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氟哌酸合成工艺优化
目的：本文主要从氟哌酸的合成路线出发，探讨氟哌酸合成工艺的优化方法。方法通过对氟哌酸的合成路线进行分析，探讨可以跟上时代脚步的新合成工艺。结果氟哌酸合成工艺的优化主要包括三种：缩哌嗪和乙基化合成新工艺、7-位氟取代合成新工艺以及硼螯合物合成新工艺。结论随着科学技术的不断进步和社会的迅速发展，医药技术的发展进程也在不断加快，氟哌酸作为第三代喹诺酮类抗菌药物，具有副作用小、和其他抗菌素无交叉耐药性、组织渗透性好、生物利用度高、抗菌谱广以及抗菌作用强等特点，特别是对于革兰阴性杆菌具有非常强的杀菌作用。再加上吸收快、服用方便，目前已经广泛应用与尿道炎、肾盂肾炎、扁桃体炎以及咽喉炎等的治疗中。...
2020-10-22 17:35:41浏览：47
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联合两段氧化制合成气/F-T合成的GTL工艺和催化剂
A novel process for catalytic oxidation of methane to synthesis gas (syngas), which consists of twoconsecutive fixed-bed reactors with air introduced into the reactors, integrated Fischer-Tropsch synthesis, was inves-tigated. At the same time, a catalytic combustion technology has been investigated for utilizing the F-T offgas togenerate heat or power energy. The results show that the two-stage fixed reactor process keep away from explosionof CH4/O2. The integrated process is fitted to produce diesel oil and lubricating oil in remote gas field....
2020-10-02 20:35:09浏览：54
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乙炔法生产氯乙烯工业研究进展
综述了氯乙烯合成工艺的最新研究进展,讨论了不同工艺以及催化剂的优缺点.将无汞工艺与目前国内比较成熟的含汞工艺进行了比较,指出了无汞工艺法是国内未来氯乙烯合成工艺的发展趋势....
2020-09-29 10:54:18浏览：29
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乙烯厂污水回用实例介绍
在乙烯厂中，因污染因子多，污水含油高等因素限制了污水回用技术的推广。此外，在环保要求愈来愈严格的今天，浓排水的妥善处理是另一个影响因素。在某石化企业的应用实例中，采用曝气生物滤池+臭氧+超滤+反渗透双膜法处理污水，回用于循环冷却水，同时采用臭氧氧化将难处理的反渗透浓排水处理到满足地方污水指标。工程实践证明这些方法在乙烯厂的污水回用处理中行之有效。...
2020-09-28 16:47:12浏览：38
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生物膜法处理校区污水
利用两种生物膜技术处理高校生活污水进行了试验研究,结果表明,接触氧化法优于生物转盘法;在停留时间为4h,接触氧化法对CODCr和NH3-N的去除率分别为78.5%和75.6%,出水能达到《城市污水再生利用城市杂用水水质（》GB/T18920-2002）标准;随着气水比的增大,CODCr、NH3-N的去除率先增大后减小,其适宜的气水比为15∶1;出水CODCr浓度随CODCr容积负荷的增大而升高,合理的CODCr容积负荷为6～8kgCODCr/（m3.d）....
2020-09-25 09:10:57浏览：46
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医院污水特点与处理技术
生活污水、工业废水是我国水体的主要污染源.对此,目前的污水处理技术已基本成熟并趋于完善.而医院污水成分复杂,含有有毒、有害污染物,且部分污水还带有相关疾病的传染源.2003年“非典”以后,很多国家对医院的污水处理要求更高更严密.医院污水处理涉及疾病的防疫、控制和防止二次污染的产生,一旦疏漏,对社会环境、自然环境都会造成重大影响.因此,医院污水的处理,尤其是传染病污水的处理非常重要....
2020-09-25 09:10:57浏览：25
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动力煤选煤厂选煤工艺现状及展望
为建立先进、高效、大型化的动力煤选煤厂,分析了动力煤分选的特点,论述了入料原煤不同粒度下的动力煤选煤工艺优缺点及应用情况,并对动力煤选煤工艺进行展望.动力煤分选具有产品结构多元化;以提高精煤发热量,排除矸石及杂物为目的;对产品水分的要求严格;分选盈利性较差等特点.采用50 mm以上块煤和末煤分级入选,减少细粒原煤及系统煤泥入选量,特别减少＜3 mm入选量,可实现动力煤选煤厂精煤产率最大化.开发先进、高效、大型化、低能耗的煤泥水处理工艺及设备;研究高效率、细粒径的干法深度筛分设备,提高筛分效率;开发高效的浓缩分级浮选工艺和设备是动力煤选煤厂的发展趋势....
2020-09-18 16:34:07浏览：30
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利用煤的形成过程提质褐煤
褐煤的高水分量几乎影响褐煤利用的每一方面。为了实现褐煤资源的高效利用,本文中利用煤的形成过程设计了一套褐煤提质工艺,主要是模拟一个高压、高温的环境加速褐煤转变。工艺中要求合适的压力和温度,可以明显提高脱水率。...
2020-09-15 12:28:59浏览：52
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Volumetric fraction measurement in oil-water-gas multiphase flow with dual energy gamma-ray system
Volumetric fraction distribution measurement is a constituent part of process tomography system in oil-water-gas mulfiphase flow. With the technological development of nuclear radial inspection, dual-energy γ-ray techniques make it possible to investigate the concentration of the different components on the cross-section of oil-water-gas multiphase pipe-flow. The dual-energy gamma-ray technique is based on materials attenuation coefficients measurement comprised of two radioactive isotopes of 241Am and 241Cs which have emission energies at 59.5 keV and 662 keV in this project. Nuclear instruments and data acquisition system were designed to measure the material's attenuation dose rate and a number of static tests were conducted at the Multiphase Laboratory, Institute of Mechanics, Chinese Academy of Sciences. Three phases of oil-water-gas media were investigated for their possible use to simulate different media volumetric fraction distributions in experimental vessels. Attenuation intensities were measured, and the arithmetic of linear attenuation coefficients and the equations of volumetric fractions were studied. Investigation of an unexpected measurement error from attenuation equations revealed that a modified arithmetic was involved and finally the system achieved acceptable accuracy in experimental research....
2020-09-15 12:28:59浏览：61
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The key stage and moment of coalbed gas reservior evolution in the Qinshui Basin, China
The evolution of coalbed gas reservoir is characterized by coalbed gas geochemistry and gas content. On the basis of burial history and thermal history, the forming process of coalbed gas reservoir and the gas accumulative history in the Qinshui Basin are discussed in this paper. The difference of the thermal history, geochemistry characteristic,and gas accumulative history between Yangcheng and Huozhou areas shows that the formation of coalbed gas reservoir in the Qinshui Basin is controlled by the geological process in the critical stage and the critical moment. The components and isotopes of coalbed methane are determined by the stage at which the coal maturation reaches its maximum rank. The coalbed methane accumulative history is related to the temperature and pressure of the coal burial history, because the coalbed gas is mainly in adsorptive state.It is stated that the gas content in the coal seam is controlled by the moment when the coal seam is uplifted to the shallowest position....
2020-09-15 12:28:59浏览：61
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An electricity price model with consideration to load and gas price effects
Some characteristics of the electricity load and prices are studied, and the relationship between electricity prices and gas (fuel) prices is analyzed in this paper. Because electricity prices are strongly dependent on load and gas prices, the authors constructed a model for electricity prices based on the effects of these two factors; and used the Geometric Mean Reversion Brownian Motion (GMRBM) model to describe the electricity load process, and a Geometric Brownian Motion(GBM) model to describe the gas prices; deduced the price stochastic process model based on the above load model and gas price model. This paper also presents methods for parameters estimation, and proposes some methods to solve the model....
2020-09-15 12:28:59浏览：58
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EXPERIMENTAL STUDY OF HFC-134a GAS HYDRATE FORMATION PROCESS
Refrigerant gas hydrates have brilliant prospects as cool storage material of air-conditioning system. In this paper, when the ratio of the weight of HFC-134a to that of water is 2. 17%, systematic experiments have been carried out on the formation process of the HFC-134a gas hydrate including of the phase equilibrium, the influence of supercooling degree, and the influence of agitation. The results indicate that the critical decomposition temperature and the critical decomposition pressure of R134a hydrate is 283.4K and 414K respectively, the formation of gas hydrate was promoted with increasing the supercooling degree and the agitation. However, it is desired that the supercooling degree is smaller.Therefore, it is important problem that the study of optimum of supercooling degree for cool storage system....
2020-09-15 12:28:59浏览：67
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