搜索结果: 46-60 共查到“知识库 化学工程”相关记录10466条 . 查询时间(2.942 秒)
在膜蒸馏-结晶过程的基础上,根据膜选择性脱除溶剂、膜孔区域成核导致通量骤减的原理,开发了一种以微孔膜界面响应结晶成核的新方法,精确测定高浓度、低透光溶液的结晶介稳区宽度.采用微孔膜界面响应法分别探究了氯化钠、硝酸钾和氯化铜几种二元水溶液体系的成核生长过程,并完成介稳区宽度测定.结果表明,微孔膜界面响应法的通量衰减转折点总是早于激光法的光强信号转折点,随温度的升高,跨膜通量升高,介稳区宽度增大;对于...
利用真空膜蒸馏-结晶耦合技术处理多元高盐废水(Na+、Mg2+//Cl--H2O),回收纯水和高品质NaCl晶体产品,考察不同操作温度和不同无机盐离子浓度对膜蒸馏性能和NaCl晶体产品性质调控作用.结果表明随着温度升高导致饱和蒸气压增大,增大了跨膜压差,膜的渗透通量逐渐升高;随着溶液中Mg2+浓度的逐渐升高,膜的渗透通量呈下降的趋势,主要是由于水的质量分数下降和溶液黏度增加;膜蒸馏过程中,通过对比...
氨法烟气脱硫塔外氧化技术的模拟与优化
氨法脱硫 塔外氧化 氨逃逸 Aspen plus 硫酸铵
2023/6/21
氨法脱硫塔外氧化技术是在传统的塔内直通空气氧化技术的基础上加以改进得到的一种新型技术.该技术将氧化环节移至塔外氧化器, 使得塔内气量减小, 出口烟气中氨逃逸量及气溶胶含量明显降低, 且结晶颗粒外观得到改善.使用Aspen plus软件对氨法脱硫塔外氧化技术全流程进行了严格的稳态模拟, 并对喷淋层分流比, 吸收液pH, 烟气温度, 浓缩段液气比等进行了重新优化设计.塔外氧化工艺最佳操作条件为:喷淋层...
考虑本质安全的换热网络多目标优化
换热网络 stage-wise 本质安全 多目标优化 Pareto前沿
2023/6/21
由于国内外重大化工事故的频发及化工行业节能降耗的需求日益迫切,研究本质更安全的换热网络多目标优化具有重要意义.采用评价指数的方法,对换热网络的本质安全易爆性、毒性、存量进行量化表征.采用数学规划法分别建立换热网络经济与本质安全易爆性、毒性、存量同步优化数学模型.采用归一化法构建经济和安全的目标函数.通过算例研究发现,考虑易爆性,倾向于不易爆流股间换热,减少易爆流股换热次数;考虑毒性,倾向于减少有毒...
为改善电催化活性和亲水性,作者对商业碳黑(BP2000)进行了酸处理,获得了酸处理碳(ATC).通过X光电子能谱、红外光谱、热重和接触角测试的表征方法证明了酸处理在碳表面产生了丰富的含氧基团.本文首次利用紫外可见光谱测试了碱性条件抗坏血酸(AA)在空气中的化学氧化活化能,结果为37.1 kJ·mol~(-1).另外,利用交流阻抗谱对碱性条件下ATC作为电催化剂时AA的氧化反应的活化能进行了评价.碱...
Chemiluminescence Sensor Based on Composite Functional Nucleic Acid for Detection of Ochratoxin A in Wine
Functional nucleic acid Aptamer Split DNAzyme Chemiluminescence Ochratoxin A
2023/6/21
Chemiluminescence Sensor Based on Composite Functional Nucleic Acid for Detection of Ochratoxin A in Wine
Revealing the effect of aluminum content on the electrochemical performance of magnesium anodes for aqueous batteries
aluminum content discharge potential Mg-Al alloy anodes utilization efficiency
2023/6/21
Al is one of the principal alloying elements for Mg anodes. In this study, a series of Mg-Al alloys has been evaluated as anode materials for optimizing the Al addition amount in Mg anodes with the in...
Uniform Pd0.33Ir0.67 nanoparticles supported on nitrogen-doped carbon with remarkable activity toward the alkaline hydrogen oxidation reaction
Alkalinity Anodes Binary alloys Carbon Cyclic voltammetry Density functional theory
2023/6/21
Highly efficient non-Pt electrocatalysts for the alkaline hydrogen oxidation reaction (HOR) are required to enable complete replacement of Pt in hydroxide exchange membrane fuel cells (HEMFCs). Herein...
以七水合硫酸锌(ZnSO4?7H2O)和六亚甲基四胺(HMT)为原料,采用化学浴沉积法合成了碱式硫酸锌(ZSH)微米片,并将其作为填料嵌入氟碳(FC)清漆中.采用傅里叶变换红外光谱仪、场发射扫描电镜、能谱仪和X射线衍射仪分析了ZSH微米片的健结构、形貌和组分.对比了不同ZSH的质量分数时在紫铜上所得FC–ZSH复合涂层的剖面结构、ZSH分布情况及腐蚀防护性能.结果表明,所得ZSH呈典型的六方片状晶...
Controlled Preparation of MgAl-Layered Double Hydroxide/Graphene Hybrids and Their Applications for Metal Protection
MgAl-Layered Double Hydroxide Graphene Hybrids
2023/6/21
The ion-conductive nature of layered double hydroxides (LDHs) and poor dispersibility of graphene are considered to be vital problems that limit their applications in the field of metal protection. Th...
The role of graphene loading on the corrosion-promotion activity of graphene/epoxy nanocomposite coatings
Graphene Polymer-matrix composites Coatings Corrosion
2023/6/21
It is still arguable whether graphene/polymer nanocomposite coating is corrosion inhibitors or promoters. This work aims to determine the "percolation threshold" for corrosion-promotion activity of th...
Partially dehydrated zinc hydroxide sulfate nanoplates reinforced coating for corrosion protection
Zinc hydroxide sulfate Dehydration Crystal phase transition Active barrier Synergistic effect
2023/6/21
In this work, partially dehydrated zinc hydroxide sulfate nanoplates are synthesized by facile chemical bath deposition together with subsequent heat dehydration. The nanoplates exhibit well-defined h...
Heat exchanger network synthesis integrated with flexibility and controllability
Heat exchanger networks Flexibility Controllability Coupling Synthesis
2023/6/19
Over the last three decades, flexibility and controllability considerations for heat exchanger networks (HENs) have received great attention, respectively. However, they should be simultaneously incor...
Computer-Aided Polymer Design: Integrating Group Contribution and Molecular Dynamics
Polymer Design Integrating Group Contribution Molecular Dynamics
2023/6/19
Polymers are widely used to manufacture many chemical products. Often, polymers are designed by trial-and-error, which is expensive and time-consuming. In this work, a new optimization-based computer-...
Economic evaluation and environmental assessment of shale gas dehydration process
Shale gas Dehydration Optimization Hybrid LCI model Input-output model
2023/6/19
Triethylene glycol (TEG) is widely applied to the removal of water in shale gas. This study presents a framework of economic evaluation and environmental assessment for two TEG-based dehydration appro...