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气相一步法制异戊二烯催化剂的研究进展 被引量:2
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作者 许珊 朱海林 +2 位作者 张日翔 王清雪 雒旭 《石油化工》 CAS CSCD 北大核心 2020年第2期177-183,共7页
异戊二烯是一种重要的化工原料,在橡胶、医学农药和精细化工等领域有着重要的应用,目前合成异戊二烯的方法中,以异丁烯为原料的Prins气相缩合法由于具有过程简单、安全无污染、产物异戊二烯纯度高等优点,被国内外认为是非常有前景的合... 异戊二烯是一种重要的化工原料,在橡胶、医学农药和精细化工等领域有着重要的应用,目前合成异戊二烯的方法中,以异丁烯为原料的Prins气相缩合法由于具有过程简单、安全无污染、产物异戊二烯纯度高等优点,被国内外认为是非常有前景的合成方法。全面介绍了用于烯醛气相一步法制备异戊二烯催化剂的种类,系统分析了不同催化剂的催化机理,探讨了烯醛一步法制备异戊二烯催化剂的发展趋势和应用前景。 展开更多
关键词 异戊二烯 Prins气相缩合 固体酸催化剂 机理
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High Order Numerical Code for Hyperbolic Mild-slope Equations with Nonlinear Dispersion Relation
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作者 IU Zhongbo zhang rixiang CHEN Bing 《Journal of Ocean University of China》 SCIE CAS 2007年第4期421-423,共3页
Based on the hyperbolic mild-slope equations derived by Copeland (1985), a numerical model is established in unstag- gered grids. A composite 4 th-order Adam-Bashforth-Moulton (ABM) scheme is used to solve the model i... Based on the hyperbolic mild-slope equations derived by Copeland (1985), a numerical model is established in unstag- gered grids. A composite 4 th-order Adam-Bashforth-Moulton (ABM) scheme is used to solve the model in the time domain. Terms involving the first order spatial derivatives are differenced to O ( Δx )4accuracy utilizing a five-point formula. The nonlinear dispersion relationship proposed by Kirby and Dalrymple (1986) is used to consider the nonlinear effect. A numerical test is performed upon wave propagating over a typical shoal. The agreement between the numerical and the experimental results validates the present model. Biodistribution and applications are also summarized. 展开更多
关键词 hyperbolic mild-slope equations Adams-Bashforth-Moulton scheme nonlinear dispersion property WAVE
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