共查询到20条相似文献,搜索用时 62 毫秒
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通过对煤焦油加工过程中腐蚀机理的探讨,分析了生产中应重点关注的腐蚀部分,从原料预处理、工艺技术改进和提高设备等级等方面提出了在煤焦油加工过程中有效的防腐方法。 相似文献
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电脱盐设备是煤焦油加氢装置的前期处理的重要设备,因煤焦油自身的特性使电脱盐设备的应用受到限制,文章主要针对煤焦油的特性从电脱盐技术特点、设备条件、操作控制方面进行了闸述,扩大了电脱盐设备的处理能力,找到了一条煤焦油脱盐脱水的处理途径,电脱盐设备在处理煤焦油上的成功投用填补了国内的空白,此设备可在国内广泛推广。 相似文献
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在进行煤焦油的馏程测定时,若煤焦油中的水分含量大于1%,则必须对煤焦油进行脱水试验。支管烧瓶脱水法脱水时间长、速度慢,而且也不能将煤焦油中的水分含量脱成理想状态;溶剂脱水法不仅脱水时间短、速度快,同时还能将煤焦油中的水分含量脱尽,与前者相比具有一定的优越性。 相似文献
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开发出了煤焦油低温分离的新工艺路线和煤焦油分离设备,为提高煤焦油萃取率,从溶剂质量、煤焦油特性、操作温度等几方面进行分析,并采取优化措施,提高了煤焦油萃取率。 相似文献
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王宏成 《中国石油和化工标准与质量》2012,33(15):242
煤炭资源的日益紧张使得煤焦油加工成为人们关注的焦点。本文首先对国外煤焦油加工技术的现状以及未来发展方向进行了简要分析,进而分析了我国煤焦油加工工业的发展现状。在此基础上,本文对我国煤焦油加工技术中存在的三个问题:产品结构单一、设备落后、生产与研究相脱离进行了阐述并提出了相应的解决之道,以促进我国煤焦油加工工业的全面发展。 相似文献
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煤焦油加氢精制生产车用燃料是提高煤焦油附加值及煤焦油清洁利用的有效手段,煤焦油中含氮化合物复杂多样,如何高效脱出含氮化合物中的氮原子是开发煤焦油加氢脱氮催化剂的研究重点.本文简述了煤焦油中含氮化合物的分布情况及特点,综述了煤焦油中吡啶、喹啉、吲哚等典型含氮化合物的加氢脱氮反应网络的研究现状;加氢脱氮催化剂的研究现状从加氢脱氮反应机理、活性组分、载体、助剂4个方面进行了论述.最后针对煤焦油中含氮组分复杂多样的特性提出了研发高效煤焦油加氢脱氮催化剂的一些新方向. 相似文献
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针对传统蒸馏法测定煤焦油水分存在的问题,提出了Na2O2差量法快速测定煤焦油水分的新方法。该方法耗时少,大大降低蒸馏误差和人为误差,提高了检验数据的准确性;此外该方法基本可以实现即时分析,可大大减轻劳动强度和改善检验环境,为快速测定煤焦油水分开辟了一条新的途径。 相似文献
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Cryogenic recovery of tar from Athabasca tar sand could be an attractive alternative to the conventional hot water separation process. It is based on the fact that when frozen tar sand is ground, distinct particles of tar and sand are obtained and can be separated by elutriation. A specially designed fluidized bed grinder was developed for operation at temperatures in the range ?30 to ?130°C. Preliminary experiments have shown that 88% of the tar can be removed from the sand. Improved results can be expected after further optimization of the unit. 相似文献
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C. S. B. Nair D. K. Sen A. N. Basu 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》1967,17(4):113-117
Aqueous acetamide has been found to be a good solvent for the extraction of tar acids from low temperature carbonisation tar oils. Saturated acetamide solution at 15–30° in the molar ratio acetamide/tar acids of 3 : 1 effects a recovery of about 90% of tar acids originally present in the oil in two extraction stages. The tar acids are obtained in 77% purity, the impurities consisting of neutral oils and tar bases. Re-extraction with light petroleum can raise the purity of tar acids to 94%. Tar acids can be separated from the purified acetamide extract by suitable dilution with water. The system tar acids—(bases + neutral oils)—saturated aqueous acetamide has been studied. It has been shown that three theoretical counter-current extraction stages are required to effect a recovery of 95% of tar acids from a feed oil containing 45% tar acids. 98% recovery of the tar acids could be achieved in four stages. 相似文献
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Krishnan G. Das Jammalamadaka V. Prasad Rugmini Devi Gurubhagavatula K. Viswanadha Rao 《Fuel》1985,64(1):139-141
A method involving acid extraction, fractionation, derivatization and g.c.-m.s. analysis was used to characterize the basic nitrogen compounds in coal tar. It was found that these compounds fall into ten compound types belonging to eighteen homologous series. Separation of aza-arenes from amines by derivatization is recommended as a better procedure. 相似文献
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Yu. V. Pokonova 《Solid Fuel Chemistry》2007,41(4):246-247
An ampholyte with an exchange capacity of 3.9 or 7.6 mg-equiv/g for 0.1 N HCl or 0.1 N NaOH, respectively, was prepared based on a weakly basic anion exchanger from the polycondensate of shale tar by the radiation grafting of acrylic acid. 相似文献
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We know that increasing the water content in coal tar above 4% and the ash content above 0.1% hinders its processing: soda
consumption is increased; greater heating is required in dehydration; and it is impossible to comply with standards regarding
the ash content in pitch coke and electrode pitch. Recently, the trend has been to introduce a centrifuge ahead of the final
tar store in systems for conditioning coal tar. 相似文献
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采用小型气流床热解实验装置进行焦油热解实验,考察了温度对焦油热裂解过程的影响,同时选择甲苯作为焦油模型化合物研究焦油热解过程中的组成变化,得到了焦油的热解特性。结果表明:热解温度对焦油和甲苯转化率影响大,在800—1 100℃之间,焦油和甲苯的转化率及气体产率均随温度增加而上升,在N_2气氛下的最高转化率分别为70.29%和90.11%,且温度的升高会促进炭黑的生成。H_2会略微降低甲苯的转化率,但是对炭黑的生成有明显抑制作用。升高温度会使甲苯热裂解后产物种类减少,含支链化合物基本消失,形成更稳定的多环芳烃化合物,且会促进甲苯的缩聚。 相似文献