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对液相法甲醇合成系统进行了热力学分析,建立了求解该系统相平衡和化学平衡问题的非线性方程组。在此基础上,分别对以四甘醇二甲醚和角鲨烷为液相介质的反应热力学平衡进行了计算,结果表明液相介质具有提高甲醇平衡收率的作用。研究了液相介质的性能、用量、温度、压力及原料气组成对甲醇平衡收率的影响。 相似文献
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Approximate analytical expressions of overall effectiveness factors for parallel catalytic reac-tions occurring in a spherical catalyst pellet with both internal and external mass transfer resistancesare obtained after taking the information given by asymptotic solutions valid for small and largevalues of Thiele moduli.This approximate procedure is feasible for power law as well asLangmuir-Hinshelwood kinetics and the agreement between the approximation and the numerical re-sults is good enough for practical purposes.Moreover,the method does not require any iterative ortrial-and-error computation,and can be conveniently applied in most practical calculations for reac-tors giving reliable results. 相似文献
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尹秋响 《中国化学工程学报》1998,6(2):138-148
The possibility of both concentration and temperature multiplicities has bcen studied for the case of acontinuous adiabatic mixed suspension mixed product removal(MSMPR)reactive precipitaior.A Process in-volving homogeneous chemical reaction in first order reaction kinetics with respect to each of the reactive compo-nents and subsequent crystallization described by conventional power law growth and power law magma depen-dent nucleation models is considered.The temperature dependency of each of these kinetics is described by Ar-rhenius relations.Parameter regions are determined in which multiple steady states exist.The linear stability ofthese steady states is analyzed by using the Routh criterion approach. 相似文献
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通过向纯铝中加入不同量的稀土元素Yb,制备了一系列Al-Yb合金。通过极化曲线、交流阻抗、恒电流放电等电化学测试,研究了合金在4 mol/L KOH碱性电解液中的电化学活性以及利用率。结果表明,Yb的加入能够提高铝放电时的电流密度,提升效率为50%,并且能够增加20%的利用率,显著提高铝-空气电池阳极的性能。不同的Yb质量分数对铝合金有不同的影响,通过一系列实验以及理论分析找出最佳质量分数为0. 8%。 相似文献
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溶解度的测定与预测对于多晶型体的晶体生长和结晶过程中的多晶型控制至关重要.利用激光监视装置,首次测得了半水盐酸帕罗西汀在不同溶剂体系中的溶解度,共计308组数据;采用多参数人工神经网络模型,随机选取308组数据中的184组数据进行人工神经网络的训练,考察了不同隐含层节点数对神经网络训练效果的影响,得到了优化后的人工神经网络模型,利用剩余的124组数据对优化后的模型进行检测,平均预测误差小于0.7%.预测结果表明,优化后的人工神经网络模型可以胜任半水盐酸帕罗西汀溶解度预测的任务. 相似文献