxide and epoxides. It is particularly focused on the production of propylene cyclic carbonate from propylene oxide. The proposed catalytic materials includes a support made of aluminum oxyhydroxide (Catapal B®), nitric acid, acetic acid and/or phosphoric acid. An important stage is the physical and chemical conditioning of the catalytic materials and to this end, experimental methodologies such as spheronization and thermal treatments were implemented prior the evaluation process.
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公开(公告)号：US09675941B2
公开(公告)日：2017-06-13
申请号：US14699462
申请日：2015-04-29
CPC分类号： B01D71/64 , B01D53/228 , B01D67/0009 , B01D69/06 , B01D2256/10 , B01D2256/12 , B01D2256/16 , B01D2256/18 , B01D2256/24 , B01D2256/245 , B01D2257/102 , B01D2257/502 , B01D2257/504 , B01D2325/20 , B01D2325/34 , C08G73/1039 , C08G73/1053 , C08G73/1064 , C08G73/1067 , C08G73/1071 , C08J5/18 , C08J2379/08 , Y02C10/10 , Y02P20/152
摘要： The present invention relates to the synthesis of linear aromatic polyimides and the production of membranes for the separation of gases. Specifically, polyimides featuring in their chemical structure, in the part derived from a diamine, 4-fluoro-4′,4″-diaminotriphenylmethane, and an aromatic dianhydride derived from tetracarboxylic acid. Polyimides are soluble in amidic solvents such as N,N′-dimethylformamide, N,N′-dimethylacetamide, N-methyl-2-pyrrolidone, etc., which are processed as dense membranes by controlled evaporation of the solvent. The resulting membranes are capable of separating at least a gaseous mixture constituted by two components such as H2/CH4, He/N2, H2/CO2, O2/N2, CO2/CH4 and CO2/N2.
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