众文网1.急求一篇关于丙烯腈英文文献 谢谢大家了
你好！丙烯腈（Acrylonitrile）的提纯方法：Wash acrylonitrile with dilute H2SO4 or dilute H3PO4 , then with dilute Na2CO3 and water. Dry it with Na2SO4 , CaCl2 or (better) by shaking with molecular sieves. Fractionally distil it under N2 . It can be stabilised by adding 10 ppm tert-butyl catechol. Immediately before use, the stabilizer can be removed by passage through a column of activated alumina (or by washing with 1% NaOH solution if traces of water are permissible in the final material), followed by distillation. Alternatively, shake it with 10% (w/v) NaOH to extract inhibitor, and then wash it in turn with 10% H2SO4 , 20% Na2CO3 and distilled water. Dry for 24 hours over CaCl2 and fractionally distil under N2 taking fraction boiling at 75.0-75.5℃ （at 734 mm）. Store it with 10ppm tert-butyl catechol. Acrylonitrile is distilled off when required. [Burton et al. J Chem Soc, F。
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2.求此论文摘要英文翻译
Anqing petrochemical production of acrylonitrile unit was expounded the basic present situation, the main production technology and dangerous and harmful factors, illustrates the purpose and significance of safety assessment. Analysis of acrylonitrile production unit of each unit, according to the particularity of each unit to choose the appropriate evaluation method, through the evaluation of safety level and gives measures and Suggestions are obtained. The main research contents include: 1. The basic status of acrylonitrile production unit are expounded, for identification of dangerous and harmful factors. 2. According to the division process evaluation unit and evaluation methods to be chosen according to the characteristics of each unit. 3. The tank farm using the method of flammable and explosive, tank farm fire explosion index is given, and safety compensation coefficient, determine the risk level, and calculate the loss of safety recommendations and measures are given. 4. Respond to process complex acrylonitrile unit selects the safety check list method, according to different dangerous harmful factors make the applicable safety checklist. Through grade, assignment, weight calculated safety level and give Suggestions and measures. 5. Easy to produce risk recovery and refining units and ancillary equipment selection of risk analysis in advance, through the possible accident consequences of risk factors, trigger conditions, accidents such as roughly analysis, evaluation of the safety level and give Suggestions to reduce risk.。
3.毕业设计英文翻译,紧急求助
Abstract this design topic 2*200 ton converter mill.This instruction booklet in the practice and in the reference foundation, to studies the knowledge to carry on the comprehensive utilization.Narrated has designed a converter mill the method and the step, in the instruction booklet to the workshop main system for example molten iron supply system, dispersed feeds the supply system, the casting system, left the dregs system and so on to carry on the abundant proof and quite is definite a set of best design proposal.And had determined the workshop craft arrangement, carries on the design to the cross number and the relative position, has summarized its technical process, and carries on the equipment computation in this foundation, including the converter stove computation, the converter preferential motion moment of force and the electrical machinery power computation, the oxygen gun design, the purification system equipment computation, then carries on the workshop computation and uses the equipment the specification and quantity design, carries on the workshop size computation in this foundation, determines each platform elevation and the overhead traveling crane size. Finally to designs uses the new technology to carry on the explanation. Key word: The converter equipment calculates the workshop computation。
4.求毕业设计摘要的英文翻译（中文翻译成英文）
Input required here Translate this graduation project is the most important part of software Pro / E applications and processing of road provision and implementation process knife. Dissertation focused on the parts of which modeling and NC machining process analysis, as well as Pro / ENGINEER Analog processing analysis.
First parts of this thesis to the three-dimensional modeling analysis of CNC machining parts, and then to Pro / E in CNC Machining, have to do a detailed analysis and description. Chapter are the foreword, which we can understand that the PRO / E production in the social development of the industry and its importance. Chapter II is based on the PRO / E parts modeling design, highlighted in the processing of this thesis the process of product modeling software applications.
Through the detailed process descriptions and many images that give readers a clear understanding of PRO / E product design function and related CNC machining. Key words: modeling; CNC machining technology; Analog processing language
Chapter III is the analysis of NC machining process content, in this chapter can be seen that in the production process of how the preparation of CNC machining processes, as well as CNC machining process designed to be basic requirements. Chapter IV are parts in PRO / E software environment for NC machining simulation analysis, as well as the generation of NC instructions. Designed from the present reality, the system introduced on PRO / E of basic applications, the application of functional commands, CNC Machining in PRO / E software in the simulation analysis, and generate CNC machining instructions.
5.毕业设计的英文摘要翻译
With the development of automatic control theory and application of automatic control technology has become an increasingly widespread, automatic control of production and living of the people play a more important role. In this paper, a heating station in the control system hardware and software system design of the heating station so as to achieve automatic control of water temperature on the basis of the application configuration software through Modbus communication protocol, the realization of the entire system of communication line, and ultimately the completion of upper machine level of remote monitoring equipment. In this paper, the research content, technology and the results of the major routes include the following:
1. According to the logic of automatic control, completed the selection of hardware, connectivity and communication design.
2. In the above based on the design of control systems - Automatic Control logic design and implementation of algorithms, we focused on the reconstruction project of the control logic, the use of PID control algorithm and the DDC controller, through the programming Sapro to achieve automatic control system for this heating temperature control station.
3. For device-level configuration of the hardware, the completion of parameter setting.
4. Through the Modbus communication protocol to complete all levels of equipment, controller and host computer communication line.
Test to monitor the heating station platform, complete the design content.
6.毕业设计英文翻译
Routing protocol Graduation Projectd Hoc network is a wired infrastructure does not support mobile networks, network nodes constituted by the mobile host. Ad Hoc network was first used in the military field, which originated in the study of battlefield environment data communication packet radio network project funded by DARPA, later, in 1983 and 1994 can be adapted to network survivability SURAN ( Survivable Adaptive Network) and Global Mobile Information System GloMo (Global Information System) project. Wireless communications and terminals as a result of the continuous development of technology, Ad Hoc Network in the civilian environment has also made progress, such as the need for wired infrastructure in the absence of the temporary communication area can be easily set up through the Ad Hoc network. Ad Hoc network can be seen as a mobile communications and computer networks cross. In Ad Hoc networks, the use of computer networks, packet switching mechanism, rather than circuit-switched mechanisms. Host communications are generally portable computers, personal digital assistant (PDA) such as mobile terminal equipment. Ad Hoc network is different from the current environment of mobile Internet, IP networks. In mobile IP networks, mobile host can be fixed wireline networks, wireless links and dial-up access network, such as lines, and in Ad Hoc wireless network exists only a connection link. In the mobile IP network, mobile hosts through base stations adjacent to the support of cable infrastructure to communications, the base stations and base station (agents and agents) between the wired network are still using traditional Internet routing protocols. And Ad Hoc networks do not support these facilities. In addition, mobile IP network, mobile hosts do not have the routing function, just an ordinary communication terminal. When mobile hosts move from one area to another area does not change the network topology, and mobile Ad Hoc networks of mobile hosts would lead to changes in topology.。
7.毕业设计摘要英语翻译
Abstract Design of this issue for many children hydroelectric dam project Lan He designed the overall layout, the issue is the focus of many children diversion hydroelectric dam project, the flood sediment-dong, spillway and water power generation components of the building. This works mainly in power generation, with a total capacity of 8,130,000 m3, power installed capacity of 3 * 10MW. Normal water level (the design flood level) 1986m, discharge flow 240 m3 / s; Key words: power station hub。
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