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三相淤浆床甲醇合成反应器大型冷模研究 总被引:4,自引:0,他引:4
以空气-水-催化剂和空气-液体石蜡油-催化剂两种系统为对象,研究了内置垂直管束式换热器三相淤浆床甲醇合成反应器的流体力学性质--平均气含率、床层压降、固体完全悬浮的临界表观气速。考察了各种因素对流体力学性质的影响。并得到关于气含率的经验关联式:εG/(1-εα)^4=0.005744〔uGμL/σ〕^0.10〔1+cs/〔1-cs/ps〕σL+cs〕^-1.73。 相似文献
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目前,铈的测定方法报道较多[1,2],但其化学发光分析法却未见文献报道。在适宜条件下,铈对鲁米诺-过氧化氢-铬(Ⅲ)体系存在熄灭效应,熄灭程度与浓度呈良好的线性关系,以此建立了铈的流动注射化学发光分析法。该法线性范围为1.0×10-6~1.0×10-4mol/L,相关系数大于0.9980,检出限为3×10-7mol/L铈,用于合成样品分析,结果满意。1 实验部分1.1 试剂1.0×10-4g/mL铬(Ⅲ)标准溶液:用Cr-Cl3·6H2O(A.R.)配制;5×10-4mol/L鲁米诺溶液:称取8… 相似文献
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在为微生物高密度培养而设计的10L多段内导流筒气升式生物反应器中,研究了Na2SO3-空气体系单孔喷嘴和烧结金属管等不同气体分布器对气含率ε、体积氧传质系数KLa和流动特性的影响.结果表明,孔径为20~25μm的烧结金属管的整体性能最好,在最佳操作气速3.7~4.0cm/s下,ε超过19%,KLa可达0.29s-1.其ε和KLa随Ug有如变化规律:ε=0.1952-1.53510-2e-1.391UgKLa=0.27+2.9710-2Ug-7.2310-3U2g(1.5<Ug<6cm/s 相似文献
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研究了Mo(Ⅵ)与Tiron的反应,发现在pH4.0的HAc-NaAc介质中形成1:1配合物,该配合物在252nm、315nm有两个吸收峰,而在可见光区无吸收峰。测得ε252=6.9×10 ̄3L·mol-1·Cm-1,ε315=3.5×103L·mol-1·Cm-1。据此建立了测定Mo(Ⅵ)的方法,在252nm和315nm处的线性范围分别为1.6×10-6mol·L-1~2.O×10-4mol·L-1和3.2×10-4mol·L-1~2.0×10-4mol·L-1。检出限分别为8.O×10-7mol·L-1和1.6×10-6mol·L-1.PO_4 ̄3+、SiO_3 ̄2-对测定无干扰,而W(Ⅵ)、V(Ⅴ)、Fe(Ⅲ)等有干扰。该法试用于有机磷合钼聚多酸盐样品的测定,结果满意,方法回收率96%~102%,变异系数≤1.l%(n=12)。 相似文献
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用GFU-201原子吸收分光光度计对测定橡胶中的铅进行试验研究。测量条件:波长,2833;空气流量4.4L/min;乙炔流量1.3L/min。消除干扰选用0.3%碳酸钙、0.2%Fe2O3和0.15%钾。灵敏度为0.3×10-6,相对误差±2.3%,均方差0.000036%。 相似文献
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采用半连续鼓泡反应器,在氯气通入量为0.084~0.21mol/[L(反应液)·min]、催化剂三氯化铁浓度为5.72×10-4~2.66×10-3mol/L、反应温度为76~120℃的条件下,由实验数据回归出幂函数宏观动力学方程。此方程对于建立反应器数学模型,设计工业反应器以及苯氯化反应精馏技术应用于氯苯生产有一定的参考价值。 相似文献
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内环流反应器多釜串联模型参数与表观气液速度的关联 总被引:1,自引:0,他引:1
用回归方法以文献数据为依据,得到内环流反应器多釜串联模型参数与表观气液速度间的关联式:N=1.484+595.9uL+3.600uG。 相似文献
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对Si-C-O-N系统进行了平衡状态下的相稳定性计算,绘制了在1473K和1573K下的Si3N4、SiC、Si2N2O和SiO2相稳定性与N2分压和O2分压的关系图以及N2分压和SiO分区的关系图,Si3N4/Si2N2O/SiC、SiO2/Si2N2O/SiC两个三固相平衡点与N2分压、O2分压和SiO分压以及温度的函数关系日。并以此确定C纤维-SiC纤维转变和C纤维上涂层SiC过程中,为获得稳定SiC相的气体分压。 相似文献
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本文提出的定量相分析方法,解决了含非晶相试样的定量问题,并讨论了在各种具体情况下的应用。试验证明可将这一方法有效地应用于水泥、灰砂试样的矿相分析,它在玻璃、陶瓷等材料的分机中也有一定意义。 相似文献
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Partitioning of bovine serum albumin (BSA) in an aqueous double countercurrent distribution (DCCD) using a three-phase system was studied and compared with countercurrent distribution using a two-phase system. The two-phase system was composed of Dextran and Polyethylene glycol (PEG) solulions, and the three-phase system consisted of Dextran, Ficoll, and PEG solutions. In the double countercurrent distribution experiment, BSA was partitioned from the stationary bottom phase into the moving middle and top phases. Two peaks resulted from these transfers. A mathematical model that predicts peak positions and shapes based on the partitioning behavior of the solute is provided. Based on model predictions, the DCCD method has potential extraction selectivity and recovery advantages over the traditional CCD method. 相似文献
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Partitioning of bovine serum albumin (BSA) in an aqueous double countercurrent distribution (DCCD) using a three-phase system was studied and compared with countercurrent distribution using a two-phase system. The two-phase system was composed of Dextran and Polyethylene glycol (PEG) solulions, and the three-phase system consisted of Dextran, Ficoll, and PEG solutions. In the double countercurrent distribution experiment, BSA was partitioned from the stationary bottom phase into the moving middle and top phases. Two peaks resulted from these transfers. A mathematical model that predicts peak positions and shapes based on the partitioning behavior of the solute is provided. Based on model predictions, the DCCD method has potential extraction selectivity and recovery advantages over the traditional CCD method. 相似文献
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低收缩相态结构的研究综述 总被引:2,自引:1,他引:1
本文综合介绍了研究低收缩添加剂机理涉及的内容及方法,并介绍了不同种类低收给添加剂的低收缩相态结构及低收缩相态结构对玻璃钢制品性能的影响。 相似文献
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Effects of the continuous phase velocity (0.01-0.08 m/s(, the dispersed phase velocity (0.0-0.04 m/s) and particle size (1.0-3.0 mm) on the individual phase holdups and the mass transfer coefficient have been determined in two (liquid-liquid) and three (liquid-liquid-solid) phase fluidized beds.
In the beds, the dispersed phase holdup increased with dispersed phase velocity but it decreased with continuous phase velocity. Whereas the continuous phase holdup decreased with dispersed phase velocity but it increased with continuous phase velocity. The bed porosity increased with both the dispersed and continuous phase velocities in the beds of 1.7 and 3.0 mm particles. In addition, the continuous phase holdup decreased with the presence of solid particles in the bed, however, the dispersed phase holdup was not affected by the presence of the particles.
The overall mass transfer coefficients in the continuous and dispersed phases increased with increasing fluid velocities but it decreased with the bed height.
The continuous phase holdup and mass transfer coefficient data have been correlated with the operating variables and the dimensionless groups. 相似文献
In the beds, the dispersed phase holdup increased with dispersed phase velocity but it decreased with continuous phase velocity. Whereas the continuous phase holdup decreased with dispersed phase velocity but it increased with continuous phase velocity. The bed porosity increased with both the dispersed and continuous phase velocities in the beds of 1.7 and 3.0 mm particles. In addition, the continuous phase holdup decreased with the presence of solid particles in the bed, however, the dispersed phase holdup was not affected by the presence of the particles.
The overall mass transfer coefficients in the continuous and dispersed phases increased with increasing fluid velocities but it decreased with the bed height.
The continuous phase holdup and mass transfer coefficient data have been correlated with the operating variables and the dimensionless groups. 相似文献
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玻璃分相中的若干问题 总被引:3,自引:1,他引:3
本文着重介绍了玻璃分相研究工作的历史进展和玻璃分相在中国的研究概况。在评论玻璃分相机理的热力学、动力学的基础上,着重提出了作者预测分相区的三种方法。即:(1)数学拟合法;(2)热力学方法;(3)现代连续相变方法。利用这些方法计算了一大批硼酸盐、硅酸盐二元系统的不互溶曲线。 相似文献