A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 54623-25-5, Name is 2,3,5-Tri-O-benzyl-D-ribose, molecular formula is C26H28O5. In an article, author is Tang, John,once mentioned of 54623-25-5, Safety of 2,3,5-Tri-O-benzyl-D-ribose.
Perfluoropolymer membrane behaves like a zeolite membrane in dehydration of aprotic solvents
Dehydration of aprotic solvents, frequently needed in pharmaceutical processing, can be implemented easily by vacuum-based pervaporation employing a novel perfluoropolymer-based membrane: perfluoro-2,2-dimethyl-1,1,3-dioxole copolymerized with tetrafluoroethylene (PDD-TFE). Possessing one of the highest fractional free volumes, this polymer is resistant to most solvents including N,N-dimethyl formamide (DMF), N,N-dimethylsulfoxide (DMSO), and N,N-dimethylacetamide (DMAc). Results were obtained using a 25 mu m thick dense polymeric membrane supported by a porous polytetrafluoroethylene (PTFE) sheet. Maximum water flux values found for a 90 wt% aprotic solvent feed were as follows: 77 g/(m(2) h) for DMF-water mixture at 50 degrees C; 9.8 g/(m(2) h) for DMSO-water mixture at 30 degrees C; 9 g/(m(2) h) for DMAc-water mixture at 50 degrees C. Excellent pervaporation separation factors for water over these aprotic solvents were obtained for mixtures containing 1, 5 and 10 wt% water in the temperature range 30-60 degrees C. The separation factors varied between 1000 and 12,000 depending on the water content, temperature and the solvent species. Such highly selective water removal in pervaporation has been achieved earlier in dehydration of ethanol by NaA zeolite membranes which however achieve an order of magnitude lower selectivity in for example, DMF-water system. (C) 2012 Elsevier B.V. All rights reserved.
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Reference:
1,3-Benzodioxole – Wikipedia,
,Dioxole | C3H4O2 – PubChem