共查询到19条相似文献,搜索用时 281 毫秒
1.
经分析考察可知,FCC油浆经糠醛多级溶剂抽提后所得的富芳馏分(FCCRF)有着作为中间相沥青原料的优秀性能,从热台显微镜可以明显地看到最终形成的中间相呈广域流线型大融并体,且粘度较低,流动性能好,可溶性强,是纺制炭纤维的优质中间相体。实验考察了以FCCRF为原料用热处理的方法制备中间相沥青,测试了其可纺性能,结果表明以FCCRF油浆为原料所制得的中间相沥青呈大融并体状,软化点低,其粘温曲线中存在较大的平稳流动区域,可纺性能好。 相似文献
2.
本文为了掌握油浆性质及其脱除固体颗粒及胶质、沥青质等非烃重组分影响因素,以延长石油集团生产过程中的FCC油浆和DCC油浆为原料,对比了两者的基本性质,对所含固体颗粒的性质进行了深入的分析表征,进一步以溶剂抽提法考察了溶剂、温度、剂油比、分离时间等因素对脱除固体颗粒及胶质、沥青质等非烃类组分收率的影响。实验结果表明,溶剂抽提分离对FCC油浆、DCC油浆脱除固含量及胶质、沥青质等非烃组分具有良好的效果,在正辛烷为溶剂、温度为60℃、时间为40min、搅拌速度为150r·min-1和剂油比为1.5:1的适宜条件下,FCC油浆和DCC油浆的烃类组分收率分别为96.84%、79.15%,固含物的脱除率在95%以上,有利于低值油浆进一步生产高值化产品。 相似文献
3.
《炭素科技》2002,12(1):44-45
第五届全国新型炭材料学术研讨会于2001年10月在四川绵阳召开,来自全国各地的180多位代表参加了研讨会,来自全国各地的180多位代表参加了研讨会,成会明、徐正和李克健分别做了“纳米管的研究进展”、富勒烯及其衍生物的物理和化学”和“关于我国炭纤维的建议”大会发言,大会分设四分会场,涉及炭质原料及前驱体、炭材料制备工艺及设备、炭基纤维及复合材料、炭质活性材料吸附与表面科学和炭基插层及渗杂改性材料,会议邀请了日本炭素专家同代表们进行了学术交流。会议论文题录如下:1.石油系油浆与煤系闪蒸油的焦化性能I:聚合条件的影响;2.石油系油浆与煤系闪蒸油的焦化性能Ⅱ:焦化条件的影响;大港常渣超临界萃取馏分制备中中间相沥青的研究;5.减压渣油与FCC油浆共炭化的化学氢研究I:芘的转化;7.在不同超临界体系下重质渣油的加氢研究。 相似文献
4.
以SLO-LH、SLO-SH和SLO-YN催化裂化油浆为原料,利用热缩聚法制备中间相沥青,系统分析了油浆的烃组成分布、沸点分布以及核磁结构特征,关联了中间相沥青光学织构与原料性质组成关系。结果表明,SLO-SH和SLO-YN油浆中的分子量和组成分布较窄,在给定反应条件(430℃、0.7 MPa)下制备中间相沥青的光学织构指数(OTI)值分别为45和50,中间相织构主要由大面积的域及流域组成,镶嵌结构较少。相对于SLO-SH与SLO-YN,SLO-LH样品的烃组成与沸点分布明显疏散,得到的中间相主要由镶嵌组织与小域构成。结果表明集中分布且芳烃含量高有利于得到高收率与高OTI值的优质中间相沥青,对油浆组分进行分离是制备高品质中间相沥青和针状焦的必要途径。 相似文献
5.
《高科技纤维与应用》2021,46(4)
中间相沥青是由重质芳烃类物质(煤焦油沥青、石油沥青和纯芳烃类物质及其混合物等)在中温液相炭化热处理过程中形成的一种具有较大区域范围内晶体光学各向异性的液晶态物质。本文以催化裂化油浆为原料制备中间相沥青,考察不同原料特性对中间相沥青的影响,研究了中间相沥青的形成机理。通过工艺参数的优化,所制备的石油基中间相沥青可以达到以下性能:中间相含量在95%~100%之间,软化点为250~290℃时,结构呈现广域流线型结构,制备的碳纤维具有极高的导热率。 相似文献
6.
7.
8.
9.
本文研究了大直径中间相沥青炭单丝的不熔化过程。不同恒温时间的不熔化过程中元素量的变化及其红外光谱分析指出了不熔化的原理。研究结果表明不同的不熔化条件使最终的大直径中间相沥青炭单丝的力学性能及横截结构产生了明显的差异;随着恒温时间的加长(直至恒温4h)以及升温速率的减少,大直径中间相炭单丝的取向度增加,此趋向与大直径中间相沥青炭单丝的强度变化相一致。 相似文献
10.
11.
流化催化裂化重芳烃试制沥青碳纤维 总被引:10,自引:0,他引:10
探索了流化催化裂化 (F CC)重芳烃试制沥青基碳纤维的可行性 ,初步实验表明 ,FCC重芳烃中芳烃含量高 ,相对分子质量分布和环结构较均匀 ,是制备中间相沥青碳纤维的优良原料 ,并能制备出接近中强水平 (抗拉模量在 80~ 10 0 GPa)的中间相沥青碳纤维。降低中间相沥青的杂质含量 ,可大幅度提高沥青碳纤维的力学性能 相似文献
12.
Modified characteristics of mesophase pitch prepared from coal tar pitch by adding waste polystyrene
The toluene soluble of coal tar pitch was carbonized with waste polystyrene. The properties of mesophase pitches were characterized using polarized light optical microscope, apparent viscometer, FT-IR, 1H NMR and X-ray diffractometer. After adding the waste polystyrene into the toluene soluble of coal tar pitch, the soluble mesophase were was increased from about 9% to 52% and the mesophase pitches were changed from 74% with coarse mosaic texture to 100% with flow domain texture. The mesophase pitches were transformed from thixotropy to unthixotropy. By waste polystyrene added into the toluene soluble of coal tar pitch, the methylene group was increased a lot. The presence of more alkyl groups modified the characteristics of mesophase pitches and improved the assembly of mesophase pitch molecules. 相似文献
13.
14.
15.
16.
17.
The formation of cokes and graphites proceeds via the creation from the isotropic fluid phase of carbonization of pitch and coal, of lamellar nematic liquid crystals or mesophase. This anisotropic fluid, deformable mesophase, develops as spheres within which constituent molecules are stacked parallel to an equatiorial plane. This type of structure facilitates coalescence to a coherent mass which eventually forms a graphitisable carbon. The ‘onion-skin’ structure of mesophase spheres cannot so coalesce. Different optical textures of cokes and graphites owe their origin to different chemical reactivities and fluidities of mesophase, the lower the fluidity the smaller the size of the optical texture. Mesophase from lameller molecules is compared with conventional rod-like nematic liquid crystals. Structures in needle-cokes, metallurgical coke, coke from solvent refiend coal and carbon fibre from pitch are discussed in terms of formation and properties of lamellar nematic liquid crystals. 相似文献
18.
Petroleum pitch (Ashland A240) has been subjected to thermal treatment and solvent fractionation to produce refined pitches to be evaluated as impregnants for C-C composites. The solvent fractions were obtained by sequential Soxhlet extraction with solvents such as hexane, benzene, and pyridine. Thermal treatment to 408 °C produced a mesophase pitch (≈50% mesophase); an appreciable portion of the mesophase was soluble in strong solvents. There were substantial differences in chemical composition and in pyrolysis behaviour of the fractions. As the depth of fraction increased, the pyrolysis yield and bloating increased, and the microstructure of the coke became finer until glassy microconstituents were formed in the deepest fractions. 相似文献