乙烯渣油沥青组分的成焦性研究

Investigating the coking performance of ethylene residue pitch components

乙烯渣油沥青作为乙烯渣油中的重质组分具有含碳量高、芳香度较高及杂原子(S、N)含量低的特点,被广泛用作制备石油基人造炭材料的优选原料。为充分研究乙烯渣油沥青的成焦性,本研究选取四种溶剂(甲醇、正丁醇、正庚烷、二甲基亚砜)对乙烯渣油沥青进行萃取分离,获得八种乙烯渣油沥青组分(四种可溶组分和四种不溶组分),并对获得的乙烯渣油沥青组分进行热转化和炭化处理(热转化温度和炭化温度分别为500和1400℃)获得系列乙烯渣油沥青焦。采用红外光谱、热重分析仪、^(1)H-NMR对乙烯渣油沥青组分的基础物性进行研究;利用偏光显微镜、X射线单晶衍射仪、拉曼光谱仪、扫描电子显微镜等对系列石油系沥青焦结构进行研究。结果表明,乙烯渣油沥青不溶组分芳香性略高于可溶组分,且不溶组分支链略少于可溶组分;不溶组分热转化和炭化后得到的乙烯渣油沥青焦显微强度高于可溶组分获得的乙烯渣油沥青焦,且乙烯渣油沥青沥青焦HS-C的真密度高达2.0554 g/cm^(3)。

Ethylene residue pitch(ETP,the heavy component in ethylene residue tar)is widely used as a preferred raw material for preparing petroleum-based artificial carbon materials characterized by high carbon content,high aromaticity,and low heteroatom(S,N)content.To investigate the coking properties of ETP,eight components of ETP(four soluble and four insoluble components)were obtained via extraction and separation using methanol,nbutanol,n-hexane,and dimethyl sulfoxide as solvents.The thermal conversion(temperature=500℃)and carbonization treatment(temperature=1400℃)were carried out on each pitch component.The basic physical properties of ETP components were observed using infrared spectroscopy,thermogravimetric analysis,and ^(1)HNMR.The microstructure of the petroleum-based pitch coke was studied using polarizing microscopy,X-ray single crystal diffraction(XRD),Raman spectroscopy,and scanning electron microscopy.The aromaticity of the insoluble components in ETP was slightly higher than that of soluble components,and the insoluble components had slightly fewer branching chains than those in soluble components.The microstrength of the ETP coke obtained using insoluble components was higher than that obtained using soluble components,and the true density of ETP coke HS-C was as high as 2.0554 g/cm^(3).