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Influence of entrainer recycle for batch heteroazeotropic distillation
Laszlo Hegely, Peter Lang
《化学科学与工程前沿(英文)》 2018年 第12卷 第4期 页码 643-659 doi: 10.1007/s11705-018-1760-5
Dehydration of isopropanol applying batch heteroazeotropic distillation with toluene as entrainer (E) is investigated. The composition of the feed is near to that of the isopropanol (A)-water (B) azeotrope. The effects of recycling the entrainer and the off-cut are studied by dynamic simulation with a professional flow-sheet simulator. Three consecutive batches (one production cycle) is studied. Both operational modes (Mode I: decantation after distillation and Mode II: decantation during distillation) are simulated. For Mode II, calculations are performed both for Strategy A (distillate from the aqueous (E-lean) phase only) and Strategy B (partial withdrawal of the organic (E-rich phase), as well). The E-rich phase, the final column hold-up and the off-cut (Mode II only) are recycled to the next batch. The influence of the following parameters are determined: quantity of entrainer, reflux ratios of the steps. The variations caused by the recycling in the 2nd and 3rd batches are also shown. The best results (lowest specific energy demand and highest recovery of A) are obtained by Mode II, Strategy A. Recycling increases the recovery, and drastically diminishes the entrainer consumption. However, it makes the production slower and decreases the quantity of fresh feed that can be processed.
关键词: batch distillation heteroazeotropic distillation operational policies off-cut recycle entrainer
Renewable energy resources, policies and gaps in BRICS countries and the global impact
Lakshmi PATHAK, Kavita SHAH
《能源前沿(英文)》 2019年 第13卷 第3期 页码 506-521 doi: 10.1007/s11708-018-0601-z
Xinqun ZHU, Hong HAO
《结构与土木工程前沿(英文)》 2012年 第6卷 第3期 页码 321-333 doi: 10.1007/s11709-012-0161-y
关键词: integrated structural health monitoring operational conditions vibration and guided wave
Review on environmental policies in China: Evolvement, features, and evaluation
ZHANG Kunmin, WEN Zongguo, PENG Liying
《环境科学与工程前沿(英文)》 2008年 第2卷 第2期 页码 129-141 doi: 10.1007/s11783-008-0044-6
A review of condition-based maintenance: Its prognostic and operational aspects
Yanrong LI, Shizhe PENG, Yanting LI, Wei JIANG
《工程管理前沿(英文)》 2020年 第7卷 第3期 页码 323-334 doi: 10.1007/s42524-020-0121-5
关键词: condition-based maintenance prognostics operational decision-making reliability
An emerging market for groundwater remediation in China: Policies, statistics, and future outlook
Deyi Hou, Guanghe Li, Paul Nathanail
《环境科学与工程前沿(英文)》 2018年 第12卷 第1期 doi: 10.1007/s11783-018-1027-x
关键词: Groundwater pollution Contaminated land Groundwater remediation Emerging market
Review of operational management in intelligent agriculture based on the Internet of Things
Xiangpei HU, Lijun SUN, Yaxian ZHOU, Junhu RUAN
《工程管理前沿(英文)》 2020年 第7卷 第3期 页码 309-322 doi: 10.1007/s42524-020-0107-3
关键词: Internet of Things (IoT) agricultural Internet of Things (Agri-IoT) operational management intelligent agriculture precision management traceability
An overview of the environmental finance policies in China: retrofitting an integrated mechanism for
LI Wei,HU Mengze
《环境科学与工程前沿(英文)》 2014年 第8卷 第3期 页码 316-328 doi: 10.1007/s11783-014-0625-5
关键词: environmental finance policy integrated mechanism phased evolution implementation progress financial institution environmental management
邹翔,胡传平,方滨兴,陈兵
《中国工程科学》 2016年 第18卷 第6期 页码 23-27 doi: 10.15302/J-SSCAE-2016.06.005
本文对世界主要国家和地区网络电子身份管理的政策、法律法规等情况进行了全面分析与梳理,并结合我国网络身份管理发展国情,提出“十三五”期间我国网络电子身份管理政策法规的发展思路和建设性意见,以期为“十三五”期间我国网络身份管理发展政策法规的制定和修订工作提供借鉴和参考。
Jeremy J. SCHREIFELS, Shuxiao WANG, Jiming HAO
《能源前沿(英文)》 2012年 第6卷 第1期 页码 98-105 doi: 10.1007/s11708-012-0171-4
关键词:
nitrogen oxides (NO
王永红,刘兵,张永刚
《中国工程科学》 2013年 第15卷 第12期 页码 107-112
特长海底隧道运营是一个极其复杂的系统工程,存在较大的不确定性和安全风险。根据隧道工程运营期风险评估的一般流程,对渤海湾海底隧道工程在其运营期的风险进行了评估。评估中考虑的主要风险因素有水害、衬砌裂损、冻害、衬砌腐蚀、震害、洞内空气污染、火灾和列车脱轨事故8 种类型。综合运用信心指数法和层次分析法,参照隧道与地下工程风险接受准则和风险等级标准,对渤海湾海底隧道运营期间的风险进行估计与评价。给出了该海底隧道运营期的风险等级,并讨论了本评估工作中尚存在的一些问题和今后有待深入的工作。
Alessandro CARBONARI, Leonardo MESSI, Berardo NATICCHIA, Massimo VACCARINI, Massimiliano PIRANI
《工程管理前沿(英文)》 2020年 第7卷 第1期 页码 89-103 doi: 10.1007/s42524-019-0037-0
关键词: BIM building management system cyber-physical system facility management holonic system
Ze Sun,Chenglin Liu,Guimin Lu,Xingfu Song,Jianguo Yu
《化学科学与工程前沿(英文)》 2015年 第9卷 第4期 页码 522-531 doi: 10.1007/s11705-015-1539-x
关键词: finite element method magnesium electrolysis cell electric field
《农业科学与工程前沿(英文)》 2021年 第8卷 第1期
• Manure utilization is hindered by separate specialist crop and livestock production systems.
• Improving manure utilization requires organizations for manure exchange.
• Policies and action plans for improving manure utilization are critically reviewed.
• A manure chain approach with third-party contractors is recommended.
Livestock numbers in China have more than tripled between 1980 and 2017. The increase in the number of intensive livestock production systems has created the challenges of decoupled crop and livestock systems, low utilization of manures in croplands, and subsequent environmental pollution. Correspondingly, the government has enacted a series of policies and regulations to increase the sustainability of livestock production. This paper reviews the objectives of these policies and regulations and their impacts on manure management. Since 2017 there have been two policy guides to speed up the appropriate use of manures, three action plans for increasing manure recycling, and one technical guide to calculate nutrient balances. Requirements of manure pollution control and recycling for improved environmental performance of livestock production systems were included in three revised environmental laws. Most recent survey data indicate that the utilization of livestock manures was 70% in 2017, including that used as fertilizer and/or for production of energy. The targets for manure utilization are 75% in 2020 and 90% in 2035. To achieve these targets and promote ‘green livestock production’, additional changes are needed including the use of third-party enterprises that facilitate manure exchange between farms and a more integrated manure nutrient management approach.
胡亚安,张瑞凯,李云
《中国工程科学》 2009年 第11卷 第9期 页码 52-58
从水力学条件论证了船闸采用4级运行方案的可行性。通过原型调试,采取中间及阐首优化后的输水方式运行,基本消除了闸室第一分流口空化,船闸在超过设计的45.2 m水头下工作条件较好,在三峡船闸完建期156 m蓄水位船闸采用4级运行方式具优越性。
标题 作者 时间 类型 操作
Influence of entrainer recycle for batch heteroazeotropic distillation
Laszlo Hegely, Peter Lang
期刊论文
Renewable energy resources, policies and gaps in BRICS countries and the global impact
Lakshmi PATHAK, Kavita SHAH
期刊论文
Development of an integrated structural health monitoring system for bridge structures in operational
Xinqun ZHU, Hong HAO
期刊论文
Review on environmental policies in China: Evolvement, features, and evaluation
ZHANG Kunmin, WEN Zongguo, PENG Liying
期刊论文
A review of condition-based maintenance: Its prognostic and operational aspects
Yanrong LI, Shizhe PENG, Yanting LI, Wei JIANG
期刊论文
An emerging market for groundwater remediation in China: Policies, statistics, and future outlook
Deyi Hou, Guanghe Li, Paul Nathanail
期刊论文
Review of operational management in intelligent agriculture based on the Internet of Things
Xiangpei HU, Lijun SUN, Yaxian ZHOU, Junhu RUAN
期刊论文
An overview of the environmental finance policies in China: retrofitting an integrated mechanism for
LI Wei,HU Mengze
期刊论文
Design and operational considerations for selective catalytic reduction technologies at coal-fired boilers
Jeremy J. SCHREIFELS, Shuxiao WANG, Jiming HAO
期刊论文
Development of a BIM-based holonic system for real-time monitoring of building operational efficiency
Alessandro CARBONARI, Leonardo MESSI, Berardo NATICCHIA, Massimo VACCARINI, Massimiliano PIRANI
期刊论文
Effects of operational and structural parameters on cell voltage of industrial magnesium electrolysis
Ze Sun,Chenglin Liu,Guimin Lu,Xingfu Song,Jianguo Yu
期刊论文
POLICIES AND REGULATIONS FOR PROMOTING MANURE MANAGEMENT FOR SUSTAINABLE LIVESTOCK PRODUCTION IN CHINA
期刊论文