常、高温对类菱沸石分子筛吸附性能的研究
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摘要
乙醇水溶液恒沸体系的常规精馏不但能耗高、而且除不尽。通过A、B、C分子筛(自制)与商业化的分子筛吸附性能对比研究发现:所有分子筛的吸附量随着吸附时间的延长而增大,在9 h达到最大值。B分子筛最大吸附量为1. 5737 g/g,A分子筛的最大吸附量为0. 8181 g/g,都大于已商业化Na A分子筛的最大吸附量(0. 7811 g/g)。并考察自制分子筛在120℃恒温箱中24 h之后的吸附性能,A分子筛最大吸附量增加,B分子筛最大吸附量减少,C分子筛最大吸附量基本一致。
The conventional rectification of the constant boiling system of the aqueous ethanol solution is not only energy-intensive but also inexhaustible. Through the comparison of adsorption performance of molecular sieves( self-made) with A,B,C and commercial molecular sieves,it was found that the adsorption amount of all molecular sieves increased with the increase of adsorption time and reached the maximum at 9 h. The maximum adsorption capacity of B molecular sieve was 1. 5737 g/g,and the maximum adsorption capacity of a molecular sieve was 0. 8181 g/g,which was greater than the maximum adsorption capacity of commercial NaA molecular sieve( 0. 7811 g/g). The adsorption performance of self-made molecular sieves in an incubator at 120 ℃ for 24 h was investigated. The maximum adsorption capacity of A molecular sieves increased,the maximum adsorption capacity of B molecular sieves decreased,and the maximum adsorption capacity of C molecular sieves was basically the same.
The conventional rectification of the constant boiling system of the aqueous ethanol solution is not only energy-intensive but also inexhaustible. Through the comparison of adsorption performance of molecular sieves( self-made) with A,B,C and commercial molecular sieves,it was found that the adsorption amount of all molecular sieves increased with the increase of adsorption time and reached the maximum at 9 h. The maximum adsorption capacity of B molecular sieve was 1. 5737 g/g,and the maximum adsorption capacity of a molecular sieve was 0. 8181 g/g,which was greater than the maximum adsorption capacity of commercial NaA molecular sieve( 0. 7811 g/g). The adsorption performance of self-made molecular sieves in an incubator at 120 ℃ for 24 h was investigated. The maximum adsorption capacity of A molecular sieves increased,the maximum adsorption capacity of B molecular sieves decreased,and the maximum adsorption capacity of C molecular sieves was basically the same.
引文
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[5] Jacobs P A,Martens J A. Synthesis of High-Silica Aluminosilicate Zeolites[J]. Stud. Surf. Sci. Catal. 33,Amsterdam,Oxford,New York,Tokyo:Elsevier,1987:105-107.
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[2] Davis M E,Lobo R F. Zeolite and Molecular Sieve Synthesis[J].Chem. Mater.,1992,4(4):756-768.
[3] BEIN T. Synthesis and Applications of Molecular Sieve Layers and Membranes[J]. Chemistry of Materials,1996,8(8):1636-1653.
[4] BU X,FENG P,STUCKY G D. Large-Cage Zeolite Structures with Multidimensional 12-Ring Channels[J]. Science,1997,278(5346):2080-2085.
[5] Jacobs P A,Martens J A. Synthesis of High-Silica Aluminosilicate Zeolites[J]. Stud. Surf. Sci. Catal. 33,Amsterdam,Oxford,New York,Tokyo:Elsevier,1987:105-107.
[6] Dyer A. An Introduction to Zeolite Molecular Sieves[J]. Chichester:John Wiley and Sons,1988:56-58.