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本文介绍一个微量合成综合化学实验—N-丁基-4-溴-1,8-萘酰亚胺合成及质谱表征。该实验通过亲核取代和缩合反应合成N-丁基-4-溴-1,8-萘酰亚胺,并利用质谱进行表征,拓展了化学类专业实验的知识面,有利于提高学生综合应用与创新能力。 相似文献
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An effective new method solves either the stretched functional ordinary differential equation describing a crystallization process using breakage models, or the partial differential equations for a population balance which represent the transient crystallization process. The population balance density function is first expanded into a series of shifted Legendre polynomial functions. The partial differential equation (or the ordinary differential equation) is first transformed into a series of ordinary differential equations (or of algebraic equations) for the expansion coefficients which are solved by numerical computation. The computational time is greatly reduced through a recursive algorithm for the integration of the triple product of the shifted Legendre polynomial functions. Illustrative examples are given and the results are compared with data available in the literature. The proposed method is powerful, accurate and more precise than previously documented ones. 相似文献
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分析了常规高酸原油脱酸工艺的不足,介绍了近几年国内外对高酸原油脱酸的新工艺方法,如离子液体原油脱酸、脱酸剂技术脱酸、高温热解脱酸等方法。新技术将对原油脱酸技术的发展起到一定的推动作用,其中咪唑型阳离子脱酸具有较大的应用前景。 相似文献
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新型吸水树脂用于低级醇脱水的研究 总被引:1,自引:0,他引:1
与水共沸的物质的精制相当困难,一般工艺流程都较长。采用新型吸水树脂对低级醇进行脱水实验。实验发现C3—C5的一元醇精制时采用吸水树脂脱水效果极佳。优点是流程短,设备简单,损失少,且树脂可以重复使用,为工业化生产提供了依据。 相似文献
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Hengjun Gai Kaiqiang Lin Yirong Feng Meng Xiao Kai Guo Hongbing Song 《中国化学工程学报》2018,26(10):2040-2047
In many chemical processes, large amounts of wastewater containing butanol and isobutanol are produced. Given that n-butanol-isobutanol-water can form triple azeotrope, high-purity butanol cannot be recovered from the wastewater by ordinary distillation. To economically and effectively recover butanol from this kind of wastewater, 1,4-butanediol is selected as an extractant to break the formation of the azeotropes, and a doubleeffect extractive distillation process is proposed. The conceptual design of the proposed process is accomplished based on process simulation. With the proposed process, the purity of recovered butanol and water is greater than 99.99 wt%. In comparison with the conventional azeotropic distillation process, economic analysis shows that the operating cost of the proposed process is lower:when the capacity of wastewater treatment is 100 t·h-1, the total operating cost decreases by 5.385×106 USD per year, and the total annual cost of the new process decreases by 5.249×106 USD per year. In addition, in the extractive distillation system, variable effects on separation purities and cost are more complex than those in the ordinary distillation system. The method and steps to optimize the key variables of the extractive distillation system are also discussed in this paper and can provide reference for similar studies. 相似文献
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Stephen J. Lombardo David G. Retzloff 《Journal of the American Ceramic Society》2019,102(3):1030-1040
Minimum time heating cycles have been simulated for binder removal from ceramic green bodies where the product of binder decomposition exits the green body via diffusion. The model consists of the reaction-diffusion partial differential equation, ordinary differential equations describing the reaction kinetics and a heating function, and algebraic equations, one of which imposes a constraint on concentration or pressure to avoid failure of the green body. Two solution approaches were compared: an earlier approximate method based on the pseudo-steady state assumption combined with a variational calculus algorithm and a new approach based on the finite element method combined with a process control algorithm. The agreement between the two solution strategies reinforces the validity of the pseudo-steady state approximation and the utility of the process control methodology. The latter, which was also applied to problems in which no approximate solution was obtainable, is thus a general method for obtaining minimum time heating cycles. 相似文献
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对德士古气化炉炉膛温度提出了一种基于主元分析方法与新型径向基函数(RBF)网络相结合的推断估计策略.首先利用工艺先验知识和主元分析方法对网络高维输入向量进行了降维化简和辅助变量的选择.然后提出了一种RBF网络的新型混合递推算法,包括修正网络中心的自适应聚类的简化型次胜者受罚竞争学习(SRPCL)算法,和修正网络权值的带遗忘因子的递推最小二乘算法.结果表明,该推断估计器具有良好的跟踪速率和较高的估计精度,其性能显著优于基于传统RBF网络算法和普通反向传播(BP)算法的推断估计器的性能. 相似文献