检索结果-南通市图书馆

A sensitivity analysis and multi-objective optimization to enhance ethylene production by oxidative dehydrogenation of ethane in a membrane-assisted reactor

引用

Chinese Journal of Chemical Engineering 2018年第9期26卷 1879-1895页

作者： ali darvishi ali Bakhtyari Mohammad Reza Rahimpour Department of Chemical Engineering Shiraz University

Owing to the importance of process intensification in the natural gas associated processes, the present contribution aims to investigate the production of an important natural gas downstream product in an improved ***, a membrane-assisted reactor for the oxidative dehydrogenation of ethane is presented. The presented system includes a membrane for axial oxygen dosing into the reaction side. Such a strategy would lead to optimum oxygen distribution along the reactor length and prevention of hot spot formation as well. A feasibility study is conducted by developing a validated mathematical model composed of mass and energy balance equations. The effects of various operating variables are investigated by a rigorous sensitivity ***, by applying the genetic algorithm, a multi-objective optimization procedure is implemented to obtain the optimum operating condition. Considerable increase in the ethane conversion and ethylene yield are the advancements of membrane-assisted oxidative dehydrogenation reactor working under the optimum *** than 30% increase in the ethane conversion is obtained. Furthermore, the ethylene yield is enhanced up to 0.45.

关键词： Olefin ODH process Genetic algorithm Fixed-bed Mathematical modeling Chemical reactors

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Modeling-based optimization of a fixed-bed industrial reactor for oxidative dehydrogenation of propane

引用

Chinese Journal of Chemical Engineering 2016年第5期24卷 612-622页

作者： ali darvishi Razieh Davand Farhad Khorasheh Moslem Fattahi Department of Chemical and Petroleum Engineering Shiraz UniversityShirazIran Department of Chemical and Petroleum Engineering Sharif University of TechnologyAzadi AvenueTehranIran Department of Chemical Engineering Abadan Faculty of Petroleum Engineering Petroleum University of TechnologyAbadanIran

An industrial scale propylene production via oxidative dehydrogenation of propane （ODHP） in multi-tubular re- actors was modeled. Multi-tubular fixed-bed reactor used for ODHP process, employing 10000 of small diameter tubes immersed in a shell through a proper coolant flows. Herein, a theory-based pseudo-homogeneous model to describe the operation of a fixed bed reactor for the ODHP to correspondence olefln over V2O5/γ-Al203 catalyst was presented. Steady state one dimensional model has been developed to identify the operation parameters and to describe the propane and oxygen conversions, gas process and coolant temperatures, as well as other pa- rameters affecting the reactor performance such as pressure. Furthermore, the applied model showed that a double-bed multitubular reactor with intermediate air injection scheme was superior to a single-bed design due to the increasing of propylene selectivity while operating under lower oxygen partial pressures resulting in propane conversion of about 37.3%. The optimized length of the reactor needed to reach 100% conversion of the oxygen was theoretically determined. For the single-bed reactor the optimized length of 11.96 m including 0.5 m of inert section at the entrance region and for the double-bed reactor design the optimized lengths of 5.72 m for the first and 7.32 m for the second reactor were calculated. Ultimately, the use of a distributed oxygen feed with limited number of injection points indicated a significant improvement on the reactor performance in terms of propane conversion and propylene selectivity. Besides, this concept could overcome the reactor run- away temperature problem and enabled operations at the wider range of conditions to obtain enhanced propyl- ene production in an industrial scale reactor.

关键词： Fixed-bed reactor Mathematical modeling Oxidative dehydrogenation of propane Propylene V2O5/γ-Al203 catalyst Optimization

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

铁兰的结构及其作为重金属生物监测器在空气污染评估研究中的应用(英文)

引用

黑龙江大学自然科学学报 2014年第5期31卷 623-632,701页

作者： SHEIKHNEJAD-BISHE Ommeaymen 赵峰 RAJABTABAR-darvishi ali MOSTOFIZADEH ali 黄玉东哈尔滨工业大学化工学院哈尔滨150001

铁兰是一种不从土壤汲取养分的气生植物,在很多国家被用于空气污染的监测研究。虽然铁兰作为生物监测被广泛报道,但却很少有关于铁兰自身结构与其作为生物监测器间相关性的研究。由于它们从降水中吸收水分、养料以及大气污染物,因此,通... 详细信息

铁兰是一种不从土壤汲取养分的气生植物,在很多国家被用于空气污染的监测研究。虽然铁兰作为生物监测被广泛报道,但却很少有关于铁兰自身结构与其作为生物监测器间相关性的研究。由于它们从降水中吸收水分、养料以及大气污染物,因此,通过检测其组织中累积的重金属即可判断空气的主要污染源。为了进行环境监测,常需要依据土地使用类型、人类活动范围以及距离重金属源的距离进行分类采样,并且要区分农业、城镇、工业及交通区域,铁兰因其广泛的生长适应性、低廉的成本、可长期在不同区域生长并易于采样,被许多研究者认为是环境污染监测中重金属富集的理想植物。

关键词：铁兰生物监测空气污染气生植物毛状体茎

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Therapeutic potential of flavonoids in inflammatory bowel disease: A comprehensive review

引用

World Journal of Gastroenterology 2017年第28期23卷 5097-5114页

作者： ali Salaritabar Behrad darvishi Farzaneh Hadjiakhoondi Azadeh Manayi Antoni Sureda Seyed Fazel Nabavi Leo R Fitzpatrick Seyed Mohammad Nabavi Anupam Bishayee Department of Integrative oncology Breast Cancer Research CenterMotamed Cancer InstituteACECR Department of Recombinant Protein Breast Cancer Research CenterMotamed Cancer InstituteACECR Medicinal Plants Research Center Faculty of PharmacyTehran University of Medical Sciences Research Group on Community Nutrition and oxidative Stress and CIBERo BN-Physiopathology of obesity and Nutrition University of Balearic IslandsPalma de Mallorca Applied Biotechnology Research Center Baqiyatallah University of Medical Sciences Department of Pharmaceutical and Biomedical Sciences California Northstate University College of Pharmacy Department of Pharmaceutical Sciences College of PharmacyLarkin University

The inflammatory process plays a central role in the development and progression of numerous pathological situations,such as inflammatory bowel disease(IBD),autoimmune and neurodegenerative diseases,metabolic syndrome,and cardiovascular disorders. IBDs involve inflammation of the gastrointestinal area and mainly comprise Crohn's disease(CD) and ulcerative colitis(UC). Both pathological situations usually involve recurring or bloody diarrhea,pain,fatigue and weight loss. There is at present no pharmacological cure for CD or UC. However,surgery may be curative for UC patients. The prescribed treatment aims to ameliorate the symptoms and prevent and/or delay new painful episodes. Flavonoid compounds are a large family of hydroxylated polyphenolic molecules abundant in plants,including vegetables and fruits which are the major dietary sources of these compounds for humans,together with wine and tea. Flavonoids are becoming very popular because they have many health-promoting and disease-preventive effects. Most interest has been directed towards the antioxidant activity of flavonoids,evidencing a remarkable free-radical scavenging capacity. However,accumulating evidence suggests that flavonoids have many other biological properties,including anti-inflammatory,antiviral,anticancer,and neuroprotective activities through different mechanisms of action. The present review analyzes the available data about the different types of flavonoids and their potential effectiveness as adjuvant therapy of IBDs.

关键词： Antioxidant Inflammation Gastrointestinal tract Flavonoids Polyphenols

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：