馏程不同的两种煤沥青的缩聚沥青的热解行为研究

用热重法（TG）、微商热重法（DTG）研究了馏程不同的两种煤沥青的缩聚沥青的不同升温速率的热解行为。分析了影响两种缩聚沥青热解行为不同的原因。     

高性能炭材料生产用煤沥青的研究

研究了软化点在评价煤沥青聚合程度中的作用；描述了热聚合改质过程中煤沥青热解缩聚行为，分析了中温煤沥青热聚合改质过程中各种沥青组分随热聚合温度和热聚合时间的转变规律，探讨了QI组分影响煤沥青热聚合改质的机理，认为原料煤沥青所含原生QI炭微粒促进了热聚合改质过程中煤沥青芳烃分子的聚合；描述了煤沥青的流变性能及其在炭材料实际生产中的意义，研究了中温沥青和改质沥青高温流变性能的差异，探讨了硬脂酸和油酸对煤沥青的改性作用；分析了煤沥青的热解缩聚特征，研究了升温速率对煤沥青热解缩聚的影响。     

超高功率石墨电极生产用炭糊料热解缩聚行为研究

通过TGA对超高功率石墨电极生产用炭糊料的热失重过程进行了研究,分析了炭糊料的热解缩聚特征,并对炭糊料和黏结剂煤沥青的热解缩聚行为进行了对比分析.结果表明,炭糊中煤沥青热解挥发过程不同于单体煤沥青,骨料针状焦的存在使黏结剂煤沥青易发生缩聚反应,从而有利于煤沥青稠环芳烃分子缩聚成焦,从而提高了黏结剂煤沥青的结焦值.     

用红外光谱研究煤沥青粘结剂及其炭化产物

采用红外光谱对两种煤沥青粘结剂及其炭化产物进行了研究，比较了中温沥青和改质沥青的结构组成，并跟踪分析了煤沥青粘结剂在炭化过程中所发生的热解缩聚变化。     

沥青树脂热解缩聚行为和流变性能研究

对沥青树脂热解缩聚过程和流变性能进行了分析，试验结果显示，沥青树脂的热解缩聚可分为熔融及轻质组分脱除、剧烈热分解和缩聚成焦三个阶段。在第1、第3阶段，升温速率对沥青树脂的影响较小，在第2阶段，升温速率加快，导致沥青树脂开始失重温度向高温区移动，失重速率随之增大。选取沥青树脂作为浸溃剂，其浸溃温度确定为260℃，可使浸渍时沥青树脂处于较好的流动状态。     

热聚合改质过程中煤沥青热解缩聚行为的研究

在20升热聚合反应釜中对中温煤沥青进行热聚合改质处理，研究了热聚合改质过程中煤沥青热解缩聚行为，讨论了煤沥青结焦值随聚合时间和聚合温度的变化，并找出了热聚合改质过程中煤沥青结焦值和甲苯不溶物之间的关联性。     

热聚合改质过程中煤沥青组分转变规律的研究

在 2 0 L热聚合反应釜中 ,研究了中温煤沥青热聚合改质过程中各种沥青组分随热聚合温度和热聚合时间的转变规律 .结果表明 ,在煤沥青热解缩聚期间煤沥青的甲苯不溶物和次生喹啉不溶物组分生成转变具有一定的规律性 ,并指出了其对煤沥青生产的指导意义 .     

煤沥青的热解特性分析

煤沥青的来源丰富、价格低廉、用途比较广泛,所以了解其理化性质以及热性能显得尤其重要。本文通对软沥青和改质沥青分别进行了γ组分和β组分的萃取。以热重分析法作为检测手段,分析考察了煤沥青的种类,升温速率及族组成的热解规律。实验结果显示:煤沥青中γ组分含量越高,软化点越低,其热解越趋于低温方向同时失重越多。β组分含量高时整个热解过程向高温移动,失重量减少。升温速率越大整个热解过程向高温移动,失重量越大。     

升温速率及热解温度对煤热解过程的影响

为了研究煤热解过程中升温速率及热解温度对热解产物分布及热解过程吸热量的影响,采用热重和热红联用技术对煤热解过程进行了分析.研究了不同升温速率和热解温度对煤热解过程的气态产物分布的影响,并对所产生的焦炭性质进行了分析.结果表明:煤的整个热解过程的吸热量随升温速率的增加而减小;煤热解产生的焦油组分含量包括芳香族、脂环族和脂肪族含量达到最大值所对应的热解温度随升温速率的增加产生滞后现象,但是煤热解产生的煤气成分随着升温速率增加而急剧释放;随着热解温度的升高,焦炭结构逐渐致密,裂纹及裂缝产生,芳香晶核增大,同时焦炭中的氧和氮含量由于含氮和含氧化合物的继续分解而降低.     

二乙烯基苯改性煤沥青的热解行为研究

研究了二乙烯基苯(DVB)改性中温煤沥青的常压热解行为.采用SEM,TG-DTG和Raman等技术对改性煤沥青的形貌、热解过程及产物的结构进行表征.研究表明,DVB改性煤沥青中出现粒状物聚集体,改性前后煤沥青的热解行为发生了很大的变化;通过常压热解DVB改性煤沥青,可制备出粒径小于5μm且有序度较低的炭微球.     

A thermoanalytical study of the co-pyrolysis of coal-tar pitch and petroleum pitch

Four pitch blends were prepared at laboratory scale by mixing a coal-tar pitch and a petroleum pitch in several proportions (CTP:PP 85:15, 70:30, 55:45 and 40:60). Single pitches and blends were characterized by standard procedures, infrared spectroscopy and size exclusion chromatography. Pyrolysis behaviour and interactions between the two pitches in the blends were studied by thermogravimetric analysis (TG/DTG) and differential scanning calorimetry (DSC). The results show that blending does not alter the composition of pitches. However, the TG/DTG curves reveal that coal-tar pitch and petroleum pitch interact actively during pyrolysis, modifying the temperature of initial weight loss and the temperature of the maximum rate of weight loss. Primary quinoline-insoluble particles present in coal-tar pitch and transferable hydrogen seem to be the main factors responsible for these modifications. The DSC curves show that the presence of coal-tar pitch in the blends reduces the reactivity of the petroleum pitch and shifts the exothermic peaks observed at the temperature of the cracking/polymerization reactions (>400 °C) to lower temperatures.     

TGA在精制沥青研究中的应用

通过改变试样量和升温速率,利用热解重量分析仪研究精制沥青的热解过程,为沥青的聚合和炭化过程的控制提供依据。研究发现,适当增加试样量,可以提高热分析的准确性;精制沥青进行聚合的温度要介于主要热解温度和次要热解温度之间;同时,为了有利于聚合反应的进行并提高收率,应当适当降低反应的升温速率。     

酚醛树脂对均相成核的中间相炭微球生成的作用

在QI含量很低的沥青中加入适量的酚醛树脂，可以改变沥青生成中间相炭微球的热缩聚反应，进而改变中间相炭微球的形貌与微观结构。酚醛树脂在沥青稠环芳烃分子热缩聚过程的初期形成共晶，在后期充当炭微球的交联剂的作用，使中间相炭微球的收率增加，尺寸变大，并影响了中间相炭微球的织构，红外光谱分析表明酚醛树脂已参与了中间相炭微球的形成；偏光显微镜、扫描电镜形象地表征出了中间相炭微球的微观织构以及酚醛树脂的作用。     

电极沥青粘结剂性能评价参数相关性的研究

以两个国外电极沥青粘结剂产品为参考样,选用典型国产原料以热化学改质法和调和法制备出工业分析指标与参考样处于同一水平的两组煤沥青粘结剂试样;对各组粘结剂试样和相应的参考样的元素组成、流变学性质、热动态行为、平均分子量及其分布以及各评价参数间的相关性进行了研究;就引入与其应用性能直接相关的评价因子的可能性进行了探索。     

炭材料生产中煤沥青流变性能的调节

煤沥青流变性能对炭材料生产影响极大,煤沥青流变性能的合适调节及相应工艺参数的优选对于提高炭材料质量有着重要的作用。文章讨论了混捏、成型、焙烧和浸渍过程中影响煤沥青流变性能的因素,分析了工艺参数变化对煤沥青流变性能的调节作用,提出了改善煤沥青流变性能的措施。     

炭材料生产用煤沥青的流变性能

介绍了流体的特性及其表征，描述了煤沥青的流变性能及其在炭材料实际生产中的意义，综述了煤沥青流变性能研究状况。提出了炭材料生产用煤沥青流变性能研究所面临的课题。     

Pyrolysis of polycarbonate in coal-tar pitch

The thermal degradation of polycarbonate in coal-tar pitch was studied. The composition of the liquid products of pyrolysis was determined with the use of gas chromatography–mass spectrometry; the modified coal-tar pitch and the pyrolysis residue were studied by Fourier transform IR spectroscopy, elemental analysis, and the determination of softening point, concentrations of substances insoluble in toluene and quinoline, and yields of volatile substances. Because of chemical interaction with coal-tar pitch, the thermal degradation of polycarbonate in coal-tar pitch occurs at considerably lower temperatures than destruction without a solvent with high selectivity for phenol and p-isopropylphenol. Hydrogen transfer from the coal-tar pitch to the polycarbonate degradation products initiates polycondensation reactions in the coal-tar pitch.     

Co-coking of coal with pitches and waste plastics

Liquid-phase co-thermolysis of waste plastics (e.g. polystyrene, polycarbonate, polyurethane, polyvinyl chloride, tire rubber, unsaturated polyester resin, melamine-phenol formaldehyde resin, polyethylene, polyamide, polyethylene terephthalate, phenol formaldehyde resin) with coal-tar pitch at temperatures up to 400°C yielded gases, pyrolysis oils, and high-melting pitches (reaction pitches). Thermogravimetric analysis of these pitches showed that they were thermally stable up to the plastic temperature range of coals. Hence, the reaction pitches could be used as reactive additives for weak-coking coals to improve their coking properties.     

Structural characterization of pitch feedstocks for coke making: Use of 13C coupled 1H n.m.r. spectroscopy

Several pitches, used to make high-grade cokes, are characterized by ¹³C and ¹H n.m.r. spectroscopy. Average molecular parameters of solvent fractions of the pitches indicate distinct differences in molecular structure. Principal differences between A-240 petroleum and medium coal-tar pitches are composition of fractions, aromaticity, degree of aromatic condensation and amount of naphthenic groups. The mild conditions of production of A-240 petroleum pitch leads to the formation of methylene bridges and biaryl linkages between two aromatic moieties in constituent molecules.