首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   208篇
  免费   12篇
  国内免费   1篇
综合类   5篇
化学工业   121篇
金属工艺   4篇
机械仪表   1篇
建筑科学   1篇
矿业工程   1篇
能源动力   4篇
石油天然气   78篇
一般工业技术   3篇
自动化技术   3篇
  2023年   4篇
  2022年   3篇
  2021年   2篇
  2020年   3篇
  2019年   5篇
  2018年   2篇
  2017年   8篇
  2016年   5篇
  2015年   10篇
  2014年   17篇
  2013年   10篇
  2012年   15篇
  2011年   14篇
  2010年   17篇
  2009年   12篇
  2008年   9篇
  2007年   11篇
  2006年   3篇
  2005年   12篇
  2004年   6篇
  2003年   4篇
  2002年   6篇
  2001年   7篇
  2000年   6篇
  1999年   10篇
  1998年   5篇
  1997年   7篇
  1996年   3篇
  1995年   1篇
  1994年   1篇
  1992年   1篇
  1991年   1篇
  1987年   1篇
排序方式: 共有221条查询结果,搜索用时 15 毫秒
1.
由于天然气净化厂脱硫胺液中含有甘醇类降解产物,二甘醇(DEG)和三甘醇(TEG)难于准确称量,以DEG或TEG为内标物的毛细管气相色谱法测定胺液中MDEA的含量时,会产生较大的误差。为避免这种影响,建立了以甲苯为内标物的毛细管气相色谱测定法:选用美国Agilent HP-50+毛细管柱来分析胺液中甲基二乙醇胺(MDE)的含量;定量方法为内标法;对三甘醇(TEG)和甲苯进行分析对比,最终选用甲苯作为内标物;使用MINITAB 15.1处理实验数据。实验结果表明:MDEA和甲苯出峰稳定,重复性好;方法回收率为99%~101%,相对标准偏差<2%。该法精密度和准确度较高,不仅可用于天然气净化厂胺液中MDEA含量的测定,而且对同类胺液的MDEA含量测定研究也有一定的借鉴作用。  相似文献   
2.
This work is a companion to a previous article, Part I, published in The Canadian Journal of Chemical Engineering, dealing with CO2 absorption in aqueous solutions containing a single aminic reagent (specifically methyldiethanolamine (MDEA) or piperazine (PZ)). In this second part, different PZ/MDEA mixtures are experimentally studied and their performances are compared with that of the single reagents. It is indeed well known that small quantities of PZ added to MDEA aqueous solutions are sufficient to obtain a significant improvement in the kinetics of the process. PZ is considered an activator or promoter for MDEA, but the mechanism of this synergy has still not been clearly demonstrated. The aim of this study is an attempt to understand how PZ and MDEA can interact by experimentally analyzing this beneficial mutual effect and by explaining it with the help of a suitable yet not complex model. We believe that the involved chemistry is not more complex than that reported in Part I for the single reagents. According to our findings, it is MDEA that enhances the action of PZ, as opposed to what many authors claim. Moreover, our results seem to rule out the existence of any PZ shuttle effect.  相似文献   
3.
在低碳硫比的条件下(H2S体积分数3.0%,CO2体积分数5.0%),考察了温度与胺液体积分数对吸收效果的影响,结果表明,反应温度40℃、胺液体积分数35%~45%为最佳反应条件。对比了MDEA与TBEE对模拟天然气中H2S和CO2的脱除性和选择性,并研究了MDEA与TBEE复配形成的混合溶液对酸气的吸收情况,实验结果显示,TBEE的选择性大于MDEA的选择性,且TBEE对CO2和H2S的吸收效果明显优于MDEA,随着空间位阻胺TBEE在溶液中所占比例的增加,选择性和碳硫容逐渐增加。复合溶液能耗低于MDEA溶液。  相似文献   
4.
The foaming phenomenon of N-methyldiethanolamine(MDEA) solution used in desulfurization process occurs frequently in the natural-gas purification plant. The foaming phenomenon has a strong impact on operation of the process unit. The salt impurities are the main reason for causing the foaming of MDEA solution, so the full analysis of salt impurities is necessary. A method for comprehensive analysis of salt impurities in MDEA solution used in desulfurization process was established. Anions and non-metallic cations of MDEA solution were determined by different conditions of ion chromatograph, respectively. Metallic cations of the solution were detected by atomic absorption spectrophotometer with the N2O-C2H2 flame absorption. The analytical results of salt impurities in the desulfurization solution can provide a theoretical basis for an accurate analysis of the factors affecting the foaming of MDEA to unveil further control measures.  相似文献   
5.
中国海洋石油总公司(以下简称中海油)近年来为开发在南中国海发现的一批高含CO2的天然气田,通过与国内相关单位联合攻关并消化吸收国外MDEA溶液脱除CO2技术,依靠自身及国内力量,在海南省东方市建成了国内大规模的MDEA脱除CO2装置。具有MDEA贫液、半贫液二段吸收,减压、汽提二次解吸再生特点的CO2脱除工艺流程不仅降低了装置投资,而且具有高CO2净化度、低能耗和溶剂损失少等优势,该装置年平均稳定完好运行达350天,净化气质CO2含量小于1.5%,完全满足下游用户对气质的要求。经多年实际运行证明,该技术应用于大规模CO2脱除装置是合理和可行的,近年来在中海油已得到广泛应用。  相似文献   
6.
由于整体煤气化联合循环(IGCC)发电本身的技术特点,使得其非常适合于进行燃烧前CO2捕集。针对IGCC特点,提出了一种MDEA脱酸气结合湿法氧化法硫回收的燃烧前CO2捕集流程。通过模拟计算,验证了流程的可行性。将其与IGCC发电系统集成,对比计算了有无燃烧前CO2捕集的IGCC系统供电效率等相关参数,燃烧前CO2捕集使IGCC供电效率降低约10个百分点。分析指出了导致包含燃烧前CO2捕集的IGCC供电效率降低的3个因素:蒸汽消耗、燃料化学能损失和新增动力设备电耗,并据此确定了今后的优化方向。  相似文献   
7.
This paper proposes a methodology to improve the sustainability of industrial processes combining two tools: BAT Analysis and process simulation. Both tools are jointly applied to identify the IF of the analyzed process, so that the most appropriate candidate techniques from an inventory can be selected. The selected alternatives are tested in different scenarios that are evaluated using simulation, which would determine the configuration that best improves the sustainability of the process. The combination of both tools in an integrated methodology will help decision makers to select the most sustainable configuration for a given process. The methodology is validated in a case study: a hydrogen production plant. After analysing several scenarios where different candidate techniques are implemented, results show that the IF identified can be highly improved when the appropriate combination of BAT is applied.  相似文献   
8.
天然气脱硫系统中胺液经常出现发泡的问题。对胺液中不同种类杂质对胺液起泡性和泡沫稳定性的影响和泡沫分离进行了实验研究,结果表明表面活性剂、固体悬浮物等物质可以反向通过泡沫分离将其从胺液中分离出来,从而很好地降低胺液起泡性和泡沫稳定性,经过48h的泡沫分离,胺液的主要性质基本不变,但最大泡沫高度和泡沫半衰期分别从分离前的4.0cm和31s降到了分离后的0.6cm和1.2s,并且悬浮固体含量从1.7g/L降到1.2g/L。向胺液中加入十六烷基三甲基氢氧化胺,观察悬浮颗粒和正己烷的去除效果,结果显示热稳盐含量、pH、有机胺浓度基本无变化,胺液上层无漂浮的正己烷,阳光下观察溶液更加澄清透明,但是所测量悬浮固体含量却大大增加。  相似文献   
9.
本文针对MDEA 在液化气脱硫生产运行过程中,因杂质和盐的不断带入,使胺液发生降解,吸收效率逐渐下降,导致产品质量不合格,设备、工艺管线出现孔蚀引起胺液泄漏、环境污染等现象加以分析,并作出相应的解决对策,提高胺液的吸收效果,保证液化气质量合格,使装置达到了优质高效长周期运行的目的.  相似文献   
10.
In this survey, we use the emPR-CPA equation of state to model a ternary system of H2S solubility in MDEA aqueous solution at different solution compositions, temperatures, pressures, and acid gas loadings. For electrolyte part of the model, MSA theory and the Born term were used. There were 302 experimental data used in this work. To model a ternary system, at first pure components, then binary subsystems, and finally ternary system were modeled using a reactive bubble point pressure calculation method. An overall absolute average deviation percentage equal to 20.85 was achieved so that show the model efficiency for correlation of such systems.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号